Speaker
Description
A considerable amount of current lively research is devoted to the study of neutron Borromean nuclei, very intriguing exotic systems characterized by a diffuse two-neutron density distribution extending far beyond a compact core. Among them, the nucleus $^{11}$Li deserves special attention, owing to the intensive theoretical and experimental work dedicated to this system in the last decades.
The marked three-body structure of $^{11}$Li renders three-body models particularly suitable to study its ground state and continuum properties. These models have also been very useful for the interpretation of reactions involving $^{11}$Li. One of these models has been recently proposed and successfully applied to the analysis of one-neutron transfer [J.~Casal {\it et al.}, PLB767 (2017) 307] and quasi-free $(p,pn)$ reactions [M.~Gomez-Ramos {\it et al.}, PLB 772 (2017) 115]. A key issue of this model is the inclusion of the $^{9}$Li spin, which leads to a splitting of the $J^\pi=1^+,2^+$ resonances and $J^\pi=1^-,2^-$ virtual states.
In this contribution, we employ this model to reanalyze the two-neutron transfer data for $^{11}$Li(p,t)$^{9}$Li at 3 MeV/u [I. Tanihata {\it et al.}, PRL 100, 192502 (2008)]. We use the second order DWBA method, and include both sequential and simultaneous contributions. For the former, the required $\langle ^{11}\rm{Li} | ^{10}\rm{Li} \rangle$ overlaps are consistently evaluated from the three-body wave function of $^{11}$Li. Our results will be compared with those obtained with previous analyses ignoring the spin of $^{9}$Li.
| Topic | Theory |
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