Nuclear Structure Towards N=40 60Ca: In-beam gamma-ray Spectroscopy of 58,60Ti

Authors :: Gade, A.
Janssens, R. V. F.
Weisshaar, D.
Brown, B. A.
Lunderberg, E.
Albers, M.
Bader, V. M.
Baugher, T.
Bazin, D.
Berryman, J. S.
Campbell, C. M.
Carpenter, M. P.
Chiara, C. J.
Crawford, H. L.
Cromaz, M.
Garg, U.
Hoffman, C. R.
Kondev, F. G.
Langer, C.
Lauritsen, T.
Lee, I. Y.
Lenzi, S. M.
Matta, J. T.
Nowacki, F.
Recchia, F.
Sieja, K.
Stroberg, S. R.
Tostevin, J. A.
Williams, S. J.
Wimmer, K.
Zhu, S.
Publication Year :: 2014
Publisher :: arXiv, 2014.
Abstract: Excited states in the neutron-rich N=38,36 nuclei \nuc{60}{Ti} and \nuc{58}{Ti} were populated in nucleon-removal reactions from \nuc{61}{V} projectiles at 90~MeV/nucleon. The \gamma-ray transitions from such states in these Ti isotopes were detected with the advanced \gamma-ray tracking array GRETINA and were corrected event-by-event for large Doppler shifts (v/c \sim 0.4) using the \gamma-ray interaction points deduced from online signal decomposition. The new data indicate that a steep decrease in quadrupole collectivity occurs when moving from neutron-rich N=36,38 Fe and Cr toward the Ti and Ca isotones. In fact, \nuc{58,60}{Ti} provide some of the most neutron-rich benchmarks accessible today for calculations attempting to determine the structure of the potentially doubly-magic nucleus \nuc{60}{Ca}.<br />Comment: Accepted for publication in Physical Review letters