26 citations · 44 across the 3 of their papers we have counts for
7 papers
Shortcuts to nuclear structure: lessons in Hartree-Fock, RPA, and the no-core shell model
Calvin W. Johnson, Ionel Stetcu
While the no-core shell model is a state-of-the-art microscopic approach to low-energy nuclear structure, its intense computational requirements lead us to consider time-honored ap…
Electromagnetic transitions with effective operators
Ionel Stetcu, Bruce R. Barrett, Petr Navratil +1
In the no-core shell model formalism we compute effective one- and two-body operators, using the Lee-Suzuki procedure within the two-body cluster approximation. We evaluate the val…
Gamow-Teller transitions and deformation in the proton-neutron random phase approximation
Ionel Stetcu, Calvin W. Johnson
We investigate reliability of Gamow-Teller transition strengths computed in the proton-neutron random phase approximation, comparing with exact results from diagonalization in full…
Statistical spectroscopic calculation of expectation values and spin-cutoff factors
Calvin W. Johnson, Jameel-Un Nabi, W. Erich Ormand
Recently we proposed a formalism, based in nuclear statistical spectroscopy, for efficient computation of nuclear level density, or densities of states, through a sum of partitione…
Reliable calculations of level densities using statistical spectroscopy
Jameel-Un Nabi, Calvin W. Johnson, W. Erich Ormand
Nucleosynthesis calculations require nuclear level densities for hundreds or even thousands of nuclides. Ideally one would like to constrain these level densities by microscopicall…
Statistical models of nuclear level densities
Calvin W. Johnson, Jameel-Un Nabi, W. Erich Ormand
We present calculations of nuclear level densities that are based upon the detailed microphysics of the interacting shell model yet are also computationally tractable. To do this,…