Subbarrier fusion reactions and many-particle quantum tunneling

TL;DR

This paper reviews the role of quantum tunneling and coupling effects in low-energy heavy-ion fusion reactions, emphasizing the coupled-channels approach and barrier distribution methods, with applications to surface science phenomena.

Contribution

It provides a comprehensive review of theoretical models for subbarrier fusion, highlighting the importance of multi-channel couplings and barrier distribution techniques.

Findings

Couplings significantly enhance fusion probabilities below the Coulomb barrier.

Barrier distribution methods effectively analyze multi-channel tunneling processes.

Applications extend to dissociative adsorption in surface science.

Abstract

Low energy heavy-ion fusion reactions are governed by quantum tunneling through the Coulomb barrier formed by a strong cancellation of the repulsive Coulomb force with the attractive nuclear interaction between the colliding nuclei. Extensive experimental as well as theoretical studies have revealed that fusion reactions are strongly influenced by couplings of the relative motion of the colliding nuclei to several nuclear intrinsic motions. Heavy-ion subbarrier fusion reactions thus provide a good opportunity to address a general problem on quantum tunneling in the presence of couplings, which has been a popular subject in the past decades in many branches of physics and chemistry. Here we review theoretical aspects of heavy-ion subbarrier fusion reactions from the view point of quantum tunneling in systems with many degrees of freedom. Particular emphases are put on the coupled-channels approach to fusion reactions, and the barrier distribution representation for multi-channel penetrability. We also discuss an application of the barrier distribution method to elucidation of the mechanism of dissociative adsorption of H$_2$ melecules in surface science.