New low-energy state and shape coexistence in
- Michigan State Univ., East Lansing, MI (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- U.S. Army Research Laboratory, Adelphi, MD (United States)
- Univ. of Tennessee, Knoxville, TN (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Maryland, College Park, MD (United States)
- Università degli Studi di Padova (Italy)
- Univ. of California, Berkeley, CA (United States)
- Univ. of Maryland, College Park, MD (United States)
We report that in recent models, the neutron-rich Ni isotopes around N=40 are predicted to exhibit multiple low-energy excited 0+ states attributed to neutron and proton excitations across both the N=40 and Z=28 shell gaps. In 68Ni, the three observed 0+ states have been interpreted in terms of triple shape coexistence between spherical, oblate, and prolate deformed shapes. In the present work a new (02+) state at an energy of 1567 keV has been discovered in 70Ni by using β-delayed, γ-ray spectroscopy following the decay of 70Co. The precipitous drop in the energy of the prolate-deformed 0+ level between 68Ni and 70Ni with the addition of two neutrons compares favorably with results of Monte Carlo shell-model calculations carried out in the large fpg9/2d5/2 model space, which predict a 02+ state at 1525 keV in 70Ni. Finally, the result extends the shape-coexistence picture in the region to 70Ni and confirms the importance of the role of the tensor component of the monopole interaction in describing the structure of neutron-rich nuclei.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Nuclear Physics (NP)
- Grant/Contract Number:
- AC02-05CH11231; NA0000979; NA0002132; FG52-08NA28552; AC06-CH11357; FG02-94ER40834; FG02- 96ER40983; FG02-96ER40983
- OSTI ID:
- 1480699
- Alternate ID(s):
- OSTI ID: 1233876
- Journal Information:
- Physical Review C, Nuclear Physics, Vol. 92, Issue 6; ISSN 0556-2813
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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