The influence of the spectroscopic deformation of Li-isotopes on their interaction with51V

Abstract

The energy dependence of the total reaction cross section ~r r and its tensor analyzing power T~o was measured for the 7Li-51V interaction in the energy range ELi=10-20MeV using two different experimental methods. Reaction residues were observed directly by their characteristic 7-emission, and the elastic scattering of 7Li from 51V was investigated. Additionally, the elastic scattering of 6Li from 51V was measured at 9.8, 12 and 14 MeV. The tensor analyzing power data can be interpreted as being caused by the spectroscopic mass deformation of the Li-ions. The energy dependence of crr and T~o above the Coulomb barrier can be described in terms of the classical sharp-cutoff model.Nuclear Reactions: 6'7Li+ 51V; ELi= 10-20 MeV, characteristic ?,-radiation of reaction residues, elastic scattering; measured reaction cross section crr and tensor analyzing power T~0; sharp-cutoff model.

23Na+23Na fusion with unpolarized and aligned beams

“…As a consequence of the positive spectroscopic nuclear quadrupole moment of 23Na, the tensor analyzing power Tfus, z0 is positive at low energies and negative at high energies. It crosses zero at ECM ~--25 MeV, as it is expected from the shape effect model [42]. The prediction of the surface friction model disagrees with the experimental value, despite its relatively large error bar.…”

Analysis of scattering and reactions of aligned7Li-nuclei in a double folding model

“…Additionally shown is the /-dependence of the transmission coefficients T~ for unpolarized projectiles at these energies. As expected from the success of the sharp cutoff model [5,6], at E=17.5MeV Acr~ is different from zero only for/-values near the grazing angular momentum. Only positive values of Ao-~ contribute to Aa r at this energy.…”

“…The centrifugal term h z l(l+ 1)/2#R~ has been subtracted from E l to obtain a reduced reaction barrier height for comparison with the s-wave barrier parameter V(Ro) from the sharp cutoff model [5,6,12]. Though the reduced barrier height and the radius R l show a slight variation with l, the values do not deviate more than 5% from the sharp cutoff values V(Ro) =9.6+_I.0MeV and Ro=9.5+0.3MeV [5,6]. In fact, for all orbital angular momenta these barrier parameters have values within the range of uncertainty of the sharp cutoff parameters.…”

“…The excitation function of the total reaction cross section a r and its tensor analyzing power T~o for the 7Li-51V interaction at energies above the Coulomb barrier could be sufficiently described by a modified sharp cutoff model [5,6,12]. From the excitation function of the tensor analyzing power T~o of the reaction cross section the spectroscopic mass deformation length /~RI~ i of 7Li was determined besides the sharp cutoff radius and the corresponding swave barrier height which were deduced from the excitation function of the reaction cross section o -r [5,6]. In these analyses the 7Li-nucleus was approximated by a uniform rotational ellipsoid with a sharp surface.…”

“…The observables for elastic scattering of aligned 7Li from 51V and 58Ni will be derived from optical model calculations using the DF potential. These calculations are compared to experimental data for elastic and quasielastic scattering of 7Li on SSNi and 51V [2,4,5]. Furthermore, a barrier transmission model for aligned deformed projectiles will be used to calculate from the DF real interaction potential the energy dependence of the 7Li-S1V total reaction cross section ~r and the corresponding tensor analyzing power T~o.…”