<prompt> Pashure pehondo, Leona Marshall akadzokera kuYunivhesiti yeChicago, kwaakava mushandi paFermis Institute for Nuclear Studies. Kushanda neChicago Pile 3 heavy water reactor, akawana nzira yekugadzira 100 muzana spin polarize neutron beams, uye akaona refractive index ye neutron yezvinhu zvakasiyana-siyana. Mwana wake wechipiri, John Marshall III, akaberekwa muna 1949. Akava mutevedzeri purofesa muna 1953. Mushure mekufa kwaFermi muna 1954, vaMarshall vakaparadzana.  <response>: John Marshall III 