Direct determination of the <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">U</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>235</mn></mrow></mmultiscripts></mrow></math> to <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi>Pu</mi></mrow><mprescripts></mprescripts><none></none><mrow><mn>239</mn></mrow></mmultiscripts></mrow></math> inverse beta decay yield ratio in the power reactor neutrino experiments

I. Alekseev; V. Belov; A. Bystryakov; M. Danilov; D. Filosofov; M. Fomina; P. Gorovtsov; Ye. Iusko; S. Kazartsev; V. Khvatov; S. Kiselev; A. Kobyakin; A. Krapiva; A. Kuznetsov; I. Machikhiliyan; N. Mashin; D. Medvedev; V. Nesterov; D. Ponomarev; I. Rozova; N. Rumyantseva; V. Rusinov; E. Samigullin; Ye. Shevchik; M. Shirchenko; Yu. Shitov; N. Skrobova; D. Svirida; E. Tarkovsky; E. Yakushev; I. Zhitnikov; A. Yakovleva; D. Zinatulina

doi:10.1103/zrf6-jmww

Direct determination of the ${}^{235}U$ to ${}^{239}{Pu}$ inverse beta decay yield ratio in the power reactor neutrino experiments

I. Alekseev^1,2,3,4, V. Belov^4,5, A. Bystryakov^2,5,6, M. Danilov^2,4, D. Filosofov⁵, M. Fomina⁵, P. Gorovtsov³, Ye. Iusko^1,7, S. Kazartsev^4,5 et al.

V. Khvatov⁸, S. Kiselev⁸, A. Kobyakin^1,2,3, A. Krapiva^1,2,3, A. Kuznetsov⁵, I. Machikhiliyan⁹, N. Mashin^1,2,3, D. Medvedev⁵, V. Nesterov^1,2, D. Ponomarev^2,4,5, I. Rozova⁵, N. Rumyantseva^1,5,6, V. Rusinov^1,2, E. Samigullin^1,2, Ye. Shevchik⁵, M. Shirchenko^4,5, Yu. Shitov¹⁰, N. Skrobova^1,2,4, D. Svirida ^1,2,4, E. Tarkovsky¹, E. Yakushev⁵, I. Zhitnikov^4,5, A. Yakovleva³, and D. Zinatulina^5,11

¹National Research Center “Kurchatov Institute,” Akademik Kurchatov square 1, Moscow 123182, Russia
²Lebedev Physical Institute of the Russian Academy of Sciences, Leninskiy avenue 53, Moscow 119991, Russia
³Moscow Institute of Physics and Technology, Institutskiy lane 9, Dolgoprudny, Moscow Region 141701, Russia
⁴Institute for Nuclear Research of the Russian Academy of Sciences, 60th October Anniversary Prospect 7a, Moscow 117312, Russia
⁵Joint Institute for Nuclear Research, Joliot-Curie street 6, Dubna, Moscow region 141980, Russia
⁶Dubna State University, Universitetskaya street 19, Dubna, Moscow region 141982, Russia
⁷National Research Nuclear University Moscow Engineering Physics Institute, Kashirskoe shosse 31, Moscow 115409, Russia
⁸JSC Rosenergoatom Concern Affiliate—Kalinin Nuclear Power Plant, Udomlya 171841, Russia
⁹Federal State Unitary Enterprise Dukhov Automatics Research Institute, Sushchevskaya street 22, Moscow 127055, Russia
¹⁰Institute of Experimental and Applied Physics, Czech Technical University in Prague, Husova 240/5, Prague 110 00, Czech Republic
¹¹Voronezh State University, Universitetskaya square 1, Voronezh 1394018, Russia

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Phys. Rev. D 112, 112005 – Published 8 December, 2025

DOI: https://doi.org/10.1103/zrf6-jmww

Abstract

The yields of the inverse beta decay events produced by antineutrinos from a certain nuclear reactor fuel component are used by many experiments to check various model predictions. Yet measurements of the absolute yields feature significant uncertainties coming, mainly, from the understanding of the antineutrino detection efficiency. This work presents a simple novel approach to directly determine the ${}^{235}U$ to ${}^{239}{Pu}$ inverse beta decay yield ratio using the fuel evolution analysis. This ratio can be used for a sensitive test of reactor models, while the proposed method, results in smaller systematic uncertainties. The DANSS result on this ratio is one of the most precise among reactor neutrino experiments, yet does not significantly contradict to any previous measurement.

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Direct determination of the ${}^{235}U$ to ${}^{239}{Pu}$ inverse beta decay yield ratio in the power reactor neutrino experiments

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Direct determination of the U235 to Pu239 inverse beta decay yield ratio in the power reactor neutrino experiments

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Direct determination of the ${}^{235}U$ to ${}^{239}{Pu}$ inverse beta decay yield ratio in the power reactor neutrino experiments