Phys. Rev. D 80, 032003 (2009)
Altarev I, Baker CA, Ban G, Bodek K, Daum M, Fierlinger P, Geltenbort P, Green K, van der Grinten MGD, Gutsmiedl E, Harris PG, Henneck R, Horras M, Iaydjiev P, Ivanov S, Khomutov N, Kirch K, Kistryn S, Knecht A, Knowles P, Kozela A, Kuchler F, Kuzniak M, Lauer T, Lauss B, Lefort T, Mtchedlishvili A, Naviliat-Cuncic O, Paul S, Pazgalev A, Pendlebury JM, Petzoldt G, Pierre E, Plonka-Spehr C, Quemener G, Rebreyend D, Roccia S, Rogel G, Severijns N, Shiers D, Sobolev Y, Stoepler R, Weis A, Zejma J, Zenner J, Zsigmond G
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http://dx.doi.org/10.1103/PhysRevD.80.032003
Abstract
We performed ultracold neutron storage measurements to search for additional losses due to neutron (n) to mirror-neutron (n′) oscillations as a function of an applied magnetic field B. In the presence of a mirror magnetic field B′, ultracold neutron losses would be maximal for B≈B′. We did not observe any indication for nn′ oscillations and placed a lower limit on the oscillation time of τnn′ > 12.0 s at 95% C.L. for any B′ between 0 and 12.5 μT.