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

被引：24
|
作者：
Liang, J. F. [1 ,3 ]
Allmond, J. M. [1 ]
Gross, C. J. [1 ]
Mueller, P. E. [1 ]
Shapira, D. [1 ]
Varner, R. L. [1 ]
Dasgupta, M. [2 ]
Hinde, D. J. [2 ]
Simenel, C. [2 ]
Williams, E. [2 ]
Vo-Phuoc, K. [2 ]
Brown, M. L. [2 ]
Carter, I. P. [2 ]
Evers, M. [2 ,4 ]
Luong, D. H. [2 ]
Ebadi, T. [2 ,5 ]
Wakhle, A. [2 ,6 ]
机构：
[1] Oak Ridge Natl Lab, Div Phys, Oak Ridge, TN 37831 USA
[2] Australian Natl Univ, Dept Nucl Phys, Res Sch Phys Sci & Engn, Canberra, ACT 2601, Australia
[3] FLIR Syst Inc, Wilsonville, OR USA
[4] Australian Natl Univ, John Curtin Sch Med Res, Canberra, ACT, Australia
[5] Seeing Machines, Canberra, ACT, Australia
[6] MSU, Natl Superconducting Cyclotron Lab, Tirunelveli, Tamil Nadu, India
来源：
PHYSICAL REVIEW C | 2016年 / 94卷 / 02期
基金：
澳大利亚研究理事会;
关键词：
HEAVY-ION FUSION; COULOMB BARRIER; CA-40+SN-124; FISSION; NUCLEI; ENERGY; STATE;
D O I：
10.1103/PhysRevC.94.024616
中图分类号：
O57 [原子核物理学、高能物理学];
学科分类号：
070202 ;
摘要：
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.
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页数：9
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