He4fragments from theN14+C12collision at 35 MeV/nucleon and clustering in colliding nuclei

In order to study effects of clustering of colliding nuclei in the fragmentation process, the fragmentation of the ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ ${+}^{12}$C reaction at 35 MeV/nucleon is analyzed by antisymmetrized molecular dynamics. It is found that ${}_{}{}^4{}_{}{}^{}\mathrm{He}$ fragments from ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ fragmentation are much more abundant than those from ${}_{}{}^{14}{}_{}{}^{}\mathrm{N}$ fragmentation. Characters of ${}_{}{}^4{}_{}{}^{}\mathrm{He}$ fragments from ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ fragmentation are investigated and it is found that this abundance in ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$ fragmentation results from the three-alpha breakup in a short time scale where the excited states with excitation energy 7–15 MeV play an important role. © 1996 The American Physical Society.