Abstract
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 210Bi (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 210Pb background. The studies were performed with spectrometers in target-detector and 4\(\pi \). The measured transition form-factor could be approximated as \(H(W) = 1 + ( - 0.436 \pm 0.004)W + (0.0523 \pm 0.0010){{W}^{2}}\) and \(H(W) = 1 + ( - 0.436 \pm 0.008)W + \) \((0.0532 \pm 0.0023){{W}^{2}}\) 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.
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ACKNOWLEDGMENTS
This work was supported by the Russian Foundation for Basic Research (projects nos. 19-02-00097 and 20-02-00571).
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Derbin, A.V., Lomskaya, I.S., Muratova, V.N. et al. Precision Beta-Spectrum Measurement of RaE with Semiconductor Spectrometers. Phys. Part. Nuclei 53, 497–504 (2022). https://doi.org/10.1134/S1063779622020277
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DOI: https://doi.org/10.1134/S1063779622020277