Tracing the dynamical interplay of low-energy reaction processes of exotic nuclei using a two-center molecular continuum

Laura Moschini,Alexis Diaz-Torres

doi:10.1016/j.physletb.2021.136513

Abstract

The competition among reaction processes of a weakly-bound projectile at intermediate times of a slow collision has been unravelled. This has been done using a two-center molecular continuum within a semiclassical, time-dependent coupled-channel reaction model. Dynamical probabilities of elastic scattering, transfer and breakup agree with those derived from the direct integration of the time-dependent Schrödinger equation, demonstrating the usefulness of a two-center molecular continuum for gaining insights into the reaction dynamics of exotic nuclei.

Highlights

Understanding the physics of low-energy nuclear reactions of exotic nuclei is crucial for the experimental programmes using re-accelerated rare-isotope beams at new nuclear research facilities such as FRIB (USA), RIKEN-RIBF (Japan) and FAIR (Germany)
The central objective of the present paper is to introduce a discretised molecular continuum and to study its role in a time-dependent semiclassical framework [14, 15], similar to that used in Ref. [4], allowing us to trace the dynamical interplay of all reaction channels in direct reactions
The P -T motion is treated by classical mechanics, whereas the motion of the valence neutron relative to the overall center-of-mass of the P -T system is described by quantum mechanics

Summary

Introduction

Understanding the physics of low-energy nuclear reactions of exotic nuclei is crucial for the experimental programmes using re-accelerated rare-isotope beams at new nuclear research facilities such as FRIB (USA), RIKEN-RIBF (Japan) and FAIR (Germany). We consider a valence neutron that is initially in a loosely bound state of a projectile P impinging on a target T In this model, the P -T motion is treated by classical mechanics, whereas the motion of the valence neutron relative to the overall center-of-mass of the P -T system is described by quantum mechanics. The P -T motion is treated by classical mechanics, whereas the motion of the valence neutron relative to the overall center-of-mass of the P -T system is described by quantum mechanics This system undergoes a direct reaction, so the valence neutron is expected to be either in a bound state of P or T (elastic and transfer channels, respectively), or in the continuum of scattering states (breakup channels)

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Conclusion