Prompt Gamma Rays Accompanying the Spontaneous Fission ofCf252

Single- and multiple-crystal scintillation techniques are utilized to measure the energy spectrum of prompt gamma rays emitted in the spontaneous fission of ${\mathrm{Cf}}^{252}$. It is found that each fission yields an average of 10.3 photons having a total energy of 8.2 Mev. These photons are heterogeneous in energy. An upper limit is placed on the intensity of neutrons and quanta emitted in the order of ${10}^{-9\mathrm{}}$ second after fission.