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13 papers · 2 filters
Electromagnetic Form Factors and Charge Densities From Hadrons to Nuclei
Gerald A. Miller
A simple exact covariant model in which a scalar particle is modeled as a bound state of two different particles is used to elucidate relativistic aspects of electromagnetic form f…
Collapse of the random phase approximation: examples and counter-examples from the shell model
Calvin W. Johnson, Ionel Stetcu
The Hartree-Fock approximation to the many-fermion problem can break exact symmetries, and in some cases by changing a parameter in the interaction one can drive the Hartree-Fock m…
Model space truncation in shell-model fits
G. F. Bertsch, C. W. Johnson
We carry out an interacting shell-model study of binding energies and spectra in the -shell nuclei to examine the effect of truncation of the shell-model spaces. Starting with…
Nucleon-nucleon charge symmetry breaking and the dd -> alpha pi0 reaction
A. C. Fonseca, R. Machleidt, G. A. Miller
We show that using parameters consistent with the charge symmetry violating difference between the strong nn and pp scattering lengths provides significant constraints on the ampli…
The NJL-jet model for quark fragmentation functions
T. Ito, W. Bentz, I. C. Cloët +2
A description of fragmentation functions which satisfy the momentum and isospin sum rules is presented in an effective quark theory. Concentrating on the pion fragmentation functio…
Neutron Charge Density from Simple Pion Cloud Models
Jared A. Rinehimer, Gerald A. Miller
The physical nucleon is modeled as a bare nucleon surrounded by a pion cloud using a psuedoscalar pion-nucleon coupling to examine its implications for the neutron form factor, F_1…