将下列段落翻译成中文 During the 1930s , Enrico Fermi and his co-workers in Italy performed a number of experiments with the newly discovered neutron. He reasoned correctly that the lack of charge on the neutron would make it particularly effective in penetrating a nucleus. Among his discoveries was the great affinity of slow neutrons for many elements and the variety of radioisotopes that could be produced by neutron capture. In 1936 , Breit and Wigner provided the theoretical explanation of slow neutron processes. Fermi made measurements of the distribution of both fast and thermal neutrons and explained the behavior in terms of elastic scattering, chemical binding effects, and thermal motion in the target molecules. Many cross sections for neutron reactions were measured during this period, including that of uranium, but the fission process was not identified.