Clustering Structure of 10Be Studied with the Deformed RMF+BCS Method

We investigate the nucleus ¹⁰Be using the deformed relativistic mean field (RMF) model and BCS theory. The calculated density distribution suggests two α clusters in the nucleus ¹⁰Be. According to BCS theory, the two valence neutrons transit to the first excited state 0₂⁺ in a pair and form a 2-n cluster. By comparing the two neutron separation energy (S_2n) with the single neutron separation energy (S_n), and analyzing the difference between the neutron and proton rms radii (Rn-Rp) calculated by the deformed RMF, we suggest that ¹⁰Be is the best candidate for a two-neutron skin. The two-neutron skin clings to the 2α clusters closely and makes the two α clusters have cross and chain distribution.