A. El Boustani³, M. G. Elliott⁷, M. Fertl³, J. A. Formaggio⁵, B. T. Foust⁸, J. K. Gaison⁸, M. Gödel³, M. Grando⁸, P. Harmston⁹, J. Hartse¹, K. M. Heeger¹⁰, X. Huyan^8,‡, A. M. Jones^8,§, B. J. P. Jones⁷, E. Karim¹¹, K. Kazkaz¹², P. T. Kolbeck¹, B. H. LaRoque⁸, M. Li⁵, A. Lindman³, C.-Y. Liu⁹, E. Machado¹, C. Matthé³, R. Mohiuddin¹³, B. Monreal¹³, B. Mucogllava³, R. Mueller², A. Negi⁷, J. A. Nikkel¹⁰, E. Novitski¹, N. S. Oblath⁸, M. Oueslati⁶, J. I. Peña⁵, W. Pettus⁶, V. S. Ranatunga¹³, R. Reimann³, R. G. H. Robertson¹, D. Rosa De Jesús⁸, L. Saldaña¹⁰, V. Sharma¹¹, P. L. Slocum¹⁰, F. Spanier¹⁴, J. Stachurska¹⁵, Y.-H. Sun¹, P. T. Surukuchi¹¹, J. R. Tedeschi⁸, A. B. Telles^10,∥, F. Thomas^3,¶, M. Thomas^8,**, L. A. Thorne³, T. Thümmler¹⁶, L. Tvrznikova^12,††, W. Van De Pontseele¹⁷, B. A. VanDevender^1,8, T. E. Weiss¹⁰, T. Wendler^2,‡‡, M. Wynne¹, K. Young⁹, E. Zayas⁵, and A. Ziegler^2,§§ (Project 8 Collaboration)

• ¹Center for Experimental Nuclear Physics and Astrophysics and Department of Physics, University of Washington, Seattle, Washington 98195, USA
• ²Department of Physics, Pennsylvania State University, University Park, Pennsylvania 16802, USA
• ³Institute for Physics, Johannes Gutenberg University Mainz, 55128 Mainz, Germany
• ⁴Applied Research Laboratory, Pennsylvania State University, University Park, Pennsylvania 16802, USA
• ⁵Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
• ⁶Center for Exploration of Energy and Matter and Department of Physics, Indiana University, Bloomington, Indiana 47405, USA
• ⁷Department of Physics, University of Texas at Arlington, Arlington, Texas 76019, USA
• ⁸Pacific Northwest National Laboratory, Richland, Washington 99354, USA
• ⁹Department of Physics, University of Illinois Urbana-Champaign, Urbana, Illinois 61801, USA
• ¹⁰Wright Laboratory and Department of Physics, Yale University, New Haven, Connecticut 06520, USA
• ¹¹Department of Physics & Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260, USA
• ¹²Lawrence Livermore National Laboratory, Livermore, California 94550, USA
• ¹³Department of Physics, Case Western Reserve University, Cleveland, Ohio 44106, USA
• ¹⁴Institute for Theoretical Astrophysics, Heidelberg University, 69120 Heidelberg, Germany
• ¹⁵Department of Physics and Astronomy, Ghent University, 9000 Ghent, Belgium
• ¹⁶Institute of Astroparticle Physics, Karlsruhe Institute of Technology, 76021 Karlsruhe, Germany
• ¹⁷Physics Department, Colorado School of Mines, Golden, Colorado 80401, USA

• ^*Present Address: Department of Physics, Sharif University of Technology, P.O. Box 11155-9161, Tehran, Iran.
• ^†Present Address: Center for Experimental Nuclear Physics and Astrophysics and Department of Physics, University of Washington, Seattle, Washington 98195, USA.
• ^‡Present Address: LeoLabs, Menlo Park, California 94025, USA
• ^§Present Address: Ozen Engineering, Sunnyvale, California 94085, USA.
• ^∥Contact author: arina.telles@yale.edu
• ^¶Present Address: Telespazio, Darmstadt, Germany.
• ^**Present Address: Booz Allen Hamilton, San Antonio, Texas 78226, USA.
• ^††Present Address: Waymo, Mountain View, California 94043, USA.
• ^‡‡Present Address: Pacific Northwest National Laboratory, Richland, Washington 99354, USA.
• ^§§Present Address: HRL Laboratories LLC, Malibu, California 90265, USA.