The fusion of¹⁶O with an aligned¹⁶⁵Ho target

Abstract

Coupled channels calculations of the fusion cross sections for 16O with an aligned 165Ho target are presented. Predictions are made for the orientation dependence that would be observed in an experiment and these are compared with previous predictions. We predict that in an experiment aligning the target will change an unpolarized cross section of order 10 mb by between 40% and 175%, depending on the experimental conditions. The coupled channels results are compared with the results of eigenchannel and semiclassical methods 165Ho(16O,X).

Intermediate-energy four-body breakup calculations forC22

“…22 C), described by three-body model wave functions, incident upon a nuclear target. We use and generalise the adiabatic four-body approach as has been discussed previously by Christley et al [6], applied there to study 11 Li elastic scattering, and also the eikonal model, as was discussed previously for elastic scattering in Ref. [21] and for reaction cross sections in Refs.…”

“…A detailed formulation of the adiabatic four-body model, as applied to the elastic scattering of a threebody projectile, was presented by Christley et al [6]. In this work, as there, the three projectile constituents (the neutrons and 20 C core) are assumed to interact with the target nucleus through complex, spin-independent optical potentials, with the result that the total spin of the two neutrons, [s 1 s 2 ]S, is a constant of the motion.…”

“…In this paper we exploit the coupled-channels adiabatic approach of Christley et al [6] for (four-body) model calculations of reaction cross sections, σ R . We compare these calculations with the adiabatic plus eikonal fourbody dynamical approach [1,2] that makes additional approximations.…”

“…(ii) To quantify the differences between the σ R calculations that use and do not use the additional eikonal approximation(s) to the adiabatic model. To do this we explore the 22 C nucleus ground-state wave function within a core plus twovalence neutron ( 20 C+n+n) three-body framework [9] and the reaction dynamics using the four-body adiabatic model, see [6]. The converged results of this approach are compared with calculations that use the same 22 C wave functions and optical model interactions but which make the additional eikonal approximation to the reaction dynamics of the four-body problem: as have been used previously [1,2].…”

An overview of the scientific contribution of Andrea Vitturi to nuclear physics

“…In heavy-ion fusion reactions at energies around the Coulomb barrier, it has been well recognized that inelastic excitations to low-lying collective states as well as several transfer processes lead to a large enhancement of fusion cross sections relative to the prediction of a simple potential model [150,151,152,153,154,155]. A natural question Fig.…”