Multi-neutron transfer coupling in sub-barrier 32S+90,96Zr fusion reactions

TL;DR

This study investigates how neutron transfer influences sub-barrier fusion reactions, demonstrating that including multi-neutron transfer couplings in models accurately reproduces experimental fusion cross sections for specific sulfur and zirconium systems.

Contribution

It introduces a detailed coupled-channel calculation incorporating multi-neutron transfer couplings, improving the understanding of sub-barrier fusion enhancement in neutron-rich systems.

Findings

Neutron transfer significantly enhances fusion cross sections at sub-barrier energies.

Coupled-channel calculations with neutron transfer couplings match experimental data.

Similar effects observed in calcium-zirconium fusion reactions.

Abstract

The role of neutron transfers is investigated in the fusion process below the Coulomb barrier by analyzing 32S+90Zr and 32S+96Zr as benchmark reactions. A full coupled-channel calculation of the fusion excitation functions has been performed for both systems by using multi-neutron transfer coupling for the more neutron-rich reaction. The enhancement of fusion cross sections for 32S+96Zr is well reproduced at sub-barrier energies by NTFus code calculations including the coupling of the neutron-transfer channels following the Zagrebaev semiclassical model. We found similar effects for 40Ca+90Zr and 40Ca+96Zr fusion excitation functions.