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

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• 作者：A.I. Morales^a ; ^b ; ^{Ana.Morales@ific.uv.es} ; G. Benzoni^a ; H. Watanabe^c ; ^d ; Y. Tsunoda^e ; T. Otsuka^f ; ^g ; ^h ; S. Nishimura^d ; F. Browneⁱ ; ^d ; R. Daido^j ; P. Doornenbal^d ; Y. Fang^j ; G. Lorusso^d ; Z. Patel^k ; ^d ; S. Rice^k ; ^d ; L. Sinclair^l ; ^d ; P.-A. Sö ; derströ ; m^d ; T. Sumikama^m ; J. Wu^d ; Z.Y. Xu^f ; ^d ; A. Yagi^j ; R. Yokoyama^f ; H. Baba^d ; R. Avigo^a ; ^b ; F.L. Bello Garroteⁿ ; N. Blasi^a ; A. Bracco^a ; ^b ; F. Camera^a ; ^b ; S. Ceruti^a ; ^b ; F.C.L. Crespi^a ; ^b ; G. de Angelis^o ; M.-C. Delattre^p ; Zs. Dombradi^q ; A. Gottardo^o ; T. Isobe^d ; I. Kojouharov^r ; N. Kurz^r ; I. Kuti^q ; K. Matsui^f ; B. Melon^s ; D. Mengoni^t ; ^u ; T. Miyazaki^f ; V. Modamio-Hoybjor^o ; S. Momiyama^f ; D.R. Napoli^o ; M. Niikura^f ; R. Orlandi^h ; ^v ; H. Sakurai^d ; ^f ; E. Sahinⁿ ; D. Sohler^q ; H. Schaffner^r ; R. Taniuchi^f
• 刊名：Physics Letters B
• 出版年：2017
• 出版时间：10 February 2017
• 年：2017
• 卷：765
• 期：Complete
• 页码：328-333
• 全文大小：856 K
• 卷排序：765

文摘

The level structures of 70Co and 70Ni, populated from the β decay of 70Fe, have been investigated using β-delayed γ-ray spectroscopy following in-flight fission of a 238U beam. The experimental results are compared to Monte-Carlo Shell-Model calculations including the pf+g9/2+d5/2pf+g9/2+d5/2 orbitals. The strong population of a (1+)(1+) state at 274 keV in 70Co 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=70A=70 isobars from the new island of inversion to the Z=28Z=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.