Type II shell evolution in A=70 isobars from the N >= 40 island of inversion
Yazar
Sumikama, T.
BLASI, N.
BRACCO, A.
CAMERA, F.
CERUTI, S.
CRESPI, F. C. L.
DE ANGELIS, G.
DELATTRE, M. -C.
DOMBRADI, Zs.
GOTTARDO, A.
ISOBE, T.
KOJOUHAROV, I.
KURZ, N.
KUTI, I.
MATSUI, K.
MELON, B.
MENGONI, D.
MIYAZAKI, T.
MODAMIO-HOYBJOR, V.
MOMIYAMA, S.
NAPOLI, D. R.
NIIKURA, M.
ORLANDI, R.
SAKURAI, H.
SAHIN, E.
SOHLER, D.
SCHAFFNER, H.
TANIUCHI, R.
TAPROGGE, J.
VAJTA, Zs.
MORALES, A. I.
BENZONI, G.
WATANABE, H.
TSUNODA, Y.
OTSUKA, T.
NISHIMURA, S.
BROWNE, F.
Daido, R.
DOORNENBAL, P.
Fang, Y.
LORUSSO, G.
PATEL, Z.
RICE, S.
SINCLAIR, L.
SODERSTROM, P. -A.
WU, J.
XU, Z. Y.
VALIENTE-DOBON, J. J.
WIELAND, O.
Yalcinkaya, Mehtap
Yagi, A.
YOKOYAMA, R.
BABA, H.
AVIGO, R.
GARROTE, F. L. Bello
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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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