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June 22, 2020 to July 2, 2020
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Precision measurement of 144Ce-144Pr beta spectrum with semiconductor spectrometers.

Not scheduled


Ms Irina Lomskaya (PNPI named by B.P. Konstantinov NRCKI)


The artificial source of antineutrinos 144Ce-144Pr is one of the most promising for the sterile neutrino search experiments. We have produced a semiconductor $\beta$-spectrometer with a sensitive region thickness exceeding 9.6 mm that fully absorbs electrons with energy below 3 MeV. It was used for a precise measurement of the $\beta$-spectra of 144Ce-144Pr ground and excited state transitions. The measured spectral shapes correspond to theoretical expectations. This result was used in simulation of scintillator detector experiments with the Monte-Carlo method within GEANT4 for estimation of the sensitivity to sterile neutrino with 144Ce-144Pr antineutrino source and a large scintillation detector. The best sensitivity curves have been obtained for the cylindrical detector geometry for the detector mass of 100 tones. We can estimate that such detector and a source with activity of 100 kCi fully covers the reactor neutrino anomaly at 90% C.L.


Precision measurement of 144Ce-144Pr $\beta$-spectrum for sterile neutrino search experiments.

Primary authors

Prof. Aleksandr Derbin (Petersburg Nuclear Physics Institute NRC KI) Dr Dmitriy Semenov (PNPI NRC KI) Mr Evgeniy Unzhakov (PNPI NRC KI) Dr Igor Alexeev (Ioffe Physical-Technical Institute of the Russian Academy of Sciences) Dr Ilia Drachnev (PNPI-NRC KI) Dr Irina Kotina (PNPI NRC KI) Ms Irina Lomskaya (PNPI named by B.P. Konstantinov NRCKI) Mrs Nelly Niyazova (PNPI NRC KI) Mr Sergey Bakhlanov (PNPI NRC KI) Dr Valentina Muratova (PNPI NRC KI)

Presentation Materials