The pre- and post-scission neutron multiplicities are measured for the fission of 208Rn, populated with the reactions 30Si+178Hf and 48Ti+160Gd in the excitation energy range of 54.5 - 80.8 MeV. We found significant differences in the pre-scission neutron multiplicities of these two systems. Also, both the reactions exhibit an enhancement in the pre-scission multiplicity with respect to the existing data for the 16O+194Pt reaction populating 210Rn. The measured multiplicities are compared with the theoretical predictions obtained from the Langevin dynamical model for fission. Dynamical simulations are also performed to estimate the capture cross-sections. Contribution of the neutrons, emitted during the fusion process, is shown to be crucial in determining the neutron multiplicities for the present systems. Moreover, in case of the 48Ti+160Gd reaction, rapid quasi-fission dynamics prevents neutron emission from the thermalized target-projectile composite. The present measurement helps us to understand the relative importance of fusion and quasi-fission processes and their timescales depending on the entrance channel mass asymmetry.
|Journal||Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics|
|State||Published - 10 Mar 2021|
Bibliographical noteFunding Information:
Authors acknowledge the Pelletron group and Target Laboratory of IUAC for their support during the experiments. One of the authors (N.K.), acknowledges the financial assistance provided by CSIR and IUAC , in the form of Senior Research Fellowship [ 09/045(1567)/2018-EMR-I ] and Project Fellowship ( UFR-52305 ), respectively. S.V. acknowledges the support of the University of Delhi in the form of R&D Grant.
© 2021 The Author(s)
- Dynamical model calculations
- Neutron multiplicity
- Nuclear fission dynamics