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Mass yield distributions of fission products from photo-fission of $^{238}$U induced by 11.5–17.3 MeV bremsstrahlung

Abstract : The yields of various fission products in the 11.5, 13.4, 15.0 and 17.3 MeV bremsstrahlung-induced fission of 238U have been determined by recoil catcher and an off-line γ-ray spectrometric technique using the electron linac, SAPHIR at CEA, Saclay, France. The mass yield distributions were obtained from the fission product yields using charge-distribution corrections. The peak-to-valley (P/V ratio, average light mass (〈AL〉) and heavy mass (〈AH〉) and average number of neutrons (〈v〉) in the bremsstrahlung-induced fission of 238U at different excitation energies were obtained from the mass yield data. From the present and literature data in the 238U (γ, f ) and 238U (n, f ) reactions at various energies, the following observations were obtained: i) The mass yield distributions in the 238U (γ, f ) reaction at various energies of the present work are double-humped, similar to those of the 238U (n, f ) reaction of comparable excitation energy. ii) The yields of fission products for A = 133–134, A = 138–140, and A = 143–144 and their complementary products in the 238U (γ, f) reaction are higher than other fission products due to the nuclear structure effect. iii) The yields of fission products for A = 133–134 and their complementary products are slightly higher in the 238U (γ, f ) than in the 238U (n, f ) , whereas for A = 138–140 and 143–144 and their complementary products are comparable. iv) With excitation energy, the increase of yields of symmetric products and the decrease of the peak-to-valley (P/V ratio in the 238U (γ, f) reaction is similar to the 238U (n, f) reaction. v) The increase of 〈v〉 with excitation energy is also similar between the 238U (γ, f ) and 238U (n, f) reactions. However, it is surprising to see that the 〈AL〉 and 〈AH〉 values with excitation energy behave entirely differently from the 238U (γ, f ) and 238U (n, f ) reactions.
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https://hal-cea.archives-ouvertes.fr/cea-01815539
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Submitted on : Thursday, June 14, 2018 - 11:42:42 AM
Last modification on : Thursday, August 20, 2020 - 4:14:07 PM

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H. Naik, Frédéric Carrel, G. Kim, Frederic Laine, Adrien Sari, et al.. Mass yield distributions of fission products from photo-fission of $^{238}$U induced by 11.5–17.3 MeV bremsstrahlung. European Physical Journal A, EDP Sciences, 2013, 49 (94), pp.13094-7. ⟨10.1140/epja/i2013-13094-7⟩. ⟨cea-01815539⟩

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