Speaker
Description
The search for Alpha-Cluster Condensate State (ACS) in always more heavy nuclei is one of the most intriguing puzzles of nuclear structure. In particular, in2021, Adachi et al. observed three states in $^{20}$Ne at 21.2, 21.8, and 23.6 MeV [1]. Such states have been suggested to be realistic candidates, being their decay well correlated with the underlying ACSs in lighter nuclei [2].In this contribution, we attempt to shed light on this topic, populating the excitation energy window of interest via alpha-transfer $^{16}$O($^{6}$Li, d)$^{20}$Ne* at 13.5 MeV/nucleon in inverse kinematics.
This exclusive measurement has been performed in summer 2024 and it consists in the detection of the target recoil deuteron with two OSCAR modules [3] placed backward in the laboratory frame, while the $^{20}$Ne decay products were collected thanks to the GARFIELD+RCo apparatus[4]. The large coverage of our apparatus and its identification capability permits to disentangle the different reaction channels involving the weakly bound Li-ions [5]. To confirm the ACS candidate states of $^{20}$Ne, we will report on events selected by the presence of the transfer deuteron in coincidence with four (out of five)alpha particles from the excited $^{20}$Ne detected, to fully reconstruct the kinematics of its decays for different excitation energy gates.
Preliminary results of this experimental search will presented.
[1] S. Adachi et al., Physics Letters B819, 136411 (2021)
[2] B. Zhou et al, Nat Commun14, 8206 (2023)
[3] D. Dell'Aquila et al., Nucl.Instr. and Methods A 877, 227 (2018)
[4] M. Bruno et al., Eur.Phys. J. A 49, 128 (2013)
[5] M.L. Wang et al, Nucl. Phys. A 1049 (2024) 122914
