ANGULAR DISTRIBUTIONS FROM HEAVY-ION-INDUCED FISSION (thesis)
Angular distributions of fission fragments from heavyion-induced nuclear reactions were studied. Targets of /sub 7//sub 9/Au/sup 1//sup 9//sup 7/ and / sub 8//sub 3/Bi/sup 2//sup 0//sup 9/ were bombarded wit h /sub 6/C/sup 1//sup 2/ / sub 7/N/sup 1//sup 4/ and /sub 8/O/sup 1//sup 6/ ions at energies of plus or minus 5.5to 10.4 Mev per nucleon. Both targets were also studied with /sub 5/B/ sup 1//sup 1/ at the maximum energy. It was observed that the ratio of 0 to 90 deg differential cross sections is much larger for heavy ions than for lighter projectiles. For a given heavy ion, this anisotropy was found to increase with bombarding energy and decrease with the value of Z/sup 2//A of the compound nucleus. There was no distinct evidence for a monotonic relationship between the anisotropy and the mass of the projectile. In this respect, nitrogen was characterized by somewhat lower anisotropies than the other ions. The data were interpreted within the theoretical framework proposed by Halpern and Strutinski and by Griffin to explain fission-fragment angular distributions at moderate energies. In general. these results can be described in terms of the large angular momenta and excitation energies associated with heavy-ion reactions. It is suggested that, on the average, the number of neutrons that are evaporated before fission increases as the atomic number of the compound nucleus decreases. (auth)
- Research Organization:
- California Univ., Berkeley, CA (US). Lawrence Radiation Lab.
- DOE Contract Number:
- W-7405-ENG-48
- NSA Number:
- NSA-15-021528
- OSTI ID:
- 4074766
- Report Number(s):
- UCRL-9619
- Country of Publication:
- United States
- Language:
- English
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