β-delayed neutron spectroscopy of Co70,72 ground-state and isomeric-state decays

K. Siegl; A. M. Keeler; R. Grzywacz; N. T. Brewer; B. P. Crider; A. Fijalkowska; S. Go; M. Hall; J. H. Hamilton; S. V. Ilyushkin; T. King; S. Liddick; M. Madurga; P. D. O'Malley; S. V. Paulauskas; M. M. Rajabali; S. Z. Taylor; E. H. Wang; Z. Y. Xu; C. Zachary

doi:10.1103/PhysRevC.109.064309

β-delayed neutron spectroscopy of Co70,72 ground-state and isomeric-state decays

K. Siegl
, A. M. Keeler
, R. Grzywacz
, N. T. Brewer
, B. P. Crider
, A. Fijalkowska
, S. Go
, M. Hall
, J. H. Hamilton
, S. V. Ilyushkin
, T. King
, S. Liddick
, M. Madurga
, P. D. O'Malley
, S. V. Paulauskas
, M. M. Rajabali
, S. Z. Taylor
, E. H. Wang
, Z. Y. Xu
, C. Zachary

Research output: Contribution to journal › Article › peer-review

1 Scopus citations

Abstract

The β-decaying states of Co70,72 were studied at the National Superconducting Cyclotron Laboratory using the VANDLE neutron time-of-flight array. The (6-,7-)β-decaying state in Co70 is near-spherical with a lifetime of 113±7 ms, and the low-spin (1+,2+)β-decaying state is postulated to be the prolate deformed ground state with a lifetime of 508±7 ms. Both decay predominantly to the bound states of Ni70. For the first time neutron-emissions from neutron unbound states from both the (6-,7-) and (1+,2+)β decays were measured. Even with the low statistics data, we were able to disentangle the neutron emission from both decays, which enabled a determination of β-decay strength above the neutron separation energy of Ni70. Neutron emission probabilities were measured to be 7.1±1.5% and 9.4±1.7%, respectively, for the (6-,7-) and (1+,2+) decays. The decay pattern of the Co70 is driven by neutron f5/2 to proton f7/2 Gamow-Teller transformation. The observed population of neutron unbound states is attributed to the conversion of p1/2 and p3/2 neutrons to p3/2 and p1/2 protons excited across the Z=28 closed shell.

Original language	English
Article number	064309
Journal	Physical Review C
Volume	109
Issue number	6
DOIs	https://doi.org/10.1103/PhysRevC.109.064309
State	Published - Jun 2024
Externally published	Yes

Funding

This research was sponsored in part by the Office of Nuclear Physics, U.S. Department of Energy under Awards No. DE-FG02-96ER40983 (UTK) and No. DE-AC05-00OR22725 (ORNL), and by the National Nuclear Security Administration under the Stewardship Science Academic Alliances program through DOE Awards No. DE-NA0003899 and No. DE-NA0004068, U.S. Department of Energy, National Nuclear Security Administration, Grant No. DE-NA0004068, and National Science Foundation under Grant No. PHY 1848177 (CAREER) This research was sponsored in part by the Office of Nuclear Physics, U.S. Department of Energy under Awards No. DE-FG02-96ER40983 (UTK) and No. DE-AC05-00OR22725 (ORNL), and by the National Nuclear Security Administration under the Stewardship Science Academic Alliances program through DOE Awards No. DE-NA0003899 and No. DE-NA0004068, U.S. Department of Energy, National Nuclear Security Administration, Grant No. DE-NA0004068, and National Science Foundation under Grant No. PHY 1848177 (CAREER).

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10.1103/PhysRevC.109.064309

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Siegl, K., Keeler, A. M., Grzywacz, R., Brewer, N. T., Crider, B. P., Fijalkowska, A., Go, S., Hall, M., Hamilton, J. H., Ilyushkin, S. V., King, T., Liddick, S., Madurga, M., O'Malley, P. D., Paulauskas, S. V., Rajabali, M. M., Taylor, S. Z., Wang, E. H., Xu, Z. Y., & Zachary, C. (2024). β-delayed neutron spectroscopy of Co70,72 ground-state and isomeric-state decays. Physical Review C, 109(6), Article 064309. https://doi.org/10.1103/PhysRevC.109.064309

@article{65e2828f17b14d9a8eb23e02f3b85cd7,

title = "β-delayed neutron spectroscopy of Co70,72 ground-state and isomeric-state decays",

abstract = "The β-decaying states of Co70,72 were studied at the National Superconducting Cyclotron Laboratory using the VANDLE neutron time-of-flight array. The (6-,7-)β-decaying state in Co70 is near-spherical with a lifetime of 113±7 ms, and the low-spin (1+,2+)β-decaying state is postulated to be the prolate deformed ground state with a lifetime of 508±7 ms. Both decay predominantly to the bound states of Ni70. For the first time neutron-emissions from neutron unbound states from both the (6-,7-) and (1+,2+)β decays were measured. Even with the low statistics data, we were able to disentangle the neutron emission from both decays, which enabled a determination of β-decay strength above the neutron separation energy of Ni70. Neutron emission probabilities were measured to be 7.1±1.5\% and 9.4±1.7\%, respectively, for the (6-,7-) and (1+,2+) decays. The decay pattern of the Co70 is driven by neutron f5/2 to proton f7/2 Gamow-Teller transformation. The observed population of neutron unbound states is attributed to the conversion of p1/2 and p3/2 neutrons to p3/2 and p1/2 protons excited across the Z=28 closed shell.",

author = "K. Siegl and Keeler, \{A. M.\} and R. Grzywacz and Brewer, \{N. T.\} and Crider, \{B. P.\} and A. Fijalkowska and S. Go and M. Hall and Hamilton, \{J. H.\} and Ilyushkin, \{S. V.\} and T. King and S. Liddick and M. Madurga and O'Malley, \{P. D.\} and Paulauskas, \{S. V.\} and Rajabali, \{M. M.\} and Taylor, \{S. Z.\} and Wang, \{E. H.\} and Xu, \{Z. Y.\} and C. Zachary",

note = "Publisher Copyright: {\textcopyright} 2024 American Physical Society.",

year = "2024",

month = jun,

doi = "10.1103/PhysRevC.109.064309",

language = "English",

volume = "109",

journal = "Physical Review C",

issn = "2469-9985",

publisher = "American Physical Society",

number = "6",

}

Siegl, K, Keeler, AM, Grzywacz, R, Brewer, NT, Crider, BP, Fijalkowska, A, Go, S, Hall, M, Hamilton, JH, Ilyushkin, SV, King, T, Liddick, S, Madurga, M, O'Malley, PD, Paulauskas, SV, Rajabali, MM, Taylor, SZ, Wang, EH, Xu, ZY & Zachary, C 2024, 'β-delayed neutron spectroscopy of Co70,72 ground-state and isomeric-state decays', Physical Review C, vol. 109, no. 6, 064309. https://doi.org/10.1103/PhysRevC.109.064309

TY - JOUR

T1 - β-delayed neutron spectroscopy of Co70,72 ground-state and isomeric-state decays

AU - Siegl, K.

AU - Keeler, A. M.

AU - Grzywacz, R.

AU - Brewer, N. T.

AU - Crider, B. P.

AU - Fijalkowska, A.

AU - Go, S.

AU - Hall, M.

AU - Hamilton, J. H.

AU - Ilyushkin, S. V.

AU - King, T.

AU - Liddick, S.

AU - Madurga, M.

AU - O'Malley, P. D.

AU - Paulauskas, S. V.

AU - Rajabali, M. M.

AU - Taylor, S. Z.

AU - Wang, E. H.

AU - Xu, Z. Y.

AU - Zachary, C.

PY - 2024/6

Y1 - 2024/6

N2 - The β-decaying states of Co70,72 were studied at the National Superconducting Cyclotron Laboratory using the VANDLE neutron time-of-flight array. The (6-,7-)β-decaying state in Co70 is near-spherical with a lifetime of 113±7 ms, and the low-spin (1+,2+)β-decaying state is postulated to be the prolate deformed ground state with a lifetime of 508±7 ms. Both decay predominantly to the bound states of Ni70. For the first time neutron-emissions from neutron unbound states from both the (6-,7-) and (1+,2+)β decays were measured. Even with the low statistics data, we were able to disentangle the neutron emission from both decays, which enabled a determination of β-decay strength above the neutron separation energy of Ni70. Neutron emission probabilities were measured to be 7.1±1.5% and 9.4±1.7%, respectively, for the (6-,7-) and (1+,2+) decays. The decay pattern of the Co70 is driven by neutron f5/2 to proton f7/2 Gamow-Teller transformation. The observed population of neutron unbound states is attributed to the conversion of p1/2 and p3/2 neutrons to p3/2 and p1/2 protons excited across the Z=28 closed shell.

AB - The β-decaying states of Co70,72 were studied at the National Superconducting Cyclotron Laboratory using the VANDLE neutron time-of-flight array. The (6-,7-)β-decaying state in Co70 is near-spherical with a lifetime of 113±7 ms, and the low-spin (1+,2+)β-decaying state is postulated to be the prolate deformed ground state with a lifetime of 508±7 ms. Both decay predominantly to the bound states of Ni70. For the first time neutron-emissions from neutron unbound states from both the (6-,7-) and (1+,2+)β decays were measured. Even with the low statistics data, we were able to disentangle the neutron emission from both decays, which enabled a determination of β-decay strength above the neutron separation energy of Ni70. Neutron emission probabilities were measured to be 7.1±1.5% and 9.4±1.7%, respectively, for the (6-,7-) and (1+,2+) decays. The decay pattern of the Co70 is driven by neutron f5/2 to proton f7/2 Gamow-Teller transformation. The observed population of neutron unbound states is attributed to the conversion of p1/2 and p3/2 neutrons to p3/2 and p1/2 protons excited across the Z=28 closed shell.

UR - https://www.scopus.com/pages/publications/85195876513

U2 - 10.1103/PhysRevC.109.064309

DO - 10.1103/PhysRevC.109.064309

M3 - Article

AN - SCOPUS:85195876513

SN - 2469-9985

VL - 109

JO - Physical Review C

JF - Physical Review C

IS - 6

M1 - 064309

ER -

β-delayed neutron spectroscopy of Co70,72 ground-state and isomeric-state decays

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