Strong neutron-γ competition above the neutron threshold in the decay of Co70

Spyrou, A.; Liddick, S. N.; Naqvi, F.; Crider, B. P.; Dombos, A. C.; Bleuel, D. L.; Brown, B. A.; Couture, Aaron Joseph; Campo, L. Crespo; Guttormsen, M.; Larsen, A. C.; Lewis, R.; Moller, Peter; Mosby, Shea Morgan; Mumpower, Matthew Ryan; Perdikakis, G.; Prokop, C. J.; Renstrom, T.; Siem, S.; Quinn, S. J.; Valenta, S.

doi:10.1103/PhysRevLett.117.142701

Title: Strong neutron- $γ$ competition above the neutron threshold in the decay of ${}^{70}{Co}$

Journal Article · Thu Sep 29 00:00:00 EDT 2016 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.117.142701· OSTI ID:1346844

Spyrou, A. ^[1]; Liddick, S. N. ^[1]; Naqvi, F. ^[1]; Crider, B. P. ^[1]; Dombos, A. C. ^[1]; Bleuel, D. L. ^[2]; Brown, B. A. ^[1];

^[3]; Campo, L. Crespo ^[4]; Guttormsen, M. ^[4]; Larsen, A. C. ^[4]; Lewis, R. ^[1];

^[3];

^[3]; Perdikakis, G. ^[5]; Prokop, C. J. ^[1]; Renstrom, T. ^[4]; Siem, S. ^[4]; Quinn, S. J. ^[1] more »

Michigan State Univ., East Lansing, MI (United States)
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Univ. of Oslo, Oslo (Norway)
Central Michigan Univ., Mount Pleasant, MI (United States); Michigan State Univ., East Lansing, MI (United States)
Charles Univ. in Prague (Czech Republic)

The β -decay intensity of 70 Co was measured for the first time using the technique of total absorption spectroscopy. The large β -decay Q value [12.3(3) MeV] offers a rare opportunity to study β -decay properties in a broad energy range. Two surprising features were observed in the experimental results, namely, the large fragmentation of the β intensity at high energies, as well as the strong competition between γ rays and neutrons, up to more than 2 MeV above the neutron-separation energy. The data are compared to two theoretical calculations: the shell model and the quasiparticle random phase approximation (QRPA). Both models seem to be missing a significant strength at high excitation energies. Possible interpretations of this discrepancy are discussed. The shell model is used for a detailed nuclear structure interpretation and helps to explain the observed γ -neutron competition. The comparison to the QRPA calculations is done as a means to test a model that provides global β -decay properties for astrophysical calculations. Our work demonstrates the importance of performing detailed comparisons to experimental results, beyond the simple half-life comparisons. A realistic and robust description of the β -decay intensity is crucial for our understanding of nuclear structure as well as of r -process nucleosynthesis.

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Research Organization:: Los Alamos National Lab. (LANL), Los Alamos, NM (United States); Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: AC52-06NA25396; AC52-07NA27344

OSTI ID:: 1346844

Alternate ID(s):: OSTI ID: 1378498

Report Number(s):: LA-UR-16-26924; LLNL-JRNL-737170; PRLTAO; TRN: US1701599

Journal Information:: Physical Review Letters, Vol. 117, Issue 14; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 34 works

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Title: Strong neutron- $γ$ competition above the neutron threshold in the decay of ${}^{70}{Co}$