[Triumf-seminars] TRIUMF Theory Seminar today at 13:00

TRIUMF Seminars triumf-seminars at lists.triumf.ca
Tue Aug 4 05:00:01 PDT 2015


Date/Time: Tue 2015-08-04 at 13:00

Location:  Auditorium          

Speaker:   Charlotte Elster (Ohio University)

Title:     Towards ab-initio optical potentials for elastic scattering of He6 off protons

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 potentials for the Helium-6  isotope poses a two-fold challenge:
First, Helium-6 as well as Helium-8 are not  closed-shell nuclei. 
Second, Helium-6 is a loosely bound nucleus consisting of an alpha-core and two valence neutrons.

To address the first 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 calculated  for a set of
energies, including 71~MeV/nucleon. For considering the second 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 and discussed.



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