Study of the Clustering Structure of ^<19>B by the Use of Fragmentation Reaction : Nuclear Physics

概要

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The clustering structure of neutron dripline nucleus ^<19>B, which is predicted by the AMD model and the molecular orbital model, is investigated by studying the fragmentation reaction of ^<19>B. We compare ^<19>B fragmentation with ^<13>B fragmentation in ^<19>B + ^<14>N and ^<13>B + ^<14>N reactions at 35 MeV/nucleon by using antisymmetrized molecular dynamics, where ^<13>B has no clustering features in its structure. We find that the cluster structure of the ^<19>B nucleus is reflected in its fragmentation, since more He and Li isotopes are produced in the ^<19>B fragmentation in comparison with the case in ^<13>B fragmentation. Furthermore, we compare the ^<19>B fragmentation with ^<12>C fragmentation in the ^<14>N-target reaction at 35 MeV/nucleon. In the case of ^<12>C fragmentation, the existence of the clustering excited states of ^<12>C significantly affects the fragmentation process, since the production of α particles is largely due to fragmentation through these clustering excited states, while in the case of ^<19>B fragmentation, we cannot find such clustering excited states through which ^<19>B breaks up into clusters.
理論物理学刊行会の論文
1999-01-25