Delta--Excitation and Exchange Corrections for NN--Bremsstrahlung

Details Delta--Excitation and Exchange Corrections for NN--Bremsstrahlung Delta--Excitation and Exchange Corrections for NN--Bremsstrahlung

1994-10-21

arxiv.org/abs/nucl-th/9410040v1

Phys.Rev.C51:1666-1675,1995

Physics

Nuclear Physics

Nuclear Theory

15 pages in LaTex, using Revtex, 6 figures as uufile'd, compressed Postscript file included, TRIUMF preprint TRI-PP-94-90

Scientific paper

10.1103/PhysRevC.51.1666

The role of the relativistic amplitudes for a number of ${\cal O}(k)$ processes usually neglected in potential model calculations of NN--bremsstrahlung is investigated. In particular, we consider the $\Delta$--excitation pole contributions related to the one--pion and one--rho exchange and in addition include the exchange contributions induced by the radiative $\omega,\,\rho \to \pi \gamma$ decays. The contributions are calculated from relativistic Born amplitudes fitted to $\Delta$--production and absorption data in the energy range up to 1 GeV and then used to supplement potential model and soft photon calculations for nucleon--nucleon bremsstrahlung. The effects on $NN\gamma$--observables, although moderate in general, are found to be important in some kinematic domains.

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