THE EFFECT OF ANGULAR MOMENTUM ON FISSION PROBABILITY (thesis)
Technical Report
·
OSTI ID:4133887
A nuclear emulsion technique was used to determine total fission cross sections in the following heavy-ion bombardments: (C/sup 12/ + Tm/sup 169/; O/ sup 16 + Ho/sup 165/), (O/sup 16/ + Tm/sup 1 69; Ne/sup 20 + Ho/sup 165/), (C/sup 12 + Re/sup 185/; O/sup 16/ + Ta/sup 181/), and (O/sup 16 + Re/sup 185/; Ne/sup 20 + Ta/sup 181/). Each pair of bembardments resulted in the same compound nucleus, and excitation energies could be made equal in the two cases by adjustment of bombarding energies. The ratio of the fission cross section to a calculated compound nucleus formation cross section, sigma /sub f/ sigma /sub c/ , was taken as a meas- ure of fission probability in each bombardment. In most bombardments a larger value of sigma /sub f/ sigma /sub c/ for the heavier ion was associated with a higher angular momentum brought in by that ion. This correlation supported liquid-drop-model calculations which predict that fission should be enhanced because of an effect of angular momentum in lowering the fission barrier. Indirect effects of angular momentum on fission probability through hindrance of neutron and charged-particle emission were taken into account. Values of sigma /sub f/ sigma /sub c/ in the bombardments with full- energy Ne/sup 20/ ions were unexpectedly low. This observation led to consideration of the possibility, suggested by liquid-drop calculations, that compound nucleus formation would be forbidden for very large angular momenta. The effects of including polarization and target nucleus deformation in calculations of sigma /sub c/ and angular momentum are discussed briefly. (auth)
- Research Organization:
- California. Univ., Berkeley. Lawrence Radiation Lab
- DOE Contract Number:
- W-7405-ENG-48
- NSA Number:
- NSA-14-026274
- OSTI ID:
- 4133887
- Report Number(s):
- UCRL-9304
- Country of Publication:
- United States
- Language:
- English
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