Shape coexistence in 72 Se investigated following the β decay of 72 Br
Date
2011
Authors
McCutchan, E A
Lister, C J
Ahn, T.
Casperson, R.J.
Heinz, A.
Ilie, G.
Qian, J.
Williams, Elizabeth
Winkler, R.
Werner, V.
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Volume Title
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American Physical Society
Abstract
The structure of Se72 was investigated following the ?/? + decay of Br72 produced in the Ni58(O16, pn) reaction at 50 MeV. Using a beam chopping system, off-beam ?-ray decay data was collected with an array of clover Ge detectors. ?-? coincidence measurements provided a significant modification of the prior level scheme, and ?-? angular correlation measurements allowed spin determinations and multipole mixing ratio extraction. The new information on the non-yrast states was combined with previous in-beam data to investigate the issue of shape coexistence by comparing to various configuration mixing approaches. Clear evidence for shape coexistence is found, with a ground state of modest, or slightly oblate, deformation and a well-deformed prolate shape that would lie at an unperturbed excitation of 875 keV. The shape mixing is near complete at low spin. � 2011 American Physical Society.
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Source
Physical Review C: Nuclear Physics
Type
Journal article
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Open Access