High energy gamma ray production in proton-induced reactions at 104, 145, and 195 MeV

J. Clayton, W. Benenson, M. Cronqvist, R. Fox, D. Krofcheck, R. Pfaff, T. Reposeur, J. D. Stevenson, J. S. Winfield, B. Young, M. F. Mohar, C. Bloch, and D. E. Fields
Phys. Rev. C 45, 1815 – Published 1 April 1992
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Abstract

Energy spectra and angular distributions have been measured for high energy gamma rays (Eγ≥20 MeV) from proton-nucleus reactions at 104, 145, and 195 MeV on targets of C, Zn, and Pb. Gamma rays were observed with energies up to 170 MeV. The spectra showed differences from the typical exponential shape that is observed in gamma ray production from heavy-ion reactions. The angular distribution of the gamma ray is forward peaked in the laboratory, which is consistent with emission from a moving source. A comparison is made with previous measurements at 72, 140, 168, and 200 MeV. The experimental evidence indicates that first-chance incoherent proton-neutron bremsstrahlung is the main production mechanism.

  • Received 22 August 1991

DOI:https://doi.org/10.1103/PhysRevC.45.1815

©1992 American Physical Society

Authors & Affiliations

J. Clayton, W. Benenson, M. Cronqvist, R. Fox, D. Krofcheck, R. Pfaff, T. Reposeur, J. D. Stevenson, J. S. Winfield, and B. Young

  • National Superconducting Cyclotron Laboratory and Department of Physics Astronomy, Michigan State University, East Lansing, Michigan 48824

M. F. Mohar

  • National Superconducting Cyclotron Laboratory and Department of Chemistry, Michigan State University, East Lansing, Michigan 48824

C. Bloch and D. E. Fields

  • Indiana University Cyclotron Facility, Bloomington, Indiana 47405

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Vol. 45, Iss. 4 — April 1992

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