Elsevier

Physics Letters B

Volume 173, Issue 4, 19 June 1986, Pages 485-489
Physics Letters B

An upper limit for the mass of upsi;e from tritium β-decay

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Abstract

The endpoint region of the tritium β-spectrum has been measured with 27 eV resolution, using a magnetic spectrometer. The tritium activity was implanted into a thin layer of carbon. The υe mass determined is consistent with zero with an upper limit of 18 eV, which includes instrumental and statistical uncertainties due to the energy loss in the source and the final electronic states.

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Present address: CERN, CH-1211 Geneva 23, Switzerland.

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