NEW RESULTS OF ABSOLUTE CROSS-SECTION MEASUREMENTS FOR THE HEAVY NUCLIDE FISSION INDUCED BY FAST NEUTRONS

I.D. Alkhazov, L.V. Drapchinsky, V.A. Kalinin, S.S. Kovalenko, O.I. Kostochkin, V.N. Kuzmin, L.M. Solin, V.I. Shpakov

V.G. Khlopin Radium Institute
Roentgen str.1, Leningrad P-22, USSR

K. Merla, G. Musiol, G. Pausch, U. Todt, K.-M. Herbach

Technical University Dresden
Mommsen str. 13, 8027 Dresden, GDR

Absolute measurements of the ²³⁸U fission cross section at the neutron energy of 5.0 MeV have been carried out using the TCAP-technique.

The results of the ²³⁵U fission cross section absolute measurements obtained earlier have been revised on the basis of both experimental measurements of the fission fragment detection efficiency and more precise determination of the fission foil areal densities as well as their nonuniformities.

KEYWORDS: fission cross section, ²³⁵U, ²³⁸U, TCAP-method, fission fragment registration efficiency, fast neutrons fission