ENDF file definitions and supplied nuclear data
FISPACT-II employs the standard ENDF reaction mt and other numbers to identify incident particle reactions, residual nuclide production, dpa, kerma, decay processes, fission yields, etc, depending on the library used and the completeness of the data. Below are descriptive lists which serve as a dictionary between the ENDF-6 values, corresponding FISPACT-II internal values, physical description and the details of the code use of these data. For more information on the the ENDF-6 format, see the ENDF-6 Manual.
Contents
Neutron-induced reaction mt numbers
The table below lists all of the possible incident-particle reaction mt numbers that are read by FISPACT-II, as well as their products, N-Z modification of the parent, number of and species of the secondary particles. Note that two values mt=5,18 result in the removal of the parent nuclide and residuals are handled by a separate set of rules that employ mf=10 residual yields or mf=8 fission yields. For mf=10, the residual product data must be available in the incident-particle files and for mf=8 the user must employ the USEFISSION keyword and specify the requested fission yields. For more information see the fission example simulation.
Projectile | Products | MT | dZ | dZ | NSEC | Secondaries |
---|---|---|---|---|---|---|
n | total | 1 | 0 | 0 | 0 | |
n | E | 2 | 0 | 0 | 0 | |
n | nonel | 3 | 0 | 0 | 0 | |
n | n | 4 | 0 | 0 | 0 | |
n | O | 5 | 0 | |||
n | 2nd | 11 | -1 | -3 | 1 | \(^{2}\)H |
n | 2n | 16 | 0 | -1 | 0 | |
n | 3n | 17 | 0 | -2 | 0 | |
n | F | 18 | 0 | |||
n | nα | 22 | -2 | -4 | 1 | \(^{4}\)He |
n | n3α | 23 | -6 | -12 | 3 | \(^{4}\)He \(^{4}\)He \(^{4}\)He |
n | 2nα | 24 | -2 | -5 | 1 | \(^{4}\)He |
n | 3nα | 25 | -2 | -6 | 1 | \(^{4}\)He |
n | np | 28 | -1 | -1 | 1 | \(^{1}\)H |
n | n2α | 29 | -4 | -8 | 2 | \(^{4}\)He \(^{4}\)He |
n | 2n2α | 30 | -4 | -9 | 2 | \(^{4}\)He \(^{4}\)He |
n | nd | 32 | -1 | -2 | 1 | \(^{2}\)H |
n | nt | 33 | -1 | -3 | 1 | \(^{3}\)H |
n | nh | 34 | -2 | -3 | 1 | \(^{3}\)He |
n | nd2α | 35 | -5 | -10 | 3 | \(^{2}\)H \(^{4}\)He \(^{4}\)He |
n | nt2α | 36 | -5 | -11 | 3 | \(^{3}\)H \(^{4}\)He \(^{4}\)He |
n | 4n | 37 | 0 | -3 | 0 | |
n | 2np | 41 | -1 | -2 | 1 | \(^{1}\)H |
n | 3np | 42 | -1 | -3 | 1 | \(^{1}\)H |
n | n2p | 44 | -2 | -2 | 2 | \(^{1}\)H \(^{1}\)H |
n | npα | 45 | -3 | -5 | 2 | \(^{1}\)H \(^{4}\)He |
n | γ | 102 | 0 | 1 | 0 | |
n | p | 103 | -1 | 0 | 1 | \(^{1}\)H |
n | d | 104 | -1 | -1 | 1 | \(^{2}\)H |
n | t | 105 | -1 | -2 | 1 | \(^{3}\)H |
n | h | 106 | -2 | -2 | 1 | \(^{3}\)He |
n | α | 107 | -2 | -3 | 1 | \(^{4}\)He |
n | 2α | 108 | -4 | -7 | 2 | \(^{4}\)He \(^{4}\)He |
n | 3α | 109 | -6 | -11 | 3 | \(^{4}\)He \(^{4}\)He \(^{4}\)He |
n | 2p | 111 | -2 | -1 | 2 | \(^{1}\)H \(^{1}\)H |
n | pα | 112 | -3 | -4 | 2 | \(^{1}\)H \(^{4}\)He |
n | t2α | 113 | -5 | -10 | 3 | \(^{3}\)H \(^{4}\)He \(^{4}\)He |
n | d2α | 114 | -5 | -9 | 3 | \(^{2}\)H \(^{4}\)He \(^{4}\)He |
n | pd | 115 | -2 | -2 | 2 | \(^{1}\)H \(^{2}\)H |
n | pt | 116 | -2 | -3 | 2 | \(^{1}\)H \(^{3}\)H |
n | dα | 117 | -3 | -5 | 2 | \(^{2}\)H \(^{4}\)He |
n | 5n | 152 | 0 | -4 | 0 | |
n | 6n | 153 | 0 | -5 | 0 | |
n | 2nt | 154 | -1 | -4 | 1 | \(^{3}\)H |
n | tα | 155 | -3 | -6 | 2 | \(^{3}\)H \(^{4}\)He |
n | 4np | 156 | -1 | -4 | 1 | \(^{1}\)H |
n | 3nd | 157 | -1 | -4 | 1 | \(^{2}\)H |
n | ndα | 158 | -3 | -6 | 2 | \(^{2}\)H \(^{4}\)He |
n | 2npα | 159 | -3 | -6 | 2 | \(^{1}\)H \(^{4}\)He |
n | 7n | 160 | 0 | -6 | 0 | |
n | 8n | 161 | 0 | -7 | 0 | |
n | 5np | 162 | -1 | -5 | 1 | \(^{1}\)H |
n | 6np | 163 | -1 | -6 | 1 | \(^{1}\)H |
n | 7np | 164 | -1 | -7 | 1 | \(^{1}\)H |
n | 4nα | 165 | -2 | -7 | 1 | \(^{4}\)He |
n | 5nα | 166 | -2 | -8 | 1 | \(^{4}\)He |
n | 6nα | 167 | -2 | -9 | 1 | \(^{4}\)He |
n | 7nα | 168 | -2 | -10 | 1 | \(^{4}\)He |
n | 4nd | 169 | -1 | -5 | 1 | \(^{2}\)H |
n | 5nd | 170 | -1 | -6 | 1 | \(^{2}\)H |
n | 6nd | 171 | -1 | -7 | 1 | \(^{2}\)H |
n | 3nt | 172 | -1 | -5 | 1 | \(^{3}\)H |
n | 4nt | 173 | -1 | -6 | 1 | \(^{3}\)H |
n | 5nt | 174 | -1 | -7 | 1 | \(^{3}\)H |
n | 6nt | 175 | -1 | -8 | 1 | \(^{3}\)H |
n | 2nh | 176 | -2 | -4 | 1 | \(^{3}\)He |
n | 3nh | 177 | -2 | -5 | 1 | \(^{3}\)He |
n | 4nh | 178 | -2 | -6 | 1 | \(^{3}\)He |
n | 3n2p | 179 | -2 | -4 | 2 | \(^{1}\)H \(^{1}\)H |
n | 3n2α | 180 | -4 | -10 | 2 | \(^{4}\)He \(^{4}\)He |
n | 3npα | 181 | -3 | -7 | 2 | \(^{1}\)H \(^{4}\)He |
n | dt | 182 | -2 | -4 | 2 | \(^{2}\)H \(^{3}\)H |
n | npd | 183 | -2 | -3 | 2 | \(^{1}\)H \(^{2}\)H |
n | npt | 184 | -2 | -4 | 2 | \(^{1}\)H \(^{3}\)H |
n | ndt | 185 | -2 | -5 | 2 | \(^{2}\)H \(^{3}\)H |
n | nph | 186 | -3 | -4 | 2 | \(^{1}\)H \(^{3}\)He |
n | ndh | 187 | -3 | -5 | 2 | \(^{2}\)H \(^{3}\)He |
n | nth | 188 | -3 | -6 | 2 | \(^{3}\)H \(^{3}\)He |
n | ntα | 189 | -3 | -7 | 2 | \(^{3}\)H \(^{4}\)He |
n | 2n2p | 190 | -2 | -3 | 2 | \(^{1}\)H \(^{1}\)H |
n | ph | 191 | -3 | -3 | 2 | \(^{1}\)H \(^{3}\)He |
n | dh | 192 | -3 | -4 | 2 | \(^{2}\)H \(^{3}\)He |
n | hα | 193 | -4 | -6 | 2 | \(^{3}\)He \(^{4}\)He |
n | 4n2p | 194 | -2 | -5 | 2 | \(^{1}\)H \(^{1}\)H |
n | 4n2α | 195 | -4 | -11 | 2 | \(^{4}\)He \(^{4}\)He |
n | 4npα | 196 | -3 | -8 | 2 | \(^{1}\)H \(^{4}\)He |
n | 3p | 197 | -3 | -2 | 3 | \(^{1}\)H \(^{1}\)H \(^{1}\)H |
n | n3p | 198 | -3 | -3 | 3 | \(^{1}\)H \(^{1}\)H \(^{1}\)H |
n | 3n2pα | 199 | -4 | -8 | 3 | \(^{1}\)H \(^{1}\)H \(^{4}\)He |
n | 5n2p | 200 | -2 | -6 | 2 | \(^{1}\)H \(^{1}\)H |
Derived induced-particle reaction mt numbers
Several nuclear data values are not provided in the raw ENDF data, requiring summation where desired (such as gas production by species) or semi-empirical formulae to generate derived quantities such as kerma or dpa. These are done through the nuclear data processing scripts that are used to generate the nuclear data supplied with FISPACT-II. The following data are listed with their mt numbers and a physical description.
Note that these are for user information and do not affect the nuclide inventories, hence the lack of columns from the previous table.
MT | Description |
---|---|
201 | (z,Xn) Total neutron production |
202 | (z,X\(\gamma\)) Total gamma production |
203 | (z,Xp) Total proton production |
204 | (z,Xd) Total deuteron production |
205 | (z,Xt) Total triton production |
206 | (z,Xh) Total helion (3He) production |
207 | (z,Xα) Total alpha particle production |
301 | Kerma total (eV-barns) |
302 | Kerma elastic |
303 | Kerma non-elastic (all but mt=2) |
304 | Kerma inelastic (mt={51-91}) |
318 | Kerma fission (mt=18 or mt= {19, 20, 21, 38}) |
401 | Kerma disappearance (mt={102-120}) |
402 | Kerma radiative capture (mt=102) |
403 | Kerma proton production (mt=103) |
407 | Kerma α production (mt=107) |
442 | Total photon (eV-barns) |
443 | Total kinematic kerma (high limit) |
444 | Dpa total (eV-barns) |
445 | Dpa elastic (mt=2) |
446 | Dpa inelastic (mt={51-91}) |
447 | Dpa disappearance (mt={102-120}) |
Radioactive decay processes
FISPACT-II allows 27 decay processes and 9 decay radiation types that are used to follow the nuclide inventory and generate decay radiation source terms, respectively. These are summarised below.
Decay types
The table below gives the internal IRT numbers and their ENDF-6 correspondence, as well as the parent nuclide N-Z shift, number and species of secondaries and how the code reports the decay in output data. Note that thres values IRT=6,17,27 result in the removal of the parent nuclide and residuals are handled by a separate set of rules that employ spontaneous fission yields. The user must employ the READSF keyword and include a sf_endf directory in the files file.
STYP | RTYP | Description | \(\Delta Z\) | \(\Delta A\) | Code | NSEC | Secs |
---|---|---|---|---|---|---|---|
1 | 1 | \(\beta^-\) decay | 1 | 0 | b- | 0 | |
2 | 2 | \(\beta^+\) decay or electron capture | \(-\)1 | 0 | b+ | 0 | |
3 | 3 | isomeric transition (IT) | 0 | 0 | IT | 0 | |
4 | 4 | \(\alpha\) decay | \(-\)2 | \(-\)4 | a | 1 | \(^4\)He |
5 | 5 | neutron emission | 0 | \(-\)1 | n | 0 | |
6 | 6 | spontaneous fission (SF) | \(-\)999 | \(-\)999 | SF | 0 | |
7 | 7 | proton emission | \(-\)1 | \(-\)1 | p | 1 | \(^1\)H |
8 | 8 | not used | 0 | 0 | 0 | ||
9 | 9 | not used | 0 | 0 | 0 | ||
10 | 10 | unknown | 0 | 0 | 0 | ||
11 | 1.5 | \(\beta^-\) decay + neutron emission | 1 | \(-\)1 | b-n | 0 | |
12 | 1.4 | \(\beta^-\) decay + \(\alpha\) emission | \(-\)1 | \(-\)4 | b-a | 1 | \(^4\)He |
13 | 2.4 | \(\beta^+\) decay + \(\alpha\) emission | \(-\)3 | \(-\)4 | b+a | 1 | \(^4\)He |
14 | 2.7 | \(\beta^+\) decay + proton emission | \(-\)2 | \(-\)1 | b+p | 1 | \(^1\)H |
15 | 3.4 | IT followed by \(\alpha\) emission | \(-\)2 | \(-\)4 | IT+a | 1 | \(^4\)He |
16 | 1.1 | double \(\beta^-\) decay | 2 | 0 | b-b- | 0 | |
17 | 1.6 | \(\beta^-\) decay followed by SF | \(-\)999 | \(-\)999 | b-SF | 0 | |
18 | 7.7 | double proton emission | \(-\)2 | \(-\)2 | pp | 2 | \(^1\)H \(^1\)H |
19 | 2.2 | double \(\beta^+\) or electron capture | \(-\)2 | 0 | b+b+ | 0 | |
20 | 1.55 | \(\beta^-\) and double neutron emission | 1 | \(-\)2 | b-2n | 0 | |
21 | 1.555 | \(\beta^-\) and triple neutron emission | 1 | \(-\)3 | b-3n | 0 | |
22 | 1.5555 | \(\beta^-\) and quadruple neutron emission | 1 | \(-\)4 | b-4n | 0 | |
23 | 5.5 | double neutron emission | 0 | \(-\)2 | 2n | 0 | |
24 | 5.55 | triple neutron emission | 0 | \(-\)3 | 3n | 0 | |
25 | 2.77 | \(\beta^+\) decay + double proton emission | \(-\)3 | \(-\)2 | b+2p | 2 | \(^1\)H \(^1\)H |
26 | 2.777 | \(\beta^+\) decay + triple proton emission | \(-\)4 | \(-\)3 | b+3p | 3 | \(^1\)H \(^1\)H \(^1\)H |
27 | 2.6 | \(\beta^+\) decay followed by SF | \(-\)999 | \(-\)999 | b+SF | 0 |
Decay radiation types
For decay radiation, FISPACT-II allows 9 radiation types which are taken from the ENDF-6 manual. Their physical description and how the code reports the data are summarised in the table below.
STYP | Radiation type | Code | |
---|---|---|---|
0 | \(\gamma\) | gamma rays | gamma |
1 | \(\beta^-\) | beta rays | beta |
2 | ec,\(beta^+\) | electron capture and/or positron emission | ec, beta+ |
3 | not known | not known | |
4 | \(\alpha\) | alpha particles | alpha |
5 | \(n\) | neutrons | n |
6 | SF | spontaneous fission fragments | SF |
7 | \(p\) | protons | p |
8 | \(e^-\) | "discrete electrons" | e- |
9 | \(x\) | X-rays and annihilation radiation | x |