arXiv subjects

K. A. Subbotin

Publications and source records attributed to K. A. Subbotin.

3 recordsLinked to original sources

arXiv2025

High-resolution luminescence spectroscopy of CaWO$_4$:Ho$^{3+}$: Sensitive detection of internal strains, temperature, and magnetic field

We carried out high-resolution (0.02 cm-1) measurements of the photoluminescence (PL) spectra of CaWO4:Ho3+, including in magnetic field, and performed spectra modeling. Well-resolved hyperfine structure was observed in the luminescence spectra of CaWO4:Ho3+ for the first time. Energies of several crystal-field levels were specified, g-factors were determined. Variations of a magnetic field as small as several tenths of mT can be detected from the PL spectra. We show that the PL spectra are much more sensitive to lattice strains in CaWO4:Ho3+ than the absorption spectra. The spectra were simulated using refined crystal-field parameters and taking into account both hyperfine and deformation interactions. Here, we used the previously obtained distribution function of random strains induced by point lattice defects in an elastically anisotropic CaWO4 crystal. A luminescence thermometer for temperatures around 20 K based on CaWO4:Ho3+ is suggested.

physics.optics↗

arXiv2020

New limits on the resonant absorption of solar axions obtained with a $^{169}$Tm-containing cryogenic detector

A search for resonant absorption of solar axions by $^{169}$Tm nuclei was carried out. A newly developed approach involving low-background cryogenic bolometer based on Tm$_3$Al$_5$O$_{12}$ crystal was used that allowed for significant improvement of sensitivity in comparison with previous $^{169}$Tm based experiments. The measurements performed with $8.18$ g crystal during $6.6$ days exposure yielded the following limits on axion couplings: $|g_{Aγ} (g_{AN}^0 + g_{AN}^3) \leq 1.44 \times 10^{-14}$ GeV$^{-1}$ and $|g_{Ae} (g_{AN}^0 + g_{AN}^3) \leq 2.81 \times 10^{-16}$.

hep-ex↗

arXiv2019

A Test of Bolometric Properties of Tm-containing Crystals as a Perspective Detector for the Solar Axion Search

The $^{169}$Tm nuclide has first nuclear level at 8.41 keV with magnetic type transition to the ground state and, therefore, can be used as a target nucleus for the search of resonant absorption of solar axions. We plan to use a Tm-containing crystal of a garnet family Tm$_3$Al$_5$O$_{12}$ as a bolometric detector in order to search for the excitation of the first nuclear level of $^{169}$Tm via the resonant absorption of solar axions. With this perspective in mind, a sample of the Tm$_3$Al$_5$O$_{12}$ crystal was grown and tested for its bolometric and optical properties. Measurements of chemical and/or radioactive contaminations were performed as well. In this paper we present the test results and estimate the requirements for a future low-background experimental setup.

physics.ins-det↗