Abstract
An overview of the experimental result on simultaneous measurement of pre-scission neutron, proton, α-particle and GDR γ-ray multiplicities for the reaction 28Si +175Lu at 159 MeV using the BARC–TIFR Pelletron–LINAC accelerator facility is given. The data were analysed using deformation-dependent particle transmission coefficients, binding energies and level densities which are incorporated in the code JOANNE2 to extract fission time-scales and mean deformation of the saddle-to-scission emitter. The neutron, light charged particle and GDR γ-ray multiplicity data could be explained consistently. The emission of neutrons seems to be favoured towards larger deformation as compared to charged particles. The pre-saddle time-scale is deduced as (0–2) × 10−21 s whereas the saddle-to-scission time-scale is (36–39) × 10 −21 s. The total fission time-scale is deduced as (36–41) × 10 −21 s.
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Acknowledgements
The authors thank A Mitra and S K Rathi for their valuable help and S S Kapoor for his suggestions. The authors also thank the LINAC-Pelletron accelerator facility staff for the smooth operation of the accelerator and A B Parui, H H Oza and R P Vind for their help during the experiment.
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RAMACHANDRAN, K., CHATTERJEE, A., Navin, A. et al. Fission time-scale from the measurement of pre-scission light particles and γ-ray multiplicities. Pramana - J Phys 85, 335–343 (2015). https://doi.org/10.1007/s12043-015-1048-y
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DOI: https://doi.org/10.1007/s12043-015-1048-y
Keywords
- Fusion–fission
- fission time-scale
- pre-scission time
- saddle-to-scission time
- pre-scission neutron multiplicity
- pre-scission proton multiplicity
- pre-scission α-particle multiplicity
- pre-scission GDR γ-ray multiplicity.