Simultaneous emission of two light charged particles in spontaneous fission of $sup 252$Cf

The emission of two light charged particles in the spontaneous fission 252 of Cf has been observed and studied.Two particle telescopes were placed 252 on the opposite sides of a strong Cf source covered on both sides by platinum foils« The coincidences between the two telescopes were mainly of the type He -He although He -"B events were also observed.The energy spectra of the detected particles-alphas and tritons, are similar in shape to the spectra of normal long range particles, hut the mean energies are k k lower by about 2 MeV.The mean energy of one alpha particle in the He -He coincidences does not change as a function of the energy of the other particle.The angular correlation between these particles has also been measured in another experiment (at five angles 180°, 90°, 66°, l»5°, 35°) without particle Identification.The overall emission rate of the eolncidnt particles is approximately two per million binary fission events.The hypothesis of Work performed under the auspices of the U. S. Atomic Energy Commission.