Nuclear structure of Ni from the (,) reaction

Elekes, Z.*; Kripk, *; Sohler, D.*; Sieja, K.*; Ogata, Kazuyuki*; Yoshida, Kazuki   ; Doornenbal, P.*; Obertelli, A.*; Authelet, G.*; Baba, Hidetada*; Calvet, D.*; Chteau, F.*; Corsi, A.*; Delbart, A.*; Gheller, J.-M.*; Gillibert, A.*; Isobe, T.*; Lapoux, V.*; Matsushita, Masafumi*; Momiyama, Satoru*; Motobayashi, Toru*; Otsu, Hideaki*; Pron, C.*; Peyaud, A.*; Pollacco, E. C.*; Rouss, J.-Y.*; Sakurai, Hiroyoshi*; Santamaria, C.*; Shiga, Y.*; Takeuchi, S.*; Taniuchi, R.*; Uesaka, T.*; Wang, H.*; Yoneda, Kenichiro*; Browne, F.*; Chung, L. X.*; Dombrdi, Zs.*; Flavigny, F.*; Franchoo, S.*; Giacoppo, F.*; Gottardo, A.*; Hadyska-Klk, K.*; Korkulu, Z.*; Koyama, S.*; Kubota, Y.*; Lee, J.*; Lettmann, M.*; Louchart, C.*; Lozeva, R.*; Matsui, Keishi*; Miyazaki, T.*; Niikura, Megumi*; Nishimura, Shunji*; Olivier, L.*; Ota, Shinsuke*; Patel, Z.*; Sahin, E.*; Shand, C.*; Sderstrm, P.-A.*; Stefan, I.*; Steppenbeck, D.*; Sumikama, Toshiyuki*; Suzuki, Daisuke*; Vajta, Zs.*; Werner, V.*; Wu, J.*; Xu, Z.*

The nuclear structure of the Ni nucleus was investigated by (,) reaction using a NaI(Tl) array to detect the deexciting prompt rays. A new transition with an energy of 2227 keV was identified by and coincidences. Our shell-model calculations using the Lenzi, Nowacki, Poves, and Sieja interaction produced good candidates for the experimental proton hole states in the observed energy region, and the theoretical cross sections showed good agreement with the experimental values. Although we could not assign all the experimental states to the theoretical ones unambiguously, the results are consistent with a reasonably large Z = 28 shell gap for nickel isotopes in accordance with previous studies.