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Spin-state determinations and spacings of neutron resonances for /sup 187/Os and /sup 189/Os

Journal Article · · Phys. Rev., C; (United States)
; ;
The spin states of 25 resonances for (/sup 187/Os + n) and 40 resonances for (/sup 189/Os + n) have been determined with probabilities of correctness greater than 80%. Spin assignments were made on the basis of the ratios of low-energy ..gamma..-ray intensities associated with neutron capture in the resonances. For both nuclei, the spin distributions are consistent with a (2J + 1) level-density distribution. The level spacings favor the theory of Dyson and Mehta, but an uncorrelated Wigner distribution cannot be ruled out definitely. These results provide important input parameters for the astrophysical determination of the age of the universe by the /sup 187/Re ..-->.. /sup 187/Os nuclear dating technique. (AIP)
Research Organization:
Naval Research Laboratory, Washington, D. C. 20375
OSTI ID:
7342529
Journal Information:
Phys. Rev., C; (United States), Journal Name: Phys. Rev., C; (United States) Vol. 14:3; ISSN PRVCA
Country of Publication:
United States
Language:
English

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Related Subjects

651823 -- Nuclear Properties & Reactions
A=150-189
Experimental-- Energy Levels & Transitions-- (-1987)
651825* -- Nuclear Properties & Reactions
A=150-189
Experimental-- Nuclear Reactions & Scattering-- (-1987)
651923 -- Nuclear Properties & Reactions
A=190-219
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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ANGULAR MOMENTUM
BARYON REACTIONS
CAPTURE
DAYS LIVING RADIOISOTOPES
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EV RANGE
EVEN-EVEN NUCLEI
GAMMA CASCADES
HADRON REACTIONS
HEAVY NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
MINUTES LIVING RADIOISOTOPES
NEUTRON REACTIONS
NUCLEAR CASCADES
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
OSMIUM 187 TARGET
OSMIUM 188
OSMIUM 189 TARGET
OSMIUM 190
OSMIUM ISOTOPES
PARTICLE PROPERTIES
RADIOISOTOPES
SPIN
STABLE ISOTOPES
TARGETS