Examining the role of transfer coupling in sub-barrier fusion of Ti-46,Ti-50+Sn-124

作者：Liang J F^*; Allmond J M; Gross C J; Mueller P E; Shapira D; Varner R L; Dasgupta M; Hinde D J; Simenel C; Williams E; Vo Phuoc K; Brown M L; Carter I P; Evers M; Luong D H; Ebadi T; Wakhle A

来源：PHYSICAL REVIEW C, 2016, 94(2): 024616.

DOI：10.1103/PhysRevC.94.024616

Background: The presence of neutron transfer channels with positive Q values can enhance sub-barrier fusion cross sections. Recent measurements of the fusion excitation functions for Ni-58+Sn-132,Sn-124 found that the fusion enhancement due to the influence of neutron transfer is smaller than that in Ca-40+Sn-132,Sn-124 although the Q values for multineutron transfer are comparable.
Purpose: To investigate the differences observed between the fusion of Sn + Ni and Sn + Ca.
Methods: Fusion excitation functions for Ti-46,Ti-50+Sn-124 have been measured at energies near the Coulomb barrier.
Results: A comparison of the barrier distributions for Ti-46+Sn-124 and Ca-40+Sn-124 shows that the Ca-40+Sn-124 system has a barrier strength resulting from the coupling to the very collective octupole state in Ca-40 at an energy significantly lower than the uncoupled barrier.
Conclusions: The large sub-barrier fusion enhancement in Ca-40 induced reactions is attributed to both couplings to neutron transfer and inelastic excitation, with the octupole vibration of Ca-40 playing a major role.

• 出版日期2016-8-24