| Autor: |
Prokop, CJ, Crider, BP, Liddick, SN, Ayangeakaa, AD, Carpenter, MP, Carroll, JJ, Chen, J, Chiara, CJ, David, HM, Dombos, AC, Go, S, Harker, J, Janssens, RVF, Larson, N, Lauritsen, T, Lewis, R, Quinn, SJ, Recchia, F, Seweryniak, D, Spyrou, A, Suchyta, S, Walters, WB, Zhu, S |
| Rok vydání: |
2015 |
| Předmět: |
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| Zdroj: |
Physical Review C, vol 92, iss 6 |
| Popis: |
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 Ni68, 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 Ni70 by using β-delayed, γ-ray spectroscopy following the decay of Co70. The precipitous drop in the energy of the prolate-deformed 0+ level between Ni68 and Ni70 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 Ni70. The result extends the shape-coexistence picture in the region to Ni70 and confirms the importance of the role of the tensor component of the monopole interaction in describing the structure of neutron-rich nuclei. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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