Simulation of Experiment on Measurement of Neutron Lifetime Using the Big Gravitational Trap of Ultracold Neutrons with the Absorber

At present, the experiment on measuring neutron lifetime using a big gravitational trap is being performed at Petersburg Nuclear Physics Institute. It is planned to achieve a measurement precision of 0.2 s, which is four times better than the best existing level of precision. The modified installation is simulated using the Monte Carlo method. It has been shown that the application of the absorber in the installation design increases the number of stored ultracold neutrons in the trap by a factor of approximately three and reduces the duration of the measurement cycle.