arXiv:1402.5944·v1·Nuclear Experiment
Nuclear Structure Towards N=40 60Ca: In-beam gamma-ray Spectroscopy of 58,60Ti
A. Gade🇺🇸 · R. V. F. Janssens🇺🇸 · D. Weisshaar🇺🇸 · B. A. Brown🇺🇸 · E. Lunderberg🇺🇸 · M. Albers🇺🇸 · V. M. Bader🇺🇸 · T. Baugher🇺🇸 · D. Bazin🇺🇸 · J. S. Berryman🇺🇸 · C. M. Campbell🇺🇸 · M. P. Carpenter🇺🇸
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}.
Comments: Accepted for publication in Physical Review letters