V. A. Lyamkin, A. P. Serebrov, D. V. Prudnikov, A. O. Koptyuhov, A. V. Sirotin, G. O. Borodinov, A. A. Nedolyak, P. A. Khazov
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Evaluation of Neutron Storage Time in Closed Chamber of the UCN Source for PIK Reactor
In 2020, a Federal Program for creating experimental facilities for the PIK reactor was started. One of the main facilities to be constructed within this Program is a new superfluid helium-based UCN source for fundamental physics research. The projected UCN density in the closed source vessel is going to be 2.1 × 103 cm–3. Work has been carried out for increasing UCN density in the source vessel by increasing neutron lifetime in superfluid helium. More than 40 m3 of isotopically pure helium-4 with a helium-3 content below 10–11 was produced to virtually eliminate the possibility of neutron absorption. Cryogenic cycle was optimised to obtain minimum helium temperature in the chamber. Work is underway to assemble the entire complex for cryogenic system testing and confirm the operating parameters of the facility.
期刊介绍：
The journal Physics of Particles and Nuclei Letters, brief name Particles and Nuclei Letters, publishes the articles with results of the original theoretical, experimental, scientific-technical, methodological and applied research. Subject matter of articles covers: theoretical physics, elementary particle physics, relativistic nuclear physics, nuclear physics and related problems in other branches of physics, neutron physics, condensed matter physics, physics and engineering at low temperatures, physics and engineering of accelerators, physical experimental instruments and methods, physical computation experiments, applied research in these branches of physics and radiology, ecology and nuclear medicine.
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