238U fission induced by low-energy monochromatic γ-rays

MEASUREMENT OF PHOTOFISSION CROSS-SECTION OF238UUSING MICROTRON FACILITY

“…Hence, the photon spectrum was measured directly and was unfolded from the yield curves to obtain the cross-sections. Figures 9 and 10 show the data of Manfrenidi et al, 23 Mafra et al 24 who employed the same method as Khan and Knowles 22 and Fig. 11 shows data of Andrel et al, 25 Caldwell et al 26 who employed neutron-capture γ-rays as the photon source.…”

Photofission cross sections of 238U and 235U from 5.0 MeV to 8.0 MeV

“…Bremsstrahlung has been used by several experimenters (6,7,8,9,10,11) In measurements of activation functions (6,7,8) and yield curves (9,10,1T) from which the cross sections were extracted by differential analysis. Discrete gamma rays, produced by neutron capture In suitable targets, have been used to measure values of the U cross section by other experimenters (12,13,14). Khan Clearly, a need exists for more reliable photofission cross section measurements to determine the energies and widths of the transition states 2^8 in the fissioning U nucleus.…”

Photofission cross sections of 238U and 235U from 5.0 MeV to 8.0 MeV

“…Bremsstrahlung has been used by several experimenters (6,7,8,9,10,11) In measurements of activation functions (6,7,8) and yield curves (9,10,1T) from which the cross sections were extracted by differential analysis. Discrete gamma rays, produced by neutron capture In suitable targets, have been used to measure values of the U cross section by other experimenters (12,13,14). Khan and Knowles (15) used Compton scattered gamma rays In their photofission yield measurements, from which the cross section was obtained by an unfolding procedure.…”