3. DESCRIPTION
Efforts devoted to developing or improving thermal scattering data (S(alpha,beta)) for very cold and cryogenic temperatures have recently been carried out. Here several evaluations carried out at the Institut fur Kernenergetik und und Energiesysteme (IKE), University of Stuttgart are made available. They are listed in the following Table.
Liquid hydrogen and deuterium for the two modifications: ortho and para
Material MAT* Temperatures (K) ID ACE* files
para Hydrogen 2 14, 16 and 20.38 pH.00t, pH.01t, pH.03t
ortho Hydrogen 3 14, 16 and 20.38 oH.00t, oH.01t, oH.03t
para Deuterium 12 19 and 23.65 pD.00t, pD.01t
ortho Deuterium 13 19 and 23.65 oD.00t, oD.01t
H in polyethylene (CH2)
Material MAT Temperatures (K) ID ACE files
H in CH2 37 87, 293.6 and 350 poly.01t, poly.03t, poly.04t
poly.11t, poly.13t, poly.14t
Liquid argon
Material MAT Temperature (K) ID ACE file
18-Ar 18 87 argon.01t, argon.11t
Aluminium face centred cubic lattice
Material MAT Temperatures (K) ID ACE files
13-Al-27 61 20, 77, 87, 100, 293.6, 400 al.00t,al.01t,al.02t,al.03t,
al.04t,al.05t,
al.10t,al.11t,al.12t,al.13t,
al.14t,al.15t
* MAT numbers for the ENDF files and ID's for ACE (MCNP continuous energy data libraries)
The datasets are provided in the standard ENDF-6 format and in the ACE format, used for continuous energy Monte Carlo applications. Cross section libraries can be produced also for deterministic approaches through the use of the NJOY computer code. It should be noted that for very cold temperatures special care must be taken in processing the data and occasionally patches need to be applied to the processing code.