Ideal Gas Resonance Scattering Kernel Routine for the NJOY Code
- Technion-Israel Institute of Technology, Haifa (Isreal)
In a recent publication an expression for the temperature-dependent double-differential ideal gas scattering kernel is derived for the case of scattering cross sections that are energy dependent. Some tabulations and graphical representations of the characteristics of these kernels are presented in Ref. 2. They demonstrate the increased probability that neutron scattering by a heavy nuclide near one of its pronounced resonances will bring the neutron energy nearer to the resonance peak. This enhances upscattering, when a neutron with energy just below that of the resonance peak collides with such a nuclide. A routine for using the new kernel has now been introduced into the NJOY code. Here, its principal features are described, followed by comparisons between scattering data obtained by the new kernel, and the standard ideal gas kernel, when such comparisons are meaningful (i.e., for constant values of the scattering cross section a 0 K). The new ideal gas kernel for variable Σs0(E) at 0 K leads to the correct Doppler-broadened ΣsT(E) at temperature T.
- Research Organization:
- Technion-Israel Institute of Technology, Haifa (Isreal)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA), Nuclear Criticality Safety Program (NCSP)
- OSTI ID:
- 786464
- Journal Information:
- Transactions of the American Nuclear Society, Vol. 81; Conference: 1999 Winter Meeting , Long Beach, CA (United States), 14-18 Nov 1999; Other Information: Transactions of the American Nuclear Society, Vol. 81; PBD: 14 Nov 1999; ISSN 0003-018X
- Publisher:
- American Nuclear Society
- Country of Publication:
- United States
- Language:
- English
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