STUDY OF 249Cf(nth,f) WITH LOHENGRIN MASS SEPARATOR

STUDY OF ²⁴⁹Cf(n_th,f) WITH LOHENGRIN MASS SEPARATOR

M. Djebara¹, M. Asghar¹, J.P. Bocquet², R. Brissot³, J. Crançon³, Ch. Ristori³, E. Aker³, D. Engelhardt⁴, B.D. Wilkins⁵ and U. Quade⁶

¹ I. Ph. USTHB, B.P. 32, El Alia, Alger, Algérie
² ILL, 156X, 38042 Grenoble, France
³ CEN-DRF/SPH/PhAN, 85X, 38041 Grenoble, France
⁴ T.U.K., 7500 Karlsruhe, West Germany
⁵ A.N.L., Argonne, Illinois 60439, USA
⁶ University of Munich, West Germany

The ILL-Grenoble mass separator Lohengrin was used to measure the yields of light fission products from ²⁴⁹Cf(n_th,f) as a function of A, Z, the kinetic energy and the ionic charge states. The mass range covered, for E_Loh=87 to 112 MeV, was A_L = 89 to 120. The charge polarisation ΔZ(A_L) = Z - Z_UCD was deduced. The proton and neutron odd-even effects were found to be δ_p = (4.6 + 0.7)% and δ_n = (9.5 + 0.7)%. The odd-even effects on mean proton and neutron total kinetic energy are δE_k^0-e(p) = (0.20 + 0.07) MeV and δE_k^0-e(n) = (0.48 + 0.16) MeV. The mean value of isobaric variance <σ_z²> = (0.43 + 0.03). These results and the different distributions are compared with the existing data on the other fissioning nuclei.