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- W4386861271 abstract "Abstract The ultracold neutron (UCN) source at the Paul Scherrer Institute (PSI) provides high intensities of storable neutrons for fundamental physics experiments. The neutron velocity spectrum parallel to the beamline axis was determined by time-of-flight spectroscopy using a neutron chopper. In particular, the temporal evolution of the spectrum during neutron production and UCN storage in the source storage volume was investigated and compared to Monte Carlo simulation results. A softening of the measured spectrum from a mean velocity of 7.7(1)–5.1(1) $$hbox {m s}^{-1}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mrow> <mml:mtext>m</mml:mtext> <mml:mspace /> <mml:msup> <mml:mtext>s</mml:mtext> <mml:mrow> <mml:mo>-</mml:mo> <mml:mn>1</mml:mn> </mml:mrow> </mml:msup> </mml:mrow> </mml:math> occurred within the first 30 $$hbox {s}$$ <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML> <mml:mtext>s</mml:mtext> </mml:math> after the proton beam pulse had impinged on the spallation target. A spectral hardening was observed over longer time scales of one measurement day, consistent with the effect of surface degradation of the solid deuterium moderator." @default.
- W4386861271 created "2023-09-20" @default.
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- W4386861271 date "2023-09-19" @default.
- W4386861271 modified "2023-10-14" @default.
- W4386861271 title "Time-of-flight spectroscopy of ultracold neutrons at the PSI UCN source" @default.
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- W4386861271 doi "https://doi.org/10.1140/epja/s10050-023-01104-6" @default.
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