Determination of angular momenta in the incomplete-fusion channels of the reactions Ta+ 22Ne and Ir+ 12C
By using the γ-ray-multiplicity technique, experiments were carried out to determine the input angular momenta lin corresponding to the heavy-ion induced incomplete-fusion reactions involving the emission of fast charged particles. The α-particle and Li-nuclei emission channels were investigated in the reaction 181Ta + 22Ne at the average Ne-ion energy of 155 MeV and for the α-particle emission channel in the reaction natIr+ 12C at E = 100 MeV. The separation of the reaction channels was carried out using an X-ray spectrometer. The angular distributions of the fission fragments were measured in the reaction 181Ta( 22Ne, αf). The data obtained indicate that input angular momenta are equal to about 60 ħ and 50 ħ for the channels of Li emission and α-emission, respectively, being practically independent of the particle energy. For the α-emission channel the lin values are the same for both reactions within experimental errors. The lifetime of the system of interacting target and projectile nuclei, prior to the emission of an α-particle, has been estimated to be equal to 10 -20s.