Study of the very neutron-rich ¹⁰He by one-proton transfer reaction ¹¹Li(d,³He)

Physics at the drip-line offer the opportunity to study nuclei at the limits of the nuclear landscape, where additional protons or neutrons can no longer be kept in the nucleus. In the vicinity of the drip-lines, the structural features of the nuclei change with respect to the more stable nuclei, the normal shell closure of particles disappear and new phenomena appear, such as clusterization and halo. In this work we have revisited the spectroscopy of the unbound ¹⁰He by means of the ¹¹Li(d,³He) reaction at 50 A*MeV studied in missing mass method with the MUST2 array at the RIPS beam line of RIKEN. The experimental part of this study rely on new detection set-up using very thin silicon detectors. For the first time, the effective operability of these detectors, in conjunction with high granularity position sensitive detectors, was proved. The transfer reaction approach led to clear results on the ¹⁰He first resonant state position, found in this work at 1.4(3) MeV, in agreement with most of the previous experimental works. The extraction of a spectroscopic factor for the first time shed light on the <¹⁰He|¹¹Li> overlap, found to be 0.13(6). (author)