Author/Authors :
A. Alessandrello، نويسنده , , J.W. Beeman، نويسنده , , C. Brofferio، نويسنده , , O. Cremonesi، نويسنده , , E. Fiorini، نويسنده , , A. Giuliani، نويسنده , , E.E. Haller، نويسنده , , B. Margesin، نويسنده , , A. Monfardini، نويسنده , , A. Nucciotti، نويسنده , , M. M. Pavan، نويسنده , , G. Pessina، نويسنده , , G. Pignatel، نويسنده , , E. Previtali، نويسنده , , L. Zanotti، نويسنده , , M. Zen، نويسنده ,
Abstract :
Crystals of silver perrhenate were used for the first time in the bolometric measurement of the spectrum of 187Re with the aim of determining the electron antineutrino mass. The temperature rise was measured by means of neutron transmutation doped germanium and P-implanted silicon thermistors. The energy scale was calibrated using the K lines of Mn and the fluorescence L lines of Sn. Bolometers made from crystals of masses ranging from ∼250 to ∼500 μg were run with FWHM resolutions on the Sn lines ranging from 25 to 60 eV. The end point of the spectrum was located at 2460±5stat±10syst eV. The measured half lifetime was 43±4stat±3syst Gyr, which is in good agreement with the values obtained with mass spectroscopy from the build-up of 187Os in rhenium samples. The sensitivity of the measurement on a non-zero neutrino mass achievable with these bolometers is discussed.
