Energie- und Winkelverteilung sekundärer Photonen bei der Wechselwirkung eines 6,2 GeV-Gammastrahls mit komplexen Kernen

The energy spectra of secondary photons from the interaction of a 6.2 GeV bremsstrahlung beam with targets of H₂, Be, C, Al and Cu are measured for laboratory angles from 35° to 120°. All spectra exhibit an exponential decrease of the photon yield with increasing momentum. Difference measurements with energies of the bremsstrahlung beam from 3.5 to 6.2 GeV for a center of mass angle of 90° are compared with the thermodynamical model of Fermi and the reaction temperature is determined to be 83MeV±8%. The results agree approximately with the measurements of p-Be-collisions at small laboratory angles.