Abstract
Measurements have been made with curved crystal x-ray spectrometers of the natural line widths of the (Γ=12.1±2 eV), (Γ=12.7±1 eV), and (Γ=19±3 eV) atomic transitions in Tm. These results are combined with published results to determine , , and internal conversion line widths for . These lines have been used in the calibration of a beta spec- trometer for recent measurements of the electron antineutrino mass from the tritium beta decay spectrum. A reanalysis of these results suggests that there is no conclusive evidence for a finite mass for the electron antineutrino.
- Received 18 June 1984
DOI:https://doi.org/10.1103/PhysRevC.31.197
©1985 American Physical Society