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Tests of the random phase approximation for transition strengths
Ionel Stetcu, Calvin W. Johnson
We investigate the reliability of transition strengths computed in the random-phase approximation (RPA), comparing with exact results from diagonalization in full shell-m…
Scalar ground-state observables in the random phase approximation
Calvin W. Johnson, Ionel Stetcu
We calculate the ground-state expectation value of scalar observables in the matrix formulation of the random phase approximation (RPA). Our expression, derived using the quasiboso…
SU(3) versus deformed Hartree-Fock
Calvin W. Johnson, Ionel Stetcu, J. P. Draayer
Deformation is fundamental to understanding nuclear structure. We compare two ways to efficiently realize deformation for many-fermion wavefunctions, the leading SU(3) irrep and th…
RPA vs. exact shell-model correlation energies
Ionel Stetcu, Calvin W. Johnson
The random phase approximation (RPA) builds in correlations left out by mean-field theory. In full 0-hbar-omega shell-model spaces we calculate the Hartree-Fock + RPA binding energ…