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Ultracold neutrons (UCN) have very low kinetic energies 0-300 neV, therebycan be stored in specific material or magnetic confinements for many hundredsof seconds. This makes them a very useful tool in probing fundamentalsymmetries of nature (for instance charge-parity violation by neutron electricdipole moment experiments) and contributing important parameters for the BigBang nucleosynthesis (neutron lifetime measurements). Improved precisionexperiments are in construction at new and planned UCN sources around theworld. MC simulations play an important role in the optimization of suchsystems with a large number of parameters, but also in the estimation ofsystematic effects, in benchmarking of analysis codes, or as part of theanalysis. The MCUCN code written at PSI has been extensively used for theoptimization of the UCN source optics and in the optimization and analysis of(test) experiments within the nEDM project based at PSI. In this paper wepresent the main features of MCUCN and interesting benchmark and applicationexamples.

The MCUCN simulation code for ultracold neutron physics