Effects ofα-cluster potentials for theO16+O

Abstract

A joint analysis of the elastic-scattering angular distributions and fusion cross sections together with the S factor for the 16 O + 16 O system near and below the Coulomb barrier is reported. To describe these observables within the framework of the optical model, a comparative study of microscopic α-α double-folding clusters and phenomenological shallow potentials with surface-transparent imaginary parts is performed. Although the phenomenological Woods-Saxon type of shallow real potentials is unable to provide a consistent explanation of these data, the α-α double-folding cluster potential obtained by considering the α-cluster structure of 16 O provides a considerable improvement. The α-α double-folding cluster potential also reproduces the normalized resonant energy states of 32 S for the N = 24 cluster band.

Cluster formations in deformed states forSi28andS32Ichikawa1, Kanada-En’yo2, Möller3 2011Phys. Rev. C299730View full textAdd to dashboardCite

“…An important feature of nuclear structure in the s-d shell region is that the densities of stronglydeformed one-body states often exhibit significant cluster structure [11,12], similar to the 16 O+ 16 O configuration suggested to exist in 32 S [7,13,14]. Recently, the existence of alpha-cluster states in 32 S was clearly shown in elastic 28 Si+α scattering experiments [10]. However, the existence of the strongly deformed states and the mechanism of the cluster formations in 28 Si and 32 S have not yet been well established.…”

“…Recently, the existence of alpha-cluster states in 32 S was clearly shown in elastic 28 Si+α scattering experiments [10]. However, the existence of the strongly deformed states and the mechanism of the cluster formations in 28 Si and 32 S have not yet been well established.…”

“…In this connection, the existence of such states in 28 Si and 32 S has been theoretically suggested [5][6][7][8]. Many experimental searches for, and studies of such states have been performed [9,10].…”

“…We study cluster formation in strongly deformed states for 28 Si and 32 S using a macroscopic-microscopic model. The study is based on calculated total-energy surfaces, which are the sums of deformation-dependent macroscopic-microscopic potential-energy surfaces and rotational-energy contributions.…”

“…The study is based on calculated total-energy surfaces, which are the sums of deformation-dependent macroscopic-microscopic potential-energy surfaces and rotational-energy contributions. We analyze the angular-momentum-dependent total-energy surfaces and identify the normal-and super-deformed states in 28 Si and 32 S, respectively. We show that at sufficiently high angular momenta strongly deformed minima appear.…”