9 research outputs found
Construction of Consistent Meson Exchange Currents by Laplace Transform
We propose a new method for the construction of a consistent meson exchange
current in -space for the spin-isospin dependent central and tensor part of
phenomenological nucleon-nucleon potentials by using a Laplace transformation,
which allows the representation by a finite number of Yukawa functions. This
method is applied to the Paris and the recent Argonne potentials.
Results are presented for electrodisintegration of the deuteron near threshold.Comment: 13 pages Revtex including 9 figures, final version accepted for
publication in EPJA (one figure and discussion added
The two-nucleon system in the region including full meson retardation
A model is developed for the hadronic and electromagnetic interaction in the
two-nucleon system above pion threshold in the framework of meson, nucleon and
degrees of freedom. It is based on time-ordered perturbation theory
and includes full meson retardation in potentials and exchange currents as well
as loop contributions to the nucleonic one-body current. Results for
scattering and deuteron photodisintegration are presented.Comment: 4 pages Revtex including 2 figures, contribution to "Mesons and Light
Nuclei 2001", Prague, July 2-6, 200
Polarization observables in elastic electron deuteron scattering including parity and time reversal violating contributions
The general formalism for polarization observables in elastic electron
deuteron scattering is extended to incorporate parity and time reversal
violating contributions. Parity violating effects arise from the interference
of and exchange as well as from the hadronic sector via a small
parity violating component in the deuteron. In addition we have allowed for
time reversal invariance violating contributions in the hadronic sector. Formal
expressions for the additional structure functions are derived, and their
decomposition into the various multipole contributions are given explicitly.Comment: 34 pages Revte
Complete Sets of Polarization Observables in Electromagnetic Deuteron Break-up
For deuteron photo- and electrodisintegration the selection of complete sets
of polarization observables is discussed in detail by applying a recently
developed new criterion for the check of completeness of a chosen set of
observables. The question of ambiguities and their resolution by considering
additional observables is discussed for a numerical example, for which the role
of experimental uncertainties is also investigated. Furthermore, by inversion
of the expressions of the observables as hermitean forms in the -matrix
elements a bilinear term of the form can be given as a complex
linear form in the observables from which an explicit solution for in
terms of observables can be obtained. These can also be used to select sets of
observables for the explicit representation of the -matrix.Comment: 37 pages revte
General Multipole Expansion of Polarization Observables in Deuteron Electrodisintegration
Formal expressions are derived for the multipole expansion of the structure
functions of a general polarization observable of exclusive
electrodisintegration of the deuteron using a longitudinally polarized beam
and/or an oriented target. This allows one to exhibit explicitly the angular
dependence of the structure functions by expanding them in terms of the small
rotation matrices , whose coefficients are given in terms of
the electromagnetic multipole matrix elements. Furthermore, explicit
expressions for the coefficients of the angular distributions of the
differential cross section including multipoles up to are listed in
tabular form.Comment: 23 pages revtex including one figure, accepted for Eur.Phys. J.