Detailed Study of Alpha Emission inCf252Fission

Long-range $\alpha$-accompanied fission of ${}_{}{}^{252}{}_{}{}^{}\mathrm{Cf}$ is investigated in a five-parameter correlation experiment and the behavior of each component of total energy, including the prompt neutrons from the individual fragments, as well as from the fragment pairs and the prompt-$\gamma$ emission, is studied and compared with the binary fission. The problem of determining the nucleon contribution by binary fragments to the $\alpha$-particle formation is discussed. The average energy of the $\alpha$ particle is observed to increase towards the symmetric fission region, which is understood in terms of a possible shift of the scission point towards the heavy fragment. The dependence of the average number of total neutrons on the $\alpha$-particle energy and the dependence of the $\alpha$-particle energy on the fragment total kinetic energy is not linear, which is interpreted to yield some qualitative information on the initial energy of the $\alpha$ particle. Several differential correlations are also discussed.