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GiBUU

Collision List

Starting with r7768 (resp. GiBUU 2019, patch 6), some additional output is possible, were all interactions at a given time step are reported in order to enable a 'replay' of the whole interactions like in a 'movie'.

This feature may be switched on by selecting in the input job card

&input
 ...
 printCollisionList = T
 ...
/

Then, two files will be generated:

File 1: 'collisionList0.txt'

In this file, all particles after the initialization are listed. For elementary interactions on a nucleus, this includes the nucleons, i.e. the ("real") particles, as also the final state particles of the first interaction, the "perturbative" particles.

The format is :

  iEns, uniqueID, ID, Q, anti, mass, p(0:3), x(1:3), weight

this may look like

    1    100000   1  0  F   0.938   9.0225371E-01 -1.0175047E-01  1.4338646E-01 -5.9321802E-02  1.298E+00 -2.045E-01 -1.445E+00  0.000E+00
    1    100001   1  1  F   0.938   9.2944725E-01  1.4480108E-01 -1.2407325E-01  6.9979513E-02  7.446E-01  2.159E+00  1.451E+00  0.000E+00
    1    100002   1  1  F   0.938   8.9556552E-01 -7.1821512E-02 -2.7760721E-02 -1.0462916E-01 -1.503E+00  5.835E-01  1.476E+00  0.000E+00
    1    100003   1  0  F   0.938   9.2123883E-01  1.4628513E-02 -2.1647804E-01  8.8490566E-03 -9.670E-01 -4.893E-01  2.062E+00  0.000E+00
    1    100004   1  0  F   0.938   9.1561085E-01 -1.6724257E-01  1.2410322E-01 -2.4296521E-02 -1.479E+00 -1.640E+00 -5.354E-02  0.000E+00
    1    100005   1  0  F   0.938   9.2435197E-01  6.4056098E-02  1.0551280E-01 -1.8530766E-01 -2.293E+00  4.795E-01  3.995E-01  0.000E+00
    1    100006   1  0  F   0.938   9.0848757E-01  8.4948960E-03  2.5629057E-02  2.8852763E-03  2.254E+00  1.444E+00  1.011E+00  0.000E+00
    1    100007   1  1  F   0.938   9.2124230E-01  1.2271338E-01 -1.2203073E-01  1.3602550E-01 -6.754E-01 -1.140E+00 -1.884E+00  0.000E+00
    1    100008   1  1  F   0.938   9.1603120E-01 -4.4013649E-02  1.5004671E-02 -9.7962175E-02  7.109E-01  2.751E+00 -4.049E-01  0.000E+00
    1    100009   1  1  F   0.938   9.0399729E-01  1.5904738E-01  5.4389651E-02  1.4048569E-01 -5.512E-01 -1.614E-01 -8.989E-01  0.000E+00
    1    100010   1  0  F   0.938   9.1452095E-01 -1.2238473E-01 -3.4499420E-03  5.6098772E-02 -1.613E+00 -1.303E+00 -1.741E+00  0.000E+00
    1    100011   1  1  F   0.938   8.9095417E-01 -6.2248362E-03  2.7860515E-02  5.9183972E-02 -1.106E+00  1.110E+00  1.728E+00  0.000E+00
    2    100000   1  0  F   0.938   9.2429523E-01 -1.8125733E-01 -7.6394282E-02 -6.8386820E-02 -1.881E+00  1.440E+00 -8.276E-01  0.000E+00
    2    100001   1  1  F   0.938   9.0028011E-01 -1.3851042E-01 -1.9553798E-02 -1.5139204E-01  4.042E-01 -1.214E+00 -5.098E-02  0.000E+00
    2    100002   1  1  F   0.938   9.1118596E-01  1.5711670E-01 -4.7781645E-02 -5.2372578E-02 -2.273E+00  1.429E-01  7.071E-01  0.000E+00
    2    100003   1  0  F   0.938   9.1986964E-01  1.3225418E-01 -3.6055300E-02  2.2317658E-01 -4.531E-01  2.377E-01 -6.777E-01  0.000E+00
...
    0    102010   1  1  F   0.938   9.3054329E-01 -1.2401825E-01 -1.3856814E-01  1.7359920E-01 -3.126E-01 -7.613E-01  2.088E+00  1.281E-05
    0    103010   2  2  F   1.233   1.4077665E+00  9.2230122E-02 -1.3803540E-01  6.7964828E-01  1.529E+00  2.950E-01 -1.322E+00  4.336E-04
    0    104010   1  1  F   0.938   1.0136648E+00  1.0922668E-01 -2.8159415E-01  3.2014525E-01 -1.990E+00 -1.084E-01  1.585E+00  1.951E-05
    0    105010   1  0  F   0.938   9.4824313E-01  1.0381421E-01 -2.7787332E-01 -1.2825038E-01 -7.045E-01 -6.190E-01 -1.417E+00  4.808E-05
    0    106011   1  1  F   0.829   1.0627097E+00  3.9430686E-01  1.6178318E-01  5.4118979E-01 -3.677E-01 -1.388E+00  1.459E+00  7.179E-07
    0    101011   1  1  F   0.938   1.0673551E+00 -4.5864374E-01 -2.9886956E-01  4.8420086E-02  6.356E-01 -6.061E-01  9.032E-01  7.665E-05
    0    102011   1  1  F   0.938   1.0859960E+00  2.3468971E-01 -1.9343362E-01  4.9932654E-01 -3.126E-01 -7.613E-01  2.088E+00  1.281E-05
    0    103011   1  1  F   0.938   9.5196799E-01 -1.1318322E-01  1.9614653E-01  2.4629894E-01  1.237E-01  1.392E+00 -2.116E-01  3.981E-05
    0    104011   1  1  F   0.938   9.7048049E-01  2.8453081E-01 -1.4053610E-01  1.2536834E-01 -1.990E+00 -1.084E-01  1.585E+00  1.951E-05
    0    105011   1  1  F   0.938   9.9024210E-01 -8.6362088E-02 -1.1494796E-01  3.8632705E-01 -7.045E-01 -6.190E-01 -1.417E+00  4.808E-05

The file starts with a list of the nucleons (real particles), and then lists the perturbative particles, which are the outgoing particles after the first initial collision.

File 2: 'collisionList.txt'

In this file, all interactions are listed.

The first line indicates the time 'time', the kind of process 'iProc', the number of outgoing particles 'nOut', and the internal coordinates (iEns, iID) of the incoming particles

  time, iProc, nOut, iEns1,iID1 [, iEns2,iID2 [, iEns3,iID3 ]]

The coding of 'iProc' is:

  • 1-body: 11= real particle decay, 12= pert.particle decay
  • 2-body: 211= real+real , 212= real+pert
  • 3-body: 3111= real+real+real, 3112= real+real+pert

Then 'nOut' lines indicating the outgoing particles are given as in 'collisionList0.txt'.

This may look like

...
 0.20   12  2     0    100030 
    0    106451 101  1  F   0.138   5.3364454E-01  4.2980800E-01  1.4786484E-01  2.4317394E-01 -2.418E-01  2.748E+00  1.235E+00  4.283E-04
    0    106452   1  1  F   0.938   1.1572417E+00  2.4602193E-02  2.7953711E-01  6.3332541E-01 -2.418E-01  2.748E+00  1.235E+00  4.283E-04
...
 0.20  212  2   297    100006     0    102310 
    0    106884   1  0  F   0.938   1.0166981E+00 -4.8005309E-02 -3.1762840E-01  3.3194100E-01  3.752E-01  9.357E-01  1.635E+00  1.662E-05
    0    106885   1  1  F   0.938   9.7085166E-01 -3.3714697E-01 -5.3550798E-02  1.3946998E-01  4.108E-01  7.829E-01  1.711E+00  1.662E-05
...

The first example is the decay of the perturbative particle 100030 into the 2 perturbative particles 106451 and 106452 (pion and nucleon).

The second example is the collision of the perturbative particle 102310 with the real particle (nucleon) 100006 in ensemble 297, producing the two perturbative nucleons 106884 and 106885.

Due to technical reasons, it is not sufficient to just look at the uniqueID of real particles, since this may be repeated in every ensemble. Thus only the combination of ensemble number and unique ID identifies the particle. This is not necessary for perturbative particles. To avoid confusion, here the number of the ensemble is always set to 0.

Last modified 3 months ago Last modified on Feb 27, 2020, 6:39:38 PM