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Mass distributions of fragments from fission of /sup 249/Cf, /sup 237/Np, and /sup 238/U by. cap alpha. particles

V. D. Dmitriev, Horst Sodan, A. M. Kalinin, Sergey M. Lukyanov, Yu.Ts. Oganesyan, Y.E. Penionzhkevich, T.S. Salamatina

Abstract

We report measurements of the mass distributions of fragments from fission of the nuclei /sup 237/Np, /sup 238/U, and /sup 249/Cf by /sup 4/He ions with energy 28 and 36 MeV. The measurements were made in a time-of-flight spectrometer with a mass resolution of 1.5%. The ratios of the symmetric and asymmetric components of the fragment mass distributions are analyzed. On the assumption that the shaping of the mass distributions occurs near the outer fission barrier, estimates are obtained for the difference in the barriers for symmetric and asymmetric fission.

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Key concepts: Fission, Nuclear physics, Physics, Fission products, Spontaneous fission, Mass distribution, Alpha particle, Atomic physics