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Experimental search for neutron–mirror neutron oscillations using storage of ultracold neutrons

Experimental search for neutron–mirror neutron oscillations using storage of ultracold neutrons,10.1016/j.physletb.2008.04.014,Physics Letters B,A. P.

Experimental search for neutron–mirror neutron oscillations using storage of ultracold neutrons   (Citations: 2)
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A. P. Serebrov, E. B. Aleksandrov, N. A. Dovator, S. P. Dmitriev, A. K. Fomin, P. Geltenbort, A. G. Kharitonov, I. A. Krasnoschekova, M. S. Lasakov, A. N. Murashkin, G. E. Shmelev, V. E. Varlamovhttp://academic.research.microsoft.com/io.ashx?type=5&id=12842907&selfId1=0&selfId2=0&maxNumber=12&query=
The idea of a hidden sector of mirror partners of elementary particles has attracted considerable interest as a possible candidate for dark matter. Recently it was pointed out by Berezhiani and Bento that the present experimental data cannot exclude the possibility of a rapid oscillation of the neutron n to a mirror neutron n′ with oscillation time much smaller than the neutron lifetime. A dedicated search for vacuum transitions n→n′ has to be performed at weak magnetic field, where both states are degenerate. We report the result of our experiment, which compares rates of ultracold neutrons after storage at a weak magnetic field well below 20 nT and at a magnetic field strong enough to suppress the seeked transitions. We obtain a new limit for the oscillation time of n–n′ transitions, τosc(90% C.L.)>414 s. The corresponding limit for the mixing energy of the normal and mirror neutron states is δm(90% C.L.)1.5×10−18 eV.
Journal: Physics Letters B - PHYS LETT B , vol. 663, no. 3, pp. 181-185, 2008
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