Semiclassical approach to sequential fission in peripheral heavy-ion collisions

Andrea Strazzeri,Antonio Italiano,V Greco,S Pirrone,M La Cognata,C Spitaleri,F Rizzo

doi:10.1051/epjconf/201611708024

Andrea Strazzeri, Antonio Italiano + Show 5 more

Open Access

https://doi.org/10.1051/epjconf/201611708024

Copy DOI

Abstract

A closed-form theoretical approach describing in a single picture both the evaporation component and the fast nonequilibrium component of the sequential fission of projectilelike fragments in a semiperipheral heavy-ion collision is derived and then applied to the dynamical fission observed in the 124 Sn + 64 Ni semiperipheral collision at 35A MeV. Information on opposite polarization effects of the fissioning projectilelike fragments and on their “formation-to-fast fission lifetimes” are obtained.

Highlights

In the past years several studies of sequential fission of the heavier product observed in peripheral heavy-ion collisions have revealed that the measured in-plane angular correlations between the fissioning projectilelike (PL) nucleus and the heavier fission fragment are sharply forward peaked and not symmetric with respect to the direction of the PL fragment with marked differences between distributions for positive and negative angles with a clear indication of a fast nonequilibrium component besides the equilibrated evaporative component ( [1, 2] and references therein)
We here show that many of the features observed can be explained by means of a closed-form which combines in a single picture both the evaporation component and the fast nonequilibrium component of the sequential fission of the PL fragments following a peripheral heavy-ion collision
This approach is applied to the dynamical fission of PL fragments in the 124Sn+64N i collision at 35A MeV [2]

Summary

Introduction

In the past years several studies of sequential fission of the heavier product observed in peripheral heavy-ion collisions have revealed that the measured in-plane angular correlations between the fissioning projectilelike (PL) nucleus and the heavier fission fragment are sharply forward peaked and not symmetric with respect to the direction of the PL fragment with marked differences between distributions for positive and negative angles with a clear indication of a fast nonequilibrium component besides the equilibrated evaporative component ( [1, 2] and references therein).

Results

Conclusion