MATJEFF31.BOLIB /1/ is a multi-group coupled (199 neutron groups + 42 photon groups) pseudo-problem-independent cross section library in MATXS format for nuclear fission applications. MATJEFF31.BOLIB is based on the JEFF-3.1 /2/ OECD/NEA Data Bank evaluated nuclear data library and it was processed, through the NJOY-99 /3/ system, in the VITAMIN-B6 /4/ library group structure using the same calculation methodology.
Since the data processing of MATJEFF31.BOLIB was performed before the release of the JEFF-3.1.1 /5/ evaluated nuclear data library, at the end of February 2009, an additional separated set of JEFF-3.1.1 processed data files was recently included for the following 12 nuclides, obtained for consistency with the same NJOY version previously used: O-16, Cl-35, Ca-46, Cr-52, Fe-56, Zr-91, Zr-96, Mo-95, Eu-154, U-233, Np-237 and Pu-239. Concerning this additional set of JEFF-3.1.1 data files, it was decided to reprocess only the nuclides already inserted in the list of processed files for MATJEFF31.BOLIB whose evaluations were updated or corrected in the JEFF-3.1.1 library. MATJEFF31.BOLIB was extensively tested on many thermal, intermediate and fast neutron spectrum criticality safety benchmark experiments.
ORIGINAL NUCLEAR DATA FILE: JEFF-3.1 + JEFF-3.1.1
DATA PROCESSING SYSTEMS: NJOY-99.160(GROUPR module modified by ENEA-Bologna)
NUMBER OF GROUPS: 199 neutron groups and 42 photon groups
THERMAL NEUTRON GROUPS: 36 groups below 5.043 eV with upscatter cross sections
NEUTRON ENERGY RANGE: 1.0E-5 eV - 19.64 MeV
PHOTON ENERGY RANGE: 1.0 keV - 30.0 MeV
TEMPERATURES [K]: 300, 600, 1000, and 2100 (same values as in VITAMIN-B6)
BACKGROUND CROSS SECTIONS (SIGMA-ZEROs) [barns]:
1, 10, 50, 100, 300, 1.0E+3, 1.0E+4,1.0E+5, 1.0E+6, 1.0E+10 (infinite dilution)
(same values as in VITAMIN-B6)
LEGENDRE ORDER: P7 for materials with Z < /= 29 (copper); P5 for the remainders
NUMBER OF MATERIALS: 182 nuclides
MATERIALS INCLUDED: one file per material (nat=natural):
H-H2O H-CH2 H-ZrH D-D2O H-3 He-3 He-4 Li-6
Li-7 Be-9 Be-TH B-10 B-11 C-nat C-GPH N-14
N-15 O-16 O-17 F-19 Na-23 Mg-24 Mg-25 Mg-26
Al-27 Si-28 Si-29 Si-30 P-31 S-32 S-33 S-34
S-36 Cl-35 Cl-37 K-39 K-40 K-41 Ca-40 Ca-42
Ca-43 Ca-44 Ca-46 Ca-48 Ti-46 Ti-47 Ti-48 Ti-49
Ti-50 V-nat 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 Ga-nat Y-89 Zr-90 Zr-91 Zr-92
Zr-94 Zr-96 Nb-93 Mo-92 Mo-94 Mo-95 Mo-96 Mo-97
Mo-98 Mo-100 Ag-107 Ag-109 Cd-106 Cd-108 Cd-110 Cd-111
Cd-112 Cd-113 Cd-114 Cd-115m Cd-116 In-113 In-115 Sn-112
Sn-114 Sn-115 Sn-116 Sn-117 Sn-118 Sn-119 Sn-120 Sn-122
Sn-123 Sn-124 Sn-125 Sn-126 Ba-138 Eu-151 Eu-152 Eu-153
Eu-154 Eu-155 Gd-152 Gd-154 Gd-155 Gd-156 Gd-157 Gd-158
Gd-160 Er-162 Er-164 Er-166 Er-167 Er-168 Er-170 Hf-174
Hf-176 Hf-177 Hf-178 Hf-179 Hf-180 Ta-181 Ta-182 W-182
W-183 W-184 W-186 Re-185 Re-187 Au-197 Pb-204 Pb-206
Pb-207 Pb-208 Bi-209 Th-230 Th-232 Pa-231 Pa-233 U-232
U-233 U-234 U-235 U-236 U-237 U-238 Np-237 Np-238
Np-239 Pu-236 Pu-237 Pu-238 Pu-239 Pu-240 Pu-241 Pu-242
Pu-243 Pu-244 Am-241 Am-242 Am-242m Am-243 Cm-241 Cm-242
Cm-243 Cm-244 Cm-245 Cm-246 Cm-247 Cm-248
NEUTRON WEIGHTING SPECTRUM:
Corresponding to the IWT=4 input option in the GROUPR module of NJOY:
from 1.0E-5 eV to 0.125 eV -> Maxwellian thermal spectrum (kT = 0.025 eV)
from 0.125 eV to 820.8 keV -> '1/E' slowing-down spectrum
from 820.8 keV to 19.64 MeV -> fission spectrum (fission temperature = 1.273 MeV)
PHOTON WEIGHTING SPECTRUM:
Corresponding to the IWT=3 input option in the GAMINR module of NJOY:
'1/E' spectrum with a 'roll-off' at lower energies to represent photoelectric absorption and a similar 'drop-off' at higher energies corresponding to the Q-value for neutron capture.
The total (prompt + delayed) neutron fission spectra for U-235, U-238 and Pu-239 are included in tabulated form in the package together with the neutron and photon group energy boundaries, the neutron and photon group lethargy boundaries and the neutron and photon group lethargy widths.
The neutron and photon energy weighting spectra in group representation are also included in the package.
Detector response functions are at present not included in the library package.