Spectra

The collapsed cross-sections, reaction rates depend strongly on the nature of the projectile spectra, and so it is important to use the appropriate spectrum together with the appropriately-weighted cross-section data. With the advances of modern simulation software and high-resolution spectra the user is reminded of the importance of the tails, low or high-energy ones, on the reaction rates.

The majority of neutron-application spectra stem from light-water assemblies, mock-ups, piles or reactors where the integral responses are strongly, if not solely, influenced by the energy ranges of the fission spectra, resonance range and thermal Maxwellian. Fusion spectra that have been obtained from magnetic confinement (MCF) or inertial confinement fusion (ICF) present typical D-D 2.5 MeV, or D-T 14 MeV peaks sometimes accompanied by a higher-energy tail, but also showing rather different slowing-down profiles. Accelerator-driven beam spectra are important in their role in nuclear data acquisition and materials research, but also for medical therapeutic and diagnostic applications.

In essence, the particle spectrum profile, through the collapsing process, emphasises the energy region of most importance for the application. Transferring data from one application or energy range to another should be done with great care as it can easily lead to misleading and inappropriate numerical results.

Several incident particle spectra are provided in the table below, mostly including neutron incident spectra but with some charged particle spectra. Note that these are provided in the original energy group structures as generated by the code(s) that calculated them. These are often not the same energy group structures as those provided for the nuclear data libraries and may require a flux conversion. Note that while the group conversion can easily be performed, this cannot add structure when moving from a coarse group structure to a more refined multi-group.

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Order Name Group Particle arb_flux.txt figure.png Description
1 acrr-cdpoly-640 640 n ACRR-CdPoly
ACRR-CdPoly SNL MCNP
2 acrr-ff-cc-32cl-640 640 n ACRR-FF-CC-32Cl
ACRR-FF-CC-32Cl SNL MCNP
3 acrr-lb44-640 640 n ACRR-LB44
ACRR-LB44 SNL MCNP
4 acrr-plg-640 640 n ACRR-PLG
ACRR-PLG SNL MCNP
5 fbr-6in-leakage-640 640 n FBR-6in-leakage
FBR-6in-leakage SNL MCNP
6 frec-ii-ff-640 640 n FREC-II-FF
FREC-II-FF SNL MCNP
7 spr-iii-cc-640 640 n SPR-III-CC
SPR-III-CC SNL MCNP
8 lr0-void-640 640 n LR-0-Void
LR-0-Void Rez MCNP
9 lr0-naf-640 640 n LR-0-NaF
LR-0-NaF Rez MCNP
10 lr0-as2o3-640 640 n LR-0-As2O3
LR-0-As2O3 Rez MCNP
11 lr0-y203-640 640 n LR-0-Y2O3
LR-0-Y2O3 Rez MCNP
12 lr0-zr02-640 640 n LR-0-ZrO2
LR-0-ZrO2 Rez MCNP
13 lr0-mn02-640 640 n LR-0-MnO2
LR-0-MnO2 Rez MCNP
14 lr0-nai-640 640 n LR-0-NaI
LR-0-NaI Rez MCNP
15 murrg1-112 112 n MURR-G1
MURR-G1 EXFOR xxxxx
16 baec-31733-triga-79 79 n TRIGA
TRIGA EXFOR 31733
17 hbr2-47 47 n HBR-2-RPV
HBR-2-RPV ORNL/TM-13204
18 owr-69 69 n LANL-OWR
LANL-OWR LANL Omega West
19 br2-621 621 n SCK-BR2
SCK-BR2 SCK-CEN BR2 MCNP
20 ebr2-29 29 n EBR-2
EBR-2 ANL West
21 bor60-42 42 n BOR-60c
BOR-60c Rosatom
22 bor60-69 69 n BOR-60b
BOR-60b Rosatom
23 bor60-176 176 n BOR-60a
BOR-60a Rosatom
24 bwr-rpv-198 198 n BWR-RPV
BWR-RPV EPRI NP-152
25 pwr-rpv-198 198 n PWR-RPV
PWR-RPV EPRI NP-152
26 cf-fis-70 70 n Cf252
Cf252 PTB
27 bigten-407 407 n Bigten
Bigten CEA TRIPOLI
28 hfir-100 100 n HFIR-lowres
HFIR-lowres ORNL
29 hfir-238 238 n HFIR-highres
HFIR-highres ORNL
30 hfir-vxf3-ad-238 238 n HFIR-VXF3-AD
HFIR-VXF3-AD ORNL MCNP
31 hfr-high-616 616 n HFR-high
HFR-high NRG MCNP
32 hfr-low-616 616 n HFR-low
HFR-low NRG MCNP
33 hfr-c3-171 171 n HFR-C3
HFR-C3 NRG MCNP
34 hfr-c7-171 171 n HFR-C7
HFR-C7 NRG MCNP
35 ifmif-dli-211 211 n IFMIF-DLi
IFMIF-DLi KFK
36 pli-22850-1903-94 94 n Tokyo-90KeV
Tokyo-90KeV EXFOR 22850
37 pli-22850-2000-150 150 n Tokyo-190KeV
Tokyo-190KeV EXFOR 22850
38 pli-22850-2100-145 145 n Tokyo-330KeV
Tokyo-330KeV EXFOR 22850
39 pli-22850-2300-275 275 n Tokyo-540KeV
Tokyo-540KeV EXFOR 22850
40 paluel-172 172 n Paluel
Paluel Framatome APOLLO2
41 pwr_mox_0 1102 n PWR-MOX-0
PWR-MOX-0 NDS-139(2017)1-76
42 pwr_mox_15 1102 n PWR-MOX-15
PWR-MOX-15 NDS-139(2017)1-76
43 pwr_mox_40 1102 n PWR-MOX-40
PWR-MOX-40 NDS-139(2017)1-76
44 pwr_uo2_0 1102 n PWR-UO2-0
PWR-UO2-0 NDS-139(2017)1-76
45 pwr_uo2_15 1102 n PWR-UO2-15
PWR-UO2-15 NDS-139(2017)1-76
46 pwr_uo2_40 1102 n PWR-UO2-40
PWR-UO2-40 NDS-139(2017)1-76
47 pwr_uo2_gd_0 1102 n PWR-UO2-Gd-0
PWR-UO2-Gd-0 NDS-139(2017)1-76
48 pwr_uo2_gd_15 1102 n PWR-UO2-Gd-15
PWR-UO2-Gd-15 NDS-139(2017)1-76
49 pwr_uo2_gd_40 1102 n PWR-UO2-Gd-40
PWR-UO2-Gd-40 NDS-139(2017)1-76
50 bwr_mox_gd_0 1102 n BWR-MOX-Gd-0
BWR-MOX-Gd-0 NDS-139(2017)1-76
51 bwr_mox_gd_15 1102 n BWR-MOX-Gd-15
BWR-MOX-Gd-15 NDS-139(2017)1-76
52 bwr_mox_gd_40 1102 n BWR-MOX-Gd-40
BWR-MOX-Gd-40 NDS-139(2017)1-76
53 bwr_uo2_gd_0 1102 n BWR-UO2-Gd-0
BWR-UO2-Gd-0 NDS-139(2017)1-76
54 bwr_uo2_gd_15 1102 n BWR-UO2-Gd-15
BWR-UO2-Gd-15 NDS-139(2017)1-76
55 bwr_uo2_gd_40 1102 n BWR-UO2-Gd-40
BWR-UO2-Gd-40 NDS-139(2017)1-76
56 phenix-172 172 n Phenix
Phenix CEA ERANOS
57 superphenix-172 172 n Superphenix
Superphenix CEA ERANOS
58 jaea-23075-fbr-107 107 n Yayoi
Yayoi EXFOR 23075
59 yayoi-glory-107 107 n YAYOI-Glory
YAYOI-Glory JAEA JNST
60 yayoi-grazing-107 107 n YAYOI-Grazing
YAYOI-Grazing JAEA JNST
61 irt-m-1000 1000 n IRT-M
IRT-M NRI Baghdad
62 fng_Cr-175 175 n FNG-Cr
FNG-Cr ENEA FNG
63 fng_cucrzr-175 175 n FNG-CuCrZr
FNG-CuCrZr ENEA FNG
64 fng_Dy-175 175 n FNG-Dy
FNG-Dy ENEA FNG
65 fng_eurofer-175 175 n FNG-eurofer
FNG-eurofer ENEA FNG
66 fng_f82h-175 175 n FNG-f82h
FNG-f82h ENEA FNG
67 fng_hafnium-175 175 n FNG-hafnium
FNG-hafnium ENEA FNG
68 fng_heat-175 175 n FNG-heat
FNG-heat ENEA FNG
69 fng_Mo-211 211 n FNG-Mo
FNG-Mo ENEA FNG
70 fng_Re-175 175 n FNG-Re
FNG-Re ENEA FNG
71 fng_ScSmGd-175 175 n FNG-ScSmGd
FNG-ScSmGd ENEA FNG
72 fng_SiC-175 175 n FNG-SiC
FNG-SiC ENEA FNG
73 fng_Sn-175 175 n FNG-Sn
FNG-Sn ENEA FNG
74 fng_Ta-175 175 n FNG-Ta
FNG-Ta ENEA FNG
75 fng_tung-175 175 n FNG-tung
FNG-tung ENEA FNG
76 fng_vanad-175 175 n FNG-vanad
FNG-vanad ENEA FNG
77 fng_Y-175 175 n FNG-Y
FNG-Y ENEA FNG
78 fzk_1-175 175 n FZK-1
FZK-1 FZK
79 fzk_2-175 175 n FZK-2
FZK-2 FZK
80 fzk_ss316-211 211 n FZK-ss316
FZK-ss316 FZK
81 rez_DF-211 211 n REZ-DF
REZ-DF REZ
82 sneg_1-9 9 n SNEG-1
SNEG-1 SNEG
83 sneg_2-6 6 n SNEG-2
SNEG-2 SNEG
84 tud_cucrzr-175 175 n TUD-CuCrZr
TUD-CuCrZr TUD
85 tud_Er-175 175 n TUD-Er
TUD-Er TUD
86 tud_Pb-175 175 n TUD-Pb
TUD-Pb TUD
87 tud_Ta-175 175 n TUD-Ta
TUD-Ta TUD
88 tud_Y-175 175 n TUD-Y
TUD-Y TUD
89 d-Be-211 211 n D-Be
D-Be UKAEA
90 d-Be2a-211 211 n D-Be2a
D-Be2a UKAEA
91 d-Be3-211 211 n D-Be3
D-Be3 UKAEA
92 fng-175 175 n Frascati-NG
Frascati-NG ENEA
93 tud-175 175 n TUD-NG
TUD-NG TUD
94 fns-new3t5-175 175 n JAEA-FNS-pos3
JAEA-FNS-pos3 JAEA MCNP
95 fns-pos1t5-175 175 n JAEA-FNS-pos1
JAEA-FNS-pos1 JAEA MCNP
96 fns-pos2t5-175 175 n JAEA-FNS-pos2
JAEA-FNS-pos2 JAEA MCNP
97 fns-pos7t7-175 175 n JAEA-FNS-pos7
JAEA-FNS-pos7 JAEA MCNP
98 jet-fw-100 100 n JET-FW
JET-FW UKAEA McBend
99 iter-dd-175 175 n ITER-DD
ITER-DD UKAEA
100 iter-dt-175 175 n ITER-DT
ITER-DT UKAEA
101 nif-ign-150 150 n NIF-ignition
NIF-ignition MIT
102 lmj-g-161 161 γ LMJ-g
LMJ-g CEA
103 hcpbdemo2015_FW_5521.617 616 n DEMO-HCPB-FW
DEMO-HCPB-FW UKAEA
104 hcpbdemo2015_VV_195.617 616 n DEMO-HCPB-VV
DEMO-HCPB-VV UKAEA
105 hcpbdemo2015_blbp_516.617 616 n DEMO-HCPB-BP
DEMO-HCPB-BP UKAEA
106 wcll_ht.617 616 n WCLL-FW
WCLL-FW UKAEA
107 wcll_169.617 616 n WCLL-VV
WCLL-VV UKAEA
108 wccb_ht.617 616 n WCCB-FW
WCCB-FW UKAEA
109 wccb_169.617 616 n WCCB-VV
WCCB-VV UKAEA
110 hcpb_ht.617 616 n HCPB-FW
HCPB-FW UKAEA
111 hcpb_169.617 616 n HCPB-VV
HCPB-VV UKAEA
112 hcll_ht.617 616 n HCLL-FW
HCLL-FW UKAEA
113 hcll_169.617 616 n HCLL-VV
HCLL-VV UKAEA
114 maxwellian_1 709 n Maxwellian-1keV
Maxwellian-1keV UKAEA
115 maxwellian_5 709 n Maxwellian-5keV
Maxwellian-5keV UKAEA
116 maxwellian_10 709 n Maxwellian-10keV
Maxwellian-10keV UKAEA
117 maxwellian_30 709 n Maxwellian-30keV
Maxwellian-30keV UKAEA
118 maxwellian_80 709 n Maxwellian-80keV
Maxwellian-80keV UKAEA
119 kfk-O1963-max_25-30 30 n Maxwellian-25keV
Maxwellian-25keV EXFOR 01963
120 fzj-31724-ambe-46 46 n Am-Be
Am-Be EXFOR 31724
121 ess-117 117 n ESS-2GeV
ESS-2GeV ESS
122 cern-h4irrad-288 288 n CERN-H4IRRAD
CERN-H4IRRAD CERN