SYSTEMATICS OF AVERAGE NEUTRON CAPTURE CROSS SECTIONS AROUND 25 keV

Zhao Zhixiang, Zhou Delin and Cai Dunjiu

Institute of Atomic Energy
P.O. Box 275 (41), Beijing, China

The systematic behavior of average neutron capture cross sections around 25 keV has been studied. These cross sections demonstrate the shell effect clearly. A simplified and parameterized formula of
σ_nγ = ClA^C2U^C3a^C4exp (C5√aU)
was used to fit the measured data by the least squares method and the five parameters were obtained.

KEYWORDS: systematics, neutron capture cross sections, shell effect