Proton and neutron alignments and transition strengths in the transitional nucleus /sup 81/Rb

Journal Article · Sat Apr 01 04:00:00 EST 1989 · Phys. Rev. C; (United States)

DOI:https://doi.org/10.1103/PhysRevC.39.1359· OSTI ID:6446076

Tabor, S L; Cottle, P D; Gross, C J; Huettmeier, U J; Moore, E F; Nazarewicz, W

High-spin states in /sup 81/Rb were investigated with the /sup 55/Mn(/sup 29/Si, 2pn)/sup 81/Rb reaction using a 95.2 MeV /sup 29/Si beam. ..gamma..-..gamma.. coincidences were measured with three detectors at 23/sup 0/ and +- 100/sup 0/. The yrast and near-yrast rotational bands in /sup 81/Rb have been extended well above the first band crossings, with spin assignments based on the directional correlations of oriented nuclei. The mean lifetimes of many higher levels were measured using the Doppler shift attenuation method. They imply moderate deformations with average transition moments of 2--2.5 eb, except at the sharp band crossing in the negative parity band, where they dip by a factor of 2. The data have been analyzed in terms of the Woods-Saxon cranking model. The crossing observed in the positive-parity band is attributed to the alignment of a g/sub 9/2/ neutron pair. Two negative-parity bands observed above I = (15/2) are suggested to contain (g/sub 9/2/)/sup 2/ neutron and proton pairs, respectively.

• Research Organization: Departmentof Physics, Florida State University, Tallahassee, Florida 32306
• OSTI ID: 6446076
• Journal Information: Phys. Rev. C; (United States), Journal Name: Phys. Rev. C; (United States) Vol. 39:4; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ALKALI METAL ISOTOPES
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BARYONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
COINCIDENCE SPECTROMETRY
COMPOUND-NUCLEUS REACTIONS
CRANKING MODEL
DATA
DEFORMATION
DISTRIBUTION
ELECTROMAGNETIC RADIATION
ELECTRON CAPTURE RADIOISOTOPES
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
EVAPORATION MODEL
EXPERIMENTAL DATA
FERMIONS
GAMMA RADIATION
HADRONS
HEAVY ION REACTIONS
HIGH SPIN STATES
HOURS LIVING RADIOISOTOPES
INFORMATION
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LIFETIME
MANGANESE 55 TARGET
MATHEMATICAL MODELS
MEV RANGE
MEV RANGE 10-100
MINUTES LIVING RADIOISOTOPES
NEUTRONS
NUCLEAR DEFORMATION
NUCLEAR MODELS
NUCLEAR POTENTIAL
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
NUMERICAL DATA
ODD-EVEN NUCLEI
PARITY
PARTICLE PROPERTIES
POTENTIALS
PROTONS
RADIATIONS
RADIOISOTOPES
RUBIDIUM 81
RUBIDIUM ISOTOPES
SILICON 29 REACTIONS
SPIN
TARGETS
WOODS-SAXON POTENTIAL
YRAST STATES