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 （S2n） with the single neutron separation energy （Sn）, 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.     

A relativistic continuum Hartree-Bogoliubov theory description of N=3 isotones

The ground-state properties of N=3 isotones and mirror nuclei have been investigated in the Rrelativistic Continuum Hartree-Bogoliubov theory with the NLSH effective interaction. Pairing correlations are taken into account by a density-dependent δ-force. The calculations show that the proton density distributions of ⁸B and ⁹C have a long tail, the core has an increasing tendency of ⁹C and the paired off valence protons make the halo distribution shrink. The cross sections for the ⁸B(⁹C)+¹²C reaction which are consistent with the experimental data are calculated using the Glauber model. On the whole, we think that ⁸B is a one-proton halo nucleus and ⁹C is a two-proton halo nucleus.     

Effects of Pairing Correlations on Formation of Proton Halo in 9C

Properties for the ground state of 9 C are studied in the relativistic continuum Hartree-Bogoliubov theory with the NLSH, NLLN and TM2 effective interactions. Pairing correlations are taken into account by a density-dependent δ-force with the pairing strength for protons determined by fitting either to the experimental binding energy or to the odd-even mass difference from the five-point formula. The effects of pairing correlations on the formation of proton halo in the ground state of 9C are examined. The halo structure is shown to be formed by the partially occupied valence proton levels p3/2 and p1/2.     

The neutron halo structure of 17B studied with the relativistic Hartree-Bogoliubov theory

The properties of neutron-rich boron isotopes are studied in the relativistic continuum Hartree-Bogoliubov theory in coordinate space with NL-SH, PK1 and TM2 effective interactions. Pairing corrections are taken into account by a density dependent force of zero range. The binding energies calculated for these nuclei agree with the experimental data quite well. The neutron-rich nucleus ¹⁷B has been predicted to have a two-neutron halo structure in its ground state. The halo structure of ¹⁷B is reproduced in a self-consistent way, and this halo is shown to be formed by the valence neutron level 2_s1/2.