Intruder state collectivity at a double subshell closure from the beta decay of 0/sup -/ /sup 96/Y/sup g/ to the levels of /sup 96/Zr
Levels of /sup 96/Zr populated following the ..beta../sup -/ decay of the 0/sup -/ ground state of /sup 96/Y have been investigated by ..gamma..-ray and conversion electron singles, ..gamma..-ray multispectral scaling, ..gamma..-..gamma.. and ..gamma..-e/sup -/ coincidence, and ..gamma..-..gamma.. angular correlation measurements. These data have been used to establish the population of eight excited levels of /sup 96/Zr, to confirm the 0/sup +/ assignment of the 2695-keV level, and to determine a half-life of 5.4(1) s for /sup 96/Y. The deduced beta transition strengths establish the decay to the ground state, with logft of 5.6, as one of the fastest first-forbidden decays known and support the notion of double subshell closure at Z = 40 and N = 56. The observed strong hindrance of transitions to excited 0/sup +/ states is indicative of shape coexistence. The observed level pattern of the band built on the 0/sub 2//sup +/ state exhibits similarities to nearby vibrational-like nuclei having four valence protons and four valence neutrons. A four-particle, four-hole interpretation of the 0/sub 2//sup +/ state is supported by the data, and we determine a deformation parameter, ..beta../sub 2/approx.0.2, for this intruder bandhead.
- Research Organization:
- Clark University, Worcester, Massachusetts 01610, Brookhaven National Laboratory, Upton, New York 11973, University of Maryland, College Park, Maryland 20742
- DOE Contract Number:
- AC02-79ER10493
- OSTI ID:
- 5581749
- Journal Information:
- Phys. Rev. C; (United States), Vol. 37:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
YTTRIUM 96
BETA-MINUS DECAY
ZIRCONIUM 96
ENERGY LEVELS
ANGULAR CORRELATION
COINCIDENCE SPECTROMETRY
FORBIDDEN TRANSITIONS
FT VALUE
GAMMA SPECTRA
HALF-LIFE
NUCLEAR DEFORMATION
PARITY
SHELL MODELS
SPIN
THERMAL FISSION
URANIUM 235 TARGET
VALENCE
ANGULAR MOMENTUM
BARYON REACTIONS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CORRELATIONS
DECAY
DEFORMATION
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
FISSION
HADRON REACTIONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
MATHEMATICAL MODELS
MINUTES LIVING RADIOISOTOPES
NEUTRON REACTIONS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
ODD-ODD NUCLEI
PARTICLE PROPERTIES
RADIOISOTOPES
SPECTRA
STABLE ISOTOPES
TARGETS
YTTRIUM ISOTOPES
ZIRCONIUM ISOTOPES
651720* - Nuclear Properties & Reactions
A=90-149
Experimental