Structure of the N = Z +1 nucleus sup 69 Se

Journal Article · Wed Nov 01 04:00:00 EST 1989 · Physical Review (Section) C: Nuclear Physics; (USA)

DOI:https://doi.org/10.1103/PhysRevC.40.2010· OSTI ID:5015522

Arrison, J W; Balamuth, D P; Chapuran, T; Popescu, D G; Gorres, J; Huttmeier, U J ^[1]

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1. Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania 19104 (USA)

Charged-particle-{gamma} and charged-particle-neutron-{gamma} coincidences have been used to identify in-beam {gamma}-ray transitions in {sup 69}Se produced in the reaction {sup 40}Ca({sup 32}S,2{ital pn}){sup 69}Se. Charged-particle-{gamma}-{gamma} coincidences, neutron-{gamma}-{gamma} coincidences, and neutron-gated {gamma}-ray angular distributions were used to deduce the level scheme. A long-lived isomer attributed to the {ital g}{sub 9/2} state was found; its half-life was measured with charged-particle-{gamma} timing as 1023{plus minus}110 ns. The presence of strong {Delta}{ital J}=1 and {Delta}{ital J}=2 transitions in the band built on the {nu}{ital g}{sub 9/2} neutron single-particle state and the measured sign of the {ital E}2/{ital M}1 mixing ratio for the (11/2{sup +}){r arrow}(9/2{sup +}) transition are consistent with a theoretically predicted oblate shape for this nucleus.

• OSTI ID: 5015522
• Journal Information: Physical Review (Section) C: Nuclear Physics; (USA), Journal Name: Physical Review (Section) C: Nuclear Physics; (USA) Vol. 40:5; ISSN 0556-2813; ISSN PRVCA
• Country of Publication: United States
• Language: English

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73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCELERATORS
ANGULAR DISTRIBUTION
ANGULAR MOMENTUM
BARYONS
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CALCIUM 40 TARGET
CHARGED-PARTICLE REACTIONS
COINCIDENCE SPECTROMETRY
COMPOUND-NUCLEUS REACTIONS
DEFORMATION
DISTRIBUTION
E1-TRANSITIONS
ELECTROMAGNETIC RADIATION
ELECTROSTATIC ACCELERATORS
ELEMENTARY PARTICLES
ENERGY LEVELS
ENERGY RANGE
ENERGY-LEVEL TRANSITIONS
EVEN-ODD NUCLEI
FERMIONS
GAMMA RADIATION
HADRONS
HALF-LIFE
HEAVY ION REACTIONS
INTERMEDIATE MASS NUCLEI
IONIZING RADIATIONS
ISOTOPES
MEV RANGE
MEV RANGE 10-100
MEV RANGE 100-1000
MINUTES LIVING RADIOISOTOPES
MULTIPOLE TRANSITIONS
NEUTRONS
NUCLEAR DEFORMATION
NUCLEAR REACTIONS
NUCLEI
NUCLEONS
PARITY
PARTICLE PROPERTIES
PROTONS
RADIATIONS
RADIOISOTOPES
SELENIUM 69
SELENIUM ISOTOPES
SPIN
SULFUR 32 REACTIONS
TARGETS
VAN DE GRAAFF ACCELERATORS