Observation of gravitationally induced vertical striation of polarized ultracold neutrons by spin-echo spectroscopy

Afach, S, Ayres, N J, Ban, G, Bison, G, Bodek, K, Chowdhuri, Z, Daum, M, Fertl, M, Franke, B, Griffith, W C, Grujić, Z D, Harris, P G, Heil, W, Hélaine, V, Kasprzak, M, Kermaidic, Y, Kirch, K, Knowles, P, Koch, H -C, Komposch, S, Kozela, A, Krempel, J, Lauss, B, Lefort, T, Lemière, Y, Mtchedlishvili, A, Musgrave, M, Naviliat-Cuncic, O, Pendlebury, J M, Piegsa, F M, Pignol, G, Plonka-Spehr, C, Prashanth, P N, Quéméner, G, Rawlik, M, Rebreyend, D, Ries, D, Roccia, S, Rozpedzik, D, Schmidt-Wellenburg, P, Severijns, N, Thorne, J A, Weis, A, Wursten, E, Wyszynski, G, Zejma, J, Zenner, J and Zsigmond, G (2015) Observation of gravitationally induced vertical striation of polarized ultracold neutrons by spin-echo spectroscopy. Physical Review Letters, 115 (16). p. 162502. ISSN 0031-9007

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We describe a spin-echo method for ultracold neutrons (UCNs) confined in a precession chamber and exposed to a |B 0 |=1  μT magnetic field. We have demonstrated that the analysis of UCN spin-echo resonance signals in combination with knowledge of the ambient magnetic field provides an excellent method by which to reconstruct the energy spectrum of a confined ensemble of neutrons. The method takes advantage of the relative dephasing of spins arising from a gravitationally induced striation of stored UCNs of different energies, and also permits an improved determination of the vertical magnetic-field gradient with an exceptional accuracy of 1.1  pT/cm . This novel combination of a well-known nuclear resonance method and gravitationally induced vertical striation is unique in the realm of nuclear and particle physics and should prove to be invaluable for the assessment of systematic effects in precision experiments such as searches for an electric dipole moment of the neutron or the measurement of the neutron lifetime.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Physics and Astronomy
Subjects: Q Science > QC Physics
Depositing User: Richard Chambers
Date Deposited: 20 May 2016 07:25
Last Modified: 29 Aug 2018 14:07
URI: http://srodev.sussex.ac.uk/id/eprint/61101

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Project NameSussex Project NumberFunderFunder Ref
Magnetic Field Uniformity and Ultracold Neutron Storage Optimization for CryoEDMG1288STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCILST/L006472/1