Shape coexistence effects and quasiparticle alignment in /sup 81/Sr
High spin states in /sup 81/Sr were investigated in the reactions /sup 56/Fe(/sup 28/Si,2pn) at 103.6 MeV and /sup 55/Mn(/sup 29/Si,p2n) at 95.2 MeV using the techniques of in-beam ..gamma..-ray spectroscopy. Measurements were made of ..gamma..-..gamma.. coincidences and ..gamma..-ray directional correlations from oriented nuclei. The lifetimes of 12 states and lifetime limits of 10 others were determined with the Doppler shift attenuation method. The data have been analyzed in terms of the Woods-Saxon cranking model. The first crossing observed in the yrast band is attributed to the alignment of a pair of g/sub 9/2/ protons. The irregularities observed in the J/sup (2)/ moment of inertia in the K/sup ..pi../ = (5/2/sup -/ and 1/2/sup (+)/ bands are interpreted as evidence for the alignment of a g/sub 9/2/ proton pair as well. The coexistence of prolate and oblate configurations at low spin is discussed in terms of the polarization of the soft even-even core by the odd neutron.
- Research Organization:
- Department of Physics, Florida State University, Tallahassee, Florida 32306
- OSTI ID:
- 6853385
- Journal Information:
- Phys. Rev. C; (United States), Vol. 38:2
- Country of Publication:
- United States
- Language:
- English
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IRON 56 REACTIONS
HEAVY ION FUSION REACTIONS
MANGANESE 55 REACTIONS
SILICON 28 TARGET
SILICON 29 TARGET
STRONTIUM 81
HIGH SPIN STATES
CRANKING MODEL
GAMMA SPECTROSCOPY
IN-BEAM SPECTROSCOPY
LIFETIME
MEV RANGE 10-100
MEV RANGE 100-1000
NEUTRONS
PROTONS
ALKALINE EARTH ISOTOPES
BARYONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
EVEN-ODD NUCLEI
FERMIONS
HADRONS
HEAVY ION REACTIONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
MATHEMATICAL MODELS
MEV RANGE
MINUTES LIVING RADIOISOTOPES
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
RADIOISOTOPES
SPECTROSCOPY
STRONTIUM ISOTOPES
TARGETS
651620* - Nuclear Properties & Reactions
A=59-89
Experimental