V. Ya. Bradnova | Searcharxiv

arXiv2012

Determination of the accuracy of measuring the energy of charged particles by their path lengths in nuclear emulsion

The path lengths of monochromatic muons emerging in the $π\to μν_μ $ decay were measured by the coordinate method with the view to determine their energy by path length. The dispersion of muon energy measurements by this method was $ σ_μ = (0.11 \pm 0.01)$ MeV, which corresponds to the accuracy of $ σ\approx 2.7%$ of the energy of a charged particle estimated by its path length in nuclear emulsion. The developed method will enable measurements of electron energies in $2β$ decay ($\sim 3$ MeV) to an accuracy of $ σ\approx 5%$.

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arXiv2011

Measurement of $ββ$ Decay-Simulating Events in Nuclear Emulsion with Molybdenum Filling

The measurement of positron--nucleus collisions was used to estimate the possibility of suppressing background events that simulate $ββ$ decay in the emulsion region adjacent to molybdenum conglomerates. The range of the escape of two relativistic particles from the interaction was found to be $ = (0.60\pm 0.03) ~μ$m, which approximately corresponds to the grain size of developed nuclear emulsion. No correlation of the values of d with the angle between two relativistic particles was observed. It was shown that it was possible to exclude $ββ$ decay background from electrons emerging in the decay of elements of naturally occurring radioactive chains. The background from $β$ decays of $^{90}$Sr and $^{40}$K available in emulsion around Mo conglomerates was determined by the ratio of the volume $(\sim d^3)$ to the total volume of emulsion and was found to be $1.5\cdot 10^{-2}$. It was shown that the backgrounds from $^{40}$K, $^{90}$Sr and natural radioactivity could be significantly suppressed and would not limit the sensitivity of the experiment with 1 kg $^{100}$Mo.

nucl-ex↗

arXiv2010

Nuclear emulsion with molybdenum filling for observation of $ββ$ decay

The usage of nuclear emulsion with molybdenum filling for observation of $ββ$ decay are shown to be possible. Estimates for 1 kg of $^{100}$Mo with zero background give the sensitivity for the $0νββ$ decay of $^{100}$Mo at the level of $\sim 1.5\cdot 10^{24}$ y for 1 year of measurement.

nucl-ex↗