Quantum Monte Carlo calculations of excited states in A = 6--8 nuclei
Steven C. Pieper, R. B. Wiringa, J. Carlson
Abstract
A variational Monte Carlo method is used to generate sets of orthogonal trial functions, PsiT(Jpi,T), for given quantum numbers in various light p-shell nuclei. These PsiT are then used as input to Green's function Monte Carlo calculations of first, second, and higher excited (Jpi,T) states. Realistic two- and three-nucleon interactions are used. We find that if the physical excited state is reasonably narrow, the GFMC energy converges to a stable result. With the combined Argonne v18 two-nucleon and Illinois-2 three-nucleon interactions, the results for many second and higher states in A = 6--8 nuclei are close to the experimental values.
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