A precision experiment to investigate long-lived radioactive decays
作者： J.R. Angevaare , P. Barrow , L. Baudis , P.A. Breur , A. Brown
DOI: 10.1088/1748-0221/13/07/P07011
关键词: Detector 、 Stability (probability) 、 Isotope 、 Physics 、 Radionuclide 、 Photomultiplier 、 Instrumentation 、 Data acquisition 、 Nuclear physics 、 Poisson process
摘要: Radioactivity is understood to be described by a Poisson process, yet some measurements of nuclear decays appear exhibit unexpected variations. Generally, the isotopes reporting these variations have long half lives, which are plagued large measurement uncertainties. In addition inherent problems, there reports time-dependent decay rates and even claims exotic neutrino-induced We present dedicated experiment for stable long-term gamma emissions resulting from β decays, will provide high-quality data allow identification potential systematic influences. Radioactive monitored redundantly thirty-two 76 mm × NaI(Tl) detectors in four separate temperature-controlled setups across three continents. each setup, monitoring environmental operational conditions facilitates correlation studies. The deadtime-free performance acquisition system LED pulsers. Digitized photomultiplier waveforms all events recorded individually, enabling study effects spanning microseconds years, using both time-binned unbinned analyses. characterize experiment's stability show that relevant systematics accounted for, precise at levels well below \order{-4}.
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