Abstract
A theoretical approach was developed to describe secondary particle emission in heavy ion collisions, with special regards to pre-equilibrium {\alpha}-particle production. Griffin's model of non-equilibrium processes is used to account for the first stage of the compound system formation, while a Monte Carlo statistical approach was used to describe the further decay from a hot source at thermal equilibrium. The probabilities of neutron, proton and {\alpha}-particle emission have been evaluated for both the equilibrium and pre-equilibrium stages of the process. Fission and {\gamma}-ray emission competition were also considered after equilibration. Effects due the possible cluster structure of the projectile which has been excited during the collisions have been experimentally evidenced studying the double differential cross sections of p and {\alpha}-particles emitted in the E=250MeV 16O +116Sn reaction. Calculations within the present model with different clusterization probabilities have been compared to the experimental data.
Highlights
Double-differential spectra δ2σ/δΩδΕ of emitted light charged particles have been measured in the reaction 16O+116Sn at energies of 130MeV and 250MeV with the GARFIELD+HECTOR coupled setups at Laboratori Nazionali di Legnaro
A modified version of the statistical code PACE was used as a basis to describe the emission mechanisms: the main modification was related to the insertion of a non-equilibrium stage in the fusion reaction
Additional effects, as the clustering structure of the projectile nucleus, have to be considered. To this end we propose an upgraded version of the model, which takes into account the projectile cluster structure effects on the particle emission
Summary
Double-differential spectra δ2σ/δΩδΕ of emitted light charged particles have been measured in the reaction 16O+116Sn at energies of 130MeV and 250MeV with the GARFIELD+HECTOR coupled setups at Laboratori Nazionali di Legnaro. This effect is a result of the production of the secondary alpha particles during non-equilibrium stage of fusion nuclear reaction.
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