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27 April 2024

» arxiv » 1109.6110

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Measurement of $etaeta$ Decay-Simulating Events in Nuclear Emulsion with Molybdenum Filling
V.D. Ashitkov ; A.S. Barabash ; V.Ya. Bradnova ; V.A. Ditlov ; V.V. Dubinina ; N.P. Egorenkova ; S.I. Konovalov ; E.A. Pozharova ; N.G. Polukhina ; V.A. Smirnitsky ; N.I. Starkov ; M.M. Chernyavsky ; T.V. Shchedrina ; V.I. Umatov ;
Date:	28 Sep 2011
Abstract:	The measurement of positron--nucleus collisions was used to estimate the possibility of suppressing background events that simulate $etaeta$ 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 $<d> = (0.60pm 0.03) ~mu$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 $etaeta$ decay background from electrons emerging in the decay of elements of naturally occurring radioactive chains. The background from $eta$ 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 $1.5cdot 10^{-2}$. 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.
Source:	arXiv, 1109.6110
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