Decay of241Pu*formed in9Be + 

Abstract

The decay of the hot and rotating compound nucleus 241 Pu * formed in the reaction 9 Be + 232 Th around the Coulomb barrier (≈42.16 MeV), at energies ranging from 37 to 48 MeV, is studied using the dynamical cluster-decay model (DCM) with the effects of static and dynamic deformations included. With the inclusion of dynamical deformations both the preformation probability P 0 and the tunneling probability P , and hence the cross sections, change considerably. The only parameter of the model, namely, the neck-length parameter, varies smoothly with excitation energy or temperature of the system both at above-and below-barrier energies, whose value depends strongly on the limiting angular momentum, which in turn depends on the sticking and nonsticking moments of inertia. The relative effect of static and dynamic deformations on the neck-length parameter R is also studied which indicates the reaction time scale for both static and dynamic choices of deformation. In addition, the exclusive role of angular momentum and "barrier modification" effects at sub-barrier energies are also addressed. Although calculated anisotropies are consistent with the results of Appannababu et al. [Phys. Rev. C 83, 067601 (2011)], no significant contribution of a noncompound nucleus in the form of incomplete fusion is seen on the basis of DCM calculations.

Role of rotational energy component in the dynamics of 16O+198Pt reaction

“…The sticking limit (I S ) is more appropriate [6] for the use of proximity potential with neck-length surface ≤2 fm, which has the consequences that, the limiting angular momentum is much larger in this case as compared to I NS limit where lesser number partial waves contribute towards cross-sections. The previous studies [7,8,10,11] suggests that, both I S and I NS limits are equally good to study evaporation residue process, although, in fission process I S seems to perform better [6,11]. These observations are for independent addressal of ER and fission paths governed in independent reactions induced via heavy ion collisions.…”

Entrance channel effects in the decay of [sup 190]Pt

“…In dynamical cluster-decay model (DCM) [1,2,6,7,8], the compound nucleus (CN) decay cross-section is de¿ned in terms of partial wave analysis as…”

“…132 Sn+ 58 Ni and 126 Sn+ 64 Ni [5] with the use of radioactive beams. This offers an opportunity to study the entrance channel effect of 190 Pt * nucleus by using the dynamical cluster-decay model (DCM) [1,2,6,7,8].…”

Theoretical study of odd-mass Fr isotopes using the collective clusterization approach of the dynamical cluster-decay model

“…In this paper, we extend our earlier works [21,22] of odd-mass 213,215,217 Fr * isotopes to a complete study of decay cross sections (both ER and ff) and fission fragment anisotropies for the reactions 18 O + 197 Au → 215 Fr * and 19 F + 194,198 Pt → 213,217 Fr * at the full range of E c.m. = 48-106 MeV, based on the three experiments of Refs.…”

“…It is generally believed that decay of CN is independent of its mode of formation, except for the requirement of various conservation laws, and it can decay in a number of ways depending on the incident energy of the projectile and the deformations and shape orientations of both projectile and target nuclei. In general, the decay of CN goes through processes like the evaporation residue (ER), intermediate mass fragments (IMF), and fusion-fission (ff), described by various theoretical models, like the statistical evaporation [1][2][3][4][5] and fission model [6,7], the thermodynamical Dubna model of heated CN [8][9][10], and the dynamical cluster-decay model of Gupta and collaborators [11][12][13][14][15][16][17][18][19][20][21][22] used here. The ER consists of the light particles (LPs), neutrons, protons, α particles, and γ rays (A 4), whereas IMFs are nuclei with masses 5 A 20 and 2 Z 10 and ff comprises the near-symmetric and symmetric fission fragments, nSF and SF.…”