Abstract
We present angular distributions of the He6+Ni58 scattering measured at three bombarding energies above the Coulomb barrier: Elab=12.2 MeV,16.5 MeV,and 21.7 MeV. The angular distributions have been analysed in terms of three- and four-body Continuum-Discretized Coupled-Channels calculations considering the effect of the 6He breakup. A behaviour in the cross section at large angles has been observed which was reproduced only by the four-body Continuum-Discretized Coupled-Channels calculation.
Highlights
Low-energy reactions induced by light exotic nuclei have been investigated over the last years using secondary beams of 6He, 11Be, and 11Li [1,2,3,4,5,6,7]
The 6He + 58Ni angular distributions have been obtained in the θlab = 15◦–75◦ angular range with steps of 3◦ in the laboratory system
The ratio of the integrators integrator measurements (IAu)/INi on the other hand could be an additional source of errors due to possible variations in the production rate between Gold and Ni target runs
Summary
Low-energy reactions induced by light exotic nuclei have been investigated over the last years using secondary beams of 6He, 11Be, and 11Li [1,2,3,4,5,6,7]. The fact that some exotic nuclei present a neutron halo has consequences from the reaction mechanism and the nuclear structure points of view Due to their low binding energies, 0.973 MeV for 6He, 0.5 MeV for 11Be, and 0.37 MeV for 11Li, these projectiles are likely to breakup in the collision with a target. Coulomb breakup dominates at large distances, where the nuclear short-range interaction is negligible and the high angular-momentum partial waves participate, removing flux at corresponding forward angles. Nuclear breakup is a diffractive process which takes place in a localized space region around the surface of the colliding nuclei where the short-range nuclear interaction is dominant As a consequence, it tends to affect more the large angles region as it was seen in the 6He + 9Be scattering [3], where the breakup effects appear mainly at large angles. We present new data for 6He on an intermediate mass target, 58Ni
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