Lepton Physics Department

Institute for Nuclear Research
of the National Academy of Sciences of Ukraine

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For the first time a large volume (about 1 kg) lithium molybdate crystal scintillator was produced from enriched 100Mo (Li2100MoO4) to search for neutrinoless double beta decay of 100Mo in the framework of the LUMINEU / LUCINEU projects.

A paper The discovery of neutrino oscillations as a step to unraveling the Universe structure by F.A.Danevich, V.V.Kobychev, V.I.Tretyak is published in the Viche journal of the Verkhovna Rada of Ukraine (the Ukrainian parliament) PDF version

The annual 2016 Lepton Physics Department winter seminars was held from Monday January 11 to Wednesday January 13, 2016. The program of the seminars includes invited talk Search the decay products of dark matter in the cosmic rays by Bohdan Hnatyk from the Astronomical Observatory of the Taras Shevchenko National University of Kyiv

Valentyna Mokina got PhD degree at INR (Kyiv, Ukraine) for thesis "Scintillation detectors based on molybdate and tungstate crystals for double beta-decay search".

The third volume «Dark matter: Observational manifestation and experimental searches» of the book «Dark energy and dark matter in the Universe» (Akademperiodyka, Kyiv, Ukraine, 2015) has been released. The 7th Chapter of the book «Search for effects beyond the Standard Model of particles in low counting experiments» is written by F.A. Danevich, V.V. Kobychev, V.I. Tretyak.

The principal scientific goal of the Lepton Physics Department (LPD) is search for rare or forbidden processes in nuclear and particle physics, mainly for double beta (2β) decay of atomic nuclei. Neutrinoless double beta (2β0ν) decay is forbidden in the Standard Model (SM) of electroweak interactions since it violates lepton number conservation. However, many extensions of the SM predict non-zero neutrino mass and, as a result, 2β0ν processes. Experimental observation of this exotic phenomenon would be an unambiguous signal of new physics which lies beyond the SM and which could be detected without use of huge and extremely expensive accelerators. Relations of neutrino properties with evolution of very early and very old Universe, Solar neutrinos deficit, atmospheric neutrinos anomaly, existence of dark matter in Universe, and structure of modern theories of particle physics, etc., explain the exceptional interest in the 2β decay studies.

Despite numerous efforts since 1948, neutrinoless 2β decay still remains unobserved. However, due to big progress in the experimental technique during the last years, an allowed in the SM two-neutrino 2β decay was observed in direct experiments for 11 nuclei with T1/2 in the range of ~1018-1024 yr, being the most rare observed process of radioactive decay in the nature.

Double β decay experiments demand super-low radioactive background which can be reached only in deep underground laboratories and with detectors constructed with super-pure materials. It gives possibility to simultaneously search for other rare or forbidden processes in nuclear and particle physics, such as decay of electron or nucleons, interactions with dark matter particles, transition of nuclei to super-dense state, violation of the Pauli principle, nuclear decays with cluster emission, rare β and α decays, and others.

During about 35 years the LPD has developed double beta decay investigations. Starting the experiments on the earth level (in 1980), the group afterwards (in 1984) built up an underground laboratory in the Solotvina salt mines (Ukraine).

In memory of Yuri Zdesenko

The LPD group


International collaboration

Main publications


Conferences and workshops organized by the LPD group

Solotvina Underground Laboratory



Useful links

Full list of publications of the LPD group
List of known references on the publications of the LPD group (without self-references)
The most cited LPD works

The article in "2000", 02 Feb 2012, on Dark Matter search (in Russian).

The article in "Zerkalo Nedeli", 30 Dec 2006, on the Solotvina Underground Laboratory and our group (in Russian).

Discussion in "Zerkalo Nedeli" newspaper on how to estimate scientific achievements (in Russian):
  -- the full version of the article published in ZN of 06 Mar 2004;
  -- the reply to comments on this article.

Lepton Physics Department, Institute for Nuclear Research of the National Academy of Sciences of Ukraine
Prospekt Nauky 47, Kyiv MSP 03680, UKRAINE
tel: +380(44)5251111, 5255283, 5252210
fax: +380(44)5254463

Design VIT 2003-2006
VIT & VVK, last updated Nov 28, 2016 by f