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Symmetry of neutron-induced 235U fission at individual resonances. III

Abstract

A number of experiments have been described in recent years which document variations in the yields of symmetric or near-symmetric fission products at resonances in 235-U and 239-Pu neutron-induced fission. In the case of 239-Pu fission it has been demonstrated in a statistically significant sample of s-wave neutron resonances (J{sup {pi}} = 0{sup +} or 1{sup +}) that the 0{sup +} levels have a characteristic 115Cd yield which is a factor of four higher than the yield at 1{sup +} levels. The fission widths of the J = 0 levels are larger than the J = 1 levels by a factor of ten. The populations of the two groups are in reasonable agreement with the expected (2J + 1) distributions. Previous efforts to obtain equally detailed data in 235-U fission and 233-U fission by the 'wheel' technique have not been entirely successful due in large part to the high level densities in the epithermal excitation functions of these nuclides and the consequent difficulty in characterizing fission yields in a sufficiently large and well-resolved sample of levels. In a recent 'wheel' experiment (late summer, 1969) vith a 235-U target the energy resolution was sufficiently improved in the region 20 eV-60 eV  More>>
Authors:
Cowan, G A; Bayhurst, B P; Prestwood, R J; Gilmore, J S; Knobeloch, G W [1] 
  1. Los Alamos Scientific Laboratory, University of California, Los Alamos, NM (United States)
Publication Date:
May 15, 1970
Product Type:
Conference
Report Number:
CONF-700101(vol.2); INIS-XA-N-229
Resource Relation:
Conference: Symposium on engineering with nuclear explosives, Las Vegas, NV (United States), 14-16 Jan 1970; Other Information: 9 refs, 4 figs, 3 tabs; Related Information: In: Symposium on engineering with nuclear explosives. Proceedings. Volume 2, 935 pages.
Subject:
42 ENGINEERING; ENERGY RESOLUTION; EXPERIMENTAL DATA; FISSION; FISSION PRODUCTS; LEVEL WIDTHS; NUCLEAR REACTION YIELD; PLUTONIUM 239; URANIUM 233; URANIUM 235
OSTI ID:
20768839
Research Organizations:
American Nuclear Society, Hindsdale, IL (United States); United States Atomic Energy Commission (United States)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
TRN: XA04N0910075306
Availability:
Available from INIS in electronic form
Submitting Site:
INIS
Size:
page(s) 1306-1314
Announcement Date:
Sep 23, 2006

Citation Formats

Cowan, G A, Bayhurst, B P, Prestwood, R J, Gilmore, J S, and Knobeloch, G W. Symmetry of neutron-induced 235U fission at individual resonances. III. IAEA: N. p., 1970. Web.
Cowan, G A, Bayhurst, B P, Prestwood, R J, Gilmore, J S, & Knobeloch, G W. Symmetry of neutron-induced 235U fission at individual resonances. III. IAEA.
Cowan, G A, Bayhurst, B P, Prestwood, R J, Gilmore, J S, and Knobeloch, G W. 1970. "Symmetry of neutron-induced 235U fission at individual resonances. III." IAEA.
@misc{etde_20768839,
title = {Symmetry of neutron-induced 235U fission at individual resonances. III}
author = {Cowan, G A, Bayhurst, B P, Prestwood, R J, Gilmore, J S, and Knobeloch, G W}
abstractNote = {A number of experiments have been described in recent years which document variations in the yields of symmetric or near-symmetric fission products at resonances in 235-U and 239-Pu neutron-induced fission. In the case of 239-Pu fission it has been demonstrated in a statistically significant sample of s-wave neutron resonances (J{sup {pi}} = 0{sup +} or 1{sup +}) that the 0{sup +} levels have a characteristic 115Cd yield which is a factor of four higher than the yield at 1{sup +} levels. The fission widths of the J = 0 levels are larger than the J = 1 levels by a factor of ten. The populations of the two groups are in reasonable agreement with the expected (2J + 1) distributions. Previous efforts to obtain equally detailed data in 235-U fission and 233-U fission by the 'wheel' technique have not been entirely successful due in large part to the high level densities in the epithermal excitation functions of these nuclides and the consequent difficulty in characterizing fission yields in a sufficiently large and well-resolved sample of levels. In a recent 'wheel' experiment (late summer, 1969) vith a 235-U target the energy resolution was sufficiently improved in the region 20 eV-60 eV to allow characterization of a sample of 38 reasonably well-resolved levels by their relative symmetry of fission. (author)}
place = {IAEA}
year = {1970}
month = {May}
}