A. V. Derbin, I. S. Drachnev, Yu. M. Gavrilyuk, A. M. Gangapshev, V. V. Kazalov, V. V. Kuz'minov, V. N. Muratova, D. A. Semenov, D. A. Tekueva, M. V. Trushin, E. V. Unzhakov, S. P. Yakimenko, “Search for inelastic scattering of dark matter particles on <nobr>$^{83}$</nobr>Kr nuclei with excitation of a low-lying nuclear level”, Pisma v Zhurnal Tekhnicheskoi Fiziki, 2025, Volume 51, Issue 24,Pages <nobr>4

International Conference on Physics.SPb/2025

Search for inelastic scattering of dark matter particles on $^{83}$Kr nuclei with excitation of a low-lying nuclear level

A. V. Derbin^a, I. S. Drachnev^a, Yu. M. Gavrilyuk^b, A. M. Gangapshev^b, V. V. Kazalov^b, V. V. Kuz'minov^b, V. N. Muratova^a, D. A. Semenov^a, D. A. Tekueva^b, M. V. Trushin^a, E. V. Unzhakov^a, S. P. Yakimenko^b

^a The Petersburg Nuclear Physics Institute, The National Research Center "Kurchatov Institute"
^b Institute for Nuclear Research, Russian Academy of Sciences, Moscow

Abstract: A search for excitation of the first nuclear level with an energy of 9.4 keV in the $^{83}$Kr nuclide by massive weakly interacting dark matter particles was performed with a gas proportional counter filled with the $^{83}$Kr isotope. The experiment was conducted in the Baksan Neutrino underground laboratory of the Institute for Nuclear Research of the Russian Academy of Sciences. As a result, a new upper limit on the nuclear level excitation cross section was established: for 20 GeV mass particles – $\sigma_0^{\mathrm{SD}}\le$ 3.4 $\times$ 10$^{-35}$ cm$^2$ at a 90% confidence level.

Keywords: dark matter, weakly interacting massive particles, WIMPS, inelastic scattering.

Received: 30.04.2025
Revised: 13.08.2025
Accepted: 14.08.2025

DOI: 10.61011/PJTF.2025.24.61746.7930