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Gamow-Teller strength function for /sup 90/Zr: Effects of spin and isospin exchange forces, and ground-state correlations

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

Shell-model calculations of the Gamow-Teller strength function for /sup 90/Zr have been performed utilizing a realistic finite-range two-body interaction in a model space consisting of the 2p and 1g shells. The effects of admixtures of two-particle two-hole excitations in /sup 90/Nb, mostly due to the spin and isospin exchange components of the nucleon-nucleon force, are discussed. Ground state correlations in /sup 90/Zr are also added via seniority-zero two-proton excitations from the 2p shell into the 1g/sub 9/2/ shell. With the correlations the Gamow-Teller strength function is in good agreement with the experimental results and accounts for essentially all of the observed dispersion of strength. The inclusion of these correlations does not, however, produce either a displacement of Gamow-Teller strength to higher excitation energies, or a significant change in the total strength. Thus, they cannot account for the observed Gamow-Teller quenching. The quenching factor derived by a comparison of our calculated results with experiment is 0.52.

Research Organization:
University of California, Lawrence Livermore National Laboratory, Livermore, California 94550
OSTI ID:
5665200
Journal Information:
Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 28:3; ISSN PRVCA
Country of Publication:
United States
Language:
English

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Related Subjects

651713* -- Nuclear Properties & Reactions
A=90-149
Theoretical-- Energy Levels & Transitions-- (-1987)
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
BARYON REACTIONS
BARYONS
BETA DECAY
CHARGE-EXCHANGE REACTIONS
CHARGED-PARTICLE REACTIONS
CORRELATIONS
DECAY
ELEMENTARY PARTICLES
EVEN-EVEN NUCLEI
FERMIONS
FUNCTIONS
GAMOW-TELLER RULES
HADRON REACTIONS
HADRONS
INTERMEDIATE MASS NUCLEI
ISOMERIC TRANSITION ISOTOPES
ISOSPIN
ISOTOPES
MANY-BODY PROBLEM
MATHEMATICAL MODELS
NEUTRONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEAR STRUCTURE
NUCLEI
NUCLEON REACTIONS
NUCLEONS
PARTICLE PROPERTIES
PARTICLE-HOLE MODEL
PROTON REACTIONS
RADIOISOTOPES
SHELL MODELS
SPIN EXCHANGE
STABLE ISOTOPES
STRENGTH FUNCTIONS
TWO-BODY PROBLEM
WAVE FUNCTIONS
ZIRCONIUM 90
ZIRCONIUM ISOTOPES