Abstract
Recently, the energy spectrum of \boldsymbol{^{10}}10Li was measured upto \boldsymbol{4.6}4.6 MeV, via one-neutron transfer reaction \boldsymbol{d(^{9}\textrm{Li},~p)^{10}\textrm{Li}}𝐝(9Li,𝐩)10Li. Considering the ambiguities on the \boldsymbol{^{10}}10Li continuum spectrum with reference to new data, we report the configuration mixing in the ground state of the two-neutron halo nucleus \boldsymbol{^{11}}11Li for two different choices of the \boldsymbol{^{9}{\textrm{Li}}+n}9Li+𝐧 potential. For the present study, we employ a three-body (\boldsymbol{\textrm{core}+n+n}core+𝐧+𝐧) structure model developed for describing the two-neutron halo system by explicit coupling of unbound continuum states of the subsystem (\boldsymbol{\textrm{core}+n}core+𝐧), and discuss the two-neutron correlations in the ground state of \boldsymbol{^{11}}11Li.
Highlights
The light dripline nuclei lying away from the strip of stability, have gained prodigious attention of the nuclear physics community over the past few decades and a significant progress has been made both on experimental and theoretical sides to understand their exotic nature [1]
We found that for Set A for which V00 is deeper shows dominance of (s1/2)2 configuration in the ground state leading to formation of s-neutron halo
In the present study we report the emergence of bound 2n-halo ground state of 11Li from the coupling of four unbound spd-waves in the continuum of 10Li due to the presence of pairing interaction
Summary
The light dripline nuclei lying away from the strip of stability, have gained prodigious attention of the nuclear physics community over the past few decades and a significant progress has been made both on experimental and theoretical sides to understand their exotic nature [1]. Two-neutron (2n) halo systems, consisting of a core and two weakly bound valence neutrons, demand a three-body description with proper treatment of continuum. The stability of such three-body (core+n+n) system is linked to the continuum spectrum of the two-body (core+n) subsystem. The 10Li structure was studied by various techniques such as fragmentation [4], 11Li(p, d)10Li transfer reaction at TRIUMF [5], multi-neutron transfer [6] and pion absorption reactions [7] Maximum of these studies report the low-lying p1/2 neutron resonance with peak lying in the range of 500-700 keV. Few of these studies reported the presence of s-wave virtual state close to the threshold with a scattering length in the range from −20 to −30 fm [4] and not much information is available on neutron d-wave
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