Title: New results of the search for hidden photons by means of a multicathode counter,
Abstract: New upper limit on a mixing parameter for hidden photons with a mass from 5
eV till 10 keV has been obtained from the results of measurements during 78
days in two configurations R1 and R2 of a multicathode counter. For a region of
a maximal sensitivity from 10 eV till 30 eV the upper limit obtained is less
than 4 x 10-11. The measurements have been performed at three temperatures:
26C, 31C and 36C. A positive effect for the spontaneous emission of single
electrons has been obtained at the level of more than 7{\sigma}. A falling
tendency of a temperature dependence of the spontaneous emission rate indicates
that the effect of thermal emission from a copper cathode can be neglected.