| Summary: | BinaryLightIon many years bug | ||
|---|---|---|---|
| Product: | Geant4 | Reporter: | Ivantchenko A. <antoni> |
| Component: | processes/hadronic/models/binary_cascade | Assignee: | Gunter.Folger |
| Status: | ASSIGNED --- | ||
| Severity: | enhancement | CC: | Alberto.Ribon |
| Priority: | P5 | ||
| Version: | 9.6 | ||
| Hardware: | All | ||
| OS: | Linux | ||
| Attachments: | g4.9.6.ref02 test30 production | ||
Will need to look into this. Do you observe similar peaks at other, higher, energies? This problem for BinaryLightIon is seen mainly for thin targets, 135 MeV/Nuc, He4 beam (or few C12, Ne20), targets are different. At higher energies 290 MeV/Nuc it is very small, at 400 MeV/Nuc it dissapeares. Sorry for publishing it as bug report - it is actually model property. Please see here - http://antoni.web.cern.ch/antoni/results/test30/geant4-09-06-ref-02/c_c_400/afig.gif it is even more problematic for all models. Gunter (to whom this bug is assigned to) said that this bug again is on Binary Light Ion cascade. This time Anton Ivantchenko reports on a un-physical peak in the energy distribution of secondary neutrons at small angles for low energy primaries. It is unclear if this is a problem or feature, and needs time even to reproduce. The problem is reproduced. The cause is a bad handling of spectator neutrons when there is no spectator nucleus after the interaction. The spectator neutrons are added as secondaries with about the initial momentum, ignoring Fermi momentum. I need to find a way to transfer the Fermi momentum from initial to final state. |
Created attachment 205 [details] g4.9.6.ref02 test30 production Please see attachment. already 2 or 3 releases we see this bug in BICion at 135 MeV/Nuc, at forward angles, typically He4 or C12 beams. May be somebody can solve it ? No QMD, no INCL (bad model for ions) do not have this problem, but Abrasion also has it. regards,