13-17 June 2022
Berkeley, CA
US/Pacific timezone

K=4+ Band-heads in 160Gd

16 Jun 2022, 14:10
20m
Berkeley, CA

Berkeley, CA

Lawrence Berkeley National Laboratory
Oral Oral Presentations NS2022 Plenary

Speaker

Daniel Yates (TRIUMF)

Description

Detailed spectroscopy of neutron-rich, deformed rare-earth nuclei is of broad interest for nuclear structure. The structure of nuclei midshell in both proton and neutron number helps to understand the evolution of deformed subshell gaps and the interplay of single-particle and collective degrees of freedom in these nuclei. High-statistics decay spectroscopy of $^{160}$Gd resulting from the $\beta$-decay of $^{160}$Eu was performed using the GRIFFIN spectrometer at the TRIUMF-ISAC facility. An updated half-life for the $\beta$-decaying isomer in $^{160}$Eu was measured, and a number of newly observed excited states, transitions, lifetimes, $\gamma$-$\gamma$ angular correlations, and mixing ratios were measured for the first time in $^{160}$Gd. In particular, the lifetimes and angular correlations relating to the two $K^\pi=4^+$ band-heads in $^{160}$Gd were measured and shed light on the possible structure of these bands. Additionally, lifetime and mixing ratio measurements were performed for the proposed $(5^-)$ state at 1999 keV that is heavily populated by the ground-state $\beta$-decay of $^{160}$Eu. The measurements raise questions about the assigned spin and parity as well as underlying quasi-particle configurations for both the 1999 keV state in $^{160}$Gd and the ground-state of the parent $^{160}$Eu.

In this talk, I will discuss the new measurements and implications on the $K^\pi=4^+$ bands in regards to the interpretation of these bands as being strongly-mixed quasi-particle configurations versus hexadecapole vibrational bands, as well as an updated proposal for the configuration of the ground-state of the parent $^{160}$Eu.

Primary authors

Daniel Yates (TRIUMF) Dr Reiner Kruecken (TRIUMF) Prof. Iris Dillmann (TRIUMF) Prof. Paul Garrett (University of Guelph)

Co-authors

Dr Fuad Ali (University of Guelph) Prof. Corina Andreoiu (Simon Fraser University) William Ashfield (University of Montana) Dr Gordon Ball (TRIUMF) Z Beadle Dr Nikita Bernier (TRIUMF) Soumendu Bhattacharjee (CTU Prague) Mr Harris Bidaman (University of Guelph) Dr Vinzenz Bildstein (University of Guelph) Daryl Bishop (TRIUMF) Dr Michael Bowry (University of West of Scotland) Dr Roger Caballero-Folch (TRIUMF) Donald Chaney (University of Tennessee) David Cross Ms Alejandra Diaz Varela (University of Guelph) Michelle Dunlop Ryan Dunlop Lee Evitts (Bangor University) Fatima Garcia (LBNL) Prof. Adam Garnsworthy (TRIUMF) Shaun Georges (TRIUMF) Stephen Gillespie (FRIB) Prof. Greg Hackman (TRIUMF) Jack Henderson (University of Surrey) Dr Badamsambu Jigmeddorj (University of Guelph) Jens Lassen (TRIUMF) Ruohong Li (TRIUMF) Ben Luna (University of Tennessee) Andrew MacLean (University of Guelph) Connor Natzke (TRIUMF) Dr Bruno Olaizola (TRIUMF) Costel Petrache (University of Paris-Saclay) Ms Allison Radich (University of Guelph) Mustafa Rajabali (Tennessee Technological University) Patrick Regan (University of Surrrey) Mr Yukiya Saito (TRIUMF) Dr James Smallcombe (University of Liverpool) Jenna Smith (Northwestern University) Dr Mark Spieker (FSU) Prof. Carl Svensson (University of Guelph) Andrea Teigelhofer (TRIUMF) Dr Kenneth Whitmore (Simon Fraser University) Victoria Vedia (TRIUMF) Mrs Tammy Zidar (University of Guelph)

Presentation Materials