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- W2891991632 abstract "We installed a source for ultracold neutrons at a new, dedicated spallation target at TRIUMF. The source was originally developed in Japan and uses a superfluid-helium converter cooled to 0.9K. During an extensive test campaign in November 2017, we extracted up to 325000 ultracold neutrons after a one-minute irradiation of the target, over three times more than previously achieved with this source. The corresponding ultracold-neutron density in the whole production and guide volume is 5.3cm−3. The storage lifetime of ultracold neutrons in the source was initially 37 s and dropped to 24 s during the 18 days of operation. During continuous irradiation of the spallation target, we were able to detect a sustained ultracold-neutron rate of up to 1500s−1. Simulations of UCN production, UCN transport, temperature-dependent UCN yield, and temperature-dependent storage lifetime show excellent agreement with the experimental data and confirm that the ultracold-neutron-upscattering rate in superfluid helium is proportional to T7.3 MoreReceived 12 September 2018Revised 16 December 2018DOI:https://doi.org/10.1103/PhysRevC.99.025503©2019 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasNeutron physicsPhysical SystemsHelium-4 superfluidsNeutron spallation facilitiesNeutronsTechniquesNeutron techniquesParticle sources & targetsNuclear PhysicsParticles & Fields" @default.
- W2891991632 created "2018-09-27" @default.
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- W2891991632 date "2019-02-27" @default.
- W2891991632 modified "2023-10-14" @default.
- W2891991632 title "First ultracold neutrons produced at TRIUMF" @default.
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- W2891991632 doi "https://doi.org/10.1103/physrevc.99.025503" @default.
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