Precision Beta-Spectrum Measurement of RaE with Semiconductor Spectrometers

• Published in: Physics of particles and nuclei Vol. 53; no. 2; pp. 497 - 504
• Main Authors: Derbin, A. V., Lomskaya, I. S., Muratova, V. N., Pilipenko, N. V., Semenov, D. A., Unzhakov, E. V., Drachnev, I. S.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 01.04.2022
• Subjects: Particle and Nuclear Physics; Physics; Physics and Astronomy
• ISSN: 1063-7796; 1531-8559
• DOI: 10.1134/S1063779622020277

Precise knowledge of forbidden transition beta-spectra plays a significant role in both nuclear and particle physics. In this work we present a precision measurement of the beta-spectrum shape for 210 Bi (historically RaE) performed with spectrometers based on semiconductor Si(Li) detectors. This first forbidden non-unique transition has the transition form-factor strongly deviated from unity and knowledge of its spectrum would play an important role in low-background physics in presence of 210 Pb background. The studies were performed with spectrometers in target-detector and 4 . The measured transition form-factor could be approximated as and for the target-detector and 4π spectrometer respectively that is in good agreement between the two experiments as well as with the previous studies. The form-factor parameter precision has been substantially increased with respect to the previous experimental results.