Barrier distributions from the fusion of oxygen ions withSm144,148,154

Abstract

measured with high precision, both in the cross sections and the small energy intervals, thus allowing meaningful fusion barrier distributions to be extracted. In this representation it is clearly seen that the excitation functions are not smooth and featureless; each is unique and is shown to depend on the details of the structure of the interacting nuclei. The effects of excitation of the collective single phonon states in ' Sm are evident.For the ' 0 projectile, the role of additional coupling to neutron stripping channels with positive Q values can be seen. As expected, the barrier distributions associated with ' Srn and ' W are dominated by deformation effects. However, the data appear to display sensitivity to additional couplings, even though they involve relatively weak inelastic and transfer channels.PACS number(s): 25.70.Jj

Role of neutron transfer and deformation effect in capture process at sub-barrier energies

“…the neutron transfers can be disregarded. In figures 1 and 2, the calculated capture cross sections for the reactions 16 O, 48 Ca, 40 Ar+ 154 Sm, and 74 Ge+ 74 Ge are in a good agreement with the available experimental data [21][22][23][24] showing that the quadrupole deformations of the interacting nuclei are the main reasons for the enhancement of the capture cross section at sub-barrier energies. The quadrupole deformation parameters β 2 are taken from Ref.…”

Coupled–Channels Analyses For Heavy–Ion Fusion Reactions of ¹⁶O+⁹²Zr,^144,148Sm Systems

“…In this section we present our detailed coupled-channels analyses for heavy-ion fusion data of 16 O+ 92 Zr, 144,148 Sm systems [12,13]. The calculations are done with the computer code CCFULL [6] but using the potential given by Eq.…”

“…This clearly demonstrates the possible danger of analyzing the experimental fusion data in a form of fusion cross section alone. It is well known that the fusion barrier distribution is very sensitive to the detailed channel coupling [12]. It thus evident that the coupling to single quadrupole and octupole excitations in 144 Sm is necessary for explaining the experimental fusion data of 16 O+ 144 Sm reaction as long as we assume the harmonic limit for the nuclear vibrations.…”

“…Instead of such approaches, here we perform the coupled-channels calculations using an error function type potential for the nuclear potential. The aim of this study is to see weather this approach works to explain the fusion data of 16 O+ 92 Zr, 144,148 Sm reactions [12,13]. In particular, we study the effects of multiphonon excitations of the target nuclei on the fusion cross sections as well as the fusion barrier distributions for these systems.…”

Large-angle scattering and quasielastic barrier distributions

“…This method was first proposed by Rowley, Satchler, and Stelson in Ref. [4], and has stimulated precise measurements of fusion cross sections for many systems [5,6] (see Ref. [1] for a detailed review).…”