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Identification of deformed intruder states in semi-magic $$^{70}$$Ni

Chiara, C. J.*; Weisshaar, D.*; Janssens, R. V. F.*; Tsunoda, Yusuke*; Otsuka, Takaharu*; Harker, J. L.*; Walters, W. B.*; Recchia, F.*; Albers, M.*; Alcorta, M.*; Bader, V. M.*; Baugher, T.*; Bazin, D.*; Berryman, J. S.*; Bertone, P. F.*; Campbell, C. M.*; Carpenter, M. P.*; Chen, J.*; Crawford, H. L.*; David, H. M.*; Doherty, D. T.*; Gade, A.*; Hoffman, C. R.*; Homma, Michio*; Kondev, F. G.*; Korichi, A.*; Langer, C.*; Larson, N.*; Lauritsen, T.*; Liddick, S. N.*; Lunderberg, E.*; Macchiavelli, A. O.*; Noji, Shumpei*; Prokop, C. J.*; Rogers, A. M.*; Seweryniak, D.*; Shimizu, Noritaka*; Stroberg, S. R.*; Suchyta, S.*; Utsuno, Yutaka; Williams, S.*; Wimmer, K.*; Zhu, S.*

The neutron-rich isotope $$^{70}$$Ni was produced by multi-nucleon transfer reactions of $$^{70}$$Zn in the Argonne National Laboratory, and an in-beam $$gamma$$-ray experiment were performed using the GRETINA array. The $$2^+_2$$ and $$4^+_2$$ levels of $$^{70}$$Ni were observed for the first time. Those levels are regarded as large deformed states associated with proton excitation from the $$f_{7/2}$$ orbit because they cannot be reproduced by a shell-model calculation assuming a small valence space without $$f_{7/2}$$. A theoretical analysis based on the Monte Carlo shell model published in 2014 indicates that those levels corresponds to a prolate deformed band. The present result demonstrates the occurrence of shape coexistence in neutron-rich Ni isotopes other than a known case of $$^{68}$$Ni, and confirms the predictive power of the Monte Carlo shell-model calculation.

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Category:Physics, Nuclear

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