Discovery of a nonyrast K{sup {pi}}=8{sup +} isomer in {sup 162}Dy, and the influence of competing K-mixing mechanisms on its highly forbidden decay
- Department of Physics, University of Surrey, Guildford, Surrey GU2 7XH (United Kingdom)
- Department of Nuclear Physics, RSPhysSE, Australian National University, Canberra ACT0200 (Australia)
The {sup 160}Gd({sup 9}Be,{alpha}3n){sup 162}Dy reaction has been used to study high-spin states in {sup 162}Dy. Pulsed beam conditions were utilized for enhanced isomer sensitivity. An isomer at 2188.1(3) keV with a half-life of 8.3(3) {mu}s has been discovered and assigned K{sup {pi}}= 8{sup +} with a two-quasineutron configuration. Among 11 {gamma}-ray decay branches, an E2, {Delta}K=8 transition to the ground-state band was observed with a reduced hindrance of f{sub {nu}}=35, agreeing well with systematics correlating f{sub {nu}} with the product of the valence neutron and proton numbers (N{sub p}N{sub n}) over an extended N,Z range. Small deviations from N{sub p}N{sub n} dependence are analyzed for a range of two-quasiparticle isomer decays and interpreted as arising from a weak dependence on the isomer excitation energy relative to the yrast line.
- OSTI ID:
- 21499491
- Journal Information:
- Physical Review. C, Nuclear Physics, Journal Name: Physical Review. C, Nuclear Physics Journal Issue: 3 Vol. 83; ISSN 0556-2813; ISSN PRVCAN
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALPHA DECAY
BARYONS
BEAMS
BERYLLIUM 9 REACTIONS
CONFIGURATION
DECAY
DYSPROSIUM 162
DYSPROSIUM ISOTOPES
ELECTROMAGNETIC RADIATION
ELEMENTARY PARTICLES
EMISSION
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-EVEN NUCLEI
EXCITATION
FERMIONS
GADOLINIUM 160 TARGET
GAMMA RADIATION
HADRONS
HALF-LIFE
HEAVY ION REACTIONS
HIGH SPIN STATES
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
ISOMERS
ISOTOPES
KEV RANGE
MIXING
NEUTRON EMISSION
NEUTRONS
NUCLEAR DECAY
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
PROTONS
RADIATIONS
RARE EARTH NUCLEI
SENSITIVITY
STABLE ISOTOPES
TARGETS
YRAST STATES