Computer Science
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phdt........69t&link_type=abstract
Thesis (PH.D.)--MICHIGAN STATE UNIVERSITY, 1990.Source: Dissertation Abstracts International, Volume: 51-09, Section: B, page: 4
Computer Science
Scientific paper
The production of high energy gamma rays (E _gamma > 20 MeV) was studied using three Cherenkov telescopes. Each telescope consists of a BaF_2 active converter placed in front of the Cherenkov counter stack. The efficiency and the energy response of the detector were calibrated at the University of Illinois tagged photon facility. The efficiency of the telescope ranges from about 10% for 20 MeV photons to 20% for 80 MeV photons. The detector energy resolution varies from 30% FWHM at 20 MeV to 45% at 80 MeV. Photon production from the following light-ion induced reactions were studied: ^4He + C, ^4He + Zn and ^4 He + Pb at energies E/A = 25 MeV and 53 MeV; and ^2H + C, ^2H + Zn and ^2 + Pb at E/A = 53 MeV. The photon double differential cross sections are exponentially decreasing with increased energy. The slope parameters are steeper than those found in heavy-ion induced reactions at similar energies. The angular distributions in the nucleon-nucleon center-of-mass have larger dipole components than in heavy-ion induced reactions. We observed both target and projectile dependence in the slope parameters and angular distributions. Calculations based on first -chance neutron-proton bremsstrahlung model was able to reproduce the projectile dependence of the slope parameters. Photon production from the following 30 MeV/nucleon heavy-ion induced reactions were also studied: symmetric systems ^7Li + Li, ^ {20}Ne + Mg and ^{40 }Ar + Ca and the asymmetric systems ^7Li + Pb and ^{40} Ar + Pb. The energy spectra and the angular distributions are quite similar to those observed in earlier experiments. The ratios of total cross section for systems having different masses agree with predictions of the first-chance n-p bremsstrahlung model.
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