Elsevier

Nuclear Physics A

Volume 491, Issue 1, 2 January 1989, Pages 1-23
Nuclear Physics A

Empirical isospin-nonconserving hamiltonians for shell-model calculations

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Abstract

Hamiltonians for shell-model calculations of isospin-nonconserving (INC) processes are determined empirically by requiring that they reproduce experimentally measured isotopic mass shifts. Five separate configuration spaces were considered: the 0p; the 0p12, 0d52, and 1s12; the Is-0d; the 0d32 and 0f72; and the 0f-1p shell-model spaces. The INC hamiltonian was assumed to be comprised of the Coulomb force plus phenomenological isospin-nonconserving nucleon-nucleon interactions. The parameters of the hamiltonian are the isovector single-particle energies, the overall Coulomb strength, and the isovector and isotensor strengths of the nucleon-nucleon INC interaction; and were obtained by performing a least-squares fit to experimental b- and c-coefficients of the isobaric-mass-multiplet equation.

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  • 1

    Current address: Dipartimento di Fisica, Universitá di Milano, via Celoria 16, and INFN Sezione di Milano, 20133 Milano, Italy.

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