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

[triumf-seminars at lists.triumf.ca]

Date/Time: Tue 2011-05-17 at 13:00

Location:  Theory Room         

Speaker:   Michael Kruse (U Arizona)

Title:     Importance truncation and the further development of the no-core shell model.

Abstract: The no-core shell model, an ab-initio approach to calculating observables of light nuclei, has been shown to be successful in describing p-shell nuclei properties. With the inclusion of the resonating group method, the approach can be extended to describe nuclear reactions. However, the calculations require a large number of basis states for full convergence. By using perturbation theory, one can formulate a procedure, for selecting only those states that one considers "important". This selection procedure is able to drastically reduce the size of the basis, yet captures enough of the physics present, comparing well with full space calculations. I will show calculations in which we calculate the wave functions of Helium-8 (in an importance truncation setting), which are used as input for the n+He-8 scattering calculations. I will also briefly show some work on the no-core shell model, using the ideas of effective field theory, particularly the ultra-violet and infra-red properties of the model.



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