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Experimental Setup for Neutron Lifetime Measurements with a Large Gravitational Trap at Low Temperatures

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Abstract

Currently the most accurate measurements of neutron lifetime are being performed at the Petersburg Nuclear Physics Institute with ultracold neutrons (UCNs) stored in a gravitational trap. A modified setup with a large gravitational trap and cooling to 10–15 K is presented. The results of measurements of temperature dependence of UCN losses in collisions with walls, which were coated with a perfluorinated grease (Fomblin UT 18), at 300–77 K, are detailed. The probable heat inflow to the trap is estimated, and the feasibility of cooling to indicated temperatures in experiments with the modified setup is demonstrated.

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Authors and Affiliations

  1. Petersburg Nuclear Physics Institute, National Research Centre Kurchatov Institute, 188300, Gatchina, Leningrad oblast, Russia

    A. P. Serebrov, E. A. Kolomenskii, A. K. Fomin, A. O. Koptyukhov, I. A. Krasnoshchekova, A. V. Vasil’ev, D. M. Prudnikov, I. V. Shoka, A. V. Chechkin, M. E. Chaikovskii, V. E. Varlamov, S. N. Ivanov & A. N. Pirozhkov

  2. Institut Laue–Langevin, 38042, Grenoble, France

    P. Geltenbort, O. Zimmer & T. Jenke

  3. Science and Technology Facilities Council, Rutherford Appleton Laboratory, Harwell Campus, OX11 0QX, Didcot, United Kingdom

    M. G. D. van der Grinten & M. A. H. Tucker

Authors
  1. A. P. Serebrov
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  2. E. A. Kolomenskii
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  3. A. K. Fomin
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  4. A. O. Koptyukhov
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  5. I. A. Krasnoshchekova
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  6. A. V. Vasil’ev
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  7. D. M. Prudnikov
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  8. I. V. Shoka
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  9. A. V. Chechkin
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  10. M. E. Chaikovskii
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  11. V. E. Varlamov
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  12. S. N. Ivanov
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  13. A. N. Pirozhkov
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  14. P. Geltenbort
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  15. O. Zimmer
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  16. T. Jenke
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  17. M. G. D. van der Grinten
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  18. M. A. H. Tucker
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Corresponding author

Correspondence to S. N. Ivanov.

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Translated by D. Safin

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Serebrov, A.P., Kolomenskii, E.A., Fomin, A.K. et al. Experimental Setup for Neutron Lifetime Measurements with a Large Gravitational Trap at Low Temperatures. Tech. Phys. 64, 282–286 (2019). https://doi.org/10.1134/S1063784219020191

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  • DOI: https://doi.org/10.1134/S1063784219020191

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