Speaker
Description
The isotope 210Bi is an element of 238U natural decay chain. As decay product of 222Rn gas and subsequent long-lived 210Pb, the 210Bi isotope is present inside and on the surface of all structural materials. At present, accurate measurement of 210Bi β-spectrum is necessary for background simulation of modern neutrino and dark matter detectors, as well as for other low-background experiments. In particular, the shape of 210Bi β-spectrum is very similar to the spectrum of recoil electrons from the scattering of solar CNO-neutrinos.
The β-spectrum was measured with two types of Si-spectrometers developed and manufactured at the PNPI. To register electrons in a spectrometer designed according to the classical "target-detector" scheme, a Si(Li) detector 15 mm in diameter and 7 mm thick was used [1]. The main difference of the new 4πβ- spectrometer is the response function, which is close to Gaussian, which does not require careful consideration of electron backscattering from the crystal surface [2,3]. As a result of two independent measurements, the values of the nuclear form factor parameters are determined with an accuracy better than a percent and are consistent with each other.
- Alekseev I.E., Bakhlanov S.V., Derbin A.V., Drachnev I.S., Kotina I.M., Lomskaya I.S., Muratova V.N., Niyazova N.V., Semenov D.A., Trushin M.V., Unzhakov E.V., Phys. Rev. C 102, 064329 (2020).
2 Alekseev I.E., Bakhlanov S.V., Derbin A.V., Drachnev I.S., Kotina I.M., Lomskaya I.S., Muratova V.N., Niyazova N.V., Semenov D.A., Trushin M.V., Unzhakov E.V. J. Phys.: Conf. Ser. 2103, 012144 (2021). - Bakhlanov S.V., Derbin A.V., Drachnev I.S., Kotina I.M., Lomskaya I.S., Muratova V.N., Niyazova N.V., Semenov D.A., Trushin M.V., Unzhakov E.V., Chmell E.A. Instrum. Exp. Tech., 64, 190 (2021).
| Section | 4. Neutrino physics and nuclear astrophysics |
|---|---|
| The speaker is a student or young scientist | No |
