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arXiv · 2005.08481

Precision measurement of $^{\mathbf{210}}$Bi $β$-spectrum

I. E. Alekseev·S. V. Bakhlanov·A. V. Derbin·I. S. Drachnev·I. M. Kotina·I. S. Lomskaya·V. N. Muratova·N. V. Niyazova·D. A. Semenov·M. V. Trushin·E. V. Unzhakov
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Abstract

The precision measurement of the $β-$spectrum shape for $^{210}$Bi (historically RaE) have been performed with a spectrometer based on semiconductor Si(Li) detector. 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 measured transition form-factor could be approximated as $S(W) = 1 + (-0.4363 \pm 0.0037) W + (0.0523 \pm 0.0010) W^2$, that is in good agreement with previous studies and has significantly increased parameter precision.

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I. E. Alekseev, S. V. Bakhlanov, A. V. Derbin, I. S. Drachnev, I. M. Kotina, I. S. Lomskaya, V. N. Muratova, N. V. Niyazova, D. A. Semenov, M. V. Trushin, E. V. Unzhakov. 2021-01-11. Precision measurement of $^{\mathbf{210}}$Bi $β$-spectrum. https://doi.org/10.1103/physrevc.102.064329

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