First Evidence of Axial Shape Asymmetry and Configuration Coexistence in 74Zn : Suggestion for a Northern Extension of the N = 40 Island of Inversion
- Rocchini, M.
- Garrett, P. E.
- Zielińska, M.
- Lenzi, S. M.
- Dao, D. D.
- Nowacki, F.
- Bildstein, V.
- MacLean, A. D.
- Olaizola, B.
- Ahmed, Z. T.
- Andreoiu, C.
- Babu, A.
- Ball, G. C.
- Bhattacharjee, S. S.
- Bidaman, H.
- Cheng, C.
- Coleman, R.
- Dillmann, I.
- Garnsworthy, A. B.
- Gillespie, S.
- Griffin, C. J.
- Grinyer, G. F.
- Hackman, G.
- Hanley, M.
- Illana, A.
- Jones, S.
- Laffoley, A. T.
- Leach, K. G.
- Lubna, R. S.
- McAfee, J.
- Natzke, C.
- Pannu, S.
- Paxman, C.
- Porzio, C.
- Radich, A. J.
- Rajabali, M. M.
- Sarazin, F.
- Schwarz, K.
- Shadrick, S.
- Sharma, S.
- Suh, J.
- Svensson, C. E.
- Yates, D.
- Zidar, T.
DOIAbstract
The excited states of N=44 74Zn were investigated via γ-ray spectroscopy following 74Cu β decay. By exploiting γ−γ angular correlation analysis, the 2+2, 3+1, 0+2, and 2+3 states in 74Zn were firmly established. The γ-ray branching and E2/M1 mixing ratios for transitions deexciting the 2+2, 3+1, and 2+3 states were measured, allowing for the extraction of relative B(E2) values. In particular, the 2+3→0+2 and 2+3→4+1 transitions were observed for the first time. The results show excellent agreement with new microscopic large-scale shell-model calculations, and are discussed in terms of underlying shapes, as well as the role of neutron excitations across the N=40 gap. Enhanced axial shape asymmetry (triaxiality) is suggested to characterize 7...
Add to ORKG