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Evidence for near instability against gamma deformation in Ba 128

Evidence for near instability against gamma deformation in Ba 128 The decay of 5.2-min La 128 to levels in Ba 128 has been investigated by γ -ray and conversion-electron spectroscopy. Of 78 γ rays assigned to the decay, 69 have been placed in a decay scheme consisting of 31 excited states. The La 128 ground state is probably 5 - and is interpreted as the ( ν 7 2 - 523 + π 3 2 + 411 ) configuration. EC + β + decays with log ft values in the allowed range to states at 2425.5 and 2878.3 keV are explained by ( ν 7 2 - 523 + ν 1 2 + 411 ) 4 - and ( ν 7 2 - 523 + ν 3 2 + 402 ) 5 - configurations, respectively. A quasi- γ band is proposed with levels at 884.5 keV ( 2 + ), 1324.5 keV ( 3 + ), 1372.4 keV ( 4 + ), and 1931.4 keV ( 5 + ). A state at 1939.4 keV is possibly the 6 + band member. The properties of Ba 128 were calculated using the microscopic boson-expansion code of Kishimoto and Tamura and found to be in rather good agreement with experiment. The small experimentally observed splitting (48 keV) between the 3 γ and 4 γ states is a signature of γ instability. The prolate-oblate difference, consistent with the experimental data, is estimated to be 0.5 MeV, a value in good agreement with potential-surface calculations. RADIOACTIVITY La 128 from Sn 118 ( N 14 , 4 n ) , measured T 1 2 , E γ , I γ , I ce , γ - γ coin; deduced log ft . Ba 128 deduced levels, ICC, J , π . Enriched target, Ge(Li) and Si(Li) detectors. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review C American Physical Society (APS)

Evidence for near instability against gamma deformation in Ba 128

Zolnowski, D. R; Sugihara, T. T
Physical Review C , Volume 16 (1) – Jul 1, 1977
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Publisher
American Physical Society (APS)
Copyright
Copyright © 1977 The American Physical Society
ISSN
1089-490X
DOI
10.1103/PhysRevC.16.408
Publisher site
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Abstract

The decay of 5.2-min La 128 to levels in Ba 128 has been investigated by γ -ray and conversion-electron spectroscopy. Of 78 γ rays assigned to the decay, 69 have been placed in a decay scheme consisting of 31 excited states. The La 128 ground state is probably 5 - and is interpreted as the ( ν 7 2 - 523 + π 3 2 + 411 ) configuration. EC + β + decays with log ft values in the allowed range to states at 2425.5 and 2878.3 keV are explained by ( ν 7 2 - 523 + ν 1 2 + 411 ) 4 - and ( ν 7 2 - 523 + ν 3 2 + 402 ) 5 - configurations, respectively. A quasi- γ band is proposed with levels at 884.5 keV ( 2 + ), 1324.5 keV ( 3 + ), 1372.4 keV ( 4 + ), and 1931.4 keV ( 5 + ). A state at 1939.4 keV is possibly the 6 + band member. The properties of Ba 128 were calculated using the microscopic boson-expansion code of Kishimoto and Tamura and found to be in rather good agreement with experiment. The small experimentally observed splitting (48 keV) between the 3 γ and 4 γ states is a signature of γ instability. The prolate-oblate difference, consistent with the experimental data, is estimated to be 0.5 MeV, a value in good agreement with potential-surface calculations. RADIOACTIVITY La 128 from Sn 118 ( N 14 , 4 n ) , measured T 1 2 , E γ , I γ , I ce , γ - γ coin; deduced log ft . Ba 128 deduced levels, ICC, J , π . Enriched target, Ge(Li) and Si(Li) detectors.

Journal

Physical Review C – American Physical Society (APS)

Published: Jul 1, 1977

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