Abstract
An experiment populating low/medium-spin states in Dy156 was performed to investigate the possibility of tetrahedral symmetry in this nucleus. In particular, focus was placed on the low-spin, negative-parity states since recent theoretical studies suggest that these may be good candidates for this high-rank symmetry. The states were produced in the Nd148(C12,4n) reaction and the Gammasphere array was utilized to detect the emitted γ rays. B(E2)/B(E1) ratios of transition probabilities from the low-spin, negative-parity bands were determined and used to interpret whether these structures are best associated with tetrahedral symmetry or, as previously assigned, to octupole vibrations. In addition, several other negative-parity structures were observed to higher spin and two new sequences were established.
| Original language | English |
|---|---|
| Article number | 014321 |
| Journal | Physical Review C |
| Volume | 95 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 20 2017 |
Funding
The authors thank the ANL operations staff at Gammasphere and gratefully acknowledge the efforts of J. P. Greene for target preparation. We thank D. C. Radford and H. Q. Jin for their software support. This work is funded by the National Science Foundation under Grant Nos. PHY-1203100 (USNA) and PHY-0754674 (FSU), as well as by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357 (ANL), and under award nos. DE-FG02-94ER40848 (UML), DE-FG02-96ER40983 (UT), DE-FG02-91ER40609 (Yale), DE-AC02-98CD10886 (BNL), and DE-FG02-94ER40834 (UM). J.S. would like to acknowledge the support of the UK Science and Technology Council (STFC). J.F.S-S. acknowledges support from the Joyce Frances Adlard Cultural Fund, and S.T.N.M. acknowledges the South African National Research Foundation. This research used resources of Argonne National Laboratory's ATLAS facility, which is a U.S. Department of Energy Office of Science User Facility.