Radioaktivität

Bothe, W.; Meyer, Stefan; Hahn, Otto; Kirsch, Gerhard

doi:10.1007/978-3-642-90777-7_3

Cited by 1 publication

(1 citation statement)

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“…The decay of radioactive isotopes is regarded as a well-understood Poisson process, independent of external influences [1]. Early experiments tried to affect decay rates by varying the temperature between 24 K and 1280 K, by applying pressure up to 2000 atm, and by increasing the magnetic field up to 83 kG [2][3][4]. All of these experiments either gave null results, or showed effects that could be explained with changes in the counting geometry.…”

Section: Introductionmentioning

confidence: 99%

A precision experiment to investigate long-lived radioactive decays

et al. 2018

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Radioactivity is understood to be described by a Poisson process, yet some measurements of nuclear decays appear to exhibit unexpected variations. Generally, the isotopes reporting these variations have long half lives, which are plagued by large measurement uncertainties. In addition to these inherent problems, there are some reports of time-dependent decay rates and even claims of exotic neutrino-induced variations. We present a dedicated experiment for the stable long-term measurement of gamma emissions resulting from β decays, which will provide high-quality data and allow for the identification of potential systematic influences. Radioactive isotopes are monitored redundantly by thirty-two 76 mm × 76 mm NaI(Tl) detectors in four separate temperature-controlled setups across three continents. In each setup, the monitoring of environmental and operational conditions facilitates correlation studies. The deadtime-free performance of the data acquisition system is monitored by LED pulsers. Digitized photomultiplier waveforms of all events are recorded individually, enabling a study of time-dependent effects spanning microseconds to years, using both time-binned and unbinned analyses. We characterize the experiment's stability and show that the relevant systematics are accounted for, enabling precise measurements of effects at levels well below \order{-4}.

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Section: Introductionmentioning

confidence: 99%