Decay Spectroscopy of <sup>160</sup>Eu: Quasiparticle Configurations and Structure in <sup>160</sup>Gd
ORAL
Abstract
Detailed spectroscopy of neutron-rich, heavy, deformed nuclei is of broad interest for nuclear astrophysics and nuclear structure. The structure of nuclei along the r-process path and in the region involved in the freeze-out impact the resulting r-process final abundance distribution. Knowledge of the structure of nuclei midshell in both proton and neutron number around mass A≈165 helps to understand the evolution of subshell gaps and deformation parameters in these nuclei and the r-process flow around the rare-Earth peak.
To study this region, high-statistics decay spectroscopy data of 160Gd resulting from the β-decay of 160Eu was collected using the GRIFFIN spectrometer at the TRIUMF-ISAC facility. Two new excited states and ten new transitions were observed in 160Gd, as well as confirmation of the majority of known β-delayed transitions in 160Gd. Lifetimes of the two Kπ=4+ band-heads in 160Gd were measured for the first time, as well as γ-γ angular correlations and mixing ratios of intense transitions out of those band-heads. These new measurements provide insight into the structure of the Kπ=4+ bands in 160Gd. Additionally, the state at 2 MeV in 160Gd, which is strongly populated in β-decay from the high-spin β-decaying state in 160Eu, is shown to have positive parity. This result raises questions regarding the established structure of the β-decaying states in 160Eu.
To study this region, high-statistics decay spectroscopy data of 160Gd resulting from the β-decay of 160Eu was collected using the GRIFFIN spectrometer at the TRIUMF-ISAC facility. Two new excited states and ten new transitions were observed in 160Gd, as well as confirmation of the majority of known β-delayed transitions in 160Gd. Lifetimes of the two Kπ=4+ band-heads in 160Gd were measured for the first time, as well as γ-γ angular correlations and mixing ratios of intense transitions out of those band-heads. These new measurements provide insight into the structure of the Kπ=4+ bands in 160Gd. Additionally, the state at 2 MeV in 160Gd, which is strongly populated in β-decay from the high-spin β-decaying state in 160Eu, is shown to have positive parity. This result raises questions regarding the established structure of the β-decaying states in 160Eu.
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Publication: D. Yates et al., Phys. Rev. C 107, 064309 (2023).
Presenters
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Daniel Yates
- TRIUMF