Prompt γ-ray emission in the reactions of 120 MeV 20Ne with 27A1

The emission of prompt γ-radiation in the de-excitation of the products of the reactions of 120 MeV ²⁰Ne with ²⁷Al has been studied. Three NaI detectors placed at angles of 35°, 90° and 145° to the direction of the ²⁰Ne beam were used to detect γ-rays in coincidence with reaction products having 6 ≦ Z ≦ 20, detected in a counter telescope. Data were obtained with the counter telescope in the same plane, as well as in a plane perpendicular to the plane defined by the beam and the NaI detectors. The average multiplicities 〈M_γ〉, average energies 〈E_γ〉, primary γ-ray energy spectra and the variation of 〈M_γ〉 and 〈E_γ〉 with angle of observation and kinetic energy of the detected products are presented and discussed in terms of the dominant reaction mechanisms.