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

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 6 He and 11 Li, 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 6 He and 11 Li. We compute the He 6 ( p , t ) 4 He and Li 11 ( p , t ) 9 Li cross sections at the DWBA, and compare them with experiments. For 11 Li we also determine the Li 11 ( p , t ) 9 Li ⁎ cross section which involves the first excited state of 9 Li. A fair agreement with experiment is obtained, considering that no parameter is adjusted.