Microscopic study of halo nuclei through (p,t) reactions

TL;DR

This paper uses a semi-microscopic RGM approach to analyze (p,t) reactions involving halo nuclei 6He and 11Li, providing overlap integrals and cross sections that agree reasonably with experimental data without fitting parameters.

Contribution

It introduces a parameter-free, microscopic cluster model based on RGM for studying (p,t) reactions in halo nuclei, including excited states.

Findings

Overlap integrals and spectroscopic factors for 6He and 11Li are computed.

Calculated cross sections for 6He(p,t)alpha and 11Li(p,t)9Li show fair agreement with experiments.

The model accurately describes the long-range wave function of halo nuclei.

Abstract

We analyze (p,t) two-neutron transfer reactions in a semi-microscopic model. The overlap integrals of the target nucleus are calculated in a microscopic cluster model. The Resonating Group Method (RGM) assumes a cluster structure of the nucleus, and is well adapted to halo nuclei since the long-range part of the wave function is accurately described. We focus on (p,t) reactions involving 6He and 11Li, which are well known core+n+n halo nuclei. The RGM is based on a nucleon-nucleon interaction, and therefore does not involve any fitting procedure. It also provides overlap integrals of excited states of the core nucleus. We present overlap integrals and spectroscopic factors of 6He and 11Li. We compute the 6He(p,t)alpha and 11Li(p,t)9Li cross sections at the DWBA, and compare them with experiments. For 11Li we also determine the 11Li(p,t)9Li* cross section which involves the first excited states of 9Li. A fair agreement with experiment is obtained, considering that no parameter is adjusted.