Determination of the $^{8}\mathrm{B}$ Neutrino Spectrum

Determination of the ${}^{8}B$ Neutrino Spectrum

W. T. Winter, S. J. Freedman, K. E. Rehm, I. Ahmad, J. P. Greene, A. Heinz, D. Henderson, R. V. F. Janssens, C. L. Jiang, E. F. Moore, G. Mukherjee, R. C. Pardo, T. Pennington, G. Savard, J. P. Schiffer, D. Seweryniak, G. Zinkann, and M. Paul

Phys. Rev. Lett. 91, 252501 – Published 18 December 2003

Abstract

We have measured the total energy of the alpha particles following the beta decay of ${}^{8}B$ by implanting ${}^{8}B$ into a planar silicon surface barrier detector. Calibration was performed using alpha particles following the beta decay of ${}^{20}{N a}$ , similarly implanted. The alpha spectrum is used to infer the ${}^{8}B$ neutrino spectrum which is an important input in the interpretation of experiments that detect energetic neutrinos from the Sun. The alpha spectrum reported here is in disagreement with the previous best measurement which used two detectors in coincidence.

Received 19 March 2003

DOI:https://doi.org/10.1103/PhysRevLett.91.252501

Authors & Affiliations

W. T. Winter and S. J. Freedman

Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
Physics Department, University of California, Berkeley, California 94720, USA

K. E. Rehm, I. Ahmad, J. P. Greene, A. Heinz, D. Henderson, R. V. F. Janssens, C. L. Jiang, E. F. Moore, G. Mukherjee, R. C. Pardo, T. Pennington, G. Savard, J. P. Schiffer, D. Seweryniak, and G. Zinkann