  Neutrons can induce background events in underground experiments looking for
rare processes. Neutrons in a MeV range are produced in radioactive decays via
spontaneous fission and (alpha, n) reactions, and by cosmic rays. Neutron
fluxes from radioactivity dominate at large depths (>1 km w. e.). A number of
computer codes are available to calculate cross-sections of (alpha, n)
reactions, excitation functions and neutron yields. We have used
EMPIRE2.19/3.2.3 and TALYS1.9 to calculate neutron production cross-sections
and branching ratios for transitions to the ground and excited states, and
modified SOURCES4A to evaluate neutron yields and spectra in different
materials relevant to high-sensitivity underground experiments. We report here
a comparison of different models and codes with experimental data, to estimate
the accuracy of these calculations.
