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Identification of deformed intruder states in semi-magic Ni-70

Abstract : The structure of semi-magic Ni-70(28)42 was investigated following complementary multinucleon-transfer and secondary fragmentation reactions. Changes to the higher-spin, presumed negative-parity states based on observed gamma-ray coincidence relationships result in better agreement with shell-model calculations using effective interactions in the neutron f(5/2)pg(9/2) model space. The second 2(+) and (4(+)) states, however, can only be successfully described when proton excitations across the Z = 28 shell gap are included. Monte Carlo shell-model calculations suggest that the latter two states are part of a prolate-deformed intruder sequence, establishing an instance of shape coexistence at low excitation energies similar to that observed recently in neighboring Ni-68.
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Contributor : Emilie Bonnardel <>
Submitted on : Monday, May 4, 2015 - 9:37:51 AM
Last modification on : Wednesday, September 16, 2020 - 5:43:39 PM

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J. Chiara C., D. Weisshaar, F. Janssens R. V., Y. Tsunoda, T. Otsuka, et al.. Identification of deformed intruder states in semi-magic Ni-70. Physical Review C, American Physical Society, 2015, 91 (issue 4), pp.044309. ⟨10.1103/PhysRevC.91.044309⟩. ⟨in2p3-01148014⟩



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