Observed double beta decay spectra from 82Se, 100Mo, and 150Nd

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Abstract

Two-electron events resembling double beta decay are being observed at energies beyond the die-off of the spectrum predicted for the two-neutrino mode. The anomaly appears in three isotopes having different half lives and Q-values. Tests are now underway to determine its origin.

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This work is supported by the U.S. Department of Energy, Grant DE-FG03-91ER40679.

Present address: Lawrence Livermore National Laboratory, L296, P.O. Box 808, Livermore, CA 94551

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