Spin inhibition in γ -decay probabilities for states above Sn in Sm and Dy nuclei

Reingold, C. S.; Simon, A.; Hughes, R. O.; Harke, J. T.; Chipps, K. A.; Burcher, S.; Blankstien, D. T.; Cizewski, J. A.; Cooper, N.; Hall, M.; Ota, S.; Schroeder, B.; Upadhyayula, S.

doi:10.1103/physrevc.105.034612

Title: Spin inhibition in γ -decay probabilities for states above S n in Sm and Dy nuclei

Journal Article · 28 February 2022 · Physical Review. C

DOI: https://doi.org/10.1103/physrevc.105.034612 · OSTI ID:1871155

Reingold, C. S. ^[1];

; Hughes, R. O.;

;

; Burcher, S.; Blankstien, D. T.;

; Cooper, N.; Hall, M.;

; Schroeder, B.;

Rutgers University

When a compound nucleus is formed at an excitation energy above the neutron-separation threshold, it is assumed that its de-excitation will proceed via neutron emission. However, if the excited nucleus is in a high-spin state, but does not have enough excitation energy to conserve angular momentum by either photon emission after neutron emission or relative angular momentum carried off by the neutron, the nucleus will de-excite via γ -emission instead. This effect, the spin inhibition, provides an insight into the structure of the compound nuclei and can aid the understanding of the distribution of the populated spin states in a compound nuclear reaction. In this work, the effects of spin inhibition on the γ-decay probabilities from states in 146,147Sm and 160Dy are presented. For high-spin states above the Sn, spin inhibition is able to suppress neutron emission, and de-excitation via γ -ray emission is observed for states up to 3 MeV above the Sn .

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Research Organization:: Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Rutgers Univ., New Brunswick, NJ (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC05-00OR22725; AC52-07NA27344; FG02-95ER40934; NA0000979; NA0003780; NA0003841; NA0003897

OSTI ID:: 1871155

Report Number(s):: LLNL-JRNL-839383; PHY-1404218; PHY-1713857

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 3 Vol. 105; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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