Emission of charged particles from excited compound nuclei

Abstract

The formation of excited compound nucleus (CN) and its statistical decay is investigated within the dinuclear system (DNS) model.The initial DNS is formed in the entrance channel when the projectile is captured by a target, and then the evolution of DNS in mass asymmetry coordinate leads to formation of the hot CN. The emission barriers for complex fragments were calculated within the DNS model by using the double folding procedure for the interaction potential. It is shown that cross sections for complex fragment emission become larger when excited CN is more neutron deficient. This approach gives also an opportunity to calculate the new neutron deficient isotopes production cross sections and can be applied to describe the hot fission of heavy systems.The model was tested by comparison of calculated results with experimental datas for the 3

Effect of surface energy constant and surface asymmetry constant in the charged particle emission cross-section for the reactions $$ ^{78,82,86} Kr +^{12} C $$ 78 , 82 , 86 K r + 12 C

“…This parameter is calculated in the sticking limit as = R; A; b 1 ; b 2 ð Þ¼k 0 = 1 þ = 2 þ lR 2 ð Þ , where = 1 and = 2 are the moments of inertia of the DNS nuclei and can be calculated within the rigid-body approximation. We choose, following [24], k 0 = 0.85. The potential energy of the DNS has a minimum at touching distance between the nuclei, R = R m , for pole-pole orientation where the DNS is placed in this minimum [24].…”

“…We choose, following [24], k 0 = 0.85. The potential energy of the DNS has a minimum at touching distance between the nuclei, R = R m , for pole-pole orientation where the DNS is placed in this minimum [24]. For calculating the nuclear part of the DNS potential energy, we have used the proximity potentials Prox77, BW91 and AW95.…”

“…W Z,A (E CN *, J), is the probability of emission of a given cluster with characteristics Z and A. This quantity is obtained from the stationary solution of the master equation with respect to charge and mass asymmetries [37,38] and is given by [24]:…”

“…The nuclear part of the DNS potential by using double folding formalism has the following form [24]:…”

“…Different theoretical models try to explain and reproduce the experimental data of these fields. One of the important and powerful of these models is called dinuclear system (DNS) model [20][21][22][23][24][25][26][27] which considers, beside the complete fusion, the quasi-fission process. To use the DNS model, the potential energy of the DNS configuration must be determined.…”