Abstract
Fusion cross sections with high precision have been measured for the 16 O+76 Ge and 18 O+74 Ge systems at energies near and below the Coulomb barrier. Coupled-channels calculations including inelastic excitations well reproduce the experimental fusion excitation functions and the corresponding barrier distributions. There is no evidence that the positive Q -value two-neutron transfer plays a role in the fusion process. Systematic investigations of 18 O induced fusions, whose data are available in the literature, have been performed to understand the role of two-neutron transfers with positive Q -values in the fusion process, but results are inconsistent and no conclusion can be made. The effect of two-neutron transfer with positive Q -value on sub-barrier fusion is still an open question, which becomes a challenge and requires further efforts both experimentally and theoretically.
Highlights
The coupled-channels (CC) effect plays a crucial role in heavy-ion fusion process at near- and sub-barrier energy region
In order to check the effects of neutron transfer, the CC calculation was performed by including the additional 2n-pair transfer
Fusion cross sections have been measured for the 16O+76Ge and 18O+74Ge systems at energies near and below the barrier
Summary
The coupled-channels (CC) effect plays a crucial role in heavy-ion fusion process at near- and sub-barrier energy region. The effect of positive Q-value neutron transfer (PQNT) on fusion, especially at sub-barrier energies, becomes an important topic of current interest. In the systems of 18O+92Mo, 118Sn [15,16], 36S+58Ni [17], and 58Ni+100Mo, 124Sn [18,19,20], the fusion cross sections do not show additional enhancement at sub-barrier energies due to the PQNT channels. Kohley et al [21] observed that fusion of the neutron-rich 132Sn+58Ni system, with more PQNT channels, does not cause any enhancement in the fusion cross sections down to the ∼5 mb level by means of a systematic comparison to its reference system. The latter can be used as a reference system to explore the PQNT effect on the former, where the 2n transfer is a simpler case which can be included in the CC calculations [23] as a pair transfer
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