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Ultracold neutrons (UCNs) are used in experiments investigating fundamentalinteractions, testing the Standard Model of particle physics and searching forphenomena beyond it. Knowledge of the energy spectrum of UCNs is very often akey ingredient to determine the systematic effects in precision measurementsutilizing UCNs. The proposed novel method allows for the in-situ measurementsof the UCN velocity distribution and its time evolution. In addition, theproposed UCN spectrometer can be a handy diagnostic tool for monitoring thespectrum in critical places in the UCN transport system connecting an UCNsource with experiments. In this paper, we show the results from themeasurements performed at the Paul Scherrer Institute's UCN source.

In-situ measurement of the velocity spectrum of ultracold neutrons and its evolution using an oscillating detector