Al(n,xγ)Reactions for5.3<~En<~

Abstract

Interactions of neutrons with aluminum have been studied by measuring y-ray-production cross sections. Spectra were obtained for incident mean neutron energies E"=5. 35, 5.85, 6.4, 6.9, 7.45, 7.95, 8.5, and 9.0 MeV. The y rays were detected using a coaxial Ge(Li) detector of 30-cm3 active volume. Data were obtained for p-ray scattering angles of 55' for all E", 90' for all E"except 5.35 MeV, and 75' for E"=6. 4 and 7.45 MeV. Time of flight was used with the detector to discriminate against pulses due to neutrons and background radiation. Absolute cross sections for production of y rays were obtained for the incident neutron energies quoted above. The cross sections have been compared, where possible, with previous measurements with good aggrement. The spectra were studied for y rays which could be associated with deexcitation of nuclear levels having unknown decay modes. y rays were found having energies appropriate for ground-state decay of levels at excitation energies E"=5. 155, 5.414, 5.434, 6.514, 6.821, 6.956, 7.920, 7.411, 7.471, 7.56 (doublet), 7.655, 8.148, and 8.184 MeV.