Status report of the NuMoon experiment (2008)
Scholten, O., Buitink, S., Bacelar, J., Braun, R., De Bruyn, A. G., Falcke, H., ...
We show that at wavelengths comparable to the length of the shower produced by an Ultra-High Energy cosmic ray or neutrino, radio signals are an extremely efficient way to detect these particles....
The NuMoon experiment: first results (2008)
Buitink, S., Bacelar, J., Braun, R., De Bruyn, G., Falcke, H., Scholten, O., ...
The NuMoon project uses the Westerbork Synthesis Radio Telescope to search for short radio pulses from the Moon. These pulses are created when an ultra high energy cosmic ray or neutrino initiates a...
Photoproduction of eta meson within a coupled-channels K-matrix approach (2008)
We investigate photoproduction of eta mesons off protons and neutrons within a coupled-channels effective-Lagrangian method which is based on the K-matrix approach. The two-body final channels...
Allard, D., Armengaud, E., Aublin, J., Beau, T., Berat, C., Billoir, P., ...
The surface detector array of the Pierre Auger Observatory is sensitive to Earth-skimming tau-neutrinos $\nu_\tau$ that interact in the Earth's crust. Tau leptons from $\nu_\tau$ charged-current...
Allard, D., Armengaud, E., Aublin, J., Beau, T., Berat, C., Billoir, P., ...
The surface detector array of the Pierre Auger Observatory is sensitive to Earth-skimming tau-neutrinos $\nu_\tau$ that interact in the Earth's crust. Tau leptons from $\nu_\tau$ charged-current...
Allard, D., Armengaud, E., Aublin, J., Beau, T., Berat, C., Billoir, P., ...
The surface detector array of the Pierre Auger Observatory is sensitive to Earth-skimming tau-neutrinos $\nu_\tau$ that interact in the Earth's crust. Tau leptons from $\nu_\tau$ charged-current...
A Macroscopic Description of Coherent Geo-Magnetic Radiation from Cosmic Ray Air Showers (2007)
Scholten, O., Werner, K., Rusydi, F.
We have developed a macroscopic description of coherent electro-magnetic radiation from air showers initiated by ultra-high energy cosmic rays due to the presence of the geo-magnetic field. This...
Anisotropy studies around the galactic centre at EeV energies with the Auger Observatory (2007)
Abraham, J., Aglietta, M., Aguirre, C., Allard, D., Allekotte, I., Allison, P., ...
Data from the Pierre Auger Observatory are analyzed to search for anisotropies near the direction of the Galactic Centre at EeV energies. The exposure of the surface array in this part of the sky is...
Abraham, J., Aglietta, M., Aguirre, C., Allard, D., Allekotte, I., Allison, P., ...
An upper limit of 16% (at 95% c.l.) is derived for the photon fraction in cosmic rays with energies greater than $10^{19}$ eV, based on observations of the depth of shower maximum performed with the...
Stappers, B., Falcke, H., Bruyn, A. G. De, Braun, R., Bacelar, J., Scholten, O., ...
Abstract: We show that at wavelengths comparable to the length of the shower produced by an Ultra-High Energy cosmic ray or neutrino, radio signals are an extremely efficient way to detect these...
Detecting UHE Cosmics & Neutrinos off the Moon; an Optimal Radio Window (2006)
Scholten, O., Bacelar, J., Braun, R., De Bruyn, A. G., Falcke, H., Stappers, B., ...
We show that at wavelengths comparable to the length of the shower produced by an Ultra-High Energy cosmic ray or neutrino, radio signals are an extremely efficient way to detect these particles....
Channel coupling effects in $\rho$-meson photoproduction (2006)
We investigate $\rho$-meson photoproduction in a coupled-channels formulation. It is shown that channel coupling effects are large and account for discrepancies observed in several single-channel...
Scholten, O., Bacelar, J., Braun, R., Bruyn, A.G. De, Falcke, H., Stappers, B., ...
When high-energy cosmic rays impinge on a dense dielectric medium, radio waves are produced through the Askaryan effect. We show that at wavelengths comparable to the length of the shower produced by...
Scholten, O., Bacelar, J., Braun, R., De Bruyn, A. G., Falcke, H., Stappers, B., ...
When high-energy cosmic rays impinge on a dense dielectric medium, radio waves are produced through the Askaryan effect. We show that at wavelengths comparable to the length of the shower produced by...
K-Lambda and K-Sigma photoproduction in a coupled channels framework (2005)
A coupled channels analysis, based on the K-matrix approach, is presented for photo-induced kaon production. It is shown that channel coupling effects are large and should not be ignored. The...
Patterns of the ground states in the presence of random interactions: nucleon systems (2004)
Zhao, Y. M., Arima, A., Shimizu, N., Ogawa, K., Yoshinaga, N., Scholten, O.
We present our results on properties of ground states for nucleonic systems in the presence of random two-body interactions. In particular we present probability distributions for parity, seniority,...
Kondratyuk, S., Kubodera, K., Myhrer, F., Scholten, O.
The Adler-Weisberger and Goldberger-Miyazawa-Oehme sum rules are calculated within a relativistic, unitary and crossing symmetric dynamical model for pion-nucleon scattering using two different...
Corrections to the Born approximation in photo-induced strangeness production off a proton are calculated in a semi-realistic microscopic model. The vertex corrections and internal contributions to...
Compton Scattering on the Proton (2002)
A microscopic coupled-channels model for Compton and pion scattering off the nucleon is introduced which is applicable at the lowest energies (polarizabilities) as well as at GeV energies. To...
Virtual-pion and two-photon production in pp scattering (2002)
Two-photon production in pp scattering is proposed as a means of studying virtual-pion emission. Such a process is complementary to real-pion emission in pp scattering. The virtual-pion signal is...
Covariant model for proton-proton bremsstrahlung: comparison with high precision data (2002)
Cozma, M.D., Martinus, G.H., Scholten, O., Timmermans, R.G.E., Tjon, J.A.
Covariant model for proton-proton bremsstrahlung : Comparison with high-precision data (2001)
Scholten, O, Martinus, G. H., Cozma, M. D., Tjon, J. A.
Published in: Phys. Rev., C 65 (2002) 024001 citations recorded in [Science Citation Index] Abstract: We compare a relativistic covariant model for proton-proton bremsstrahlung with high-quality data...
Covariant model for proton-proton bremsstrahlung: Comparison with high-precision data (2001)
Cozma, M. D., Martinus, G. H., Scholten, O., Timmermans, R. G. E., Tjon, J. A.
We compare a relativistic covariant model for proton-proton bremsstrahlung with high-quality data from KVI. The agreement in large parts of phase space is satisfactory. However, remarkably large...
Coherent Compton scattering on light nuclei in the delta resonance region (2001)
Van Daele, L., Korchin, A. Yu., Van Neck, D., Scholten, O., Waroquier, M.
Coherent Compton scattering on light nuclei in the delta resonance region is studied in the impulse approximation and is shown to be a sensitive probe of the in-medium properties of the delta...
Low-energy Compton scattering on the nucleon and sum rules (2001)
The Gerasimov-Drell-Hearn and Baldin-Lapidus sum rules are evaluated in the dressed K-matrix model for photon-induced reactions on the nucleon. For the first time the sum $\alpha+\beta$ of the...
A microscopic calculation of Compton scattering on the nucleon is presented which encompasses the lowest energies -- yielding nucleon polarizabilities -- and extends to energies of the order of 600...
Photoproduction of electron-positron pairs on the proton in the resonance region (2000)
Production of lepton pairs in gamma p -> e-e+ p reaction is studied at photon energies up to 1 GeV. We show that even if lepton charge is not measured there are extensive kinematical regimes where...
Compton scattering in a unitary approach with causality constraints (2000)
Pion-loop corrections for Compton scattering are calculated in a novel approach based on the use of dispersion relations in a formalism obeying unitarity. The basic framework is presented, including...
Dressing the nucleon in a dispersion approach (2000)
We present a model for dressing the nucleon propagator and vertices. In the model the use of a K-matrix approach (unitarity) and dispersion relations (analyticity) are combined. The principal...
Compton scattering in a unitary approach with causality constraints (2000)
Abstract: Pion-loop corrections for Compton scattering are calculated in a novelapproach based on the use of dispersion relations in a formalism obeyingunitarity. The basic framework is presented,...
Dressing the nucleon in a dispersion approach (2000)
Abstract: We present a model for dressing the nucleon propagator and vertices. In the model the use of a K-matrix approach (unitarity) and dispersion relations (analyticity) are combined. The...
Non-perturbative model for the half-off-shell $gamma N N$ vertex (1999)
Submitted to: Phys. Rev. C Abstract: Form factors in the nucleon-photon vertex with one off-shell nucleon are calculated by dressing the vertex with pion loops up to infinite order. Cutting rules and...
Non-perturbative model for the half-off-shell \gamma N N vertex (1999)
Form factors in the nucleon-photon vertex with one off-shell nucleon are calculated by dressing the vertex with pion loops up to infinite order. Cutting rules and dispersion relations are implemented...
Q^2-Dependence of the Drell-Hearn-Gerasimov integral (1999)
The energy and four-momentum (Q^2) dependence of the photo-absorption cross section on the proton is calculated for helicity -1/2 and -3/2 states. An effective Lagrangian model is used, formulated in...
Janssen, G., Overmars, H., Scholten, O., ...
Handboek interne communicatie (1999)
Scholten, O., Delden, M. Van, Kleijn, F., Koole, A., Vollenhoven, H.
Comma, 11(1), 6-11, 11(2), 2-4, 11(3), 9-12,11(6), 2-3, 11(7), 2-5, 11(9), 6-10
Pion and photon couplings of N* resonances from scattering on the proton (1998)
Korchin, A. Yu., Scholten, O., Timmermans, R. G. E.
Results of a relativistic model for pion- and photon-induced reactions on the proton are presented. The model is crossing symmetric and gauge invariant. The nucleon resonances P_11 (1440), P_11...
Consistent off-shell $pi N N$ vertex and nucleon self-energy (1998)
Published in: Phys. Rev. C 59 (1999) 1070-1080 Citing articles (CrossRef) citations recorded in [Science Citation Index] Abstract: We present a consistent calculation of half-off-shell form factors...
Production of e+e- pairs in proton-deuteron capture to 3He (1998)
Korchin, A. Yu., Van Neck, D., Waroquier, M., Scholten, O., Dieperink, A. E. L.
The process p+d \leftrightarrow 3He + \gamma* at intermediate energies is described using a covariant and gauge-invariant model, and a realistic pd3He vertex. Both photodisintegration of 3He and...
Consistent off-shell $\pi N N$ vertex and nucleon self-energy (1998)
We present a consistent calculation of half-off-shell form factors in the pion-nucleon vertex and the nucleon self-energy. Numerical results are presented. Near the on-shell point the pion-nucleon...