Clustering effect of 19B in its fragmentation

We investigate how clustering structure of the neutron dripline nucleus, 19B, is reflected in the heavy-ion reaction. We compare 19B fragmentation with 13B fragmentation in 14N-target reactions calculated by antisymmetrized molecular dynamics (AMD) [1] where 13B which is the neutron closed shell nucleus has no clustering feature in its structure, while 19B which is the neutron drip-line nucleus has a well developed cluster structure in its ground state. The clustering structure of the 19B nucleus is predicted by the molecular orbital model [2] and the AMD model [3], but has not yet been confirmed experimentally. (author)