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BMy. CepHH 3. OH3HKA. ACTPOHOMHfl. 2022. №2
Crystal Scintillators for the Dark Matter Directionality Approach
P. Belli1'2, R. Bernabei1'2, V Caracciolo1'2'", R Cerulli1'2, A Leoncini1'2, V Merlo1'2, F Cappella3'4, A Incicchitti3'4, N Cherubini5, E Piccinelli5, F.A Danevich6, D.V Kasperovych6, O.G Polischuk6, V.I Tretyak6
E-mail: avincenzo.caracciolo@roma2.infn.it
1Dip. di Fisica, Universita di Roma «Tor Vergata», Rome, Italy 2Istituto Nazionale di Fisica Nucleare, sez. di Roma «Tor Vergata». Rome, Italy 3Dip. di Fisica, Universita di Roma «La Sapienza», Rome, Italy 4Istituto Nazionale di Fisica Nucleare, sez. di Roma, Roma, Italy 5ENEA, Italian National Agency for New Technologies, Energy and Sustainable Economic Development. Roma
00123, Italy
6 Institute for Nuclear Research, National Academy of Sciences of Ukraine. Kyiv,
Ukraine Received January 06, 2022
Low background anisotropic detectors can offer a unique way to study those Dark Matter (DM) candidate particles able to induce nuclear recoils through the directionality technique. This approach is based on studying the correlation between the nuclear recoils' direction and the Earth motion in the galactic rest frame. Thanks to the anisotropic features of such detectors, a signal, induced by the DM candidates, is expected to change with a particular behaviour as a function of the sidereal time. The ZnWO4 has unique features and it is an excellent candidate for the purposes. Both the light output and the scintillation pulse shape depend on the impinging direction of heavy particles (p, a, nuclear recoils, etc.) with respect to the crystal axes and can supply two independent modes to study the directionality and to discriminate the y/ft radiation (that does not give rise to any anisotropic effects). In this work, the measurements to study the anisotropic response of a ZnWO4 scintillation detector to a particles and to nuclear recoils, induced by neutron scattering, are briefly summarised.
Keywords: dark matter, scintillator, anisotropic, quenching factor, nuclear recoil, ZnWO4.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 306-309.
What a Direct Neutrino Mass Measurement Might Teach Us about the Dark Sector
Michael Klasen E-mail: michael.klasen@uni-muenster.de Institut fur Theoretische Physik, Westfalische Wilhelms-Universitat Munster Wilhelm-Klemm-Strafie 9, 48149 Munster, Germany Received December 22, 2021
Searches for Dark Matter suggest that it couples to ordinary matter only very weakly and possibly only through the Higgs or other scalar bosons. On the other hand, neutrinos might not couple to the Higgs boson directly, but only through a loop of Dark Matter particles, which would naturally explain the small neutrino masses. We demonstrate that current experimental constraints on such a «scotogenic» scenario allow to make the linear dependence of the lightest neutrino mass on the dark sector-Higgs coupling explicit, so that a measurement by the KATRIN experiment would directly determine its value.
Keywords: dark sector, direct neutrino mass measurement, neutrino mass.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 310-314.
PHELEX: Present Status
Anatoly Kopylov", Igor Orekhov, Valery Petukhov E-mail: akopylov@inr.ru
Institute for Nuclear Research, Russian Academy of Sciences Moscow, 117312 Russia Received December 23, 2021
The paper reports the latest results obtained in PHELEX. The focus of work is on diurnal variations of the count rate of single electrons emitted from a cathode as a way to prove that the observed effect is really from dark photons. The authors outline their plans for the future. Keywords: dark matter, dark photons, diurnal variations.
English version: Moscow University Physics Bulletin. 2022. 77, No. 2. Pp. 315-318.
