Contact representation of short-range correlation in light nuclei studied by the high-momentum antisymmetrized molecular dynamics

摘要

The high-momentum antisymmetrized molecular dynamics (HMAMD) is a promising framework with significant analytical simplicity and efficiency inherited from its antisymmetrized molecular dynamics describing the high-momentum correlations in various nuclear states. With the aim of further improving the numerical efficiency for the description of nucleon-nucleon correlation, we introduce a formulation by including a Gaussian weighted basis of high-momentum pairs in the HMAMD wave function, with which very rapid convergence is obtained in numerical calculation. It is surprising that the very high-momentum components in the HMAMD basis are found to be almost equivalent to the contact representation of the nucleon-nucleon pairs with very small nucleon-nucleon distance. The explicit formulation for the contact term significantly improves the numerical efficiency of the HMAMD method, which shows the importance of the contact correlation in the formulation of light nuclei.