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I. V. Orekhov

Publications and source records attributed to I. V. Orekhov.

14 recordsLinked to original sources
arXiv2026

The Dark Photon in the PHELEX Experiment

This paper presents diurnal measurements of the single-electron count rate in the PHELEX experiment using multi-cathode counters over the period from 2023 to 2026. The results obtained are interpreted as an indication of a possible effect from dark photons with masses ranging from 10 to 40 eV. The correlation of the measured rates in counters with Fe and Al cathodes suggests that the effect does not depend on the magnetic properties of the cathode material. This can be interpreted as an argument against many dark matter models related to magnetic moments. The result, if confirmed in an independent experiment, could narrow the range of possible candidates to those that interact primarily through an electric (or longitudinal) field, insensitive to spin. A dark photon with kinetic mixing fits this description ideally.

hep-ex↗
arXiv2025

PHELEX: Three Series Of Measurements in the Search for Dark Photons

This paper presents the results of measurements of diurnal variations in the single electron count rate arising from dark photon conversion at the cathode of a gas proportional counter. Three experimental series were conducted, each consisting of 4 runs lasting approximately 60 days per run. One can expect an excess in the single electron count rate above the average level if the polarization vector of dark photons in the region traversed by the Sun forms an angle between 20 and 50 degrees with the Earth's rotational axis. Such an effect was observed in the first series (significance 6 sigma) and the second series (significance 4 sigma). However, in the third series, which employed two identical detectors simultaneously, the effect was not observed on either detector. This result practically excludes the possibility that the effect observed earlier was purely instrumental. The results of the three series may be interpreted as a possible effect arising from the Sun's passage through regions of dark matter characterized by different orientations of the dark photon polarization vector.

hep-ex↗
arXiv2020

About the possibility to observe diurnal variations of the count rate of dark photons by the multicathode counters

The possibility to observe the diurnal variations in the count rate of dark photons using the multicathode counters is investigated. We show that placing detectors at three different mines at different latitudes: Pyhäsalmi in Finland, Baksan at Russia and INO in India and conducting the measurements with three different orientations of detectors one can obtain quite a complete series of data to determine the direction of the dark photon field. We present the results of the measurements fulfilled by the presently developed counters.

physics.ins-det↗
arXiv2018

Looking for Hidden Photon's Cold Dark Matter By Multi-Cathode Counter

The dark rate of single-electrons emitted from a cathode of a multi-cathode counter may be interpreted as the effect from Hidden Photons (HPs) of Cold Dark Matter (CDM). As a tentative approach the measurements have been performed at different temperatures of the counter. Preliminary results of measurements by using a counter with a copper cathode are presented. An upper limit of 4.3x10-23 for parameter ksi^2 at 2 sigma has been obtained for hypothetical conversion of hidden photon to real photon at the metallic surface with the resulting emission of single electron. The work is considered as a pure illustration of the method and the perspectives are discussed for future search of HPs by a multi-cathode counter.

physics.ins-det↗
arXiv2018

Work of a multi-cathode counter in a single electron counting mode

We describe a work of a multi-cathode counter of the developed design in a single electron counting mode with a cathode made of aluminum alloy. The results of the calibration of the counter are presented. The coefficient of gas amplification was found from the calibration spectra. The electric fields and operation of this detector in two configurations are described and the original idea to find the effect from electrons emitted from the surface of a cathode by difference of the rates measured in two volume configurations is expounded. Furthermore, the advantage of using a multi-cathode counter for measurement of the intensity of single electron emission from a metal is explained.

physics.ins-det↗
arXiv2016

The Study of a Temperature Dependence of the Dark Rate of Single Electrons Emitted from a Cathode of a Multi-Cathode Counter as a Method to Search for Hidden Photons of CDM

The dark rate of single electrons emitted from a metal cathode of the counter depends upon a temperature. At cryogenic temperatures the dark rate measured with bi-alkaline cathodes of PMT has been found to increase by lowering the temperature of the detector. One of the possible interpretations of this effect suggests the energy trapping mechanism from the conversion of Hidden Photons of CDM at the surface of a photocathode. The measurements are planned by using a Multi-Cathode Counter (MCC) with a copper and aluminum cathodes of 0.2 m2 at temperatures from 300 K down to 220 K to spot the increase of cryogenic dark rate from Hidden Photons of CDM. The physical motivation and the description of the experiment are presented.

physics.ins-det↗
arXiv2016

On a Search for Hidden Photon CDM by a Multi-Cathode Counter

We report on a new technique of a Multi-Cathode Counter (MCC) developed to search for hidden photon (HP) cold dark matter (CDM) with a mass from 5 to 500 eV. The method is suggested in the assumption that HP-photon mixing causes emission of single electrons from a metal cathode if the mass of hidden photon is greater than a work function of the metal. The measured effect from HP should be dependent on work function of the metal and on the structure of electronic shells of the metal used as a cathode. Potentially this can be used for a verification of the results obtained. Some preliminary results for the upper limit for mixing parameter X have been obtained for HP with a mass from 5 eV to 10 keV as a pure illustration of the potential of this technique. The efforts are continued to refine the procedure of data treatment and to improve the work of MCC. A new detector with a more developed design is under construction.

physics.ins-det↗
arXiv2015

Experience of Using a Multi-Cathode Counter (MCC) in a Search for Hidden Photon CDM

We report on a new technique of a Multi-Cathode Counter (MCC) developed to search for hidden photon (HP) cold dark matter (CDM) with a mass from 5 to 500 eV. The method suggested in the assumption that hidden photons of the mass greater than a work function of the metal, the cathode of the counter is fabricated induce emission of single electrons from a cathode. Three configurations of the same counter are used to measure the count rates R1, R2 and R3 of the single electron events during several weeks. As a measure of the effect from HP the difference R1-(R2-D3/D2xR3) has been used. Some preliminary results have been obtained on a first try to search for HP with a mass from 5 to 500 eV. The upper limit for mixing parameter X has been set on the level of 3.3x10-10 for hidden photon mass from 9 to 100 eV. In our plans is to refine the procedure of data treatment and to continue the measurements to collect more data.

physics.ins-det↗
arXiv2015

Using a Multi-Cathode Counter (MCC) in the Search for Hidden Photon CDM

We report on a new technique of a Multi-Cathode Counter (MCC) developed to search for hidden photon (HP) cold dark matter (CDM) with a mass from 5 to 10 eV. The method suggested in the assumption that hidden photons of the mass greater than a work function of the metal, the cathode of the counter is fabricated induce emission of single electrons from a cathode. Three configurations of the same counter are used to measure the count rates R1, R2 and R3 of the single electron events sequentially each week, where the difference R1- R2 measures the effect from HP and R3 is used as a reference sequence to monitor the counting process. At present the work is aimed to refine the procedure of data treatment and to look for long term variations which should be accounted for in the final analysis of data.

physics.ins-det↗
arXiv2014

Gaseous Detector with sub keV Threshold to Study Neutrino Scattering at Low Recoil Energies

Gaseous detector with a sub keV electron equivalent threshold is a very perspective tool for the precision measurement of the neutrino magnetic moment and to observe coherent scattering of neutrinos on nuclei. The progress in the development of low noise electronics makes it possible to register the rare events at the threshold less than 100 eV. The construction of the gaseous detector is given and the typical pulses with amplitudes of a few eV observed on a bench scale installation are presented. The possible implications for future experiments are discussed.

physics.ins-det↗
arXiv2013

Large Gaseous Detector of Ionizing Eradiation in Search for Coherent Neutrino-Nucleus Scattering

We propose to search for coherent neutrino-nucleus scattering (CNNS)by means of a triple-sectioned low background proportional counter. As a working medium we plan to use argon and xenon at about 1 MPa. We have shown using bench-scale assembly, that pulse-shape discrimination enables to effectively suppress noise pulses from electromagnetic disturbances and microphonic effect in the energy region where one expects signal from CNNS (from 20 eV to 100 eV) with a factor of about $10^3$. The calculation has been done of the background from neutrons, generated by muons of cosmic rays. The experimental setup has been proposed.

physics.ins-det↗
arXiv2009

A Lithium-Beryllium Method for the Detection of Solar Neutrinos

A method for the detection of solar neutrino has been developed using the laboratory bench installations. The efficiency of the extraction of beryllium from lithium as high as 96.4{%} has been achieved, and it was shown that lithium losses during the extraction were less than 1{%}. The prospects of a full-scale experiment with a 10-t lithium detector consisting of twenty 500-kg lithium modules are discussed. The technical solutions formulated on the basis of this study enable to make design of a pilot lithium installation containing 500 kg of metallic lithium

nucl-ex↗