Emission of high-energy alpha particles in nuclear reactions of Ca-48 and Fe-56 ions on Ta-181 and U-238 targets

The results of experiments on measuring the energy spectra of alpha particles in reactions with heavy ions are presented. The measurements were performed using the high-resolution magnetic analyzer MAVR with beams of Ca-48 (280 MeV) and Fe-56 (320 and 400 MeV) on Ta-181 and U-238 targets at an angle of 0 degrees. A strong dependence of the double differential cross sections for production of alpha particles on the atomic number of the target nucleus was observed, which indicates that fast alpha particles are mainly emitted from the target nucleus; this conclusion was also confirmed by calculations within the time-dependent Schrodinger equation approach. An analysis of the obtained experimental data was carried out within the model of moving sources modified to consider the kinematic limits for two-body and three-body exit channels.