Ядерна фізика та енергетика Nuclear Physics and Atomic Energy   ISSN: 1818-331X (Print), 2074-0565 (Online)   Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine   Languages: Ukrainian, English   Periodicity: 4 times per year   Open access peer reviewed journal

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V. P. Aleshin¹, A. G. Artukh², B. Erdemchimeg^2,3, G. Kaminski^2,4, S. A. Klygin², Yu. M. Sereda^1,2, Yu. G. Teterev², A. N. Vorontsov<sup>1,2

1</sup>Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, Ukraine
²Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, Dubna, Russia
³Nuclear Research Centre of Mongolian National University, Ulanbator, Mongolia
⁴The Henryk Niewodniczanski Institute of Nuclear Physics, Polish Academy of Sciences, Cracow, Poland

Abstract: In the framework of the classical-trajectory method, we analyse zero-angle yields and velocity distributions for the products of fragmentation of ¹⁸O-nucleus with Z > 2 on the ¹⁸¹Ta and ⁹Be targets at the energy 35 MeV/u. The analysis is based on the hypothesis of a two-step mechanism of which the first step is stripping of few nucleons from the projectile during its motion through the target and the second step is fragmentation of the projectile residue when it already left the target. The stripping probability of a nucleon is related with the imaginary part of the nucleon-target optical potential, while fragmentation is described within the Fermi statistical breakup model. The calculations reproduce the general trends of 0° yields of ^13-17O, ^12-17N, ^9-16C, ^8,10-15B, ^7,9-12,14Be, and ^6-9,11Li nuclei, which implies that the two-step mechanism of fragmentation prevails. However, the inability of our calculations to reproduce the complex shape of the velocity spectra indicates that also the prompt disintegration of projectile within the target nucleus contributes to 0° yields.

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