Identifying the spin-trapped character of the <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Si</mi><mprescripts></mprescripts><none></none><mn>32</mn></mmultiscripts></math> isomeric state

J. Williams; G. Hackman; K. Starosta; R. S. Lubna; Priyanka Choudhary; P. C. Srivastava; C. Andreoiu; D. Annen; H. Asch; M. D. H. K. G. Badanage; G. C. Ball; M. Beuschlein; H. Bidaman; V. Bildstein; R. Coleman; A. B. Garnsworthy; B. Greaves; G. Leckenby; V. Karayonchev; M. S. Martin; C. Natzke; C. M. Petrache; A. Radich; E. Raleigh-Smith; D. Rhodes; R. Russell; M. Satrazani; P. Spagnoletti; C. E. Svensson; D. Tam; F. Wu (吴桐安; D. Yates; Z. Yu

doi:10.1103/PhysRevC.108.L051305

Letter

Identifying the spin-trapped character of the ${}^{32}{Si}$ isomeric state

J. Williams ^1,*, G. Hackman¹, K. Starosta², R. S. Lubna³, Priyanka Choudhary⁴, P. C. Srivastava⁴, C. Andreoiu², D. Annen², H. Asch⁵ et al.

M. D. H. K. G. Badanage², G. C. Ball¹, M. Beuschlein⁶, H. Bidaman⁷, V. Bildstein⁷, R. Coleman⁷, A. B. Garnsworthy¹, B. Greaves⁷, G. Leckenby^1,8, V. Karayonchev^1,†, M. S. Martin⁵, C. Natzke¹, C. M. Petrache⁹, A. Radich⁷, E. Raleigh-Smith¹, D. Rhodes¹, R. Russell¹⁰, M. Satrazani¹¹, P. Spagnoletti², C. E. Svensson⁷, D. Tam⁵, F. Wu (吴桐安)², D. Yates^1,8, and Z. Yu²

¹TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia V6T 2A3, Canada
²Department of Chemistry, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
³Facility for Rare Isotope Beams, Michigan State University, 640 South Shaw Lane, East Lansing, Michigan 48824, USA
⁴Department of Physics, Indian Institute of Technology Roorkee, Roorkee 247667, India
⁵Department of Physics, Simon Fraser University, 8888 University Drive, Burnaby, British Columbia V5A 1S6, Canada
⁶Technische Universität Darmstadt, Department of Physics, Institute for Nuclear Physics, Schlossgartenstr. 9, Darmstadt 64289, Germany
⁷University of Guelph, 50 Stone Rd E, Guelph, Ontario N1G 2W1, Canada
⁸Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
⁹Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay 91405, France
¹⁰University of Surrey, Guildford GU2 7XH, United Kingdom
¹¹University of Liverpool, Liverpool L69 3BX, United Kingdom

^*ewilliams@triumf.ca
^†Present address: Argonne National Laboratory, 9700 S. Cass Avenue, Lemont, Illinois 60439, USA.

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Phys. Rev. C 108, L051305 – Published 27 November, 2023

DOI: https://doi.org/10.1103/PhysRevC.108.L051305

Abstract

The properties of a nanosecond isomer in ${}^{32}{Si}$ , disputed in previous studies, depend on the evolution of proton and neutron shell gaps near the island of inversion. We have placed the isomer at 5505.2(2) keV with $J^{π} = 5^{-}$ , decaying primarily via an $E 3$ transition to the $2_{1}^{+}$ state. The $E 3$ strength of 0.0841(10) W.u. is unusually small and suggests that this isomer is dominated by the ${(ν d_{3 / 2})}^{- 1} \otimes {(ν f_{7 / 2})}^{1}$ configuration, which is sensitive to the $N = 20$ shell gap. A newly observed $4_{1}^{+}$ state is placed at 5881.4(13) keV; its energy is enhanced by the $Z = 14$ subshell closure. This indicates that the isomer is located in a yrast trap, a feature rarely seen at low mass numbers.

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Identifying the spin-trapped character of the ${}^{32}{Si}$ isomeric state

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Identifying the spin-trapped character of the Si32 isomeric state

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Identifying the spin-trapped character of the ${}^{32}{Si}$ isomeric state