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

作者：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

来源：Physical Review Letters, 2014, 112(11): 112503.

DOI：10.1103/PhysRevLett.112.112503

Excited states in the neutron-rich N = 38, 36 nuclei Ti-60 and Ti-58 were populated in nucleon-removal reactions from V-61 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 (nu/c similar to 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, Ti-58,Ti- 60 provide some of the most neutron-rich benchmarks accessible today for calculations attempting to determine the structure of the potentially doubly magic nucleus Ca-60.

• 出版日期2014-3-21