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Tuesday, November 27

Spin Phenomena in Elastic Scattering of 6He and 8He off Protons

Charlotte Elster, Ohio University, Athens, Ohio
Physics Division Seminar
10:00 AM — 11:00 AM, Building 6008, Large Conference Room
Contact: Alfredo Galindo-Uribarri (uribarri@ornl.gov), 865.574.6124

Abstract

The calculation and derivation of microscopic optical potentials for calculating scattering observables for elastic scattering from spin-zero nuclei has a long tradition. So called microscopic ‘full-folding' models based on a nuclear density matrix and a fully-off-shell two-nucleon t-matrix have been developed mainly for closed shell nuclei heavier than Oxygen-16. Constructing microscopic optical potential for the Helium-6 isotope poses a two-fold challenge: First, Helium-6 is a loosely bound nucleus consisting of an alpha core and two valence neutrons. Second, Helium-6 as well as Helium-8 are not closed-shell nuclei. To address the first challenge, an optical potential based on the Watson first order multiple scattering ansatz is extended to accommodate the internal dynamics of a cluster model for the Helium-6 nucleus. Differential cross sections and analyzing powers are calculated for a set of energies, including 71MeV/nucleon and are discussed. In addressing the second challenge, the Watson optical potential has been extended to incorporate the open-shell structure of Helium-6 and Helium-8. Both those effects on the differential cross section and the polarization are discussed.