In September, Fermi assembled his first nuclear "pile" or reactor, in an attempt to create a slow neutron-induced chain reaction in uranium, but the experiment failed to achieve criticality, due to lack of proper materials, or not enough of the proper materials which were available.
I september samlede Fermi den første kerne "stak" eller reaktor, i et forsøg på at skabe neutron induceret kædereaktion med langsomme neutroner, men forsøget fejlede at opnå kritikalitet grundet manglende masse eller renhed af de tilgængelige materialer.