Yates, D; Krucken, R; Dillmann, I; Garrett, P E; Olaizola, B; Vedia, V; Ali, F A; Andreoiu, C; Ashfield, W; Ball, G C; Beadle, Z; Bernier, N; Bhattacharjee, S S; Bidaman, H; Bildstein, V; Bishop, D; Bowry, M; Burbadge, C; Caballero-Folch, R; Chaney, D Z; Cross, D C; Diaz Varela, A; Dunlop, M R; Dunlop, R; Evittts, L J; Garcia, F H; Garnsworthy, A B; Georges, S; Gillespie, S A; Hackman, G; Henderson, J; Jigmeddorf, B; Lassen, J; Li, R; Luna, B K; MacLean, A D; Natzke, C R; Petrache, C M; Radich, A J; Rajabali, M M; Regan, P H; Saito, Y; Smallcombe, J; Smith, J K; Spieker, M; Svensson, C E; Teigelhofer, A; Whitmore, K; Zidar, T (2023) Decay Spectroscopy of 160Eu: Quasiparticle Configurations of Excited States and Structure of Kπ=4+ Band-heads in 160Gd. Physical Review C, 107 (6). 064309

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Abstract

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: To improve the understanding of the nuclear structure of 160Gd, specifically the Kπ=4+ bands, as well as study the beta-decay of 160Eu into 160Gd.

Methods: High-statistics decay spectroscopy of 160Gd resulting from the beta-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 beta-decaying half-lives of the low- and high-spin isomer in 160Eu were determined, and the low-spin state's half-life was measured to be t1=2 = 26:0(8) s, ≈16% shorter than previous measurements. Lifetimes of the two Kπ=4+ band-heads in 160Gd were measured for the first time, as well as - angular correlations and mixing ratios of intense transitions out of those band-heads.

Conclusions: Lifetimes and mixing ratios suggest that the hexadecapole phonon model of the Kπ=4+ band-heads in 160Gd is referred 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 beta-decay is shown to have positive parity, which raises questions regarding the structure of the high-spin beta-decaying state in 160Eu.

Item Type:	Article
Keywords:	nuclear, radioactivity, gamma-ray spectroscopy
Subjects:	Ionising Radiation > Radioactivity
Divisions:	Medical, Marine & Nuclear
Identification number/DOI:	10.1103/PhysRevC.107.064309
Last Modified:	09 Sep 2024 13:22
URI:	https://eprintspublications.npl.co.uk/id/eprint/10002