Probing entrance channel effects in fusion-fission dynamics through neutron multiplicity measurement of Rn-208
| Autor: | A. Banerjee, Jhilam Sadhukhan, S. Verma, Anjali Rani, P. Sugathan, Akhil Jhingan, Abhishek Yadav, K. S. Golda, Kavita, Meenu Thakur, B. R. Behera, Suresh Kumar, Rajesh Kumar, Ruchi Mahajan, Unnati, Neeraj Kumar, M. S. A. Kumar, K. Rojeeta Devi, S. K. Mandal, Neelam, Gurpreet Kaur, N. Saneesh, Shabnam Mohsina |
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| Rok vydání: | 2021 |
| Předmět: |
Physics
Nuclear and High Energy Physics Fusion Range (particle radiation) Neutron multiplicity 010308 nuclear & particles physics Neutron emission Fission Dynamics (mechanics) Nuclear Theory Dynamical model calculations Multiplicity (mathematics) 01 natural sciences lcsh:QC1-999 Nuclear physics Nuclear fission dynamics 0103 physical sciences Neutron PARTÍCULAS (FÍSICA NUCLEAR) 010306 general physics Nuclear Experiment Excitation lcsh:Physics |
| Zdroj: | Repositório Institucional da USP (Biblioteca Digital da Produção Intelectual) Universidade de São Paulo (USP) instacron:USP Physics Letters B, Vol 814, Iss, Pp 136062-(2021) |
| Popis: | The pre- and post-scission neutron multiplicities are measured for the fission of 208Rn, populated with the reactions 30Si + 178 Hf and 48Ti + 160 Gd 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 + 194 Pt 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 + 160 Gd 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. |
| Databáze: | OpenAIRE |
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