Monte Carlo model of the experiment for neutron lifetime measurement

Monte Carlo model of the experiment for measuring the neutron lifetime by the method of storing ultracold neutrons in a material trap is developed. The trajectory of each neutron is calculated taking into account the gravity. In the model all stages of the experiment are fully reproduced. To accumulate the necessary statistics, the calculations were carried out on a computer cluster. As a result of the calculations, the calculated and experimental dependence of the detector count on the time was found to coincide and the systematic uncertainty associated with the method of calculating the effective collision frequency of ultracold neutrons in a trap was determined. The modeling of all the details of this experiment is extremely important to justify the accuracy achieved and to prove the absence of systematic errors.