Orateur
Description
Understanding how cluster structures emerge within neutron-rich nuclei has become of great relevance in nuclear structure physics and it has been subject of different approaches of study. The present work aims to investigate this phenomenon in the ground state of light neutron-rich nuclei beyond alpha-clustering in the beryllium isotope chain via $^{10}$Be(p,$\alpha$)@38MeV/u and $^{10}$Be(d,$^{6}$Li)@ 17MeV/u pick-up reactions. This study is motivated by theoretical predictions of infinite nuclear matter \cite{Typel2013}, suggesting that light cluster formation, such as deuterons, tritons, and helium, tend to form at low nuclear densities \cite{Zhang2017}. Moreover, preliminary experimental results from knock-out reactions obtained in RIBF facilities suggest triton formation on the surface of the $^{14}$Be halo nucleus. Thus, this experiment offers an opportunity to complement the information through the Be isotope chain while comparing both methods.
The experiment was conducted at GANIL using fragmentation beams produced by the LISE spectrometer and the detection system of the MUGAST@LISE 2024 campaign \cite{GirardAlcindor2024}. It consists of the MUGAST array \cite{Pollacco2005} coupled with the EXOGAM gamma-ray spectrometer \cite{Simpson2000} and a zero degree detection system (ZDD). An event-by-event reconstruction of the fragmented beams was performed using a set of two CATS beam trackers \cite{Ottini1999} located upstream of the 5 mg/cm$^2$ CH$_2$ and CD$_2$ reaction targets.
In this contribution preliminary results of the data analysis for the three mentioned reactions will be presented. The detection and identification of heavy and light fragments ($^{6,7}$Li and $^{4,6}$He) in coincidence using the MUGAST array allowed a full kinematic reconstruction for each reaction. Using this information, the invariant mass method is applied to extract the excitation energies corresponding to the ground states of the beryllium isotopes, enabling the identification of the reaction channels of interest and the determination of the measured differential cross sections. These cross-sections will be compared to theoretical DWBA calculations by use of microscopic cluster wave functions as structure inputs. This comparison allows to probe the description of cluster structure of the $^{10}$Be ground states within these microscopic models.