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

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

doi:10.1103/PhysRevLett.117.092502

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

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

Medical Isotopes and Development

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Abstract

The β-delayed neutron emission of Ga83,84 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 Ni78 core-excited states in Ge83,84 favored by shell effects. We developed shell model calculations in the proton fpg9/2 and neutron extended fpg9/2+d5/2 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. This leads to intense β-delayed high-energy neutron and strong multineutron emission probabilities that in turn affect astrophysical nucleosynthesis models.

Original language	English
Article number	092502
Journal	Physical Review Letters
Volume	117
Issue number	9
DOIs	https://doi.org/10.1103/PhysRevLett.117.092502
State	Published - Aug 23 2016

Funding

We thank the HRIBF operations staff for providing the excellent quality radioactive ion beams necessary for this work. This material is based upon work supported by the U.S. Department of Energy (DOE), Office of Science, Office of Nuclear Physics and this research used resources of the Holifield Radioactive Ion Beam Facility of Oak Ridge National Laboratory, which was a DOE Office of Science User Facility. This research was sponsored in part by the National Nuclear Security Administration under the Stewardship Science Academic Alliances program through DOE Award No.DE-FG52-08NA28552. This research was also sponsored by the Office of Nuclear Physics, U.S. Department of Energy under Awards No.DE-AC05-00OR22725 (ORNL), No.DE-FG02-96ER40983 (UTK), and No.DE-FG-05-88ER40407 (VU) and the National Science Foundation.

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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., ... Zganjar, E. F. (2016). Evidence for Gamow-Teller Decay of Ni 78 Core from Beta-Delayed Neutron Emission Studies. Physical Review Letters, 117(9), Article 092502. https://doi.org/10.1103/PhysRevLett.117.092502

@article{641561439cf04cdd968e10f0342ed6c2,

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

abstract = "The β-delayed neutron emission of Ga83,84 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 Ni78 core-excited states in Ge83,84 favored by shell effects. We developed shell model calculations in the proton fpg9/2 and neutron extended fpg9/2+d5/2 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. This leads to intense β-delayed high-energy neutron and strong multineutron emission probabilities that in turn affect astrophysical nucleosynthesis models.",

author = "M. Madurga and Paulauskas, \{S. V.\} and R. Grzywacz and D. Miller and Bardayan, \{D. W.\} and Batchelder, \{J. C.\} and Brewer, \{N. T.\} and Cizewski, \{J. A.\} and A. Fija{\l}kowska and Gross, \{C. J.\} and Howard, \{M. E.\} and Ilyushkin, \{S. V.\} and B. Manning and M. Mato{\v s} and Mendez, \{A. J.\} and K. Miernik and Padgett, \{S. W.\} and Peters, \{W. A.\} and Rasco, \{B. C.\} and A. Ratkiewicz and Rykaczewski, \{K. P.\} and Stracener, \{D. W.\} and Wang, \{E. H.\} and M. Woli{\'n}ska-Cichocka and Zganjar, \{E. F.\}",

note = "Publisher Copyright: {\textcopyright} 2016 authors. Published by the American Physical Society.",

year = "2016",

month = aug,

day = "23",

doi = "10.1103/PhysRevLett.117.092502",

language = "English",

volume = "117",

journal = "Physical Review Letters",

issn = "0031-9007",

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Madurga, M, Paulauskas, SV, Grzywacz, R, Miller, D, Bardayan, DW, Batchelder, JC, Brewer, NT, Cizewski, JA, Fijałkowska, A, Gross, CJ, Howard, ME, Ilyushkin, SV, Manning, B, Matoš, M, Mendez, AJ, Miernik, K, Padgett, SW, Peters, WA, Rasco, BC, Ratkiewicz, A, Rykaczewski, KP, Stracener, DW, Wang, EH, Wolińska-Cichocka, M & Zganjar, EF 2016, 'Evidence for Gamow-Teller Decay of Ni 78 Core from Beta-Delayed Neutron Emission Studies', Physical Review Letters, vol. 117, no. 9, 092502. https://doi.org/10.1103/PhysRevLett.117.092502

TY - JOUR

T1 - Evidence for Gamow-Teller Decay of Ni 78 Core from Beta-Delayed Neutron Emission Studies

AU - Madurga, M.

AU - Paulauskas, S. V.

AU - Grzywacz, R.

AU - Miller, D.

AU - Bardayan, D. W.

AU - Batchelder, J. C.

AU - Brewer, N. T.

AU - Cizewski, J. A.

AU - Fijałkowska, A.

AU - Gross, C. J.

AU - Howard, M. E.

AU - Ilyushkin, S. V.

AU - Manning, B.

AU - Matoš, M.

AU - Mendez, A. J.

AU - Miernik, K.

AU - Padgett, S. W.

AU - Peters, W. A.

AU - Rasco, B. C.

AU - Ratkiewicz, A.

AU - Rykaczewski, K. P.

AU - Stracener, D. W.

AU - Wang, E. H.

AU - Wolińska-Cichocka, M.

AU - Zganjar, E. F.

PY - 2016/8/23

Y1 - 2016/8/23

N2 - The β-delayed neutron emission of Ga83,84 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 Ni78 core-excited states in Ge83,84 favored by shell effects. We developed shell model calculations in the proton fpg9/2 and neutron extended fpg9/2+d5/2 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. This leads to intense β-delayed high-energy neutron and strong multineutron emission probabilities that in turn affect astrophysical nucleosynthesis models.

AB - The β-delayed neutron emission of Ga83,84 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 Ni78 core-excited states in Ge83,84 favored by shell effects. We developed shell model calculations in the proton fpg9/2 and neutron extended fpg9/2+d5/2 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. This leads to intense β-delayed high-energy neutron and strong multineutron emission probabilities that in turn affect astrophysical nucleosynthesis models.

UR - http://www.scopus.com/inward/record.url?scp=84987679427&partnerID=8YFLogxK

U2 - 10.1103/PhysRevLett.117.092502

DO - 10.1103/PhysRevLett.117.092502

M3 - Article

AN - SCOPUS:84987679427

SN - 0031-9007

VL - 117

JO - Physical Review Letters

JF - Physical Review Letters

IS - 9

M1 - 092502

ER -

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

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