Oak Ridge National Laboratory

Physics Division

Physics Division Seminars

Physics Division Seminars bring us speakers on a variety of physics related subjects. Usually these are held in the Building 6008 large Conference Room, at 3:00 pm on the chosen day, but times and locations may vary. For more information, contact our seminar chairman,

Alfredo Galindo-Uribarri
Tel (Office): (865) 574-6124  (FAX): (865) 574-1268

Tue., November 27, 2012, at 10:00 a.m. (refreshments at 9:45 a.m.)

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

Charlotte Elster, Ohio University, Athens
Building 6008 Large Conference Room

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.

Alfredo Galindo-Uribarri 574-6124