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Mass Yield Distribution in the Quasi-Mono-Energetic Neutron-Induced Fission of 238U.

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Title: Mass Yield Distribution in the Quasi-Mono-Energetic Neutron-Induced Fission of 238U.
Authors: Naik, H.1 (AUTHOR) naikhbarc@yahoo.com, Karkera, Meghna2 (AUTHOR), Vansola, Vibha3 (AUTHOR), Yeraguntla, Santhi Sheela2 (AUTHOR), Mehta, Mayur4 (AUTHOR), Suryanarayana, S. V.5 (AUTHOR), Makwana, R.3 (AUTHOR), Sharma, S. C.5 (AUTHOR)
Source: Nuclear Science & Engineering. Sep2025, Vol. 199 Issue 9, p1406-1424. 19p.
Subjects: Nuclear fission, Nuclear structure, Gamma ray spectrometry, Uranium isotopes, Distribution (Probability theory), Excited state energies
Abstract: Fission product cumulative yields within the mass ranges of 83 to 117 and 123 to 153 have been measured in the 4.93- and 8.31-MeV quasi-mono-energetic neutron-induced fission of 238U by using an off-line gamma-ray spectrometric technique. From the cumulative yields, the mass chain yields were obtained by applying charge distribution correction. From the mass yield data, the peak-to-valley (P/V) ratio, the average values of light mass and heavy mass , and the average number of neutrons <υ> were obtained. The data from the present work and literature in the 238U(n,f) reaction at various energies were compared with similar data in the 238U(γ,f) reaction. In both the reactions, the mass yield distributions are asymmetric and double humped. The yields of fission products for A = 133 to 134, A = 138 to 140, and A = 143 to 144 and their complementary products are higher than those of other fission products because of the nuclear structure effect. With the increase of excitation energy, the yield of the symmetric product increases, which causes a decrease of the P/V ratio. The <υ> value also increases with excitation energy in a similar way in both the reactions. However, it is surprising to see a different changing trend of and values with an increase of excitation energy between the 238U(n,f) and 238U(γ,f) reactions. [ABSTRACT FROM AUTHOR]
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Abstract:Fission product cumulative yields within the mass ranges of 83 to 117 and 123 to 153 have been measured in the 4.93- and 8.31-MeV quasi-mono-energetic neutron-induced fission of 238U by using an off-line gamma-ray spectrometric technique. From the cumulative yields, the mass chain yields were obtained by applying charge distribution correction. From the mass yield data, the peak-to-valley (P/V) ratio, the average values of light mass <AL> and heavy mass <AH>, and the average number of neutrons <υ> were obtained. The data from the present work and literature in the 238U(n,f) reaction at various energies were compared with similar data in the 238U(γ,f) reaction. In both the reactions, the mass yield distributions are asymmetric and double humped. The yields of fission products for A = 133 to 134, A = 138 to 140, and A = 143 to 144 and their complementary products are higher than those of other fission products because of the nuclear structure effect. With the increase of excitation energy, the yield of the symmetric product increases, which causes a decrease of the P/V ratio. The <υ> value also increases with excitation energy in a similar way in both the reactions. However, it is surprising to see a different changing trend of <AL> and <AH> values with an increase of excitation energy between the 238U(n,f) and 238U(γ,f) reactions. [ABSTRACT FROM AUTHOR]
ISSN:00295639
DOI:10.1080/00295639.2025.2455888