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Microscopic theory of photon production in proton-nucleus and nucleus-nucleus collisions
Institution:1. State Key Laboratory of Organic−Inorganic Composites, Beijing University of Chemical Technology, Beijing, 100029, China;2. Beijing Advanced Innovation Center for Soft Matter Science and Engineering, Beijing University of Chemical Technology, Beijing, 100029, China;1. Institute for Theoretical Particle Physics and Cosmology (TTK), RWTH Aachen University, D-52056 Aachen, Germany;2. Institutt for Fysikk, NTNU, Trondheim, Norway;1. Physik-Institut, University of Zurich, CH 8057 Zürich, Switzerland;2. Albert Einstein Center for Fundamental Physics, Institute for Theoretical Physics, University of Bern, Bern 3012, Switzerland;1. University of California, Berkeley Space Sciences Laboratory, USA;2. Energetic Cosmos Laboratory, Nazarbayev University, Kazakhstan;3. University of Texas at Austin, USA;4. Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong;5. Université Sorbonne Paris Cité, Laboratoire APC-PCCP, France;6. University of California, Berkeley, Department of Physics, USA;7. Lawrence Berkeley National Laboratory, USA;1. Uppsala Universitet, Box 516, SE 75120, Uppsala, Sweden;2. European Organization for Nuclear Research (CERN), Gèneve, Switzerland;3. Università di Trieste, Via Valerio 2, 34127 Trieste, Italy;4. INFN Trieste, Padriciano 99, 34149 Trieste, Italy;5. Institut für Kernphysik, TU-Darmstadt, Schlossgartenstr. 9, D-64289 Darmstadt, Germany;6. Phys. Dept. and CMNST, University of Rijeka, R. Matejcic 2, Rijeka, Croatia;7. Center for Axion and Precision Physics Research (IBS), Daejeon 305-701, Republic of Korea;8. Department of Physics, KAIST, Daejeon 305-701, Republic of Korea;9. Physics Department, University of Wisconsin–Madison, 1150 University Avenue, Madison, WI 53706, USA;10. University of Patras, GR 26504 Patras, Greece
Abstract:The production of energetic photons in medium-energy proton and heavy-ion induced reactions is studied on the basis of incoherent nucleon-nucleon collisions. For this purpose we first evaluate covariantly the photon production from proton-neutron collisions in a vector (ω) and scalar meson (σ) exchange model with coupling constants given by the M2Y G-matrix in the nonrelativistic limit. We furthermore follow the proton-neutron collisional history by means of a phase-space simulation based on the Boltzmann-Uehling-Uhlenbeck approach for proton-nucleus and nucleus-nucleus collisions adding up incoherently the yields from each individual collision. The satisfactory agreement we obtain in comparison with experimental data allows to conclude that energetic photons predominantly arise from proton-neutron bremsstrahlung during the early stage of the collision.
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