Joint Determination of Reactor Antineutrino Spectra from ^{235}U and ^{239}Pu Fission by Daya Bay and PROSPECT.

F P An ,H Liang,S Blyth,M Andriamirado,G Deichert,E Worcester,B Roskovec,A Delgado,S Hans,L Littenberg,M Searles,M Yeh,S Nour,H.-R Pan,M Gonchar,B Viren,M Qi,H Gong,C Morales Reveco,T Xu,V Vorobel,D Berish,J Zhao,M Bishai,C White,S Kohn,K Whisnant,D Venegas-Vargas,M He,L Guo,N Raper,X Qian,J Maricic,J Napolitano,H Steiner,D Naumov,B Heffron,R Leitner,J Larosa,J Wilhelmi,Y Meng,J Dove,M Grassi,J Koblanski,T Classen,S Patton,T Xue,A Woolverton,W.-H Tse,C Marshall,T Hu,C Lu,S Lin,O Kyzylova,S Zeng,R Neilson,A Olshevskiy,R Rosero,R Milinčić ,D Jones ,J L Liu ,Q J Li ,Haoqi Lu ,Vitalii Zavadskyi ,R C Mandujano ,Xin-Heng Guo ,J F Chang ,B R Littlejohn ,B Z ,J H Huang ,R G Wang ,C H Wang ,G F Cao ,Olivia Dalager ,Dmitry Dolzhikov ,P E Mueller ,A Meyer ,C S J Pun ,Y K Hor ,Y Wang ,Y X Chen ,Denis E Bergeron ,Yongbo Huang ,N Y Wang ,J C Peng ,Q M Zhang ,Y Q ,Martin Dvořák ,F Li ,S Li ,W D Li ,J P Gallo ,Zezhong Yu ,H H Zhang ,F Z Qi ,A B Balantekin ,J K C Leung ,H P Mumm ,X Zhang ,Zhaokan Cheng ,R H Li ,X Y ,R L Varner ,H R Band ,Z B Li ,C E Gilbert ,W Gu ,Y F Wang ,Y Chen ,Tadeáš Dohnal ,J Lee ,Xing Zhang ,J Wang ,J H C Lee ,Jie Ren ,Yuda Zeng ,H L Zhuang ,K B Luk ,Ruiting Lei ,Ben Young ,R Hackenburg ,Z Y Zhang ,J L Palomino ,X C Ruan ,C E Tull ,P T Surukuchi ,G L Lin ,M C Chu ,Hanxiong Huang ,J W Zhang ,M J Dolinski ,Ziyi Guo ,C D Bryan ,X Q Li ,Jie Cheng ,Patrick Huber ,D A Dwyer ,Z Wang ,Junpeng Cao ,Fangliang Wu ,X N Li ,S M Chen ,Э Наумова ,L Wen ,F S Deng ,Thi-Thuy-Nghiem Nguyen ,Yayun Ding ,X T Zhang ,B T Foust ,Jing Xu ,S C Li ,Guanghua Gong ,J Park ,Lei Yang ,W Wang ,R D Mckeown ,R Z Zhao ,H L H Wong ,Zhou Li ,H Wei ,Tomáš Tměj ,F Y Zhang ,Baobiao Yue ,J P Ochoa-Ricoux ,K M Heeger ,H L Li ,M V Diwan ,Yun Hsuan Chang ,Liang Zhan ,N S Bowden ,Z Xie ,X B ,Hongzhao Yu ,J Nikkel ,Kirk T Mcdonald ,P Weatherly ,M P Mendenhall ,R A Johnson ,Z J Zhang ,T Langford ,J J Cherwinka ,Y Y Zhang ,Hangkun Xu ,D E Jaffe ,Z J Hu ,S Q Zhang ,M Krämer ,Jun Hu ,X Ji ,Haifeng Yao ,Bei-Zhen Hu ,Z P Zhang ,J C Liu ,M Ye ,Yifan Yang ,Jingyuan Guo ,Changgen Yang ,Lianghong Wei ,C.d Bass ,J M Link ,J K Gaison ,C Lane ,Y K Heng ,X T Huang ,A Galindo‐Uribarri ,Kang Li ,D A Pushin ,Anna Erickson ,Yuhang Guo ,S H Kettell ,H S Chen ,Y Hsiung ,A J Conant ,Y X Zhang ,Qun Wu ,Jian Sun ,K L Jen ,J J Li ,M Wang ,Y M Zhang ,Konstantin Treskov ,X L Ji ,J P Cummings ,Xiaoying Lu ,C Zhang ,Dongmei Xia ,Y F Li ,M A Tyra ,C J Lin ,X Wang ,Saumya Jayakumar ,Diru Wu ,A B Hansell ,W Wu ,Jiajie Ling ,J H Zou

doi:10.1103/physrevlett.128.081801

Abstract

A joint determination of the reactor antineutrino spectra resulting from the fission of ^{235}U and ^{239}Pu has been carried out by the Daya Bay and PROSPECT Collaborations. This Letter reports the level of consistency of ^{235}U spectrum measurements from the two experiments and presents new results from a joint analysis of both data sets. The measurements are found to be consistent. The combined analysis reduces the degeneracy between the dominant ^{235}U and ^{239}Pu isotopes and improves the uncertainty of the ^{235}U spectral shape to about 3%. The ^{235}U and ^{239}Pu antineutrino energy spectra are unfolded from the jointly deconvolved reactor spectra using the Wiener-SVD unfolding method, providing a data-based reference for other reactor antineutrino experiments and other applications. This is the first measurement of the ^{235}U and ^{239}Pu spectra based on the combination of experiments at low- and highly enriched uranium reactors.

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