Non-equilibrium processes in p + Ag collisions at GeV energies

M. Fidelus, D. Filges, F. Goldenbaum, L. Jarczyk, B. Kamys, M. Kistryn, St. Kistryn, E. Kozik, P. Kulessa, H. Machner, A. Magiera, B. Piskor-Ignatowicz, K. Pysz, Z. Rudy, Sushil K. Sharma, R. Siudak, and M. Wojciechowski (PISA Collaboration)
Phys. Rev. C 96, 064618 – Published 27 December 2017

Abstract

The double differential spectra d2σ/dΩdE of p, d, t, He3,4,6, Li6,7,8,9, Be7,9,10, and B10,11,12 were measured at seven scattering angles, 15.6, 20, 35, 50, 65, 80, and 100, in the laboratory system for proton induced reactions on a silver target. Measurements were done for three proton energies: 1.2, 1.9, and 2.5 GeV. The experimental data were compared to calculations performed by means of two-step theoretical microscopic models. The first step of the reaction was described by the intranuclear cascade model incl4.6 and the second one by four different models (ABLA07, GEM2, gemini++, and SMM) using their standard parameter settings. Systematic deviations of the data from predictions of the models were observed. The deviations were especially large for the forward scattering angles and for the kinetic energy of emitted particles in the range from about 50 to 150 MeV. This suggests that some important non-equilibrium mechanism is lacking in the present day microscopic models of proton-nucleus collisions in the studied beam energy range.

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  • Received 18 August 2017

DOI:https://doi.org/10.1103/PhysRevC.96.064618

©2017 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

M. Fidelus1, D. Filges2,3, F. Goldenbaum2,3, L. Jarczyk1, B. Kamys1,*, M. Kistryn4, St. Kistryn1, E. Kozik4, P. Kulessa4, H. Machner5, A. Magiera1, B. Piskor-Ignatowicz1,2,3, K. Pysz4, Z. Rudy1, Sushil K. Sharma1,2,3, R. Siudak4, and M. Wojciechowski1 (PISA Collaboration)

  • 1M. Smoluchowski Institute of Physics, Jagiellonian University, Łojasiewicza 11, 30348 Kraków, Poland
  • 2Jülich Center for Hadron Physics, Forschungszentrum Jülich, 52425 Jülich, Germany
  • 3Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany
  • 4H. Niewodniczański Institute of Nuclear Physics PAN, Radzikowskiego 152, 31342 Kraków, Poland
  • 5Universität Duisburg-Essen, Fakultät für Physik, Lotharstrasse 1, 47048 Duisburg, Germany

  • *Corresponding author: ufkamys@cyf-kr.edu.pl

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Vol. 96, Iss. 6 — December 2017

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