Emission of Particles of3<~Z<~8in the Fission ofCf252

The energy spectra and yields of particles of $3<~Z<~8$ emitted in the spontaneous fission of ${\mathrm{Cf}}^{252}$ were measured. The experiment was carried out using a particle telescope consisting of two $\frac{\mathrm{dE}}{\mathrm{dx}}$ gas-filled proportional counters and a solid-state $E$ counter. The cutoff energies were relatively low since essentially no absorber foil was placed between source and detector. The yields per ${10}^3$ fission $\alpha$ particles are: Li, 2.9 ± 0.5; Be, 6.5 ± 0.7; B, 0.35 ± 0.10; C, 4.3 ± 0.9; N, ≥ 0.66 ± 0.15; O, ≥ 0.05 ± 0.01. Trajectory calculations were carried out for Li, Be, and C, and the initial conditions which give best agreement with the experimental results were obtained.