Электронный каталог

Статья

Basilico, D.
Optimized *a/*b Pulse Shape Discrimination in Borexino / D.Basilico, O.Smirnov, A.Sotnikov, A.Vishneva, [a.o.] // Physical Review D [Electronic resource]. – 2024. – Vol. 109, No. 11. – P. 112014. – URL: https://doi.org/10.1103/PhysRevD.109.112014. – Bibliogr.: 40.

Borexino could efficiently distinguish between 𝛼 and 𝛽 radiation in its liquid scintillator by the characteristic time profile of its scintillation pulse. This 𝛼/𝛽 discrimination, first demonstrated on the ton scale in the counting test facility prototype, was used throughout the lifetime of the experiment between 2007 and 2021. With this method, the 𝛼 events are identified and subtracted from the solar neutrino events similar to 𝛽. This is particularly important in liquid scintillators, as the 𝛼 scintillation is strongly quenched. In Borexino, the prominent *2*1*0Po decay peak was a background in the energy range of electrons scattered from *7Be solar neutrinos. Optimal 𝛼/𝛽 discrimination was achieved with a multilayer perceptron neural network, with a higher ability to leverage the timing information of the scintillation photons detected by the photomultiplier tubes. An event-by-event, high efficiency, stable, and uniform pulse shape discrimination was essential in characterizing the spatial distribution of background in the detector. This benefited most Borexino measurements, including solar neutrinos in the 𝑝⁢𝑝 chain and the first direct observation of the CNO cycle in the Sun. This paper presents key milestones in 𝛼/𝛽 discrimination in Borexino as a term of comparison for current and future large liquid scintillator detectors.



ОИЯИ = ОИЯИ (JINR)2024
Спец.(статьи,препринты) = С 344.1х - Методы регистрации нейтрино
Спец.(статьи,препринты) = С 346.1е - Нейтрино в космогонии и астрофизике
Бюллетени = 31/024