3. DESCRIPTION OF PROGRAM OR FUNCTION
VITENEA-E is a coupled 174-neutron, 38-gamma-ray multigroup cross sections library in AMPX format suitable for multidimensional radiation transport calculations and dose evaluation. To produce that library, the file ENDF/B-VI has been chosen as primary source of basic nuclear data because it is suitable for processing using the NJOY-SMILER-SCALE sequence. That file is adequate for fusion calculations since it allows important features, like:
- data for angle-energy correlation of high energy neutrons, charged particles and recoil nuclei;
- separate isotopic evaluations for the main structural materials;
- photon production data for the main structural materials.
The neutron weighting function is taken from Vitamin-E. It has the form:
- Maxwellian thermal spectrum (from 10-5 to 0.414 eV),
- 1/E slowing down region (from 0.414 eV to 2.1225 MeV),
- fission spectrum (from 2.1225 to 10 MeV),
- 1/E (from 10 to 12.52 MeV),
- DT fusion neutron spectrum (from 12.52 to 15.68 MeV)
- 1/E (from 15.68 to 19.64 MeV).
The photon weighting spectrum is assumed to be constant both for production from neutron reactions and for interactions among photons only. The scattering Legendre expansion order is assumed to be 8, both for the neutron and the photon interactions.The library is based upon the Bondarenko method for the resonance self-shielding and the temperature effects. The materials were processed at 293.6, 900, 2100 K. Ten values of the background cross sections are considered: 10+10, 1000, 300, 100, 30, 10, 3, 1, 0.1, 10-6.
The basic nuclear data (ENDF-B/VI) related to the following materials have been processed and included into VITENEA-E:
H (free gas), H (water), H-3, He-4, Li-6, Li-7, Be-9 (metallic), Be-9 (BeO), C (free gas), C (graphite), O, Al-27, Si,, Ti, Cr-50, Cr-52, Cr-53, Cr-54, Mn-55, Fe-54, Fe-56, Fe-57, Fe-58, Co-59, Ni-58, Ni-60, Ni-61, Ni-62, Ni-64, Cu-63, Cu-65, Mo, Wnat, W-182, W183, W184, W186, Hf-176, Hf-177, Hf-178, Hf-179, Hf-180,Re-187.
Additional materials have been included into the Vitamin-ENEA by taking their multigroup cross sections directly from the Vitamin-E library .
H2, Li-6, Li-7, B-10, B-11, N-14, Na-23, Mg, P-31, S, Cl,, K, Ca, V, Zr, Nb-93, Cd,, Sn, Gd, Ta-181, Pb, Bi-209, Th-232, U-235, U-238, Al-27, F-19, Ar, Ga, Pt, Fe, Cr, Ni, Cu. (Materials appearing twice are taken from different evaluations - ENDF/B-V and ENDF/B-VI - or processed by different computer codes - NJOY and MINX).