Measurement of differential cross-sections and widths of resonances in 32S(p,p'γ) 32S reaction in the 3.0-4.0 MeV region

摘要

The paper reports the widths and differential cross-sections of resonances at 3.089,3.379 and 3.717 MeV in the 32S(p,p'Y)32S nuclear reaction. The cross-sections are computed at 0° and 90° angles (relative to the beam direction) from thick target excitation curves constructed by measuring 2230 keV y-rays, charac teristic of the reaction. The differential cross-sections of resonances are about 18,64 and 70 mb/sr respec tively at 0° angle and decrease by about half around an angle of 90°. The first resonance, the sharpest among the three, exhibits a width of about 400 eV while those at 3.379 and 3.717 MeV are in 1.0-1.5 keV range. The widths of the resonances are extracted from the respective thick target excitation curves by an interquartile separation method and also by simulating their leading edges. A study of thick target yields in the 3.0-4.0 MeV proton energy region for several sulphide forming elements shows the absence of any significant interference. These resonances, as a result, can be effectively utilised for sen sitive and high resolution depth profile measurements of sulphur in films and materials surfaces.