Evidence for Gamow-Teller Decay of Ni 78 Core from Beta-Delayed Neutron Emission Studies

Madurga, M.; Paulauskas, S. V.; Grzywacz, R.; Miller, D.; Bardayan, D. W.; Batchelder, J. C.; Brewer, N. T.; Cizewski, J. A.; Fijałkowska, A.; Gross, C. J.; Howard, M. E.; Ilyushkin, S. V.; Manning, B.; Matoš, M.; Mendez, A. J.; Miernik, K.; Padgett, S. W.; Peters, W. A.; Rasco, B. C.; Ratkiewicz, A.; Rykaczewski, K. P.; Stracener, D. W.; Wang, E. H.; Wolińska-Cichocka, M.; Zganjar, E. F.

doi:10.1103/PhysRevLett.117.092502

Title: Evidence for Gamow-Teller Decay of ${}^{78}{Ni}$ Core from Beta-Delayed Neutron Emission Studies

Journal Article · Tue Aug 23 00:00:00 EDT 2016 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.117.092502· OSTI ID:1328617

Madurga, M.; Paulauskas, S. V.; Grzywacz, R.; Miller, D.; Bardayan, D. W.; Batchelder, J. C.; Brewer, N. T.; Cizewski, J. A.; Fijałkowska, A.; Gross, C. J.; Howard, M. E.; Ilyushkin, S. V.; Manning, B.; Matoš, M.; Mendez, A. J.; Miernik, K.; Padgett, S. W.; Peters, W. A.; Rasco, B. C.; Ratkiewicz, A. more »

The β-delayed neutron emission of ^83,84Ga isotopes was studied using the neutron time-of-flight technique. The measured neutron energy spectra showed emission from states at excitation energies high above the neutron separation energy and previously not observed in the β decay of midmass nuclei. The large decay strength deduced from the observed intense neutron emission is a signature of Gamow-Teller transformation. This observation was interpreted as evidence for allowed β decay to ⁷⁸Ni core-excited states in ^83,84Ge favored by shell effects. We developed shell model calculations in the proton fpg_9/2 and neutron extended fpg_9/2 + d_5/2 valence space using realistic interactions that were used to understand measured β-decay lifetimes. We conclude that enhanced, concentrated β-decay strength for neutron-unbound states may be common for very neutron-rich nuclei. Furthermore, this leads to intense β-delayed high-energy neutron and strong multineutron emission probabilities that in turn affect astrophysical nucleosynthesis models.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP); USDOE National Nuclear Security Administration (NNSA)

Grant/Contract Number:: FG52-08NA28552; AC05-00OR22725; FG02-96ER40983; FG05-88ER40407

OSTI ID:: 1328617

Alternate ID(s):: OSTI ID: 1480628

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Vol. 117 Journal Issue: 9; ISSN 0031-9007

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 32 works

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Title: Evidence for Gamow-Teller Decay of ${}^{78}{Ni}$ Core from Beta-Delayed Neutron Emission Studies