⁶Li(p, 2p)⁵He Reaction and Alpha-Deuteron Cluster Model for⁶Li

Abstract

Four-body correlations may appear as aclustering in light nuclei. 1 ) The pion-exchange nucleon-nucleon potentials make the anucleon interaction rather weak. though inner nucleons are strongly bound in the a particle. 6 Li, which is the lightest stable nucleus with such correlations, should have an a cluster core and loosely bound nucleons. The _ latters correlate to make a deuteron cluster and are well separated from the former. In fact, the a-d cluster modeF) describes reasonably the low-lying states of 6 Li. The variational calculation 3 ) for the ground state shows that the a cluster has very small compressibility and that the binding energy between the a and d clusters in the relative S state is rather small so that 6 Li has a very diffuse surface. The Coulomb disintegration 4 ) and (n-, nn) reaction') for 6 Li are also well explained with this modeL Recently, a large amount of information 6 ) on the quasi-free P-P scattering for 6 Li is