Measurement of the energy spectrum of electrons formed after the muonium decay in a nuclear photoemulsion

Abstract During the decay (μ + → e + ) at the end of the muon tracks in nuclear photoemulsion, in addition to the tracks of positrons, electron tracks were observed. The distributions of electrons over residual ranges and over energies were found. Both distributions were fitted with Gaussian functions and it was shown that each of them consists of two peaks. Then both peaks of the electron energy distribution were described by Gaussian functions with parameters calculated using the SRIM2013 code without any fittings. It was found that electrons knocked out of bromine atoms formed the largest peak, and electrons knocked out of silver atoms formed the second peak. Several hypotheses about the appearance of electrons were considered, but the reason for their appearance has not yet been explained.