Low-lying excitations in Ni

Morales, A. I.*; Benzoni, G.*; Watanabe, H.*; Nishimura, Shunji*; Browne, F.*; Daido, R.*; Doornenbal, P.*; Fang, Y.*; Lorusso, G.*; Patel, Z.*; Rice, S.*; Sinclair, L.*; Sderstrm, P.-A.*; Sumikama, Toshiyuki*; Wu, J.*; Xu, Z. Y.*; Yagi, A.*; Yokoyama, R.*; Baba, Hidetada*; Avigo, R.*; Bello Garrote, F. L.*; Blasi, N.*; Bracco, A.*; Camera, F.*; Ceruti, S.*; Crespi, F. C. L.*; De Angelis, G.*; Delattre, M.-C.*; Dombrdi, 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, Megumi*; Orlandi, R.  ; Sakurai, Hiroyoshi*; Sahin, E.*; Sohler, D.*; Shaffner, H.*; Taniuchi, Ryo*; Taprogge, J.*; Vajta, Zs.*; Valiente-Dobn, J. J.*; Wieland, O.*; Yalcinkaya, M.*

Low-lying excited states in Ni have been investigated at RIKEN by studying the decay of Co to Ni. Co was separated with BigRIPS, implanted into the WaS3ABi Silicon array, and the ray measured using the EURICA spectrometer. From the analysis, 60 new -ray transitions and 21 new levels in Ni were observed. The new experimental information is compared to shell-model calculations which include neutron excitation across the shell. The calculations reproduce rather well the observed states, implying that a clear understanding of these low-lying excitations has been achieved.