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APS » Journals » Phys. Rev. Lett. » Volume 91 » Issue 25
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Phys. Rev. Lett. 91, 252501 (2003) [4 pages]

Determination of the 8B Neutrino Spectrum

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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
Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA

M. Paul
Racah Institute of Physics, Hebrew University, Jerusalem, Israel 91904

Received 19 March 2003; revised 22 September 2003; published 18 December 2003

We have measured the total energy of the alpha particles following the beta decay of 8B by implanting 8B into a planar silicon surface barrier detector. Calibration was performed using alpha particles following the beta decay of 20Na, similarly implanted. The alpha spectrum is used to infer the 8B 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.

© 2003 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.252501
DOI:
10.1103/PhysRevLett.91.252501
PACS:
23.40.Bw, 23.60.+e, 26.65.+t, 27.20.+n
 
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