Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2007-06-25
Phys.Lett.B663:181-185,2008
Physics
Nuclear Physics
Nuclear Experiment
16 pages, 8 figures, 2 tables
Scientific paper
10.1016/j.physletb.2008.04.014
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, tau_osc (90% C.L.) > 414 s. The corresponding limit for the mixing energy of the normal and mirror neutron states is delta_m (90% C.L.) < 1.5x10-18 eV.
Aleksandrov E. B.
Dmitriev S. P.
Dovator N. A.
Fomin A. K.
Geltenbort Peter
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