Statistical model calculations of pre-scission neutron multiplicity for the heavy ion induced fusion-fission reactions with actinide target 232Th
The reaction mechanism of 19F + 232Th and 28Si + 232Th systems populating the near-super-heavy compound nuclei 251Es and 260Rf respectively are investigated using neutron multiplicity as a probe. The prescission neutron multiplicities of these compound nuclei are calculated at different excitation...
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doaj-3784a7d6b3ba4b6c82732867aa939cc42021-08-02T16:04:11ZengEDP SciencesEPJ Web of Conferences2100-014X2015-01-01860006010.1051/epjconf/20158600060epjconf_fusion2015_00060Statistical model calculations of pre-scission neutron multiplicity for the heavy ion induced fusion-fission reactions with actinide target 232ThThakur Meenu0Behera B.R.1Kaur Maninder2Pal Santanu3Sugathan P.4Jhingan Akhil5Department of Physics, Panjab UniversityDepartment of Physics, Panjab UniversityDepartment of Physics, Panjab UniversityFormerly with VECC, KolkataInter University Accelerator Centre Aruna Asaf Ali MargInter University Accelerator Centre Aruna Asaf Ali Marg The reaction mechanism of 19F + 232Th and 28Si + 232Th systems populating the near-super-heavy compound nuclei 251Es and 260Rf respectively are investigated using neutron multiplicity as a probe. The prescission neutron multiplicities of these compound nuclei are calculated at different excitation energies using a statistical model code. These calculations are performed using the Bohr-Wheeler transition state fission width as well as the dissipative dynamical fission width based on the Kramers’ prescription. For 19F + 232Th system, the measured yield of pre-scission is compared with the statistical model calculations for the decay of a compound nucleus in the excitation energy range of 54-90 MeV. The comparison between the measured and the calculated values indicates that the Bohr-Wheeler fission width underestimates the pre-scission neutron yield and a large amount of dissipation strength is required to reproduce the experimental pre-scission neutron multiplicities. The excitation energy dependence of the fitted values of the dissipation coefficient is also discussed. In addition, exploratory statistical model calculations of pre-scission neutron multiplicity for the 28Si + 232Th system are presented in the above range of excitation energy. http://dx.doi.org/10.1051/epjconf/20158600060 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Thakur Meenu Behera B.R. Kaur Maninder Pal Santanu Sugathan P. Jhingan Akhil |
spellingShingle |
Thakur Meenu Behera B.R. Kaur Maninder Pal Santanu Sugathan P. Jhingan Akhil Statistical model calculations of pre-scission neutron multiplicity for the heavy ion induced fusion-fission reactions with actinide target 232Th EPJ Web of Conferences |
author_facet |
Thakur Meenu Behera B.R. Kaur Maninder Pal Santanu Sugathan P. Jhingan Akhil |
author_sort |
Thakur Meenu |
title |
Statistical model calculations of pre-scission neutron multiplicity for the heavy ion induced fusion-fission reactions with actinide target 232Th |
title_short |
Statistical model calculations of pre-scission neutron multiplicity for the heavy ion induced fusion-fission reactions with actinide target 232Th |
title_full |
Statistical model calculations of pre-scission neutron multiplicity for the heavy ion induced fusion-fission reactions with actinide target 232Th |
title_fullStr |
Statistical model calculations of pre-scission neutron multiplicity for the heavy ion induced fusion-fission reactions with actinide target 232Th |
title_full_unstemmed |
Statistical model calculations of pre-scission neutron multiplicity for the heavy ion induced fusion-fission reactions with actinide target 232Th |
title_sort |
statistical model calculations of pre-scission neutron multiplicity for the heavy ion induced fusion-fission reactions with actinide target 232th |
publisher |
EDP Sciences |
series |
EPJ Web of Conferences |
issn |
2100-014X |
publishDate |
2015-01-01 |
description |
The reaction mechanism of 19F + 232Th and 28Si + 232Th systems populating the near-super-heavy compound nuclei 251Es and 260Rf respectively are investigated using neutron multiplicity as a probe. The prescission neutron multiplicities of these compound nuclei are calculated at different excitation energies using a statistical model code. These calculations are performed using the Bohr-Wheeler transition state fission width as well as the dissipative dynamical fission width based on the Kramers’ prescription. For 19F + 232Th system, the measured yield of pre-scission is compared with the statistical model calculations for the decay of a compound nucleus in the excitation energy range of 54-90 MeV. The comparison between the measured and the calculated values indicates that the Bohr-Wheeler fission width underestimates the pre-scission neutron yield and a large amount of dissipation strength is required to reproduce the experimental pre-scission neutron multiplicities. The excitation energy dependence of the fitted values of the dissipation coefficient is also discussed. In addition, exploratory statistical model calculations of pre-scission neutron multiplicity for the 28Si + 232Th system are presented in the above range of excitation energy.
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url |
http://dx.doi.org/10.1051/epjconf/20158600060 |
work_keys_str_mv |
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