Journal
PHYSICS LETTERS B
Volume 765, Issue -, Pages 328-333Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2016.12.025
Keywords
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Funding
- Rare Isotope Science Project (RISP) of the Institute for Basic Science (IBS) - Ministry of Science, ICT and Future Planning (MSIP)
- National Research Foundation (NRF) of South Korea [2013M7A1A1075764]
- RIKEN AICS [hp150224]
- European Union
- European Social Fund
- Italian Ministero dell'Istruzione, dell'Universita e della Ricerca through Programmi di Ricerca Scientifica di Rilevante Interesse Nazionale (PRIN) [2001024324_01302]
- NuPNET-ERANET within the NuPNET GANAS project [202914]
- European Union [262010 ENSAR-INDESYS]
- Spanish Ministerio de Ciencia e Innovacion [FPA2009-13377-C02, FPA2011-29854-C04]
- Hungarian Research Fund OTKA contract [K100835, K106035]
- European Commission through the Marie Curie Actions Contract [PIEFGA-2001-30096]
- Japanese JSPS KAKENHI Grants [24740188, 25247045]
- Grants-in-Aid for Scientific Research [25247045, 26800117, 15J08882, 16F16323, 14J08718, 24105004] Funding Source: KAKEN
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The level structures of Co-70 and Ni-70, populated from the Chi decay of Fe-70, have been investigated using beta-delayed gamma-ray spectroscopy following in-flight fission of a U-238 beam. The experimental results are compared to Monte-Carlo Shell-Model calculations including the pf + g(9/2) + d(5/2) orbitals. The strong population of a (1(+)) state at 274 keV in Co-70 is at variance with the expected excitation energy of 1 MeV from near spherical single-particle estimates. This observation indicates a dominance of prolate deformed intruder configurations in the low-lying levels, which coexist with the normal near spherical states. It is shown that the 13 decay of the neutron-rich A = 70 isobars from the new island of inversion to the Z = 28 closed-shell regime progresses in accordance with a newly reported type of shell evolution, the so-called Type II, which involves many particle-hole excitations across energy gaps. (C) 2016 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license.
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