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Determination of the B8 neutrino energy spectrum using trapped ions

B. Longfellow1, A. T. Gallant1, T. Y. Hirsh2, M. T. Burkey1, G. Savard3,4, N. D. Scielzo1, L. Varriano3,4, M. Brodeur5, D. P. Burdette3,5 et al.

J. A. Clark3, D. Lascar3,6, P. Mueller3, D. Ray3,7,*, K. S. Sharma7, A. A. Valverde3,7, G. L. Wilson8, and X. L. Yan3

  • 1Lawrence Livermore National Laboratory, Livermore, California 94550, USA
  • 2Soreq Nuclear Research Center, Yavne 81800, Israel
  • 3Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 4Department of Physics, University of Chicago, Chicago, Illinois 60637, USA
  • 5Department of Physics and Astronomy, University of Notre Dame, Notre Dame, Indiana 46556, USA
  • 6Department of Physics and Astronomy, Northwestern University, Evanston, Illinois 60208, USA
  • 7Department of Physics and Astronomy, University of Manitoba, Winnipeg, Manitoba, Canada R3T 2N2
  • 8Department of Physics and Astronomy, Louisiana State University, Baton Rouge, Louisiana 70803, USA

  • *Present address: Physics Department, McGill University, Montreal, Quebec, Canada H3A 2T8, and TRIUMF, Vancouver, British Columbia, Canada V6T 2A3.

Phys. Rev. C 107, L032801 – Published 31 March, 2023

DOI: https://doi.org/10.1103/PhysRevC.107.L032801

Abstract

The β+ decay of B8 provides the dominant source of solar neutrinos above 2 MeV. Consequently, experiments that detect neutrinos from the sun require an accurate determination of the B8 neutrino energy spectrum. In this work, the β-decay Paul trap surrounded by double-sided silicon strip detectors was utilized to precisely measure the decay products of trapped B8 ions. The results were used to determine the Be8 final-state distribution and to reconstruct the neutrino energy spectrum. This measurement using trapped ions is the first of its kind and puts the neutrino energy spectrum on much firmer footing by discriminating between recently reported values for the maximum of the final-state distribution.

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