W. Hofmann

VHE gamma-rays from Westerlund 2 and implications for the inferred energetics (2007)

Reimer, O., Aharonian, F., Hinton, J., Hofmann, W., Hoppe, S., Raue, M., ...

The H.E.S.S. collaboration recently reported the discovery of VHE γ-ray emission coincident with the young stellar cluster Westerlund 2. This system is known to host a population of hot, massive...

XMM-Newton observations of HESS J1813-178 reveal a composite Supernova remnant (2007)

Funk, S., Hinton, J A., Moriguchi, Y., Aharonian, Felix, Fukui, Y., Hofmann, W., ...

Discovery of VHE $\gamma$-rays from the distant BL Lacertae 1ES 0347-121 (2007)

Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A.R., Behera, B., Beilicke, M., ...

Aims.Our aim is to study the production mechanism for very-high-energy (VHE; >100 GeV) ?-rays in distant active galactic nuclei (AGN) and use the observed VHE spectrum to derive limits on the...

Primary particle acceleration above 100 TeV in the shell-type supernova remnant RX J1713.7-3946 with deep HESS observations (2007)

Berge, D., Aharonian, Felix A., Hofmann, W., Lemoine-Goumard, M., Reimer, O., Rowell, Gavin Peter, ...

The shell-type supernova remnant RX J1713.7--3946 was observed during three years with the H.E.S.S. Cherenkov telescope system. The first observation campaign in 2003 yielded the first-ever resolved...

Primary particle acceleration above 100 TeV in the shell-type supernova remnant RX J1713.7-3946 with deep HESS observations (2007)

Berge, D., Aharonian, Felix A., Hofmann, W., Lemoine-Goumard, M., Reimer, O., Rowell, Gavin Peter, ...

The shell-type supernova remnant RX J1713.7--3946 was observed during three years with the H.E.S.S. Cherenkov telescope system. The first observation campaign in 2003 yielded the first-ever resolved...

H.E.S.S. discovers VHE gamma-rays from the BL Lac RGB J0152+017 (2007)

Nedbal, Dalibor, Benbow, Wystan, Costamante, Luigi, Giebels, Berrie, Kaufmann, Sarah, Raue, Martin, ...

We report on the H.E.S.S. discovery of VHE gamma-rays from the BL Lac object RGB J0152+017. H.E.S.S. observed the source from Oct 30 to Nov 14, 2007 for a total of ~14h live time. A preliminary...

MODELING LUNG CANCER INCIDENCE IN RATS FOLLOWING EXPOSURE TO RADON PROGENY (2007)

Hofmann, W., Crawford-Brown, D. J., Fakir, H., Monchaux, G.

Lung cancer incidence in Sprague-Dawley rats was simulated by a biologically based carcinogenesis model, which is formulated mathematically in terms of a stochastic state-vector model. Doses to the...

XMM-Newton observations of HESS J1813-178 reveal a composite Supernova remnant (2006)

Funk, S., Hinton, J. A., Moriguchi, Y., Aharonian, F. A., Fukui, Y., Hofmann, W., ...

We present X-ray and 12CO(J=1-0) observations of the very-high-energy (VHE) gamma-ray source HESS J1813-178 with the aim of understanding the origin of the gamma-ray emission. Using this dataset we...

Energy dependent $\gamma$-ray morphology in the pulsar wind nebula HESS J1825-137 (2006)

Aharonian, F., Akhperjanian, A.G., Bazer-Bachi, A.R., Beilicke, M., Benbow, W., Berge, D., ...

Aims. We present results from deep $\gamma$-ray observations of the Galactic pulsar wind nebula HESS J1825-137 performed with the HESS array. Methods. Detailed morphological and spatially resolved...

The H.E.S.S. survey of the Inner Galaxy in very-high-energy gamma-rays (2006)

Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...

We report on a survey of the inner part of the Galactic Plane in very high energy gamma-rays, with the H.E.S.S. Cherenkov telescope system. The Galactic Plane between +-30deg in longitude and +-3deg...

Discovery of very-high-energy gamma-rays from the Galactic Centre ridge (2006)

Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...

The source of Galactic cosmic rays (with energies up to 1015 eV) remains unclear, although it is widely believed that they originate in the shock waves of expanding supernova remnants1, 2. At present...

Evidence for VHE gamma-ray emission from the distant BL Lac PG 1553+113 (2006)

Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...

The high-frequency peaked BL Lac PG 1553+113 was observed in 2005 with the HESS stereoscopic array of imaging atmospheric-Cherenkov telescopes in Namibia. Using the HESS standard analysis, an excess...

First detection of a VHE gamma-ray spectral maximum from a Cosmic source: H.E.S.S. discovery of the Vela X nebula (2006)

Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...

The Vela supernova remnant (SNR) is a complex region containing a number of sources of non-thermal radiation. The inner section of this SNR, within 2 degrees of the pulsar PSR B0833-45, has been...

A detailed spectral and morphological study of the gamma-ray supernova remnant RX J1713.7-3946 with HESS (2006)

Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...

We present results from deep observations of the Galactic shell-type supernova remnant (SNR) RX J1713.7-3946 (also known as G347.3-0.5 ) conducted with the complete HESS array in 2004....

A low level of extragalactic background light as revealed by gamma-rays from blazars (2006)

Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...

The diffuse extragalactic background light consists of the sum of the starlight emitted by galaxies through the history of the Universe, and it could also have an important contribution from the...

Discovery of the two wings of the Kookaburra complex in VHE gamma-rays with H.E.S.S (2006)

Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...

Aims. Search for Very High Energy gamma-ray emission in the Kookaburra complex through observations with the H.E.S.S. array. Methods. Stereoscopic imaging of Cherenkov light emission of the gamma-ray...

Polarization of Λ and Λ overbar in 920 GeV fixed-target proton–nucleus collisions (2006)

Abt, I., Adams, M., Albrecht, H., Amaral, V., Amorim, A., ...

A measurement of the polarization of Λ and baryons produced in pC and pW collisions at has been performed with the HERA-B spectrometer. The measurements cover the kinematic range of 0.6 GeV/c

Measurement of the Υ production cross section in 920 GeV fixed-target proton–nucleus collisions (2006)

Abt, I., Adams, M., Albrecht, H., Amaral, V., Amorim, A., ...

The cross section ratio RJ/ψ=Br(Υ→l+l−)dσ(Υ)/dy|y=0/σ(J/ψ) has been measured with the HERA-B spectrometer in fixed-target proton–nucleus collisions at 920 GeV proton beam energy...

Improved measurement of the b[overline b] production cross section in 920 GeV fixed-target proton-nucleus collisionsnd in 920 GeV fixed-target proton–nucleus collisions (2006)

Abt, I., Adams, M., Albrecht, H., Amaral, V., Amorim, A., ...

A new measurement of the b[overline b] production cross section in 920 GeV proton-nucleus collisions is presented by the HERA-B Collaboration. The b[overline b] production is tagged via inclusive...

Observations of the Crab nebula with HESS (2006)

Aharonian, Felix, Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, Wystan, ...

Context.The Crab nebula was observed with the HESS stereoscopic Cherenkov-telescope array between October 2003 and January 2005 for a total of 22.9 h (after data quality selection). This period of...

Fast Variability of Tera–Electron Volt gamma Rays from the Radio Galaxy M87 (2006)

Aharonian, Felix, Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, Wystan, ...

The detection of fast variations of the tera–electron volt (TeV) (1012 eV) gamma-ray flux, on time scales of days, from the nearby radio galaxy M87 is reported. These variations are about 10 times...

HESS Observations of the Galactic Center Region and Their Possible Dark Matter Interpretation (2006)

Aharonian, Felix, Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, Wystan, ...

The detection of gamma rays from the source HESS J1745-290 in the Galactic Center (GC) region with the High Energy Spectroscopic System (HESS) array of Cherenkov telescopes in 2004 is presented....

Energy dependent gamma-ray morphology in the Pulsar wind nebula HESS J1825-137 (2006)

Aharonian, Felix, Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, Wystan, ...

Detailed morphological and spatially resolved spectral studies reveal the very high-energy (VHE) gamma-ray aspects of this object with unprecedented precision. We confirm previous results obtained in...

Observations of 14 young open star clusters with the HEGRA system of Cherenkov telescopes (2006)

Aharonian, F., Akhperjanian, A., Beilicke, M., Bernlöhr, K., Bojahr, H., ...

Energy dependent $\gamma$-ray morphology in the pulsar wind nebula HESS J1825-137 (2006)

Aharonian, F., Akhperjanian, A.G., Bazer-Bachi, A.R., Beilicke, M., Benbow, W., Berge, D., ...

Aims. We present results from deep $\gamma$-ray observations of the Galactic pulsar wind nebula HESS J1825-137 performed with the HESS array. Methods. Detailed morphological and spatially resolved...

Energy dependent $\gamma$-ray morphology in the pulsar wind nebula HESS J1825-137 (2006)

Aharonian, F., Akhperjanian, A.G., Bazer-Bachi, A.R., Beilicke, M., Benbow, W., Berge, D., ...

Aims. We present results from deep $\gamma$-ray observations of the Galactic pulsar wind nebula HESS J1825-137 performed with the HESS array. Methods. Detailed morphological and spatially resolved...

Observations of the Crab nebula with HESS Astronomy Astrophysics (2006)

F. Aharonian, A. G. Akhperjanian, M. Beilicke, W. Benbow, D. Berge, ...

Context. The Crab nebula was observed with the HESS stereoscopic Cherenkov-telescope array between October 2003 and January 2005 for a total of 22.9 h (after data quality selection). This period of...

Modelling the effect of non-uniform radon progeny activities on transformation frequencies in human bronchial airways (2006)

Fakir, H., Hofmann, W., Aubineau-Laniece, I.

The effects of radiological and morphological source heterogeneities in straight and Y-shaped bronchial airways on hit frequencies and microdosimetric quantities in epithelial cells have been...

MODELLING THE EFFECT OF NON-UNIFORM RADON PROGENY ACTIVITIES ON TRANSFORMATION FREQUENCIES IN HUMAN BRONCHIAL AIRWAYS (2006)

Fakir, H., Hofmann, W., Aubineau-Laniece, I.

The effects of radiological and morphological source heterogeneities in straight and Y-shaped bronchial airways on hit frequencies and microdosimetric quantities in epithelial cells have been...

A MODEL FOR THE INDUCTION OF CHROMOSOME ABERRATIONS THROUGH DIRECT AND BYSTANDER MECHANISMS (2006)

Schöllnberger, H., Mitchel, R. E. J., Crawford-Brown, D. J., Hofmann, W.

A state vector model (SVM) for chromosome aberrations and neoplastic transformation has been adapted to describe detrimental bystander effects. The model describes initiation (formation of...

INCORPORATION OF MICRODOSIMETRIC CONCEPTS INTO A BIOLOGICALLY-BASED MODEL OF RADIATION CARCINOGENESIS (2006)

Fakir, H., Hofmann, W.

The generalised state-vector model of radiation carcinogenesis (SVM) simulates radiation induced biological effects by expressing the transition rates between the various initiation and promotion...

A multi-compartment model for slow bronchial clearance of insoluble particles--extension of the ICRP human respiratory tract models (2006)

Exposure Assessment of Diesel Bus Emissions (2006)

To incorporate the various mechanisms that are presently assumed to be responsible for the experimentally observed slow bronchial clearance into the HRTM, a multi-compartment model was developed to...

Yip, M, Madl, P, Wiegand, A, Hofmann, W

Production of the LHCb Silicon Tracker Readout Electronics (2005)

Vollhardt, Achim, Bay, A, Carron, B, Fauland, P, Frei, R, Jiménez-Otero, S, ...

We give an overview on the status of production of the LHCb Silicon Tracker Electronics. Lessons learned together with industry in the preseries production of the Silicon Tracker Digitizer Boards...

LHCb Computing Technical Design Report (2005)

Antunes Nobrega, R., Franca Barbosa, A., Bediaga, I., Cernicchiaro, G., Magnin, J., ...

A New Population of Very High Energy Gamma-Ray Sources in the Milky Way (2005)

Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...

Very high energy -rays probe the long-standing mystery of the origin of cosmic rays. Produced in the interactions of accelerated particles in astrophysical objects, they can be used to image cosmic...

Discovery of VHE gamma ray from PKS 2005-489 (2005)

Aharonian, Felix, Akhperjanian, A.G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...

The high-frequency peaked BL Lac PKS 2005-489 (z=0.071) was observed in 2003 and 2004 with the HESS stereoscopic array of imaging atmospheric-Cherenkov telescopes in Namibia. A signal was detected at...

H.E.S.S. Observations of PKS 2155-304 (2005)

Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...

The high-frequency peaked BL Lac PKS 2155-304 at redshift z=0.117 has been detected with high significance (~45 ) at energies greater than 160 GeV, using the H.E.S.S. stereoscopic array of imaging...

The unidentified TeV source (TeV J2032+4130) and surrounding field: Final HEGRA IACT-Syste (2005)

Aharonian, Felix, Akhperjanian, A., Beilicke, M., Bernlöhr, K., Bojahr, H., ...

The unidentified TeV source in Cygnus is now confirmed by follow-up observations from 2002 with the HEGRA stereoscopic system of Cherenkov Telescopes. Using all data (1999 to 2002) we confirm this...

Search for TeV emission from the region around PSR B1706-44 with the H.E.S.S. experiment (2005)

Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...

The region around PSR B1706-44 has been observed with the HESS imaging atmospheric Cherenkov telescopes in 2003. No evidence for gamma-ray emission in the TeV range was found at the pulsar position...

Discovery of extended VHE gamma-ray emission from the asymmetric pulsar wind nebula in MSH 15-52 with H.E.S.S. (2005)

Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...

The Supernova Remnant MSH 15-52 has been observed in very high energy (VHE) gamma-rays using the HESS 4-telescope array located in Namibia. A gamma-ray signal is detected at the 25 sigma level during...

Detection of TeV gamma-ray emission from the Shell-Type Supernova Remnant RX J0852.0-4622 with H.E.S.S. (2005)

Aharonian, F., Akhperjanian, A. G., Borrel, V., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...

We report the detection of TeV -rays from the shell-type supernova remnant RX J0852.0-4622 with data of 3.2 h of live time recorded with HESS in February 2004. An excess of (700 ± 60) events from...

Observations of Mkn 421 in 2004 with HESS at large zenith angles (2005)

Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...

Mkn 421 was observed during a high flux state for nine nights in April and May 2004 with the fully operational High Energy Stereoscopic System (HESS) in Namibia. The observations were carried out at...

Upper limits to the SN1006 multi-TeV gamma-ray flux from H.E.S.S. observations (2005)

Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...

Observations of the shell-type supernova remnant SN1006 have been carried out with the HESS system of Cherenkov telescopes during 2003 (18.2 h with two operating telescopes) and 2004 (6.3 h with all...

Discovery of the Binary Pulsar PSR B1259-63 in Very-High-Energy Gamma Rays around Periastron with H.E.S.S (2005)

Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., ...

We report the discovery of very-high-energy (VHE) gamma-ray emission of the binary system PSR B1259-63/SS 2883 of a radio pulsar orbiting a massive, luminous Be star in a highly eccentric orbit. The...

Discovery of Very High Energy Gamma Rays Associated with an X-ray Binary (2005)

Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...

X-ray binaries are composed of a normal star in orbit around a neutron star or stellar-mass black hole. Radio and x-ray observations have led to the presumption that some x-ray binaries called...

A possible association of the new VHE gamma-ray source HESS J1825-137 with the pulsar wind nebula G 18.0-0.7 (2005)

Aharonian, F., Akhperjanian, A. G., Bazer-Bachi, A. R., Beilicke, M., Benbow, W., Berge, D., ...

We report on a possible association of the recently discovered very high-energy gamma-ray source HESS J1825--137 with the pulsar wind nebula (commonly referred to as G 18.0--0.7) of the 2.1 x 104...

TeV gamma-ray observations of SS-433 and a survey of the surrounding field with the HEGRA IACT-System (2005)

Aharonian, Felix, Akhperjanian, A., Beilicke, M., Bernlöhr, K., Bojahr, H., ...

We present results of a search for TeV -ray emission from the microquasar SS-433 and the surrounding region covering a ~ 8°x8° field of view. Analysis of data taken with the HEGRA stereoscopic...

LHCb Computing Technical Design Report (2005)

Antunes Nobrega, R., Franca Barbosa, A., Bediaga, I., Cernicchiaro, G., Magnin, J., ...

LHCb Computing Technical Design Report (2005)

Antunes Nobrega, R., Franca Barbosa, A., Bediaga, I., Cernicchiaro, G., Magnin, J., ...

MICRODOSIMETRY OF INHOMOGENEOUS RADON PROGENY DISTRIBUTIONS IN BRONCHIAL AIRWAYS (2005)

Fakir, H., Hofmann, W., Caswell, R. S., Aubineau-Lanièce, I.

A Monte Carlo code, initially developed for the calculation of microdosimetric spectra for alpha particles in cylindrical airways, has been extended to allow the computation (i) of additional...

MICRODOSIMETRY OF RADON PROGENY ALPHA PARTICLES IN BRONCHIAL AIRWAY BIFURCATIONS (2005)

Fakir, H., Hofmann, W., Aubineau-Lanièce, I.

A Monte Carlo code, initially developed for the calculation of microdosimetric spectra for alpha particles in cylindrical airways, has been extended to allow the computation of microdosimetric...

A MULTI-COMPARTMENT MODEL FOR SLOW BRONCHIAL CLEARANCE OF INSOLUBLE PARTICLES--EXTENSION OF THE ICRP HUMAN RESPIRATORY TRACT MODELS (2005)

Microdosimetry of inhomogeneous radon progeny distributions in bronchial airways (2005)

To incorporate the various mechanisms that are presently assumed to be responsible for the experimentally observed slow bronchial clearance into the HRTM, a multi-compartment model was developed to...

Fakir, H., Hofmann, W., Caswell, R. S., AubineauLanièce, I.

A Monte Carlo code, initially developed for the calculation of microdosimetric spectra for alpha particles in cylindrical airways, has been extended to allow the computation (i) of additional...

MICRODOSIMETRY OF INHOMOGENEOUS RADON PROGENY DISTRIBUTIONS IN BRONCHIAL AIRWAYS (2005)

Fakir, H., Hofmann, W., Caswell, R. S., Aubineau-Lanièce, I.

A Monte Carlo code, initially developed for the calculation of microdosimetric spectra for alpha particles in cylindrical airways, has been extended to allow the computation (i) of additional...

MICRODOSIMETRY OF RADON PROGENY ALPHA PARTICLES IN BRONCHIAL AIRWAY BIFURCATIONS (2005)

Fakir, H., Hofmann, W., Aubineau-Lanièce, I.

A Monte Carlo code, initially developed for the calculation of microdosimetric spectra for alpha particles in cylindrical airways, has been extended to allow the computation of microdosimetric...

A MULTI-COMPARTMENT MODEL FOR SLOW BRONCHIAL CLEARANCE OF INSOLUBLE PARTICLES--EXTENSION OF THE ICRP HUMAN RESPIRATORY TRACT MODELS (2005)

White paper report on using nuclear reactors to search for a value of theta13 (2004)

To incorporate the various mechanisms that are presently assumed to be responsible for the experimentally observed slow bronchial clearance into the HRTM, a multi-compartment model was developed to...

Anderson, K., Anjos, J.C., Ayres, D., Beacom, J., Bediaga, I., De Bellefon, A., ...

Study of double Pomeron exchange in pp collisions at $\sqrt{s}=31 GeV$ (2004)

Della Negra, Michel, Drijard, Daniel, Fischer, H G, Fontaine, G, Frehse, H, Frenkiel, P, ...

General characteristics of events with a particle of large transverse momentum in pp collisions at S = 52.5 GeV (2004)

Della Negra, Michel, Drijard, Daniel, Fischer, H G, Fontaine, G, Frehse, H, Frenkiel, P, ...

Study of jet structure in proton-proton collisions with large transverse momentum secondaries (2004)

Della Negra, Michel, Drijard, Daniel, Fischer, H G, Fontaine, G, Frenkiel, P, Ghesquière, C, ...

Verfahren und Werkzeug zur Herstellung transparenter optischer Elemente aus polymeren Werkstoffen (2004)

Schulz, U., Munzert, P., Kaiser, N., Hofmann, W., Bitzer, M., Gebhardt, M.

WO2004092789 A UPAB: 20041125 NOVELTY - Production of transparent polymeric optical elements with reduced boundary surface reflectivity comprises exposure to energetic ions in a vacuum to form an...

Search for the flavor-changing neutral current decay D0→μ0+μ- with the HERA-B detector (2004)

Abt, I., Adams, M., Albrecht, H., Amaral, V., Amorim, A., ...

We report on a search for the flavor-changing neutral current decay D0→μ+μ- using 50×106 events recorded with a dimuon trigger in interactions of 920 GeV protons with nuclei by the HERA-B...

Interaction of alpha particles at the cellular level--implications for the radiation weighting factor (2004)

Hofmann, W., Fakir, H., Aubineau-Laniece, I., Pihet, P.

Since low dose effects of alpha particles are produced by cellular hits in a relatively small fraction of exposed cells, the present study focuses on alpha particle interactions in bronchial...

LHCb reoptimized detector design and performance : Technical Design Report (2003)

Antunes Nobrega, R., Franca Barbosa, A., Bediaga, I., Cernicchiaro, G., Correade Oliveira, E., Magnin, J., ...

LHCb Trigger System : Technical Design Report (2003)

Antunes Nobrega, R., Franca Barbosa, A., Bediaga, I., Cernicchiaro, G., Correade Oliveira, E., Magnin, J., ...

TeV gamma-ray light curve and energy spectrum of Mkn421 during its 2001 flare as measured with HEGRA CT1 (2003)

Aharonian, F., Akhperjanian, A., Beilicke, M., Bernlöhr, K., Börst, H. G., Bojahr, H., ...

In the first month of 2001 the AGN Mkn 421 showed highly variable, strong TeV activity at flux levels frequently exceeding 1 Crab. Here we present the light curve and energy spectrum of Mkn 421 as...

J/ψ production via χc decays in 920 GeV pA interactions (2003)

Abt, I., Adams, M., Albrecht, H., Amaral, V., Amorim, A., ...

Using data collected by the HERA-B experiment, we have measured the fraction of J/ψ's produced via radiative χc decays in interactions of 920 GeV protons with carbon and titanium targets. We...

Detection of TeV gamma-rays from the BL Lac 1ES 1959+650 in its low states and during a major outburst in 2002 (2003)

Aharonian, Felix A., Akhperjanian, A., Beilicke, M., Bernlohr, K., Borst, H., Bojahr, H., ...

Is the giant radio galaxy M 87 a TeV gamma-ray emitter? (2003)

Aharonian, Felix A., Akhperjanian, A., Beilicke, M., Bernlohr, K., Borst, H., Bojahr, H., ...

LHCb Trigger System : Technical Design Report (2003)

Antunes Nobrega, R., Franca Barbosa, A., Bediaga, I., Cernicchiaro, G., Correade Oliveira, E., Magnin, J., ...

LHCb reoptimized detector design and performance : Technical Design Report (2003)

Antunes Nobrega, R., Franca Barbosa, A., Bediaga, I., Cernicchiaro, G., Correade Oliveira, E., Magnin, J., ...

Detection of TeV gamma-rays from the BL Lac 1ES 1959+650 in its low states and during a major outburst in 2002 (2003)

Aharonian, Felix A., Akhperjanian, A., Beilicke, M., Bernlohr, K., Borst, H., Bojahr, H., ...

Is the giant radio galaxy M 87 a TeV gamma-ray emitter? (2003)

Aharonian, Felix A., Akhperjanian, A., Beilicke, M., Bernlohr, K., Borst, H., Bojahr, H., ...

LHCb Trigger System : Technical Design Report (2003)

Antunes Nobrega, R., Franca Barbosa, A., Bediaga, I., Cernicchiaro, G., Correade Oliveira, E., Magnin, J., ...

LHCb reoptimized detector design and performance : Technical Design Report (2003)

Antunes Nobrega, R., Franca Barbosa, A., Bediaga, I., Cernicchiaro, G., Correade Oliveira, E., Magnin, J., ...

Mechanistic interpretation of the slow bronchial clearance phase (2003)

Simulation of deposition and clearance of inhaled particles in central human airways (2003)

A slow bronchial clearance phase, describing the removal of insoluble particles from the sol layer has recently been incorporated into the ICRP human respiratory tract model. A striking feature of...

Balásházy, I., Farkas, Á., Szöke, I., Hofmann, W., Sturm, R.

In this study local distributions of deposited inhaled particles such as radon progenies in realistic human airway bifurcation models of bronchial generations one to six are computed for different...

Stochastic model of ultrafine particle deposition and clearance in the human respiratory tract (2003)

Hofmann, W., Sturm, R., Winkler-Heil, R., Pawlak, E.

Deposition and clearance of insoluble ultrafine particles, ranging from 1 to 100 nm, were simulated by stochastic models using Monte Carlo methods. Brownian motion is the dominant mode of deposition...

Monte Carlo studies on the sensitivity of the HEGRA imaging atmospheric Cerenkov telescope system in observations of extended gamma-ray sources (2002)

Konopelko, A., Lucarelli, F., Lampeitl, H., Hofmann, W.

In this paper, we present the results of Monte Carlo simulations of atmospheric showers induced by diffuse gamma rays as detected by the high-energy gamma ray astronomy (HEGRA) system of five imaging...

An unidentified TeV source in the vicinity of Cygnus OB2 (2002)

Aharonian, Felix A., Akhperjanian, A., Beilicke, M., Bernlohr, K., Borst, H., Bojahr, H., ...

TeV gamma rays from the blazar H 1426+428 and the diffuse extragalactic background radiation (2002)

Aharonian, Felix A., Akhperjanian, A., Barrio, J. A., Beilicke, M., Bernlohr, K., Borst, H., ...

An unidentified TeV source in the vicinity of Cygnus OB2 (2002)

Aharonian, Felix A., Akhperjanian, A., Beilicke, M., Bernlohr, K., Borst, H., Bojahr, H., ...

TeV gamma rays from the blazar H 1426+428 and the diffuse extragalactic background radiation (2002)

Aharonian, Felix A., Akhperjanian, A., Barrio, J. A., Beilicke, M., Bernlohr, K., Borst, H., ...

Energy Deposition, Cellular Radiation Effects and Lung Cancer Risk by Radon Progeny Alpha Particles (2002)

Hofmann, W., Fakir, H., S. Caswell, R.

Slowing down spectra, LET spectra, hit probabilities, and radiation doses were simulated for the interaction of single 218Po and 214Po alpha particles with sensitive basal and secretory cell nuclei...

Monte Carlo Code for Microdosimetry of Inhaled a Emitters (2002)

Aubineau-Laniece, I., Pihet, P., Winkler, R., Hofmann, W., E. Charlton, D.

A Monte Carlo code has been developed to calculate the local energy deposited on the inner surface in the lung airway. Developed to deal further with airway bifurcations, this code has been as a...

Local Deposition Distributions of Inhaled Radionuclides in the Human Tracheobronchial Tree (2002)

Balásházy, I., Farkas, A., Hofmann, W., Kurunczi, S.

There is experimental evidence that bronchogenic carcinomas originate mainly at the carinal ridges of the large central airways, where primary hot spots of deposition have been found. However,...

Comparison of Mucociliary Clearance Velocities in Human and Rat Lungs for Extrapolation Modeling (2002)

Hofmann, W., Asgharian, B.

Mucociliary clearance velocities in bronchial airway generations were calculated in asymmetric multiple-path models of the bronchial tree by solving mass transport equations based on the assumption...

Deposition Densities of Inhaled Particles in Human Bronchial Airways (2002)

Winkler-Heil, R., Hofmann, W.

Deposition fractions in bronchial airway generations were computed with a stochastic deposition model that provides information on average deposition fractions and bronchial surface areas and their...

Particle Clearance in Human Bronchial Airways: Comparison of Stochastic Model Predictions with Experimental Data (2002)

Sturm, R., Hofmann, W., Scheuch, G., Sommerer, K., Camner, P., Svartengren, M.

A stochastic bronchial clearance model has been developed that is based on a probabilistic asymmetric structure of the human lung. This model takes mucociliary transport rates to be a function of...

Numerical Modeling of Deposition of Inhaled Particles in Central Human Airways (2002)

Balásházy, I., Hofmann, W., Farkas, Á.

The objective of our research is to model physical and biological processes related to the development of adverse health effects, especially initiation of lung cancer in the central human airways...

The size of the emission region of VHE gamma rays in the Crab Nebula, these proceedings (2001)

W. Hofmann, G. Pühlhofer

Abstract. The HEGRA system of imaging atmospheric Cherenkov telescopes provides for specially selected classes of events an angular resolution of better than 3’. By comparing the measured angular...

Environmental Tobacco Smoke Deposition in the Human Respiratory Tract: Differences Between Experimental and Theoretical Approaches (2001)

Environmental Tobacco Smoke Deposition in the Human Respiratory Tract: Differences Between Experimental and Theoretical Approaches (2001)

Environmental Tobacco Smoke Deposition in the Human Respiratory Tract: Differences Between Experimental and Theoretical Approaches (2001)

Environmental Tobacco Smoke Deposition in the Human Respiratory Tract: Differences Between Experimental and Theoretical Approaches (2001)

Optisch aktives Element und Verfahren zu seiner Herstellung (2000)

Jaenchen, H., Hofmann, W., Gombert, A., Wittwer, V.

WO 9950691 A UPAB: 19991201 NOVELTY - The optically active element, of a plastics material transparent to electromagnetic waves, has a microstructure formed at least partially and directly on the...

R. M. Sambruna, F. A. Aharonian, H. Krawczynski, A. G. Akhperjanian, J. A. Barrio, K. Bernlo Hr, ...

We present exactly simultaneous X-ray and TeV monitoring with RXT E and HEGRA of the TeV blazar Mrk 501 during 15 days in 1998 June. After an initial period of very low ux at both wavelengths, the...

Effectiveness of TeV Gamma-Ray Observations at Large Zenith Angles with a Stereoscopic System of Imaging Atmospheric Cherenkov Telescopes (1999)

Konopelko, A., Aharonian, F., Hemberger, M., Hofmann, W., Kettler, J., Puehlhofer, G., ...

The sensitivity of imaging atmospheric Cherenkov telescopes (IACTs) in TeV gamma-ray observations reachs its maximum at small zenith angles (< 30 degree) which provide the minimum attainable energy...

The Cosmic-Ray Proton Spectrum as measured with the HEGRA System of Imaging Atmospheric Cerenkov Telescopes (1999)

Hemberger Aharonian Hofmann, M. Hemberger, F. Aharonian, W. Hofmann, A. Konopelko, H. Krawczynski, ...

The HEGRA collaboration operates a stereoscopic system of 5 imaging atmospheric Cerenkov telescopes (IACT) at La Palma (Canary Islands). This instrument has been used to measure the spectrum of the...

Overview of Radon Lung Dosimetry (1998)

Thoron Exposure of Man: A Negligible Issue? (1994)

It is widely held that the probability of lung cancer induction following inhalation exposure to ambient radon progeny depends on the cellular dose to sensitive target cells in the bronchial...

Steinhäusler, F., Hofmann, W., Lettner, H.

The existing database on thoron (Tn) in the environment, the experimental validation of dosimetric models and potential health effects are scarce. Available information on Tn and its decay products...

Lung Cancer Risk at Low Doses: What Can Cellular Radiobiology Tell Us? (1994)

Microdosimetry and Cellular Radiation Effects of Radon Progeny in Human Bronchial Airways (1994)

The inevitable interaction of confounding factors limits the validity of any epidemiological estimate of lung cancer risk at low, environmental exposures to radon progeny. The present study therefore...

Hofmann, W., Nösterer, M., Ménache, M.G., Crawford-Brown, D.J., Caswell, R.S., Coyne, J.J.

This microdosimetric interaction model simulates individual interactions of alpha particles with nuclei of sensitive target cells in human bronchial airway generations 2, 4, 6 and 10. For a...

HELENA: a beauty factory in Hamburg (1992)

Albrecht, H, Böhm, G, Ehrlichmann, H, Michel, E, Nowak, H, Nowak, S, ...

Development and test of a large silicon strip system for a hadron collider beauty trigger (1992)

Ellett, J, Erhan, S, Kreuzer, P K, Lynn, D, Medinnis, M, Schlein, Peter E, ...

Expert systems application to power systems. State of the art and future trends (1992)

Bretthauer, G., Handschin, E., Hofmann, W.

A Dose Rate Model Predicting Radon-Induced Lung Cancer Risk in Rats (1992)

Hofmann, W., Lettner, H., Crawford-Brown, D.J.

The laboratory rat has been used in inhalation studies as a surrogate to estimate human lung cancer risk following exposure to ambient radon progeny. Deposition, mucociliary clearance and dosimetry...

Microdosimetry of Inhaled Radon Progeny (1992)

Hofmann, W., Ménache, M.G., Crawford-Brown, D.J.

This microdosimetric interaction model simulates individual intersections of alpha particles, emitted from human airway surfaces, with nuclei of sensitive target cells in the bronchial epithelium....

A Unified Theory of the Effect of Age on the Biokinetics, Dosimetry and Radiobiology of Alpha-Emitting Radionuclides in the Human Body (1992)

Crawford-Brown, D.J., Hofmann, W.

A biophysical theory of the process of radiation carcinogenesis is developed from an axiomatic base utilising the concepts of cellular mitosis, inactivation, removal and transitions within a...

Particle Deposition Patterns Within Airway Bifurcations - Solution of the 3D Navier-Stokes Equation (1991)

Hofmann, W., Balásházy, I.

Analytical solutions of the equations of particle motion in a human airway bifurcation require the assumptions of an idealised geometry and idealised flow conditions. Here, we calculate the actual...

Dosimetry of Localised Accumulations of Cigarette Smoke and Radon Progeny at Bifurcations (1991)

Martonen, T.B., Hofmann, W.

Inhalation risk assessment protocols are frequently based upon assumptions of uniform particle deposition patterns and homogeneous clearance processes within human lung airways. However, experiments...

Carcinogenic Risk of Non-Uniform Alpha Particle Irradiation in the Lungs: Radon Progeny Effects at Bronchial Bifurcations (1991)

Hofmann, W., Crawford-Brown, D.J., Ménache, M.G., Martonen, T.B.

The combined effect of enhanced deposition and reduced clearance at bronchial bifurcations leads to increased radon progeny doses within branching sites compared with uniformly distributed activity...

The four-jet structure of large transverse momentum events in pp interactions at the ISR (1990)

Breakstone, A, Buchanan, C D, Crawley, H B, Doroba, K, Drijard, Daniel, Fabbri, Franco Luigi, ...

Associated pi0 production in events with a particle of high transverse momentum at \Sqrt s = 63 GeV (1990)

Doroba, K, Drijard, Daniel, Fischer, H G, Frehse, H, Geist, Walter M, Gokieli, R, ...

Density, charge and transverse momentum correlations of particles in non-diffractive proton-proton collisions at \Sqrt s = 52.5 GeV (1990)

Drijard, Daniel, Fischer, H G, Gokieli, R, Innocenti, Pier Giorgio, Korbel, V, Minten, Adolf G, ...

Charmed baryon production at the CERN Intersecting Storage Rings (1990)

Drijard, Daniel, Fischer, H G, Geist, Walter M, Innocenti, Pier Giorgio, Korbel, V, Minten, Adolf G, ...

Comparison of short-range rapidity correlations in $\overline{p}$p and pp interactions at \Sqrt s = 53 GeV (1990)

Breakstone, A, Crawley, H B, Firestone, A, Gorbics, M, Lamsa, J, Meyer, W T, ...

Confirmation of a negative result from a search for beauty at the ISR (1990)

Drijard, Daniel, Fischer, H G, Frehse, H, Geist, Walter M, Innocenti, Pier Giorgio, Lamsa, J, ...

Fluctuations in the hadronic temperature in pp, p.alpha and alpha.alpha collisions at ISR energies (1990)

Braune, K, Breakstone, A, Campanini, R, Claesson, G, Crawley, H B, Dallavalle, G M, ...

Observation of charmed D meson production in pp collisions (1990)

Drijard, Daniel, Fischer, H G, Geist, Walter M, Gokieli, R, Innocenti, Pier Giorgio, Korbel, V, ...

Quantum number effects in events with a charged particle of large transverse momentum ; 2, charge correlations in jets (1990)

Drijard, Daniel, Fischer, H G, Geist, Walter M, Innocenti, Pier Giorgio, Korbel, V, Minten, Adolf G, ...

Production of vector and tensor mesons in proton-proton collisions at \Sqrt s = 52.5 GeV (1990)

Drijard, Daniel, Fischer, H G, Geist, Walter M, Innocenti, Pier Giorgio, Korbel, V, Minten, Adolf G, ...

Neutral strange particle production in proton-proton collisions at \Sqrt s = 63 GeV (1990)

Drijard, Daniel, Fischer, H G, Frehse, H, Hanke, P, Innocenti, Pier Giorgio, Lamsa, J, ...

Double pomeron exchange in the reaction pp --> pppi$^{+}$pi$^{-}$ at ISR energies (1990)

Drijard, Daniel, Fischer, H G, Gokieli, R, Innocenti, Pier Giorgio, Korbel, V, Minten, Adolf G, ...

Experimental study of parton-parton scattering amplitudes: the spin of the gluon (1990)

Drijard, Daniel, Fischer, H G, Frehse, H, Geist, Walter M, Heiden, M, Innocenti, Pier Giorgio, ...

Study of hadronic events in pp collisions at \Sqrt s = 62 GeV and comparison with hadronic events in e+e- collisions (1990)

Breakstone, A, Crawley, H B, Firestone, A, Gorbics, M, Lamsa, J, Meyer, W T, ...

Further investigation of beauty baryon production at the ISR (1990)

Drijard, Daniel, Fischer, H G, Frehse, H, Geist, Walter M, Innocenti, Pier Giorgio, Lamsa, J, ...

A measurement of the inclusive cross section of charged pions at very high transverse momenta (1990)

Drijard, Daniel, Fischer, H G, Frehse, H, Geist, Walter M, Heck, B, Heiden, M, ...

A Dosimetric Model for Localised Radon Progeny Accumulations at Tracheobronchial Bifurcations (1990)

Hofmann, W., Martonen, T.B., Ménache, M.G.

The prevalent philosophy of inhalation risk assessment protocols is based upon assumptions of uniform particle deposition patterns and homogeneous clearance processes within human lung airways. Here...

Spatial Distribution Patterns of Energy Deposition and Cellular Radiation Effects in Lung Tissue Following Simulated Exposure to Alpha Particles (1990)

Hofmann, W., Nösterer, M., Crawford-Brown, D.J., Hutticher, A.

Randomly oriented sections of rat tissue have been digitised to provide the contours of tissue-air interfaces and the locations of individual cell nuclei in the alveolated region of the lung. Sources...

The Role of Variability of Dose in Dose-Response Relationships for Alpha Emitting Radionuclides (1989)

Crawford-Brown, D.J., Hofmann, W.

Radiation protection requires predictions of the effects of radiation at low mean organ doses. Since epidemiological data are restricted to moderate to high doses, extrapolation functions must be...

Bronchial Deposition of Inhaled Particles: Dosimetry Implications for Radon Progeny (1987)

Hofmann, W., Martonen, T.B.

Inconsistencies exist between experimental inhalation exposure data and theoretical models predicting tracheobronchial aerosol deposition in human subjects. The relevance of these anomalies affecting...

Factors to be Considered in a Dosimetry Model for Risk Assessment of Inhaled Particles (1986)

Martonen, T., Hofmann, W.

Clinical findings suggest that bronchogenic tumours have a predilection for certain airway locations in man. Aerosol deposition studies with laryngeal-tracheobronchial casts and models indicate that...

Biological Effects of Alpha Particles in Lung Tissue (1985)

Hofmann, W., Daschil, F.

Allowing for concomitant cellular inactivation, the tumour incidence function can be written as the product of two probabilities, for malignant transformation and for not being killed. While cell...

Lung Cancer Induction by Inhaled Radon Daughters - What is the Relevant Dose? (1984)

Phototransferred Thermoluminescence in LiF for High LET Radiation Dosimetry (1984)

Current concepts of lung dosimetry consider the basal cells of the bronchial epithelium as the sensitive target for lung cancer induction. Since basal cell depths are highly variable, radiation doses...

Hofmann, W., Lakshmanan, A.R., Spallek, R.

The phototransferred thermoluminescence (PTTL) efficiency in 7LiF increases with the LET of the radiation, in the same way as the ratio of peak 7 to peak 5 TL but to a lesser extent. Unlike the ratio...

Heavy Particle Dosimetry with High Temperature Peaks of CaF2:Tm and 7LiF Phosphors (1983)

Hofmann, W., Prediger, B.

The LET dependence of low and high temperature peaks of CaF2:Tm and Li7F thermoluminescent materials was studied by irradiation of both materials along the depth dose distribution of a Ne+10 and He+2...

The Effect of Polydispersiveness of Natural Radioactive Aerosols on Tracheobronchial Deposition (1982)

Distribution and retention of `2`3`9Pu in the tree shrew (Tupaia belangeri) following intramuscular injection. (1982)

The width of a log-normal aerosol size distribution, represented by its geometric standard deviation, sg, exerts a significant influence on regional lung deposition. This effect has been investigated...

Seidel, A., Darai, G., Fluegel, R., Hofmann, W., Sontag, W.

Health Physics, 43(1982) S.239-46

INTERKAMA '80 - Kurzvortragsreihe auf der Sonderschau 'Angewandte Forschung'. (1980)

Hofmann, W., [Hrsg.]

KfK-PDV 187 (August 80)

Properties of electromagnetic and hadronic showers measured with liquid argon calorimeters. (1979)

Babaev, A., Apel, W.D., Engler, J., Hofmann, W., Rauschnabel, K., Wegener, D.

Nuclear Instruments and Methods, 160(1979) S.427-34

Elastische Streuung von Quarks. (1978)

Hofmann, W., Wegener, D.

KfK-Nachrichten, 10(1978) No 1, S.12-14

Nachweis von Elektronen, Pionen und Protonen in einem totalabsorbierenden Fluessig-Argon-Kalorimeter. (1977)

Babaev, A., Engler, J., Hofmann, W., Rauschnabel, K., Wegener, D.

Fruehjahrstagung DPG, Teilchenphysik, Aachen, 29.-31.Maerz 1977. Verhandlungen der Deutschen Physikalischen Gesellschaft, R.6, Bd 12(1977) S.1079

Observation of jet structure in high p trans events at the ISR and the importance of parton transverse momentum. (1977)

Drijard, D., Fischer, H.G., Fontaine, G., Frehse, H., Frenkiel, P., Ghesquiere, C., ...

Nuclear Physics B, 127(1977) S.1-42

Ladungs- und Transversalimpulskorrelationen in Proton-Proton-Wechselwirkungen bei sehr hohen Energien. (1977)

Quantum number correlations and parton models. (1977)

Dissertation, Univ.Karlsruhe 1977

Identifizierung von Elektronen mit einem Fluessig-Argon-Kalorimeter. (1976)

Experimental Physics Seminar, CERN, Geneve, December 5, 1977

Engler, J., Hofmann, W., Spengler, J., Wegener, D.

Fruehjahrstagung DPG, Kernphysik und Hochenergiephysik, B: Teilchenphysik, Karlsruhe, 10.-12. Maerz 1976. Verhandlungen der Deutschen Physikalischen Gesellschaft, R.6, Bd 11(1976) S.349

Study of jet structure in proton-proton collisions with large transverse momentum secondaries. (1976)

Della Negra, M., Drijard, D., Fischer, H.G., Fontaine, G., Frenkiel, P., Ghesquiere, C., ...

18. Internat. Conference on High Energy Physics, Tbilisi,USSR, July 15-21, 1976

General characteristics of events with a particle of large transverse momentum in pp collisions at #Ös = 52.5 GeV. (1976)

Della Negra, M., Drijard, D., Fischer, H.G., Fontaine, G., Frehse, H., Frenkiel, P., ...

18. Internat. Conference on High Energy Physics, Tbilisi, USSR, July 15-21, 1976

Study of double pomeron exchange in pp collisions at #Ös = 31 GeV. (1976)

Della Negra, M., Drijard, D., Fischer, H.G., Fontaine, G., Frehse, H., Frenkiel, P., ...

18. Internat. Conference on High Energy Physics, Tbilisi, USSR, July 15-21, 1976

Electron-proton separation with a liquid argon-lead sandwich detector. (1976)

Engler, J., Hofmann, W., Spengler, J., Wegener, D.

Nuclear Instruments and Methods, 133(1976) S.521-24

Production and transport of conduction electrons in a liquid argon ionization chamber. (1976)

Hofmann, W., Klein, U., Schulz, M., Spengler, J., Wegener, D.

Nuclear Instruments and Methods, 135(1976) S. 151-56

Study of double pomeron exchange in pp collisions at #Ös=31 GeV. (1976)

Della Negra, M., Drijard, D., Fischer, H.G., Fontaine, G., Frehse, H., Frenkiel, P., ...

Physics Letters, 65 B(1976) S. 394-96

Ein Fluessig-Argon-Ionisationskalorimeter zum Nachweis elektromagnetischer und hadronischer Schauer. (1975)