Study of the Structure of Borromean Nucleus

In the present research, we used the Ne beam at 30.8 MeV/u to bombard the 43 mg/cm C target and measured the angular correlations between the fragments and emitted proton. In the break-up reaction of Ne, one-proton knockout would result in an unstable nucleus F, which would further decay by the proton emission. The measured angular correlation between the F momentum and the relative momentum of its decay products was compared with theoretical calculations and indicated that the valence proton in Ne has the most probability to be situated in the s1/2 orbital with a small admixture of the d5/2 orbital. The present results suggest that Ne has a halo structure.