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Type II shell evolution in A = 70 isobars from the N ≥ 40 island of inversion

AutorTaprogge, J. ; Morales, A. I.; Yalcinkaya, M.
Fecha de publicación14-dic-2016
EditorElsevier
CitaciónPhysics Letters - Section B 765: 328-333 (2017)
ResumenThe level structures of 70 Co and 70 Ni, populated from the β decay of 70 Fe, have been investigated using β -delayed γ -ray spectroscopy following in-flight fission of a 238 U beam. The experimental results are compared to Monte-Carlo Shell-Model calculations including the pf+g9/2+d5/2 orbitals. The strong population of a (1+) state at 274 keV in 70 Co 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 β 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. Elsevier
URIhttp://hdl.handle.net/10261/141583
DOI10.1016/j.physletb.2016.12.025
ISSN0370-2693
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