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.

Beijing Normal University Beijing

Brookhaven National Laboratory Upton New York

California Institute of Technology Pasadena California 91125

Center for Neutrino Physics Virginia Tech Blacksburg Virginia 24061

Charles University Faculty of Mathematics and Physics Prague Czech Republic

China General Nuclear Power Group Shenzhen

China Institute of Atomic Energy Beijing

Chinese University of Hong Kong Hong Kong

Chongqing University Chongqing

College of Electronic Science and Engineering National University of Defense Technology Changsha

College of William and Mary Williamsburg Virginia 23187

Department of Engineering Physics Tsinghua University Beijing

Department of Nuclear Science and Technology School of Energy and Power Engineering Xi'an Jiaotong University Xi'an

Department of Physics and Astronomy Shanghai Jiao Tong University Shanghai Laboratory for Particle Physics and Cosmology Shanghai

Department of Physics and Astronomy University of California Irvine California 92697

Department of Physics and Astronomy University of Hawaii Honolulu Hawaii

Department of Physics and Astronomy University of Tennessee Knoxville Tennessee

Department of Physics Drexel University Philadelphia Pennsylvania

Department of Physics Illinois Institute of Technology Chicago Illinois

Department of Physics Le Moyne College Syracuse New York

Department of Physics National Taiwan University Taipei

Department of Physics Temple University Philadelphia Pennsylvania

Department of Physics The University of Hong Kong Pokfulam Hong Kong

Department of Physics University of California Berkeley California 94720

Department of Physics University of Cincinnati Cincinnati Ohio 45221

Department of Physics University of Illinois at Urbana Champaign Urbana Illinois 61801

Department of Physics University of Wisconsin Madison Madison Wisconsin

Dongguan University of Technology Dongguan

George W Woodruff School of Mechanical Engineering Georgia Institute of Technology Atlanta Georgia

Guangxi University No 100 Daxue East Road Nanning

High Flux Isotope Reactor Oak Ridge National Laboratory Oak Ridge Tennessee

Institute for Quantum Computing and Department of Physics and Astronomy University of Waterloo Waterloo Ontario

Institute of High Energy Physics Beijing

Institute of Modern Physics East China University of Science and Technology Shanghai

Institute of Physics National Chiao Tung University Hsinchu

Iowa State University Ames Iowa 50011

Joint Institute for Nuclear Research Dubna Moscow Region Russia

Joseph Henry Laboratories Princeton University Princeton New Jersey 08544

Lawrence Berkeley National Laboratory Berkeley California 94720

Nanjing University Nanjing

National Institute of Standards and Technology Gaithersburg Maryland

National United University Miao Li

North China Electric Power University Beijing

Nuclear and Chemical Sciences Division Lawrence Livermore National Laboratory Livermore California

Physics Division Oak Ridge National Laboratory Oak Ridge Tennessee

School of Physics Nankai University Tianjin

Shandong University Jinan

Shenzhen University Shenzhen

Siena College Loudonville New York 12211

Sun Yat Sen University Guangzhou

University of Science and Technology of China Hefei

Wright Laboratory Department of Physics Yale University New Haven Connecticut

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