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Parity dependence of the level densities of /sup 53/Cr and /sup 55/Cr at high excitation

Journal Article · · Phys. Rev. C; (United States)
; ;

The neutron total cross sections of /sup 52/Cr and /sup 54/Cr have been measured in the energy range from a few tens of keV to about 900 keV using a neutron time-of-flight technique and a pulsed electron linear accelerator. The nominal resolution of the measurements was about 0.06 ns/m. The total cross-section data have been analyzed using an R-matrix multilevel multichannel code to determine values of the resonance parameters (E/sub 0/, g Gamma/sub n/, and J/sup ..pi../) and to investigate the parity dependence of the level densities of /sup 53/Cr and /sup 55/Cr at high excitation. The distributions of reduced neutron widths for s- and p-wave resonances for each isotope show good agreement with the Porter-Thomas distribution. The values of the ..delta../sub 3/ statistic for the long-range correlation of s-wave resonances for both /sup 52/Cr and /sup 54/Cr are found to be in reasonable agreement with the theoretical prediction of Dyson and Mehta. The values for the ratio D/sub 0//D/sub 1/ for both nuclides are larger than expected from a (2J + 1) level dependence, indicative of a parity dependence of the level densities of /sup 53/Cr and /sup 55/Cr at high excitation. 23 references, 14 figures, 8 tables.

Research Organization:
State Univ. of New York, Albany
DOE Contract Number:
AC05-84OR21400; AC02-76ER02439
OSTI ID:
6689880
Journal Information:
Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 30:6; ISSN PRVCA
Country of Publication:
United States
Language:
English

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Related Subjects

651520* -- Nuclear Properties & Reactions
A=39-58
Experimental
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CHROMIUM 53
CHROMIUM 55
CHROMIUM ISOTOPES
CROSS SECTIONS
DATA
ENERGY DEPENDENCE
ENERGY-LEVEL DENSITY
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
HADRON REACTIONS
INFORMATION
INTERMEDIATE MASS NUCLEI
ISOTOPES
MATRICES
MINUTES LIVING RADIOISOTOPES
NEUTRON REACTIONS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUMERICAL DATA
P WAVES
PARITY
PARTIAL WAVES
PARTICLE PROPERTIES
R MATRIX
RADIOISOTOPES
RESONANCE
S WAVES
STABLE ISOTOPES
TIME-OF-FLIGHT METHOD
TOTAL CROSS SECTIONS