In-beam. gamma. -ray spectroscopy of the N = Z +1 nucleus sup 63 Ga

Journal Article · Wed May 01 00:00:00 EDT 1991 · Physical Review, C (Nuclear Physics); (USA)

DOI:https://doi.org/10.1103/PhysRevC.43.2082· OSTI ID:5677221

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

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1. Department of Physics, University of Pennsylvania, Philadelpha, Pennsylvania 19104 (US)

A total of ten previously observed {gamma} rays have been assigned to the {ital N}={ital Z}+1 nucleus {sup 63}Ga; these provide the first information on excited states reported in this neutron-deficient system. {sup 63}Ga has been populated using the {sup 40}Ca({sup 28}Si, {alpha}{ital p}), {sup 40}Ca({sup 32}S, 2{alpha}{ital p}), and {sup 40}Ca({sup 29}Si, {alpha}{ital pn}) reactions at beam energies of 80--100 MeV. Particle-{gamma} coincidence techniques provide a definitive identification of {gamma} transitions in {sup 63}Ga. An yrast-level scheme is proposed on the basis of charged-particle-{gamma}, charged-particle-{gamma}-{gamma}, and neutron-{gamma}-{gamma} coincidences. Spin and parity assignments are based on neutron-gated {gamma}-ray angular distributions, directional correlation with oriented nuclei ratios and systematics. Nine new energy levels are identified in addition to the previously known ground state, with the highest level at an excitation energy of 7.7 MeV. The results are interpreted in terms of the relevant single-particle orbitals and the systematics of the neighboring nuclei. In addition, a new determination has been made of the {ital E}2/{ital M}1 mixing ratio for the (5/2{sup {minus}}){sub 1}{r arrow}(3/2{sup {minus}}){sub 1} transition in {sup 65}Ga, resolving a disagreement between two previous measurements.

• OSTI ID: 5677221
• Journal Information: Physical Review, C (Nuclear Physics); (USA), Vol. 43:5; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
GALLIUM 63
ENERGY LEVELS
ANGULAR CORRELATION
ANGULAR DISTRIBUTION
CALCIUM 40 TARGET
COINCIDENCE SPECTROMETRY
GAMMA SPECTROSCOPY
PARITY
SHELL MODELS
SILICON 28 REACTIONS
SILICON 29 REACTIONS
SPIN
SULFUR 32 REACTIONS
ANGULAR MOMENTUM
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
CHARGED-PARTICLE REACTIONS
CORRELATIONS
DISTRIBUTION
GALLIUM ISOTOPES
HEAVY ION REACTIONS
INTERMEDIATE MASS NUCLEI
ISOTOPES
MATHEMATICAL MODELS
NUCLEAR MODELS
NUCLEAR REACTIONS
NUCLEI
ODD-EVEN NUCLEI
PARTICLE PROPERTIES
RADIOISOTOPES
SPECTROSCOPY
TARGETS
651620* - Nuclear Properties & Reactions
A=59-89
Experimental