Muna 1941, Hondo Yenyika II ichitsviriridza muEurope asi United States isati yasvika muhondo, Feynman akapedza zhizha achishanda pamatambudziko ebhalistiki paFrankford Arsenal muPennsylvania. Mushure mekurwiswa kwePearl Harbor kwakange kwaunza United States kuhondo, Feynman akaunganidzwa naRobert R. Wilson, uyo aishanda nenzira dzekugadzira uranium yakapfumiswa kuti ishandiswe mubhomba reatomu, sechikamu chezvaizova Manhattan Project. Chikwata chaWilson kuPrinceton chakanga chiri kushanda pachigadzirwa chinonzi isotron, chakanangana nekuparadzanisa electromagnetically uranium-235 kubva kuuranium-238. Izvi zvakaitwa nenzira yakasiyana zvachose neyakashandiswa necalutron iyo yakanga ichivandudzwa nechikwata pasi pemudzidzisi waWilson wekare, Ernest O. Lawrence, kuRadiation Laboratory yeCalifornia.
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