Event IDs
There are 5 event types, with one additional identifier flag that can be used in PTRAC output:
| Event number |
Description |
Notes |
| 1000 |
Source (SRC) |
Birth of particle |
| ±(200N) |
Banked (BNK) |
Negative for rejected banked events, N determines the source of banked event |
| 3000 |
Surface (SUR) |
Particle crosses cell boundary |
| 4000 |
Collision (COL) |
Interaction event |
| 5000 |
Termination (TER) |
Death of particle |
| 9000 |
End of history |
Flag to identify final event in history |
Variable IDs
Taken from Table I.3 in MCNP5 manual, Appendix I with descriptions and notes as an interpretation of the relevant sections of the manual.
| ID number |
MCNP name |
Description |
Notes |
| NPS line |
|
|
|
| 1 |
NPS |
History number |
All NPS lines |
| 2 |
|
Type of first history event |
SRC, BNK, SUR, COL, TER |
| 3 |
NCL |
Cell number |
Omitted if not cell filtered |
| 4 |
NSF |
Nearest surface headed towards |
Omitted if not surface filtered |
| 5 |
JPTAL |
Tally specifier |
Omitted if not tally filtered |
| 6 |
TAL |
TFC specifier |
Omitted if not tally filtered |
| Event1 line |
|
|
|
| 7 |
|
Next event type |
BNK, SUR, COL, TER, END |
| 8 |
NODE |
Number of nodes in track from source to this point |
|
| 9 |
NSR |
Source number |
SRC events only |
| 10 |
NXS |
ZZAAA for interaction |
BNK and COL events only |
| 11 |
NYTN |
Reaction type (MT) |
BNK and COL events only |
| 12 |
NSF |
Surface number |
SUR events only |
| 13 |
|
Angle with surface normal (degrees) |
SUR events only |
| 14 |
NTER |
Termination type |
TER events only |
| 15 |
|
Branch number |
TER events only |
| 16 |
IPT |
Particle type |
Multi-particle transport only |
| 17 |
NCL |
Cell number |
All events |
| 18 |
MAT |
Material number |
All events |
| 19 |
NCP |
Number of collisions in history |
Write=all only |
| Event2 line |
|
|
|
| 20 |
XXX |
x-coordinate of event (cm) |
All events |
| 21 |
YYY |
y-coordinate of event (cm) |
All events |
| 22 |
ZZZ |
z-coordinate of event (cm) |
All events |
| 23 |
UUU |
x-component of exit direction vector |
Write=all only |
| 24 |
VVV |
y-component of exit direction vector |
Write=all only |
| 25 |
WWW |
z-component of exit direction vector |
Write=all only |
| 26 |
ERG |
Energy of particle after event |
Write=all only |
| 27 |
WGT |
Weight of particle after event |
Write=all only |
| 28 |
TME |
Time of event |
Write=all only |
