Impact of off-diagonal cross-shell interaction on ¹⁴ C

Abstract

The shell-model investigation is performed to show the impact on the structure of 14 C contributed by the off-diagonal cross-shell interaction, pp |V| sdsd , which represents the mixing between the 0 and 2 ω configurations in the psd model space. Observed levels of the positive states in 14 C can be nicely described in 0−4 ω or a larger model space through the well defined Hamiltonians, YSOX and WBP, with a reduction on the strength of the pp |V| sdsd interaction in the latter. The observed B(GT) values for 14 C can be generally described by YSOX, while WBP and their modifications on the pp |V| sdsd interaction fail for some values. Further investigation shows the effect of such interaction on the configuration mixing and occupancy. The present work shows examples on how the off-diagonal cross-shell interaction strongly drives the nuclear structure.

Spin alignment following inelastic scattering of Ne17 , lifetime of F16 , and its constraint on the continuum coupling strength

“…The experimental ordering of levels in 16 N is obtained if the strongly attractive T = 0 matrix elements: 0p 1/2 1s 1/2 ; J π = 0 − |V |0p 1/2 1s 1/2 ; J π = 0 − and 0p 1/2 0d 5/2 ; J π = 2 − |V |0p 1/2 0d 5/2 ; J π = 2 − become less attractive by 500 keV and 300 keV, respectively, as compared to their original values in WBP−. This change of the two matrix elements implies a small modification of WBP− monopole terms M T =0 (0p 1/2 1s 1/2 ) and M T =0 (0p 1/2 0d 5/2 ) which become -2.985 MeV and -3.863 MeV, respectively, as compared to -3.11 MeV and -3.988 MeV in the original WBP− interaction [29]. In 16 F, in addition to this change of the T = 0 two-body matrix elements, one has to correct the splitting between 0p 1/2 and 1s 1/2 single-particle levels.…”

“…The Hamiltonian of the SMEC consists of the monopole-based SM interaction (referred to as WBP− [29]) in the full psd model space plus the Wigner-Bartlett contact interaction,…”

Convenient Location of a Near-Threshold Proton-Emitting Resonance in B11

“…In our study of the resonance at 11.425 MeV, the Hamiltonian H Q0Q0 contains the WBP− interaction [20] in the full psd model space. The continuum-coupling interaction was assumed to be the Wigner-Bartlett contact force…”

Neutronic study of UO2-BeO fuel with various claddings

“…The ENDF/B-VII.0 nuclear data library [20] is used in the present study. In nuclear physics, the properties of nuclei, such as masses and half-lives, can be described through many-body Schrodinger Equation [27], [28], which can be simplified through the Monte Carlo method.…”