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

[TRIUMF Seminars]

Date/Time: Tue 2011-08-02 at 13:00

Location:  Theory Room         

Speaker:   Janina Grineviciute (Western Michigan University)

Title:     Applications of calculable R-matrix theory

Abstract: Nonrelativistic calculations using a recoil corrected continuum shell model have been performed for 14N(p,g)15O reaction using an interaction from a fit to Cohen and Kurath p-shell matrix elements and Reid soft core g-matrix elements.  The results showed that the extremely low capture rate was due to a fortuitous cancelation between contributing configurations.

The relativistic R-matrix formalism that allows one to solve coupled channels equations, in which binary break up channels satisfy the relative Dirac equation, has been developed and applied to the relativistic impulse approximation (RIA) and to phenomenological quantum hadrodynamics (QHD). RIA calculations demonstrated that the local density approximation is not appropriate for relativistic calculations and that pseudoscalar and pseudovector coupling gave similar agreement to experiment.  Scattering calculations demonstrate that coupling constants derived in QHD are inappropriate in calculations where classical fields are exchanged with one meson exchange potentials.  An aberrant behaviour of pseudovector  coupling is discussed.



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