Decay spectroscopy of 160Eu: Quasiparticle configurations of excited states and structure of Kπ = 4+ bandheads in 160Gd

Yates, Daniel; Krücken, Reiner; Dillmann, Iris; Garrett, P. E.; Olaizola, Bruno; Vedia, V.; Ali, F. A.; Andreoiu, Corina; Ashfield, W.; Ball, G. C.; Beadle, Z.; Bernier, Nikita; Bhattacharjee, S. S.; Bidaman, H.; Bildstein, Vinzenz; Bishop, D.; Bowry, M.; Burbadge, C.; Caballero-Folch, Roger; Chaney, D. Z.; Cross, D. C.; Diaz Varela, A.; Dunlop, M. R.; Dunlop, R.; Evitts, L. J.; Garcia, Fatima H.; Garnsworthy, A. B.; Georges, S.; Gillespie, S. A.; Hackman, G.; Henderson, J.; Jigmeddorj, B.; Lassen, J.; Li, Ruohong; Luna, B. K.; MacLean, A. D.; Natzke, Connor R.; Petrache, C. M.; Radich, A. J.; Rajabali, M. M.; Regan, Patrick H.; Saito, Y.; Smallcombe, J.; Smith, J. K.; Spieker, Mark-Christoph; Svensson, C. E.; Teigelhöfer, A.; Whitmore, K.; Zidar, T.

doi:10.1103/physrevc.107.064309

Title: Decay spectroscopy of ¹⁶⁰Eu: Quasiparticle configurations of excited states and structure of K^π = 4⁺ bandheads in ¹⁶⁰Gd

Journal Article · 14 June 2023 · Physical Review. C

DOI: https://doi.org/10.1103/physrevc.107.064309 · OSTI ID:2234114

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^[3]; Garrett, P. E. ^[4];

^[5]; Vedia, V. ^[6]; Ali, F. A. ^[7];

^[8]; Ashfield, W. ^[9]; Ball, G. C. ^[6]; Beadle, Z. ^[10];

^[11]; Bhattacharjee, S. S. ^[6]; Bidaman, H. ^[4];

^[4]; Bishop, D. ^[6]; Bowry, M. ^[12]; Burbadge, C. ^[4];

^[6]; Chaney, D. Z. ^[13] more »

TRIUMF, Vancouver, BC (Canada); Univ. of British Columbia, Vancouver, BC (Canada)
TRIUMF, Vancouver, BC (Canada); Univ. of British Columbia, Vancouver, BC (Canada); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
TRIUMF, Vancouver, BC (Canada); Univ. of Victoria, BC (Canada)
Univ. of Guelph, ON (Canada)
TRIUMF, Vancouver, BC (Canada); Consejo Superior de Investigaciones Cientificas (CSIC), Madrid (Spain). Inst. de Estructura de la Materia
TRIUMF, Vancouver, BC (Canada)
Univ. of Guelph, ON (Canada); University of Sulaimani, Kurdistan Region (Iraq)
TRIUMF, Vancouver, BC (Canada); Simon Fraser Univ., Burnaby, BC (Canada)
Reed College, Portland, OR (United States); Montana State Univ., Bozeman, MT (United States)
Reed College, Portland, OR (United States)
TRIUMF, Vancouver, BC (Canada); Univ. of British Columbia, Vancouver, BC (Canada); Univ. of the Western Cape, Bellville (South Africa)
TRIUMF, Vancouver, BC (Canada); Univ. of the West of Scotland, Scotland (United Kingdom)
Tennessee Technological Univ., Cookeville, TN (United States); Univ. of Tennessee, Knoxville, TN (United States)
Simon Fraser Univ., Burnaby, BC (Canada)
TRIUMF, Vancouver, BC (Canada); Univ. of Surrey, Guildford (United Kingdom); Bangor University (United Kingdom)
Simon Fraser Univ., Burnaby, BC (Canada); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
TRIUMF, Vancouver, BC (Canada); Michigan State Univ., East Lansing, MI (United States)
TRIUMF, Vancouver, BC (Canada); Univ. of Surrey, Guildford (United Kingdom)
TRIUMF, Vancouver, BC (Canada); Univ. of Manitoba, Winnipeg, MB (Canada)
TRIUMF, Vancouver, BC (Canada); Colorado School of Mines, Golden, CO (United States)
Centre National de la Recherche Scientifique (CNRS), Paris (France); Université Paris-Saclay, Orsay (France)
Tennessee Technological Univ., Cookeville, TN (United States)
Univ. of Surrey, Guildford (United Kingdom); National Physical Lab., Teddington (United Kingdom)
TRIUMF, Vancouver, BC (Canada); Japan Atomic Energy Agency (JAEA), Tokai (Japan)
Reed College, Portland, OR (United States); University of Notre Dame, IN (United States)
Univ. zu Koln (Germany); Florida State Univ., Tallahassee, FL (United States)

Background: Detailed spectroscopy of neutron-rich, heavy, deformed nuclei is of broad interest for nuclear astrophysics and nuclear structure. Nuclei in the r-process path and following freeze-out region impact the resulting r-process abundance distribution, and the structure of nuclei midshell in both proton and neutron number helps to understand the evolution of subshell gaps and large deformation in these nuclei. Purpose: We aim to improve the understanding of the nuclear structure of ¹⁶⁰Gd, specifically the K^π = 4⁺ bands, as well as study the β decay of ¹⁶⁰Eu into ¹⁶⁰Gd. Methods: High-statistics decay spectroscopy of ¹⁶⁰Gd resulting from the β-decay of ¹⁶⁰Eu was collected using the GRIFFIN spectrometer at the TRIUMF-ISAC facility. Results: Two new excited states and ten new transitions were observed in ¹⁶⁰Gd. The β-decaying half-lives of the low- and high-spin isomers in ¹⁶⁰Eu were determined, and the low-spin state's half-life was measured to be t_1/2 = 26.0 (8) s, ≈ 16% shorter than previous measurements. Lifetimes of the two K^π = 4⁺ bandheads in ¹⁶⁰Gd were measured for the first time, as well as γ – γ angular correlations and mixing ratios of intense transitions out of those bandheads. Conclusions: Lifetimes and mixing ratios suggest that the hexadecapole phonon model of the K^π = 4⁺ bandheads in ¹⁶⁰Gd is preferred over a simple two-state strong mixing scenario, although further theoretical calculations are needed to fully understand these states. Additionally, the 1999.0-keV state in ¹⁶⁰Gd heavily populated in β decay is shown to have positive parity, which raises questions regarding the structure of the high-spin β-decaying state in ¹⁶⁰Eu.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: AC02-05CH11231; FG02-93ER40789; SC0016988

OSTI ID:: 2234114

Alternate ID(s):: OSTI ID: 1985320

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Journal Issue: 6 Vol. 107; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Title: Decay spectroscopy of 160Eu: Quasiparticle configurations of excited states and structure of Kπ = 4+ bandheads in 160Gd

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Title: Decay spectroscopy of ¹⁶⁰Eu: Quasiparticle configurations of excited states and structure of K^π = 4⁺ bandheads in ¹⁶⁰Gd