Orateur
Description
Neutron-rich lithium nuclei are ideal systems for studying the interplay between many-body correlations and the properties of the particle continuum. For example, $^{11}$Li and $^{12}$Li have a large neutron-to-proton imbalance and a very low neutron-separation energy, and their structure is expected to be influenced by coupling to the continuum. To date, only a few models, like the Gamow Shell Model (GSM) [1], currently treat bound, resonance, and scattering states on equal footing, making experimental data essential for constraining continuum effects.
The structure study of $^{12}$Li was measured through a one-neutron transfer reaction using a $^{11}$Li beam produced at TRIUMF with an intensity of 2000 pps at 7.5 AMeV. We used the ACTAR TPC detector[2,3], which served both as the target and the detection medium, resulting in an overall enhancement in detection efficiency. The goal of the experiment is to measure the location of the first p- and d-wave resonances and to deduce the nature of the low-energy states in $^{12}$Li. The measured states will provide crucial information on the relative positions of the 0p$_{1/2}$, 0d$_{5/2}$, and 1s$_{1/2}$ orbitals at N=9. This was the first experiment to measure the particles stopped inside the active volume of the ACTAR-TPC detector.
This talk will present preliminary results of the $^{11}$Li(d,p)$^{12}$Li experiment.
[1] N. Michel et al., Physical Review Letters 89, 42502 (2002).
[2] B. Mauss et al., Nucl. Instrum. Methods Phys. Res. A 940, 498–504 (2019).
[3] T. Roger et al., Nucl. Instrum. Methods Phys. Res. A 895, 126–134 (2018).