Open Shell Effects in a Microscopic Optical Potential for Elastic Scattering of ${}^{6(8)}$He

Abstract

Elastic scattering observables (differential cross section and analyzing power) are calculated for the reaction ${}^6$He(p,p)${}^6$He at projectile energies starting at 71 MeV/nucleon. The optical potential needed to describe the reaction is based on a microscopic Watson first-order folding potential, which explicitly takes into account that the two neutrons outside the ${}^4$He-core occupy an open p-shell. The folding of the single-particle harmonic oscillator density matrix with the nucleon-nucleon t-matrix leads for this case to new terms not present in traditional folding optical potentials for closed shell nuclei. The effect of those new terms on the elastic scattering observables is investigated. Furthermore, the influence of an exponential tail of the p-shell wave functions on the scattering observables is studied, as well as the sensitivity of the observables to variations of matter and charge radius. Finally elastic scattering observables for the reaction ${}^8$He(p,p)${}^8$He are presented at selected projectile energies.

14 pages, 14 figures

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• Recent developments in no-core shell-model calculations
• Lithium isotopes within the ab intio no-core full configuration approach
• Matter and charge radius of 6He in the hyperspherical-harmonics approach
• Shallow and diffuse spin-orbit potential for proton elastic scattering from neutron-rich helium isotopes at 71 MeV/nucleon
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Cited by in corpus (5)

• Recent developments for the optical model of nuclei
• Ab initio Folding Potentials for Nucleon-Nucleus Scattering based on NCSM One-Body Densities
• Microscopic optical potentials derived from ab initio translationally invariant nonlocal one-body densities
• Ab initio Leading Order Effective Potentials for Elastic Nucleon-Nucleus Scattering
• Spin dependent ab initio nonlocal No-Core Shell-Model One-Body Densities