YAP:Ce scintillator as an absolute ultracold neutron detector
arxiv(2024)
摘要
The upcoming UCNProBe experiment at Los Alamos National Laboratory will
measure the β-decay rate of free neutrons with different systematic
uncertainties than previous beam-based neutron lifetime experiments. We have
developed a new ^10B-coated YAP:Ce scintillator whose properties are
presented. The advantage of the YAP:Ce scintillator is its high Fermi
potential, which reduces the probability for upscattering of ultracold
neutrons, and its short decay time, which is important at high counting rates.
Birks' coefficient of YAP:Ce was measured to be (5.56^+0.05_-0.30)×
10^-4 cm/MeV and light losses due to 120 nm of ^10B-coating to be about
60
polystyrene scintillator was about 50
that are captured on the ^10B coating is (86.82 ± 2.61)
with ultracold neutrons showed that YAP:Ce crystal counted 8
compared to ZnS screen. This may be due to an uneven coating of ^10B on the
rough surface.
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