Speaker
Mr
Artem Amirkhanov
(BINP)
Description
Identification technique of the $e^+e^-\rightarrow n\bar{n}$ events is described.
Neutron passing through the detector systems does not interact with the calorimeter and can not be registered. Antineutron annihilates in the calorimeter and as a result of the interaction a number of new particles are born, which can be registered. Near the production threshold antineutrons have a relatively low velocities and correspondingly a long time of flight through the detector. The average times of annihilation in the calorimeters have a typical delay time about 4–11 ns with respect to the beam collision, which can be used for the identification of the $e^+e^-\rightarrow n\bar{n}$ events.
The main background events in this case are cosmic events which comes at random times, and its number is $10^4$ times more than $n\bar{n}$ events. The described technique of identification $n\bar{n}$ events is using main detector systems and neural network to reduce the background of cosmic events.
Primary author
Mr
Artem Amirkhanov
(BINP)
