Emission of High-Energy Alpha Particles in the Interaction of ^48 Ca Nuclei with Tantalum, Gold, and Uranium Nuclei at 280 MeV

The energy spectra of alpha particles from reactions induced by 280-MeV ^48 Ca beams incident to ^181 Ta, ^197 Au, and ^238 U targets were measured at an angle of 0 ^∘ by means of a high-resolution magnetic analyzer (MAVR setup). The sensitivity of the procedure used made it possible to measure alpha-particle yields that are five to six orders of magnitude less than the maximum yield. The cross section for the formation of alpha particles is shown to be dependent on their binding energy in the target nucleus. The experimental data obtained from these measurements were analyzed on the basis of the model of two- and three-body reaction channels and the model of moving sources.