Decay Analysis of Ge Isotopes Formed in Reactions Induced by Tightly and Loosely Bound Projectiles

Abstract

The dynamical cluster-decay model (DCM) is employed to investigate the decay of 68,70 Ge * compound nuclei formed respectively via tightly ( 4 He) and loosely ( 6 He) bound projectiles, using 64 Zn target. The study is carried out over a wide energy range (Ec.m.∼5 MeV to 16 MeV) by including the quadrupole deformations (β2i) and optimum orientations (θ opt i ) of the decaying fragments. The fusion cross-sections, obtained by adding various evaporation channels show nice agreement with the experimental data for 4 He+ 64 Zn reaction. The contribution from competing compound inelastic scattering channel is also analyzed particularly for 68 Ge * nucleus at above barrier energies. On the other hand, the decrement in the fusion cross-sections of 70 Ge * nuclear system is addressed by presuming that 65 Zn ER is formed via two different modes: (i) the αn evaporation of 70 Ge * nucleus, and (ii) 1n-evaporation of 66 Zn * nuclear system, formed via breakup and 2n-transfer channels due to halo structure of the 6 He projectile. Besides this, the suppression in 2np evaporation cross-sections suggests the contribution of another breakup and transfer process of 6 He i.e. 4 He+ 64 Zn. The contribution of breakup+transfer channels for 6 He+ 64 Zn reaction is duly addressed by applying relevant energy corrections due to the breakup of " 6 He" projectile into 2n and 4 He. In addition to this, the barrier lowering, angular momentum and energy dependence effects are also explored in view of the dynamics of chosen reactions.