Study of the β-decay of116m1In: A new interpretation of low-lying 0+states in116Sn

J. L. Pore, D. S. Cross, C. Andreoiu, R. Ashley, G. C. Ball, P. C. Bender, A. S. Chester, A. Diaz Varela, G. A. Demand, R. Dunlop, A. B. Garnsworthy, P. E. Garrett, G. Hackman, B. Hadinia, B. Jigmeddorj, A. T. Laffoley, A. Liblong, R. Kanungo, B. Noakes, C. M. PetracheM. M. Rajabali, K. Starosta, C. E. Svensson, P. J. Voss, Z. M. Wang, J. L. Wood, S. W. Yates

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8 Scopus citations

Abstract

The 116Sn nucleus contains a collective rotational band originating from proton π 2p-2h excitations across the proton Z= 50 shell gap. Even though this nucleus has been extensively investigated in the past, there was still missing information on the low-energy interband transitions connecting the intruder and normal structures. The low-lying structure of116Sn was investigated through a high-statistics study of the β-decay of116m1In with the 8 π spectrometer and its ancillary detectors at TRIUMF. These measurements are critical in order to properly characterize the π 2p-2h rotational band. Weak γ-decay branches are observed utilizing γ-γ coincidence spectroscopy methods, leading to the first direct observation of the 85 keV 22+→03+γ ray with a transition strength of B(E2) = 99. 7 (84) W.u. The analysis of these results strongly suggests that the 2027 keV 03+ state should replace the previously assigned 1757 keV 02+ state as the band-head of the π 2p-2h rotational band.

Original languageEnglish
Article number27
JournalEuropean Physical Journal A
Volume53
Issue number2
DOIs
StatePublished - Feb 1 2017

Bibliographical note

Publisher Copyright:
© 2017, SIF, Springer-Verlag Berlin Heidelberg. All Right Reserved.

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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