Non-yrast states and shape co-existence in 172Os

P. M. Davidson; G. D. Dracoulis; T. Kibédi; A. P. Byrne; S. S. Anderssen; A. M. Baxter; B. Fabricius; G. J. Lane; A. E. Stuchbery

doi:10.1016/0375-9474(94)90005-1

Non-yrast states and shape co-existence in ¹⁷²Os

P. M. Davidson^*, G. D. Dracoulis, T. Kibédi, A. P. Byrne, S. S. Anderssen, A. M. Baxter, B. Fabricius, G. J. Lane, A. E. Stuchbery

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

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Abstract

Previous studies of ¹⁷²Os noted an anomaly in the behaviour of the moment of inertia of the yrast band at low spin. A phenomenological model of shape coexistence based on interacting rotational bands was proposed to explain this anomaly and this model predicted low-lying non-yrast states. In order to test these predictions, the β-decay of ¹⁷²Ir has been used to populate ¹⁷²Os. Excited states have been observed and classified into positive-parity "quasi-β" and "quasi-γ" bands and a negative-parity band. The energies of the quasi-β band states are seen to be in general agreement with the predictions of the phenomenological model and the model is refined to take into account the new data. The bands involved are determined to have significantly different moments of inertia.

Original language	English
Pages (from-to)	90-106
Number of pages	17
Journal	Nuclear Physics, Section A
Volume	568
Issue number	1
DOIs	https://doi.org/10.1016/0375-9474(94)90005-1
Publication status	Published - 7 Feb 1994

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title = "Non-yrast states and shape co-existence in 172Os",

abstract = "Previous studies of 172Os noted an anomaly in the behaviour of the moment of inertia of the yrast band at low spin. A phenomenological model of shape coexistence based on interacting rotational bands was proposed to explain this anomaly and this model predicted low-lying non-yrast states. In order to test these predictions, the β-decay of 172Ir has been used to populate 172Os. Excited states have been observed and classified into positive-parity {"}quasi-β{"} and {"}quasi-γ{"} bands and a negative-parity band. The energies of the quasi-β band states are seen to be in general agreement with the predictions of the phenomenological model and the model is refined to take into account the new data. The bands involved are determined to have significantly different moments of inertia.",

keywords = "Nuclear structure",

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T1 - Non-yrast states and shape co-existence in 172Os

AU - Davidson, P. M.

AU - Dracoulis, G. D.

AU - Kibédi, T.

AU - Byrne, A. P.

AU - Anderssen, S. S.

AU - Baxter, A. M.

AU - Fabricius, B.

AU - Lane, G. J.

AU - Stuchbery, A. E.

PY - 1994/2/7

Y1 - 1994/2/7

N2 - Previous studies of 172Os noted an anomaly in the behaviour of the moment of inertia of the yrast band at low spin. A phenomenological model of shape coexistence based on interacting rotational bands was proposed to explain this anomaly and this model predicted low-lying non-yrast states. In order to test these predictions, the β-decay of 172Ir has been used to populate 172Os. Excited states have been observed and classified into positive-parity "quasi-β" and "quasi-γ" bands and a negative-parity band. The energies of the quasi-β band states are seen to be in general agreement with the predictions of the phenomenological model and the model is refined to take into account the new data. The bands involved are determined to have significantly different moments of inertia.

AB - Previous studies of 172Os noted an anomaly in the behaviour of the moment of inertia of the yrast band at low spin. A phenomenological model of shape coexistence based on interacting rotational bands was proposed to explain this anomaly and this model predicted low-lying non-yrast states. In order to test these predictions, the β-decay of 172Ir has been used to populate 172Os. Excited states have been observed and classified into positive-parity "quasi-β" and "quasi-γ" bands and a negative-parity band. The energies of the quasi-β band states are seen to be in general agreement with the predictions of the phenomenological model and the model is refined to take into account the new data. The bands involved are determined to have significantly different moments of inertia.

KW - Nuclear structure

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ER -

Non-yrast states and shape co-existence in ¹⁷²Os

Abstract

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