Pre-emission of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>α</mml:mi></mml:math>Particles in Deep-Inelastic Reactions

Abstract

In-plane angular and energy correlations between $\ensuremath{\alpha}$ particles and heavy ejectiles have been measured for the reaction $^{14}\mathrm{N}$ + $^{58}\mathrm{Ni}$ at 148 MeV. The coincidence cross sections may be parametrized as a product of singles cross sections for the detection of $\ensuremath{\alpha}$ particles and heavy ejectiles. The observed correlations indicate that the $\ensuremath{\alpha}$ particles are emitted at an early stage, prior to the formation of the deep-inelastic fragments.