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Separation of the Process e^+e^-→nn̅ by Means of time Measurements in the Caloriment

Physics of Atomic Nuclei(2021)

Budker Institute of Nuclear Physics

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Abstract
In the experiment with the SND detector at the VEPP-2000 e^+e^- collider, events of the process e^+e^-→ nn̅ were separated via measuring, in each counter of the multichannel calorimeter based on 1640 NaI(Tl) crystals, the time of delay of the signal from nonrelativistic antineutrons. The time resolution for events of the process e^+e^-→γγ was 0.8 ns. The measured time spectrum of delays of the signal from antineutrons in the calorimeter at the c.m. energy of 1902 MeV agrees with the results of calculations.
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