Low-lying excitations in Ni-72
Tarih
2016Yazar
CAMERA, F.
Daido, R.
DOORNENBAL, P.
Fang, Y.
LORUSSO, G.
SAHIN, E.
SOHLER, D.
SHAFFNER, H.
TANIUCHI, R.
TAPROGGE, J.
VAJTA, ZS
VALIENTE-DOBON, J. J.
WIELAND, O.
Yalcinkaya, Mehtap
MOMIYAMA, S.
NAPOLI, D. R.
NIIKURA, M.
ORLANDI, R.
SAKURAI, H.
PATEL, Z.
RICE, S.
SINCLAIR, L.
SOEDERSTROEM, P-A
Sumikama, T.
WU, J.
MATSUI, K.
MELON, B.
MENGONI, D.
MIYAZAKI, T.
MODAMIO-HOYBORG, V.
XU, Z. Y.
Yagi, A.
YOKOYAMA, R.
BABA, H.
AVIGO, R.
GARROTE, F. L. Bello
BLASI, N.
BRACCO, A.
CERUTI, S.
CRESPI, F. C. L.
DE ANGELIS, G.
DELATTRE, M. -C.
DOMBRADI, Zs.
GOTTARDO, A.
ISOBE, T.
KOJOUHAROV, I.
KURZ, N.
KUTI, I.
MORALES, A. I.
BENZONI, G.
WATANABE, H.
NISHIMURA, S.
BROWNE, F.
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Low-lying excited states in Ni-72 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 beta decay from Co-72 to Ni-72, and has provided first experimental information on the decay sequence Fe-72 -> Co-72 -> Ni-72 and on the delayed neutron-emission branch Co-73 -> Ni-72. Accordingly, we report nearly 60 previously unobserved gamma transitions which deexcite 21 new levels in Ni-72. 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 beta-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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