ANGULAR DISTRIBUTIONS OF FRAGMENTS FROM NEUTRON-INDUCED FISSION OF U$sup 233$ AND Pu$sup 23$$sup 9$
Angular distributions of fragment activities from neutron-induced fission of U/sup 233/ and Pu/sup 239/ were measured and show in detail the energy dependence of these distributions. The theoretically expected difference in lowenergy- anisotropy for these nuclides, which have similar fission thresholds but significantly different target spins, was not observed. A statistical model of fission anisotropyis applied to the data from the low-spin target Pu/sup 239/ to determine the energy dependence of K/sup 0/, the standard deviation of the distribution in the angular-momentum projection on the nuclear symmetry axis. The anisotropies indicate an increase of K/sub 0/ with energy in excess of the fission barrier, with K/sub 0/ values for even-even fissioning nuclei at excitation energies approximately 1 Mev higher than those for odd-A nuclei. The effective moment of inertia about the symmetry axis, similarly obtained from application of a statistical model to the data, is found to be approximately 0.1 that of a rigid spherical nucleus. (auth)
- Research Organization:
- Los Alamos Scientific Lab., N. Mex.
- NSA Number:
- NSA-14-004807
- OSTI ID:
- 4220086
- Journal Information:
- Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D, Journal Name: Physical Review (U.S.) Superseded in part by Phys. Rev. A, Phys. Rev. B: Solid State, Phys. Rev. C, and Phys. Rev. D Vol. Vol: 116; ISSN PHRVA
- Country of Publication:
- Country unknown/Code not available
- Language:
- English
Similar Records
ANISOTROPY OF THE FISSION FRAGMENTS FROM Pu$sup 240$ AND Pu$sup 23$$sup 9$
TIME-OF-FLIGHT FISSION STUDIES ON U$sup 233$, U$sup 235$, AND Pu$sup 23$$sup 9$
Related Subjects
ANGULAR DISTRIBUTION-- FISSION PRODUCTS-- MEASURED VALUES-- NEUTRONS-- PLUTONIUM 239
ANGULAR DISTRIBUTION-- FISSION PRODUCTS-- MEASURED VALUES-- NEUTRONS-- URANIUM 233
ANGULAR DISTRIBUTION-- FISSION PRODUCTS-- MEASURED VALUES-- NUCLEAR MODELS-- PLUTONIUM 239-- SPIN-- STATISTICS-- TARGETS is
PHYSICS