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Published on: May 3, 2019
Measurement of the 171Tm beta spectrum
Frédéric Juget1, Maarten van Dijk2, Emilio Andrea Maugeri3
1Institute of Radiation Physics, Lausanne, Switzerland.
Abstract:
The beta spectrum of the main transition of the β- decay of 171Tm was measured using a double focalizing spectrometer. The instrument was lately improved in order to reduce its low energy threshold to 34 keV. We used the spectrometer to measure the beta spectrum end-point energy of the main transition of 171Tm decay using the Kurie plot formalism. We report a new value of 97.60(38) keV, which is in agreement with previous measurements. In addition, the spectrum shape was compared with the ξ-approximation calculation where the shape factor is equal to 1 and good agreement was found between the theory and the measurement at the 1% level.
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