A high statistics measurement of the β decay of [Formula Presented] with a cryogenic microcalorimeter has been performed. The high accuracy and the calorimetric nature of the measurement allow setting a value for the end-point energy of the decay in a metallic rhenium crystal equal to [Formula Presented] eV. A good extrapolation of the spectrum to zero energy has also been possible thanks to the stable and well determined detector response down to the energy threshold of about 420 eV. This allows an estimate of the [Formula Presented] half-life of [Formula Presented] Both results are significantly better than the previous measurements reported in the literature.
ASJC Scopus subject areas
- Nuclear and High Energy Physics