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Title:Green's function Monte Carlo calculations of few nucleon systems
Author(s):Pudliner, Brian Scott
Doctoral Committee Chair(s):Pandharipande, V.R.
Department / Program:Physics
Subject(s):few nucleon systems
Monte Carlo
Green's function Monte Carlo (GFMC)
nuclear ground states
Abstract:Recently, a realistic nucleon-nucleon potential has been developed with the goal of accurately reproducing isospin symmetry breaking effects in the nuclear interaction. We briefly discuss the motivation for this potential, called Argonne v18 , as well as the Urbana models of three nucleon interactions. Our approach for modeling the ground states of nuclear systems begins with the development of a variational wave function. We discuss the basis for our variational wave functions and the Monte Carlo techniques used to evaluate expectation values with these wave functions. To determine the exact ground state, Green's function Monte Carlo (GFMC) techniques are used. We review the method of GFMC in general and then discuss its application to the problem of nuclear ground states in some detail. We study a range of nuclear ground states using GFMC. A baseline calculation is done for the 3 H and 4 He ground states to fit the parameters of the three-nucleon potential and to evaluate the 3 H e-3 H mass splitting. A spectrum of six-body states, including the lowest energy J'1l" = o+, 1 +, 2+, and 3+ states of 6 Li and o+ states of 6 He and 6 Be, is then investigated. Isospin symmetry breaking effects are probed by measuring the 6 Be-6 He isovector and H6Be+6He)-6Li isotensor mass splittings. The calculations are then extended to the 7 Li J7r = ~-, ~-, ~-, ~- states, and the isovector mass splitting 7 B e-7 Li is evaluated. To provide constraints on Skyrme-type effective interactions in neutron-rich systems, GFMC calculations for 8 n(J7r = o+) and 7n(J7r = 1/2- and 3/2-) neutron drop clusters are carried out. The spin-orbit splitting of the 7 n drops and the central density of 8n are used to offer improvements to energy-density functionals.
Issue Date:1996
Genre:Dissertation / Thesis
Rights Information:1996 Brian Scott Pudliner
Date Available in IDEALS:2011-04-19
Identifier in Online Catalog:3955832

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