Fast Charged Particles in the Interaction of {}^{{56}}Fe with Be, Ta, and U Nuclei at an Energy of 400 MeV

Abstract

The energy spectra of alpha particles emitted at an angle of 0{}^{circ} in the interaction of 400-MeV {}^{56}Fe ions with {}^{238}U, {}^{181}Ta, and {}^{9}Be targets were measured by means of a high-resolution magnetic analyzer (MAVR, which is the acronym of the Russian name of this setup). The energy spectra of charged particles ranging from Li to Ne were also measured. The experimental data obtained in this way indicate that the emission of alpha particles is a dominant process in the above reactions. Particles of high energy, up to those in the vicinity of the so-called kinematical limit for two-body reactions, were observed with a rather high yield. The sensitivity of the experimental procedure that employed the aforementioned magnetic analyzer made it possible to observe events characterized by cross-section values smaller by six to eight orders of magnitude than that at the maximum of the spectrum. The cross section for the production of light particles is shown to be dependent on their binding energy in the target. The experimental data obtained in this study were analyzed with aid of the moving-source model.