Abstract
Fusion cross-section measurements were performed for system 40 Ca + 70 Zn around the Coulomb barrier energies using Heavy Ion Reaction Analyzer (HIRA). The observed enhancement in experimental fusion cross-sections was investigated via coupled-channels formalism. The coupling of inelastic excitations alone could not reproduce the experimental data, however, the effect of octupole state of the projectile was observed to be significant. The multi-neutron positive Q-value transfer channels were also included in the calculations using semi-classical model. It was observed that two neutrons pick-up channel gave a major contribution to the fusion enhancement and successfully reproduce the experimental data at above as well as below barrier energies. The coupling of more than two neutrons transfer could not give any significant enhancement to subbarrier fusion.
Highlights
The fusion reaction is an extensively studied phenomenon at and near the Coulomb barrier
Considering all the above observations, in order to explore the effect of transfer channels on fusion enhancement, 40Ca + 70Zn system was selected for the present study. 40Ca is a doubly magic nucleus, octupole state was shown to be an important state for 40Ca [17]
The experimental fusion cross-sections were extracted and compared with the theoretical calculated cross-sections based on coupled-channels formalism as shown in figure 1
Summary
The fusion reaction is an extensively studied phenomenon at and near the Coulomb barrier. A numerous investigations were performed in past years with various systems which showed a large enhancement of fusion crosssections in comparison with theoretical predictions at subbarrier energies [1]. It was demonstrated under the framework of coupled-channels (CC) formalism that fusion is influenced by inelastic excitations of colliding nuclei and transfer of neutrons [2]. Considering all the above observations, in order to explore the effect of transfer channels on fusion enhancement, 40Ca + 70Zn system was selected for the present study. The system has positive Q-value for seven neutrons pick-up channels (2n-8n), importance of multi-neutron transfer on fusion can be examined with this system. The Q-values for 2n to 8n pick-up channels are 4.14, 1.88, 5.96, 2.31, 4.73, 0.14 and 0.98 MeV respectively
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