Beam-Helicity Asymmetries in Double Pion Photoproduction off the Proton (2009)
Krambrich, D., Zehr, F., Fix, A., Roca, L., Aguar, P., Ahrens, J., ...
Beam-helicity asymmetries have been measured at the MAMI accelerator in Mainz in the three isospin channels $\vec{\gamma}p\to \pi^{+}\pi^0n$, $\vec{\gamma}p\to \pi^{0}\pi^0p$ and $\vec{\gamma}p\to...
Helicity dependence of the total inclusive cross section on the deuteron (2009)
Ahrens, J, Altieri, S, Annand, JRM, Ryckbosch, Dirk
A measurement of the helicity dependence of the total inclusive photoabsorption cross section on the deuteron was carried out at MAMI (Mainz) in the energy range 200 < E gamma < 800 MeV. The...
Unverzagt, M., Aguar-Bartolome, P., Ahrens, J., Annand, J. R. M., Arends, H. J., Beck, R., ...
A precise measurement of the Dalitz plot parameter, alpha, for the eta->3pi^0 decay is presented. The experiment was performed with the Crystal Ball and TAPS large acceptance photon detectors at the...
The search for muon neutrinos from northern hemisphere gamma-ray bursts with AMANDA (2008)
Achterberg, A., Ackermann, M., Adams, J., Ahrens, J., Andeen, K., Auffenberg, J., ...
Search for ultra-high-energy neutrinos with amanda-II (2008)
Ackermann, M., Adams, J., Ahrens, J., Andeen, K., Auffenberg, J., Bai, X., ...
The search for muon neutrinos from northern hemisphere gamma-ray bursts with amanda (2008)
Achterberg, A., Ackermann, M., Adams, J., Ahrens, J., Andeen, K., Auffenberg, J., ...
The search for muon neutrinos from northern hemisphere gamma-ray bursts with amanda (2008)
ACHTERBERG, A, ACKERMANN, M, ADAMS, J, AHRENS, J, ANDEEN, K, AUFFENBERG, J, ...
Search for ultra-high-energy neutrinos with amanda-II (2008)
ACKERMANN, M, ADAMS, J, AHRENS, J, ANDEEN, K, AUFFENBERG, J, BAI, X, ...
ACHTERBERG, A, ACKERMANN, M, ADAMS, J, AHRENS, J, ANDEEN, K, ATLEE, DW, ...
Upgrade of the Glasgow photon tagging spectrometer for Mainz MAMI-C (2007)
McGeorge, J. C., Kellie, J. D., Annand, J. R. M., Ahrens, J., Anthony, I., Clarkson, A., ...
The Glasgow photon tagging spectrometer at Mainz has been upgraded so that it can be used with the 1500 MeV electron beam now available from the Mainz microtron MAMI-C. The changes made and the...
Incoherent pion photoproduction on $^{12}$C (2007)
Tarbert, C. M., Watts, D. P., Aguar, P., Ahrens, J., Annand, J. R. M., Arends, H. J., ...
We present the first detailed measurement of incoherent photoproduction of neutral pions to a discrete state of a residual nucleus. The $^{12}$C$(\gamma,\pi^{0})^{12}$C$^{*}_{4.4MeV}$ reaction has...
Double pion photoproduction off 40Ca (2007)
Bloch, F., Ahrens, J., Annand, J. R. M., Beck, R., Fog, L. S., Hornidge, D., ...
The photoproduction of pi0pi0 and pi0pi+/- pairs off 40Ca has been investigated with the TAPS detector using the Glasgow photon tagging spectrometer at the Mainz MAMI accelerator. Data have been...
Search for Neutrino-Induced Cascades From Gamma-Ray Bursts with AMANDA. (2007)
A. Achterberg, M. Ackermann, J. Adams, J. Ahrens, K. Andeen, ...
Journal article
J. Ahrens, J.L. Kelley, IceCube Collaboration
Contribution to a conf. proceeding (book/online)
Detection of atmospheric muon neutrinos with the IceCube 9-string detector (2007)
Achterberg, A., Ackermann, M., Adams, J., Ahrens, J., Andeen, K., Auffenberg, J., ...
Search for neutrino-induced cascades from gamma-ray bursts with Amanda (2007)
Achterberg, A., Ackermann, M., Adams, J., Ahrens, J., Andeen, K., Auffenberg, J., ...
Multiyear search for a diffuse flux of muon neutrinos with AMANDA-II (2007)
Achterberg, A., Ackermann, M., Adams, J., Ahrens, J., Andeen, K., Auffenberg, J., ...
AHRENS, J, ALTIERI, S, ANNAND, JRM, ARENDS, HJ, BECK, R, BRADTKE, C, ...
Detection of atmospheric muon neutrinos with the IceCube 9-string detector (2007)
ACHTERBERG, A, ACKERMANN, M, ADAMS, J, AHRENS, J, ANDEEN, K, AUFFENBERG, J, ...
Search for neutrino-induced cascades from gamma-ray bursts with Amanda (2007)
ACHTERBERG, A, ACKERMANN, M, ADAMS, J, AHRENS, J, ANDEEN, K, AUFFENBERG, J, ...
ACHTERBERG, A, ACKERMANN, M, ADAMS, J, AHRENS, J, ANDEEN, K, ATLEE, DW, ...
First measurement of the helicity dependence for the gamma p -> p pi(+)pi(-) reaction (2007)
AHRENS, J, ALTIERI, S, ANNAND, JRM, ARENDS, HJ, BECK, R, BLACKSTON, MA, ...
Multiyear search for a diffuse flux of muon neutrinos with AMANDA-II (2007)
ACHTERBERG, A, ACKERMANN, M, ADAMS, J, AHRENS, J, ANDEEN, K, AUFFENBERG, J, ...
Ackermann, M, Adams, J, Ahrens, J, Andeen, K, Atlee, D W, ...
On 27 December 2004, a giant gamma flare from the Soft Gamma-Ray Repeater 1806-20 saturated many satellite gamma-ray detectors, being the brightest transient event ever observed in the Galaxy....
Optical properties of deep glacial ice at the South Pole (2006)
IceCube Collaboration, Ackermann, M., Adams, J., Ahrens, J., Andeen, K., Auffenberg, J., ...
Limits to the muon flux from neutralino annihilations in the Sun with the AMANDA detector (2006)
AMANDA Collaboration, Ackermann, M., Adams, J., Ahrens, J., Andeen, K., Auffenberg, J., ...
The ICECUBE prototype string in AMANDA (2006)
AMANDA Collaboration, Achterberg, A., Ackermann, M., Adams, J., Ahrens, J., Andeen, K., ...
First year of performance of the Icecube neutrino telescope (2006)
IceCube Collaboration, Ackermann, M., Adams, J., Ahrens, J., Andeen, K., Auffenberg, J., ...
AHRENS, J, ALTIERI, S, ANNAND, JRM, ARENDS, HJ, BECK, R, BRADTKE, C, ...
Measurement of the Gerasimov-Drell-Hearn integrand for H-2 from 200 to 800 MeV (2006)
AHRENS, J, ALTIERI, S, ANNAND, JRM, ARENDS, HJ, BECK, R, BRADTKE, C, ...
DUTZ, H, HELBING, K, KRIMMER, J, SPECKNER, T, ZEITLER, G, AHRENS, J, ...
Intermediate resonance excitation in the gamma p -> p pi(0)pi(0) reaction (2005)
AHRENS, J, ALTIERI, S, ANNAND, JRM, ANTON, G, ARENDS, HJ, AULENBACHER, K, ...
AHRENS, J, ALTIERI, S, ANNAND, JRM, ARENDS, HJ, BECK, R, BRAGHIERI, A, ...
Calibration and survey of AMANDA with the SPASE detectors. (2005)
Nuclear Instruments and Methods in Physics Research A, 522(2004) S.347-59
Measurement of the pi^+ meson polarizabilities via the gamma p->gamma pi^+ n reaction (2004)
Ahrens, J., Alexeev, V. M., Annand, J. R. M., Arends, H. J., Beck, R., Caselotti, G., ...
An experiment on the radiative pi^+ meson photoproduction from the proton (gamma p->gamma pi^+ n) was carried out at the Mainz Microtron MAMI in the kinematic region 537 MeV
Photoproduction of pi0-mesons from nuclei (2004)
Krusche, B., Lehr, J., Ahrens, J., Annand, J. R. M., Beck, R., Bloch, F., ...
Photoproduction of neutral pions from nuclei (carbon, calcium, niobium, lead) has been studied for incident photon energies from 200 MeV to 800 MeV with the TAPS detector using the Glasgow photon...
Sensitivity of the icecube detector to astrophysical sources of high energy muon neutrinos (2004)
Ahrens, J., Bahcall, John N., Bai, X., Bay, R.C., Becka, T., ...
We present the results of a Monte-Carlo study of the sensitivity of the planned IceCube detector to predicted fluxes of muon neutrinos at TeV to PeV energies. A complete simulation of the detector...
Double pi0 photoproduction off the proton at threshold (2004)
Kotulla, M., Ahrens, J., Annand, J.R.M., Beck, R., Hornidge, D., Janssen, S., ...
The reaction gammap → pi(0)pi(0)p has been measured using the TAPS BaF2 calorimeter at the tagged photon facility of the Mainz Microtron accelerator. Chiral perturbation theory (ChPT) predicts that...
Experimental check of the Gerasimov-Drell-Hearn sum rule for H-1 (2004)
DUTZ, H, HELBING, K, KRIMMER, J, SPECKNER, T, ZEITLER, G, AHRENS, J, ...
Measurement of the cosmic ray composition at the knee with the SPASE-2/AMANDA-B10 detectors. (2004)
Ahrens, J., Barwick, S.W., Engel, R., [FZKA-Mitarb.], U.a. Autoren, ...
Astroparticle Physics, 21(2004) S.565-81
Photoproduction of eta-mesic 3He (2003)
Pfeiffer, M., Ahrens, J., Annand, J. R. M., Beck, R., Caselotti, G., Cherepnya, S., ...
The photoproduction of eta-mesic 3He has been investigated using the TAPS calorimeter at the Mainz Microtron accelerator facility MAMI. The total inclusive cross section for the reaction...
Double $\pi^0$ Photoproduction off the Proton at Threshold (2003)
Kotulla, M., Ahrens, J., Annand, J. R. M., Beck, R., Hornidge, D., Janssen, S., ...
The reaction $\gamma p \to \pi^0 \pi^0 p$ has been measured using the TAPS BaF$_2$ calorimeter at the tagged photon facility of the Mainz Microtron accelerator. Chiral perturbation theory (ChPT)...
Quasi-free $\pi^0$ Photoproduction from the Bound Nucleon (2003)
Kossert, K., Camen, M., Wissmann, F., Ahrens, J., Annand, J. R. M., ...
Differential cross-sections for quasi-free $\pi^0$ photoproduction from the proton and neutron bound in the deuteron have been measured for $E_\gamma= 200 - 400$ MeV at $\theta^{\rm lab}_\gamma =...
First measurement of the helicity-dependent gamma p to p eta differential cross-section (2003)
Ahrens, J., Altieri, S., Annand, J.R.M., Anton, G., Arends, H.J., Aulenbacher, K., ...
The helicity dependence of the gamma p to p eta reaction has been measured for the first time at a center-of-mass angle theta /sub eta //sup */=70 degrees in the photon energy range from 780 MeV to...
Threshold enhancement in eta photoproduction from 2H and 4He (2003)
Hejny, V., Weiss, J., Achenbach, P., Ahrens, J., Annand, J. R. M., Beck, R., ...
The photoproduction of eta-mesons from 2H and 4He has been studied for energies close to the production thresholds. The experiments were carried out with the tagged photon beam of the Mainz MAMI...
Coherent pi0-photoproduction from atomic nuclei (2003)
Krusche, B., Ahrens, J., Beck, R., Kamalov, S., Metag, V., Owens, R. O., ...
Differential and total cross sections for coherent pi0-photoproduction from 12C, 40Ca, 93Nb and Pb targets have been measured throughout the region of the Delta(1232)-resonance. The experiments were...
Exclusive measurement of coherent eta photoproduction from the deuteron (2003)
Weiss, J., Achenbach, P., Ahrens, J., Annand, J. R. M., Beck, R., Hejny, V., ...
Coherent photoproduction of eta mesons from the deuteron has been measured from threshold up to incident photon energies of 750 MeV using the photon spectrometer TAPS at the tagged photon facility at...
In-medium properties of the D13(1520) nucleon resonance (2003)
Krusche, B., Ahrens, J., Beck, R., MacGregor, I. J. D., McGeorge, J. C., Metag, V., ...
The in-medium properties of the D13(1520) nucleon resonance were studied via photoproduction of pi0-mesons from nuclei (C, Ca, Nb, Pb) with the TAPS-detector at the Mainz MAMI accelerator. The...
Quasi-free Compton scattering and the polarizabilities of the neutron (2003)
Kossert, K., Camen, M., Wissmann, F., Ahrens, J., Annand, J.R.M., Arends, H.J., ...
Differential cross-sections for quasi-free Compton scattering from the proton and neutron bound in the deuteron have been measured using the Glasgow/Mainz photon tagging spectrometer at the Mainz...
Ahrens, J., Altieri, S., Annand, J.R.M., Anton, G., Arends, H.J., Aulenbacher, K., ...
The helicity dependence of the total cross section for the gamma p to n pi /sup +/ pi /sup 0/ reaction has been measured for the first time at incident photon energies from 400 to 800 MeV. The...
Three-nucleon mechanisms in photoreactions (2003)
Watts, D.P., Ahrens, J., Annand, J.R.M., Beck, R., Branford, D., Grabmayr, P., ...
The /sup 12/C( gamma , ppn) reaction has been measured for E/sub gamma /=150-800 MeV in the first study of this reaction in a target heavier than /sup 3/He. The experimental data are compared to a...
First measurement of the Gerasimov-Drell-Hearn sum rule for H-1 from 0.7 to 1.8 GeV at ELSA (2003)
DUTZ, H, HELBING, K, KRIMMER, J, SPECKNER, T, ZEITLER, G, AHRENS, J, ...
Three-nucleon mechanisms in photoreactions (2002)
Watts, D. P., Ahrens, J., Annand, J. R. M, Beck, R., Branford, D., Grabmayr, P., ...
The $^{12}$C$(\gamma,ppn)$ reaction has been measured for E$_{\gamma}$=150-800 MeV in the first study of this reaction in a target heavier than $^3$He. The experimental data are compared to a...
Kotulla, M., Ahrens, J., Annand, J. R. M., Beck, R., Caselotti, G., Fog, L. S., ...
The reaction $\gamma p \to \pi^\circ \gamma^\prime p$ has been measured with the TAPS calorimeter at the Mainz Microtron accelerator facility MAMI for energies between $\sqrt{s}$ = 1221--1331 MeV....
Quasi-free Compton Scattering and the Polarizabilities of the Neutron (2002)
Kossert, K., Camen, M., Wissmann, F., Ahrens, J., Annand, J. R. M., ...
Differential cross sections for quasi-free Compton scattering from the proton and neutron bound in the deuteron have been measured using the Glasgow/Mainz tagging spectrometer at the Mainz MAMI...
Search for Point Sources of High Energy Neutrinos with AMANDA (2002)
Ahrens, J., Bai, X., Barouch, G., Barwick, S. W.
This paper describes the search for astronomical sources of high-energy neutrinos using the AMANDA-B10 detector, an array of 302 photomultiplier tubes, used for the detection of Cherenkov light from...
Search for Neutrino-Induced Cascades with the AMANDA Detector (2002)
We report on a search for electromagnetic and/or hadronic showers (cascades) induced by a diffuse flux of neutrinos with energies between 5 TeV and 300 TeV from extraterrestrial sources. Cascades may...
In-medium modifications of the $\pi\pi$ interaction in photon-induced reactions (2002)
Messchendorp, J. G., Janssen, S., Kotulla, M., Ahrens, J., Annand, J. R. H., Beck, R., ...
Differential cross sections of the reactions $(\gamma,\pi^\circ\pi^\circ)$ and $(\gamma,\pi^\circ\pi^++\pi^\circ\pi^-)$ have been measured for several nuclei ($^1$H,$^{12}$C, and $^{\rm nat}$Pb) at...
Neutron polarizabilities investigated by quasi-free Compton scattering from the deuteron (2002)
Kossert, K., Camen, M., Wissmann, F., Ahrens, J., Beck, R., ...
Measuring Compton scattered photons and recoil neutrons in coincidence, quasi-free Compton scattering by the neutron has been investigated at MAMI (Mainz) at $theta^{lab}_\gamma=136^o$ in an energy...
Ahrens, J., Altieri, S., Annand, J.R.M., Anton, G., Arends, H.J., Aulenbacher, K., ...
The helicity dependence of the (γ) over right arrow(p) over right arrow →ppi(0) reaction has been measured for the first time in the photon-energy range from 550 to 790 MeV. The experiment,...
Branford, D., Arneil, J.F., MacKenzie, J.A., Fohl, K., Ahrens, J., Annand, J.R.M., ...
Measurements of the He-4(gamma,pi(+)n)H-3 and He- 4(gamma,pi(+)p)nnn reactions in quasifree pi production kinematic regimes have been performed using unpolarized and linearly polarized tagged photons...
Threshold enhancement in eta photoproduction from H-2 and He-4 (2002)
Hejny, V., Weiss, J., Achenbach, P., Ahrens, J., Annand, J.R.M., Beck, R., ...
The photoproduction of eta-mesons from H-2 and He-4 has been studied for energies close to the production thresholds. The experiments were carried out with the tagged photon beam of the Mainz MAMI...
Neutron polarizabilities investigated by quasifree Compton scattering from the deuteron (2002)
Kossert, K., Camen, M., Wissmann, F., Ahrens, J., Annand, J.R.M., Arends, H.J., ...
Measuring Compton scattered photons and recoil neutrons in coincidence, quasifree Compton scattering by the neutron has been investigated at MAMI (Mainz) at theta(gamma)(lab) = 136degrees in an...
Coherent pi0-photoproduction from atomic nuclei (2002)
Krusche, B., Ahrens, J., Beck, R., Kamalov, S., Metag, V., Owens, R.O., ...
Differential and total cross sections for coherent pi(0)- photoproduction from C-12, Ca-40, Nb-93 and Pb targets have been measured throughout the region of the Delta(1232)- resonance. The...
In-medium modifications of the ππ interaction in photon-induced reactions (2002)
Messchendorp, J.G., Janssen, S., Kotulla, M., Ahrens, J., Annand, J.R.H., Beck, R., ...
Differential cross sections of the reactions (gamma,pi(0)pi(0)) and (gamma,pi(0)pi(+/-)) have been measured for several nuclei (H-1,C-12, and Pb-nat) at an incident-photon energy of E-gamma=400-460...
Backward spin polarizability $\gamma_\pi$ of the proton (2001)
Camen, M., Kossert, K., Wissmann, F., Ahrens, J., Beck, R., ...
Using the Mainz $48 cm {\O}\times 64 cm$ NaI(Tl) detector and the segmented G\"ottingen recoil detector SENECA in coincidence, Compton scattering by the proton at $\theta^{lab}_\gamma = 136^\circ$...
Physics Results from the AMANDA Neutrino Detector (2001)
In the winter season of 2000, the AMANDA (Antarctic Muon And Neutrino Detector Array) detector was completed to its final state. We report on major physics results obtained from the AMANDA-B10...
Physics Results from the AMANDA Neutrino Detector (2001)
In the winter season of 2000, the AMANDA (Antarctic Muon And Neutrino Detector Array) detector was completed to its final state. We report on major physics results obtained from the AMANDA-B10...
Compton Scattering by the Proton using a Large-Acceptance Arrangement (2001)
Wolf, S., Lisin, V., Kondratiev, R., Massone, A. M., Galler, G., Ahrens, J., ...
Compton scattering by the proton has been measured using the tagged-photon facility at MAMI (Mainz) and the large-acceptance arrangement LARA. The new data are interpreted in terms of dispersion...
Search for Supernova Neutrino-Bursts with the AMANDA Detector (2001)
The core collapse of a massive star in the Milky Way will produce a neutrino burst, intense enough to be detected by existing underground detectors. The AMANDA neutrino telescope located deep in the...
Test of low-energy theorems for p(\vec{gamma},\pi^{0})p in the threshold region (2001)
Schmidt, A., Achenbach, P., Ahrens, J., Arends, H. J., Beck, R., Bernstein, A. M., ...
The photon asymmetry in the reaction p(\vec{\gamma},\pi^{0})p close to threshold has been measured for the first time with the photon spectrometer TAPS using linearly polarized photons from the...
Compton Scattering by the Proton (2001)
Galler, G., Lisin, V., Kondratiev, R., Massone, A. M., Wolf, S., Ahrens, J., ...
Compton scattering by the proton has been measured over a wide range covering photon energies 250 MeV < E_\gamma < 800 MeV and photon scattering angles 30^0 < \theta^{lab}_\gamma < 150^0, using the...
In-medium properties of the D13(1520) nucleon resonance (2001)
Krusche, B., Ahrens, J., Beck, R., MacGregor, I. J. D., MacGeorge, J. C., Metag, V., ...
This version is available at the following Publisher URL: http://prl.aps.org
Direct observation of a rho decay of the D13(1520) baryon resonance (2001)
Langgärtner, L. L., Ahrens, J., Beck, R., Hejny, V., Kotulla, M., Krusche, B., ...
This version is available at the following Publisher URL: http://prl.aps.org
Test of low energy theorems for H(gamma, pi0)1 H in the threshold region (2001)
Schmidt, A., Achenbach, P., Ahrens, J., Arends, H. J., Beck, R., Bernstein, A. M., ...
This version is available at the following Publisher URL: http://prl.aps.org
First measurement of the Gerasimov-Drell-Hearn integral for 1H from 200 to 800 MeV (2001)
Ahrens, J., Altieri, S., Annand, J.R.M., Anton, G., Arends, H.J., Aulenbacher, K., ...
A direct measurement of the helicity dependence of the total photoabsorption cross section an the proton was carried out at MAMI (Mainz) in the energy range 200 lt E-[gamma] lt 800 MeV. The...
In-medium properties of the D13(1520)nucleon resonance (2001)
Krusche, B., Ahrens, J., Beck, R., MacGregor, I.J.D., McGeorge, J.C., Metag, V., ...
The in-medium properties of the D13(1520) nucleon resonance were studied via photoproduction of pi (0) mesons from nuclei (C, Ca, Nb, Pb) with the TAPS detector at the Mainz Microton accelerator. The...
Direct observation of a rho decay of the D-13(1520) baryon resonance (2001)
Langgartner, W., Ahrens, J., Beck, R., Hejny, V., Kotulla, M., Krusche, B., ...
The reaction gammap → pi (+)pi (o)n has been measured at MAMI for photon energies up to 820 MeV. Invariant mass spectra of the particles in the final state (pi (+)n), (pi (o)n), (pi (+)pi (o)) have...
Powrie, C.J.Y., McGeorge, J.C., MacGregor, I.J.D., Ahrens, J., Annand, J.R.M., Arneil, J.F., ...
The C-12([([gamma])over right arrow], pp) and C- 12([([gamma])over right arrow], pn) reactions have been studied for E-gamma = 160-350 MeV using linearly polarized photons from the Glasgow tagged...
Test of low-energy theorems for H-1(gamma over-right- arrow,pi(0))H-1 in the threshold region (2001)
Schmidt, A., Achenbach, P., Ahrens, J., Arends, H.J., Beck, R., Bernstein, A.M., ...
The photon asymmetry in the reaction H-1([([gamma])over right arrow], pi (0))H-1 close to threshold has been measured for the first time with the photon spectrometer TAPS using linearly polarized...
Exclusive measurement of coherent eta -photoproduction from the deuteron (2001)
Weiss, J., Achenbach, P., Ahrens, J., Annand, J.R.M., Beck, R., Hejny, V., ...
Coherent photoproduction of eta -mesons from the deuteron has been measured from threshold up to E/sub gamma / approximately=750 MeV using the photon spectrometer TAPS at the tagged photon facility...
Compton scattering by the proton using a large-acceptance arrangement (2001)
Wolf, S., Lisin, V., Kondratiev, R., Massone, A.M., Galler, G., Ahrens, J., ...
Compton scattering by the proton has been measured over a wide range covering photon energies 250 MeV lt or approximately=E/sub gamma / lt or approximately=800 MeV and photon scattering angles 30...
Direct Observation of a rho Decay of the D13(1520) Baryon Resonance (2001)
Ahrens, J., Beck, R., Hejny, V., Kotulla, M., Langgärtner, W.
Test of Low-Energy Theorems for 1H(gamma-vector , pi0)1H in the Threshold Region (2001)
Achenbach, P., Ahrens, J., Arends, H. J., Beck, R., Schmidt, A.
In-Medium Properties of the D13(1520) Nucleon Resonance (2001)
Ahrens, J., Beck, R., Krusche, B., MacGregor, I. J. D., McGeorge, J. C.
Search for narrow dibaryon resonances in neutral pion photoproduction from the deuteron (2000)
Siodlaczek, U., Achenbach, P., Ahrens, J., Arends, H.J., Beck, R., Bilger, R., ...
The reaction gamma d to pi /sup 0/X has been measured with TAPS at MAMI in the energy range E/sub gamma /=140-300 MeV. Using the Glasgow tagging spectrometer a photon energy resolution of 0.8 MeV was...
Photoproduction of neutral pion pairs from the proton (2000)
Wolf, M., Ahrens, J., Beck, R., Hejny, V., Kellie, J.D., Kotulla, M., ...
Double neutral pion photoproduction from the proton has been measured at MAMI for photon energies between threshold and 820 MeV. The reaction was identified by an invariant mass and missing mass...
Vangerow, B, Cobas Meyer, M, Ahrens, J, Schuerholz, T, Marx, G, Moeller, M, ...
No abstract available.
Cobas Meyer, M, Vangerow, B, Ahrens, J, Schuerholz, T, Marx, G, Rueckoldt, H
No abstract available.
Beck, R., Krahn, H.P., Ahrens, J., Annand, J.R.M., Arends, H.J., Audit, G., ...
Tagged linearly polarized photons have been used at the Mainz Microtron (MAMI) for simultaneous measurements of the p( gamma ,p) pi /sup 0/ and p( gamma , pi /sup +/)n reaction channels to study the...
Nuclear pion photoproduction in the Delta resonance region (2000)
Branford, D., MacKenzie, J.A., Lee, F.X., Ahrens, J., Annand, J.R.M., Beck, R., ...
A measurement of the /sup 12/C( gamma , pi /sup +/n)/sup 11/B reaction in quasifree pi -production kinematic regimes has been performed using tagged photons in conjunction with large solid angle pi...
Ahrens, J., Altieri, S., Annand, J.R.M., Anton, G., Arends, H.J., Aulenbacher, K., ...
The helicity dependence of the single pion photoproduction on the proton has been measured in the energy range from 200 to 450 MeV for the first time. The experiment, performed at the Mainz microtron...
Double-pi0photoproduction from the deuteron (2000)
Kleber, V., Achenbach, P., Ahrens, J., Beck, R., Hejny, V., Kellie, J.D., ...
The photoproduction of two neutral pions from the deuteron has been studied for incident photon energies from 200 MeV to 820 MeV with the TAPS spectrometer at MAMI (Mainz Microtron). The total...
The 12C(gamma,NN) reaction studied over a wide kinematic range (2000)
Watts, D.P., MacGregor, I.J.D., Ahrens, J., Annand, J.R.M., Beck, R., Branford, D., ...
The12C( gamma,np) and 12C( gamma,pp) reactions have been studied using the Glasgow photon tagging spectrometer at the Mainz MAMI electron microtron for E gamma = 150-700 MeV over a kinematic range...
Coherent \pi^\circ photoproduction from ^4He (1999)
Rambo, F., Achenbach, P., Ahrens, J., Beck, R., Hall, S. J., ...
Differential cross sections and beam asymmetries for coherent \pi^\circ photoproduction from ^4He in the \Delta energy-range have been measured with high statistical and systematic precisions using...
C-12((gamma)over-right-arrow,pn) photon asymmetry for E-gamma=180-340MeV. (1999)
FRANCZUK, S, MACGREGOR, IJD, AHRENS, J, ANNAND, JRM, ARNEIL, JF, BECK, R, ...
Mechanisms in the C-12(gamma,pn) and (gamma,pp) reactions. (1998)
MACGREGOR, IJD, YAU, TTH, AHRENS, J, ANNAND, JRM, BECK, R, BRANFORD, D, ...
Total cross section measurement for the three double pion production channels on the proton (1995)
Braghieri, A, Murphy, L Y, Audit, G, Laget, J M, Ahrens, J, D'Hose, N, ...
PROTON PHOTOPRODUCTION FROM C-12. (1995)
CROSS, GE, MACGREGOR, IJD, MCGEORGE, JC, AHRENS, J, ANTHONY, I, ANNAND, JRM, ...
A SOURCE OF POLARIZED ELECTRONS BASED ON PHOTOEMISSION OF GAASP (1990)
Hartmann, W., Conrath, D., Gasteyer, W., Gessinger, H. J., Heil, W., Kessler, H., ...
Ahrens, J., Gimm, H., Beuermann, T., Rullhusen, P., Schumacher, M., Fricke, Burkhard, ...
Supported by Deutsche Forschungsgemeinschaft (SFB 201 and contract Schu 222/6-2)
Ahrens, J., Gimm, H., Beuermann, T., Rullhusen, P., Schumacher, M., Fricke, Burkhard, ...
Supported by Deutsche Forschungsgemeinschaft (SFB 201 and contract Schu 222/6-2)
First measurement of the helicity-dependent gamma p to p eta differential cross-section
Ahrens, J., Altieri, S., Annand, J.R.M., Anton, G., Arends, H.J., Aulenbacher, K., ...
The helicity dependence of the gamma p to p eta reaction has been measured for the first time at a center-of-mass angle theta /sub eta //sup */=70 degrees in the photon energy range from 780 MeV to...
First measurement of the Gerasimov-Drell-Hearn integral for 1H from 200 to 800 MeV
Ahrens, J., Altieri, S., Annand, J.R.M., Anton, G., Arends, H.J., Aulenbacher, K., ...
A direct measurement of the helicity dependence of the total photoabsorption cross section an the proton was carried out at MAMI (Mainz) in the energy range 200 lt E-[gamma] lt 800 MeV. The...
Ahrens, J., Altieri, S., Annand, J.R.M., Anton, G., Arends, H.J., Aulenbacher, K., ...
The helicity dependence of the (γ) over right arrow(p) over right arrow →ppi(0) reaction has been measured for the first time in the photon-energy range from 550 to 790 MeV. The experiment,...
Ahrens, J., Altieri, S., Annand, J.R.M., Anton, G., Arends, H.J., Aulenbacher, K., ...
The helicity dependence of the total cross section for the gamma p to n pi /sup +/ pi /sup 0/ reaction has been measured for the first time at incident photon energies from 400 to 800 MeV. The...
Ahrens, J., Altieri, S., Annand, J.R.M., Anton, G., Arends, H.J., Aulenbacher, K., ...
The helicity dependence of the single pion photoproduction on the proton has been measured in the energy range from 200 to 450 MeV for the first time. The experiment, performed at the Mainz microtron...
Beck, R., Krahn, H.P., Ahrens, J., Annand, J.R.M., Arends, H.J., Audit, G., ...
Tagged linearly polarized photons have been used at the Mainz Microtron (MAMI) for simultaneous measurements of the p( gamma ,p) pi /sup 0/ and p( gamma , pi /sup +/)n reaction channels to study the...
Branford, D., Arneil, J.F., MacKenzie, J.A., Fohl, K., Ahrens, J., Annand, J.R.M., ...
Measurements of the He-4(gamma,pi(+)n)H-3 and He- 4(gamma,pi(+)p)nnn reactions in quasifree pi production kinematic regimes have been performed using unpolarized and linearly polarized tagged photons...
Nuclear pion photoproduction in the Delta resonance region
Branford, D., MacKenzie, J.A., Lee, F.X., Ahrens, J., Annand, J.R.M., Beck, R., ...
A measurement of the /sup 12/C( gamma , pi /sup +/n)/sup 11/B reaction in quasifree pi -production kinematic regimes has been performed using tagged photons in conjunction with large solid angle pi...
Threshold enhancement in eta photoproduction from H-2 and He-4
Hejny, V., Weiss, J., Achenbach, P., Ahrens, J., Annand, J.R.M., Beck, R., ...
The photoproduction of eta-mesons from H-2 and He-4 has been studied for energies close to the production thresholds. The experiments were carried out with the tagged photon beam of the Mainz MAMI...
Double-pi0photoproduction from the deuteron
Kleber, V., Achenbach, P., Ahrens, J., Beck, R., Hejny, V., Kellie, J.D., ...
The photoproduction of two neutral pions from the deuteron has been studied for incident photon energies from 200 MeV to 820 MeV with the TAPS spectrometer at MAMI (Mainz Microtron). The total...
Neutron polarizabilities investigated by quasifree Compton scattering from the deuteron
Kossert, K., Camen, M., Wissmann, F., Ahrens, J., Annand, J.R.M., Arends, H.J., ...
Measuring Compton scattered photons and recoil neutrons in coincidence, quasifree Compton scattering by the neutron has been investigated at MAMI (Mainz) at theta(gamma)(lab) = 136degrees in an...
Quasi-free Compton scattering and the polarizabilities of the neutron
Kossert, K., Camen, M., Wissmann, F., Ahrens, J., Annand, J.R.M., Arends, H.J., ...
Differential cross-sections for quasi-free Compton scattering from the proton and neutron bound in the deuteron have been measured using the Glasgow/Mainz photon tagging spectrometer at the Mainz...
Double pi0 photoproduction off the proton at threshold
Kotulla, M., Ahrens, J., Annand, J.R.M., Beck, R., Hornidge, D., Janssen, S., ...
The reaction gammap → pi(0)pi(0)p has been measured using the TAPS BaF2 calorimeter at the tagged photon facility of the Mainz Microtron accelerator. Chiral perturbation theory (ChPT) predicts that...
Coherent pi0-photoproduction from atomic nuclei
Krusche, B., Ahrens, J., Beck, R., Kamalov, S., Metag, V., Owens, R.O., ...
Differential and total cross sections for coherent pi(0)- photoproduction from C-12, Ca-40, Nb-93 and Pb targets have been measured throughout the region of the Delta(1232)- resonance. The...
In-medium properties of the D13(1520)nucleon resonance
Krusche, B., Ahrens, J., Beck, R., MacGregor, I.J.D., McGeorge, J.C., Metag, V., ...
The in-medium properties of the D13(1520) nucleon resonance were studied via photoproduction of pi (0) mesons from nuclei (C, Ca, Nb, Pb) with the TAPS detector at the Mainz Microton accelerator. The...
Direct observation of a rho decay of the D-13(1520) baryon resonance
Langgartner, W., Ahrens, J., Beck, R., Hejny, V., Kotulla, M., Krusche, B., ...
The reaction gammap → pi (+)pi (o)n has been measured at MAMI for photon energies up to 820 MeV. Invariant mass spectra of the particles in the final state (pi (+)n), (pi (o)n), (pi (+)pi (o)) have...
In-medium modifications of the ππ interaction in photon-induced reactions
Messchendorp, J.G., Janssen, S., Kotulla, M., Ahrens, J., Annand, J.R.H., Beck, R., ...
Differential cross sections of the reactions (gamma,pi(0)pi(0)) and (gamma,pi(0)pi(+/-)) have been measured for several nuclei (H-1,C-12, and Pb-nat) at an incident-photon energy of E-gamma=400-460...
Powrie, C.J.Y., McGeorge, J.C., MacGregor, I.J.D., Ahrens, J., Annand, J.R.M., Arneil, J.F., ...
The C-12([([gamma])over right arrow], pp) and C- 12([([gamma])over right arrow], pn) reactions have been studied for E-gamma = 160-350 MeV using linearly polarized photons from the Glasgow tagged...
Test of low-energy theorems for H-1(gamma over-right- arrow,pi(0))H-1 in the threshold region
Schmidt, A., Achenbach, P., Ahrens, J., Arends, H.J., Beck, R., Bernstein, A.M., ...
The photon asymmetry in the reaction H-1([([gamma])over right arrow], pi (0))H-1 close to threshold has been measured for the first time with the photon spectrometer TAPS using linearly polarized...
Search for narrow dibaryon resonances in neutral pion photoproduction from the deuteron
Siodlaczek, U., Achenbach, P., Ahrens, J., Arends, H.J., Beck, R., Bilger, R., ...
The reaction gamma d to pi /sup 0/X has been measured with TAPS at MAMI in the energy range E/sub gamma /=140-300 MeV. Using the Glasgow tagging spectrometer a photon energy resolution of 0.8 MeV was...
The 12C(gamma,NN) reaction studied over a wide kinematic range
Watts, D.P., MacGregor, I.J.D., Ahrens, J., Annand, J.R.M., Beck, R., Branford, D., ...
The12C( gamma,np) and 12C( gamma,pp) reactions have been studied using the Glasgow photon tagging spectrometer at the Mainz MAMI electron microtron for E gamma = 150-700 MeV over a kinematic range...
Three-nucleon mechanisms in photoreactions
Watts, D.P., Ahrens, J., Annand, J.R.M., Beck, R., Branford, D., Grabmayr, P., ...
The /sup 12/C( gamma , ppn) reaction has been measured for E/sub gamma /=150-800 MeV in the first study of this reaction in a target heavier than /sup 3/He. The experimental data are compared to a...
Exclusive measurement of coherent eta -photoproduction from the deuteron
Weiss, J., Achenbach, P., Ahrens, J., Annand, J.R.M., Beck, R., Hejny, V., ...
Coherent photoproduction of eta -mesons from the deuteron has been measured from threshold up to E/sub gamma / approximately=750 MeV using the photon spectrometer TAPS at the tagged photon facility...
Photoproduction of neutral pion pairs from the proton
Wolf, M., Ahrens, J., Beck, R., Hejny, V., Kellie, J.D., Kotulla, M., ...
Double neutral pion photoproduction from the proton has been measured at MAMI for photon energies between threshold and 820 MeV. The reaction was identified by an invariant mass and missing mass...
Compton scattering by the proton using a large-acceptance arrangement
Wolf, S., Lisin, V., Kondratiev, R., Massone, A.M., Galler, G., Ahrens, J., ...
Compton scattering by the proton has been measured over a wide range covering photon energies 250 MeV lt or approximately=E/sub gamma / lt or approximately=800 MeV and photon scattering angles 30...
Efficacy of SCH39304 in murine cryptococcosis.
Restrepo, B I, Ahrens, J, Graybill, J R
Cryptococcal meningitis is increasing in frequency, in large part because of the advent of acquired immune deficiency syndrome. Using the murine cryptococcosis model, a new oral triazole, SCH39304,...
Efficacy of SCH39304 in murine cryptococcosis.
Restrepo, B I, Ahrens, J, Graybill, J R
Cryptococcal meningitis is increasing in frequency, in large part because of the advent of acquired immune deficiency syndrome. Using the murine cryptococcosis model, a new oral triazole, SCH39304,...
First measurement of the helicity-dependent gamma p to p eta differential cross-section
Ahrens, J., Altieri, S., Annand, J.R.M., Anton, G., Arends, H.J., Aulenbacher, K., ...
The helicity dependence of the gamma p to p eta reaction has been measured for the first time at a center-of-mass angle theta /sub eta //sup */=70 degrees in the photon energy range from 780 MeV to...
First measurement of the Gerasimov-Drell-Hearn integral for 1H from 200 to 800 MeV
Ahrens, J., Altieri, S., Annand, J.R.M., Anton, G., Arends, H.J., Aulenbacher, K., ...
A direct measurement of the helicity dependence of the total photoabsorption cross section an the proton was carried out at MAMI (Mainz) in the energy range 200 lt E-[gamma] lt 800 MeV. The...
Ahrens, J., Altieri, S., Annand, J.R.M., Anton, G., Arends, H.J., Aulenbacher, K., ...
The helicity dependence of the (γ) over right arrow(p) over right arrow →ppi(0) reaction has been measured for the first time in the photon-energy range from 550 to 790 MeV. The experiment,...
Ahrens, J., Altieri, S., Annand, J.R.M., Anton, G., Arends, H.J., Aulenbacher, K., ...
The helicity dependence of the total cross section for the gamma p to n pi /sup +/ pi /sup 0/ reaction has been measured for the first time at incident photon energies from 400 to 800 MeV. The...
Ahrens, J., Altieri, S., Annand, J.R.M., Anton, G., Arends, H.J., Aulenbacher, K., ...
The helicity dependence of the single pion photoproduction on the proton has been measured in the energy range from 200 to 450 MeV for the first time. The experiment, performed at the Mainz microtron...
Beck, R., Krahn, H.P., Ahrens, J., Annand, J.R.M., Arends, H.J., Audit, G., ...
Tagged linearly polarized photons have been used at the Mainz Microtron (MAMI) for simultaneous measurements of the p( gamma ,p) pi /sup 0/ and p( gamma , pi /sup +/)n reaction channels to study the...
Branford, D., Arneil, J.F., MacKenzie, J.A., Fohl, K., Ahrens, J., Annand, J.R.M., ...
Measurements of the He-4(gamma,pi(+)n)H-3 and He- 4(gamma,pi(+)p)nnn reactions in quasifree pi production kinematic regimes have been performed using unpolarized and linearly polarized tagged photons...
Nuclear pion photoproduction in the Delta resonance region
Branford, D., MacKenzie, J.A., Lee, F.X., Ahrens, J., Annand, J.R.M., Beck, R., ...
A measurement of the /sup 12/C( gamma , pi /sup +/n)/sup 11/B reaction in quasifree pi -production kinematic regimes has been performed using tagged photons in conjunction with large solid angle pi...
Threshold enhancement in eta photoproduction from H-2 and He-4
Hejny, V., Weiss, J., Achenbach, P., Ahrens, J., Annand, J.R.M., Beck, R., ...
The photoproduction of eta-mesons from H-2 and He-4 has been studied for energies close to the production thresholds. The experiments were carried out with the tagged photon beam of the Mainz MAMI...
Double-pi0photoproduction from the deuteron
Kleber, V., Achenbach, P., Ahrens, J., Beck, R., Hejny, V., Kellie, J.D., ...
The photoproduction of two neutral pions from the deuteron has been studied for incident photon energies from 200 MeV to 820 MeV with the TAPS spectrometer at MAMI (Mainz Microtron). The total...
Neutron polarizabilities investigated by quasifree Compton scattering from the deuteron
Kossert, K., Camen, M., Wissmann, F., Ahrens, J., Annand, J.R.M., Arends, H.J., ...
Measuring Compton scattered photons and recoil neutrons in coincidence, quasifree Compton scattering by the neutron has been investigated at MAMI (Mainz) at theta(gamma)(lab) = 136degrees in an...
Quasi-free Compton scattering and the polarizabilities of the neutron
Kossert, K., Camen, M., Wissmann, F., Ahrens, J., Annand, J.R.M., Arends, H.J., ...
Differential cross-sections for quasi-free Compton scattering from the proton and neutron bound in the deuteron have been measured using the Glasgow/Mainz photon tagging spectrometer at the Mainz...
Double pi0 photoproduction off the proton at threshold
Kotulla, M., Ahrens, J., Annand, J.R.M., Beck, R., Hornidge, D., Janssen, S., ...
The reaction gammap → pi(0)pi(0)p has been measured using the TAPS BaF2 calorimeter at the tagged photon facility of the Mainz Microtron accelerator. Chiral perturbation theory (ChPT) predicts that...
Coherent pi0-photoproduction from atomic nuclei
Krusche, B., Ahrens, J., Beck, R., Kamalov, S., Metag, V., Owens, R.O., ...
Differential and total cross sections for coherent pi(0)- photoproduction from C-12, Ca-40, Nb-93 and Pb targets have been measured throughout the region of the Delta(1232)- resonance. The...
In-medium properties of the D13(1520)nucleon resonance
Krusche, B., Ahrens, J., Beck, R., MacGregor, I.J.D., McGeorge, J.C., Metag, V., ...
The in-medium properties of the D13(1520) nucleon resonance were studied via photoproduction of pi (0) mesons from nuclei (C, Ca, Nb, Pb) with the TAPS detector at the Mainz Microton accelerator. The...
Direct observation of a rho decay of the D-13(1520) baryon resonance
Langgartner, W., Ahrens, J., Beck, R., Hejny, V., Kotulla, M., Krusche, B., ...
The reaction gammap → pi (+)pi (o)n has been measured at MAMI for photon energies up to 820 MeV. Invariant mass spectra of the particles in the final state (pi (+)n), (pi (o)n), (pi (+)pi (o)) have...
In-medium modifications of the ππ interaction in photon-induced reactions
Messchendorp, J.G., Janssen, S., Kotulla, M., Ahrens, J., Annand, J.R.H., Beck, R., ...
Differential cross sections of the reactions (gamma,pi(0)pi(0)) and (gamma,pi(0)pi(+/-)) have been measured for several nuclei (H-1,C-12, and Pb-nat) at an incident-photon energy of E-gamma=400-460...
Powrie, C.J.Y., McGeorge, J.C., MacGregor, I.J.D., Ahrens, J., Annand, J.R.M., Arneil, J.F., ...
The C-12([([gamma])over right arrow], pp) and C- 12([([gamma])over right arrow], pn) reactions have been studied for E-gamma = 160-350 MeV using linearly polarized photons from the Glasgow tagged...
Test of low-energy theorems for H-1(gamma over-right- arrow,pi(0))H-1 in the threshold region
Schmidt, A., Achenbach, P., Ahrens, J., Arends, H.J., Beck, R., Bernstein, A.M., ...
The photon asymmetry in the reaction H-1([([gamma])over right arrow], pi (0))H-1 close to threshold has been measured for the first time with the photon spectrometer TAPS using linearly polarized...
Search for narrow dibaryon resonances in neutral pion photoproduction from the deuteron
Siodlaczek, U., Achenbach, P., Ahrens, J., Arends, H.J., Beck, R., Bilger, R., ...
The reaction gamma d to pi /sup 0/X has been measured with TAPS at MAMI in the energy range E/sub gamma /=140-300 MeV. Using the Glasgow tagging spectrometer a photon energy resolution of 0.8 MeV was...
The 12C(gamma,NN) reaction studied over a wide kinematic range
Watts, D.P., MacGregor, I.J.D., Ahrens, J., Annand, J.R.M., Beck, R., Branford, D., ...
The12C( gamma,np) and 12C( gamma,pp) reactions have been studied using the Glasgow photon tagging spectrometer at the Mainz MAMI electron microtron for E gamma = 150-700 MeV over a kinematic range...
Three-nucleon mechanisms in photoreactions
Watts, D.P., Ahrens, J., Annand, J.R.M., Beck, R., Branford, D., Grabmayr, P., ...
The /sup 12/C( gamma , ppn) reaction has been measured for E/sub gamma /=150-800 MeV in the first study of this reaction in a target heavier than /sup 3/He. The experimental data are compared to a...
Exclusive measurement of coherent eta -photoproduction from the deuteron
Weiss, J., Achenbach, P., Ahrens, J., Annand, J.R.M., Beck, R., Hejny, V., ...
Coherent photoproduction of eta -mesons from the deuteron has been measured from threshold up to E/sub gamma / approximately=750 MeV using the photon spectrometer TAPS at the tagged photon facility...
Photoproduction of neutral pion pairs from the proton
Wolf, M., Ahrens, J., Beck, R., Hejny, V., Kellie, J.D., Kotulla, M., ...
Double neutral pion photoproduction from the proton has been measured at MAMI for photon energies between threshold and 820 MeV. The reaction was identified by an invariant mass and missing mass...
Compton scattering by the proton using a large-acceptance arrangement
Wolf, S., Lisin, V., Kondratiev, R., Massone, A.M., Galler, G., Ahrens, J., ...
Compton scattering by the proton has been measured over a wide range covering photon energies 250 MeV lt or approximately=E/sub gamma / lt or approximately=800 MeV and photon scattering angles 30...