Low-lying excitations in Ni72

Abstract : Low-lying excited states in Ni72 have been investigated in an in-flight fission experiment at the RIBF facility of the RIKEN Nishina Center. The combination of the state-of-the-art BigRIPS and EURICA setups has allowed for a very accurate study of the β decay from Co72 to Ni72, and has provided first experimental information on the decay sequence Fe72→Co72→Ni72 and on the delayed neutron-emission branch Co73→Ni72. Accordingly, we report nearly 60 previously unobserved γ transitions which deexcite 21 new levels in Ni72. Evidence for the location of the so-sought-after (4+2),(6+2), and (8+1) seniority states is provided. As well, the existence of a low-spin β-decaying isomer in odd-odd neutron-rich Co isotopes is confirmed for mass A=72. The new experimental information is compared to simple shell-model calculations including only neutron excitations across the fpg shells. It is shown that, in general, the calculations reproduce well the observed states.
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Submitted on : Wednesday, July 6, 2016 - 3:19:18 PM
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A. I. Morales, G. Benzoni, H. Watanabe, S. Nishimura, F. Browne, et al.. Low-lying excitations in Ni72. Physical Review C, American Physical Society, 2016, 93 (3), pp.034328. ⟨10.1103/PhysRevC.93.034328⟩. ⟨in2p3-01342675⟩



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