Spectroscopy above the 6-qp K-isomer in 176Hf*.
Abstract
High-K yrast isomers are classic representations of the competition between independent particle and collective degrees of freedom in generating high angular momentum in a well-deformed nucleus. In 176Hf, 2-, 4- and 6-quasiparticle (qp) isomers were reported in early studies of high-K isomerism. The 6-qp Kπ = 22- yrast isomer (t1/2 = 43 μs, Ex = 4864 keV), in addition to its primary decay, exhibits a small and anomalously fast decay branch. A predicted 8-qp yrast trap at K =28 has remained elusive, primarily due to the lack of suitable beam-target combinations to bring in high angular momentum. A recoil-decay-tagging experiment using the 130Te(48Ca,2 n) reaction was performed at JYFL to search for transitions feeding the 6-qp isomer, using the JUROGAM-II plus GREAT setup. Prompt gamma rays were correlated with 176Hf implants and subsequent decays in a Ge-DSSD, with decay transitions detected in the focal plane. Results from the analysis will be presented and discussed.
*Supported in part by the U.S.D.O.E. Grants DE-FG02-94ER40848 (UML) and DE-AC02-06CH11357 (ANL).- Publication:
-
APS Division of Nuclear Physics Meeting Abstracts
- Pub Date:
- 2019
- Bibcode:
- 2019APS..DNP.LN006C