Ядерна фізика та енергетика Nuclear Physics and Atomic Energy   ISSN: 1818-331X (Print), 2074-0565 (Online)   Publisher: Institute for Nuclear Research of the National Academy of Sciences of Ukraine   Languages: Ukrainian, English   Periodicity: 4 times per year   Open access peer reviewed journal

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І. І. Veretyannikov^1,2, F. А. Danevich¹, Yu. G. Zdesenko¹, V. V. Коbychev¹, S. S. Nagorny¹, D. V. Poda<sup>1,3

1</sup>Institute for Nuclear Research, National Academy of Sciences of Ukraine, Kyiv, Ukraine
²National Technical University of Ukraine "Kyiv Polytechnic Institute", Kyiv, Ukraine
³Kyiv Taras Shevchenko National University, Kyiv, Ukraine

Abstract: Improvement of the energy resolution of ¹¹⁶CdWO₄ scintillation spectrometer from 8% to 4% (FWHM, at the energy of ¹¹⁶Cd 2β-decay - 2.8 МеV) can reduce background by a factor of 3 - 4. It allows to improve sensitivity of the new experiment, which is developed in the Solotvina Underground Laboratory, up to the level of T_1/2 ≈ 10²⁵ years for 0ν2β-decay of ¹¹⁶Cd, which corresponds to the neutrino mass m_ν ≈ 0.2 eV. With the CdWO₄ crystal (⊘ 40 × 30 mm) located in a light-guide, 22% increase of light collection was obtained. Such an improvement of light collection for a scintillation detector with light-guide is reached for the first time. The energy resolution of 3.7% (at energy 2.8 МеV) can be obtained using two light-guides and off-line correction of light collection non-uniformity.

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