Microscopic origins of effective charges in the shell model

Details Microscopic origins of effective charges in the shell model Microscopic origins of effective charges in the shell model

1996-12-05

arxiv.org/abs/nucl-th/9612015v1

Phys.Rev.C55:573-576,1997

Physics

Nuclear Physics

Nuclear Theory

10 pages. REVTEX

Scientific paper

10.1103/PhysRevC.55.573

We use a large-scale 6 hbar Omega calculation for Li6 with microscopically derived two-body interaction to construct the 0 hbar Omega 0p-shell effective hamiltonian, electric quadrupole, and magnetic dipole operators. While the E2 and M1 6 hbar Omega operators are one-body operators with free nucleon charges, the effective operators are two-body operators with substantially different renormalization for the isoscalar and isovector matrix elements, especially for the E2 operator. We show that these operators can be very well approximated by one-body operators provided that effective proton and neutron charges are used. The obtained effective charges are compatible with those used in phenomenological shell-model studies. The two-body part of the effective operators is estimated.

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