Pre-equilibrium particle emission in alpha induced reactions

Abstract

Study of the mechanism of pre-equilibrium particle emission in alpha particle induced reactions has been done in the present work. The cross-sections for systems α + ¹⁴⁴Sm and α + ¹⁵⁴Sm have been calculated using the statistical model code ALICE-91. Significant pre-equilibrium particle emission contribution has been obtained for these systems at higher projectile energy. At higher projectile energies, the pre-equilibrium particle emission has been found to affect predominantly over the equilibrated compound nucleus emissions. The contribution of pre-equilibrium particle emission is found larger for α + ¹⁴⁴Sm system than that of α + ¹⁵⁴Sm system. The present results indicate that the systems having spherical targets have more contribution of pre-equilibrium particle emission than that of systems with deformed targets. These results suggest that the shape of target (spherical or deformed) also affect the dynamics of pre-equilibrium particle emission at energy above the fusion barrier.