Partial Cross-Sections of $^{140}$Ce(n,2n)$^{139}$Ce Reaction

The excitation function for the $^{140}$Ce(n,2n)$^{139}$Ce reaction has been studied in the TUNL Shielded Neutron Source area. A pulsed and quasi-monoenergetic neutron beam was produced via the D(d,n) reaction ($\Delta$E/E=3-5\%) with energies of 12, 13.3, 14.5, and 16 MeV with a beam flux of $\sim$10$^{4}$ n/(s*cm)$^{2}$. The target consisted of a mixture of natural Ce and Fe. Two clover and two planar HPGe detectors were used to make in-beam measurements of the $\gamma$-ray cascade deexciting $^{139}$Ce. The partial cross sections were normalized to the 847 keV transition in $^{56}$Fe. Statistical model calculations using code EMPIRE will be compared with the present data as well as with the previously obtained [1] transition amplitudes for the $^{140}$Ce($\gamma$,n)$^{139}$Ce reaction. \\ $[1]$ C.T.Angell et al. CGS 12. Notre Dame, IN, 2005, p. 363.