Proton spectra with low-energy-threshold from 40- and 70-MeV proton-induced reactions

We have developed a low-energy-threshold detector consisting of a Bragg curve counter (BCC), two silicon-surface barrier detectors and a bismuth germanate scintillator to obtain experimental double-differential cross section (DDX) data on (p, p'x) reactions for incident energies of several tens of MeV. The BCC can identify charged particles by itself and can do so for protons down to 1 MeV. The developed detector is used to measure proton spectra from ^natC, ²⁷Al, ^natCu, ^natAg, ^natTa, and ¹⁹⁷Au targets at the detection angles in 60 - 150° with incident energies of 40 and 70 MeV. The minimum energy in the spectrum data is 1.3 MeV, which gives spectra in the whole energy range. Measured spectra are compared with the calculation of intranuclear cascade plus evaporation process. (author)