Parametrization of theH2(γ,p)nreaction between 185 and 420 MeV

Abstract

A simple parametrization of the $^{2}\mathrm{H}$$(\ensuremath{\gamma},p)n$ cross-section data from LEGS, Mainz, and Bonn at laboratory photon energies between 187.5 and 420 MeV and the LEGS and Mainz beam asymmetry data between 185 and 412 MeV has been done. The fit represents both the energy and angular dependence of the cross section and asymmetry in terms of Legendre polynomials. A reduced ${\ensuremath{\chi}}^{2}$ of 1.641 is obtained for the cross-section data with a total of 20 parameters. Three of the parameters are renormalization factors introduced to permit the three cross-section data sets to float relative to one another. The resulting renormalization factors are found to be well within the quoted systematic uncertainties for each experiment. The energy dependence of the parameters is in good agreement with fits done to the Mainz data at individual energies. The asymmetries are fit with an additional eight parameters with a reduced ${\ensuremath{\chi}}^{2}$ of 1.229.