Gabriele Cosmo
48 lines
2.5 KiB
Plaintext
48 lines
2.5 KiB
Plaintext
List of tests of HE muon interactions in Geant4
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(By RPK 20-21.05.00)
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Thin target (to continue the works started):
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10 TeV, 100 cm iron, 10^5 muons, 4 processes: delta, brems, pairs, photonuclear
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(to compare with the expectation: X*?(T,?)*?*N?*?lg*log10)
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Remaining problems found at the moment:
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1) Knock-on electron production for high-energy muons has to be modified (including
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contribution from electron bremsstrahlung diagrams and radiative corrections); now it
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is not implemented properly;
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2) There is a hint for a peak near the edge of the distribution of energy lost by muon in
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photonuclear interaction (similar to that which was found and eliminated earlier in the
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bremsstrahlung); - problem has been solved! (L.U.,May 22nd)
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3) It is not clear whether the energy lost by muon is equal to the energy transferred to
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secondary particles (kinetic energy of delta-electron, total energy of electron and
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positron in pair production, etc.). There is a hint that they are different.
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4) With high statistics simulation, an error appears sometimes in
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G4HEInelastic::GenerateNBodyEvent (total mass >= total energy).
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After the general agreement is reached, to extend these calculations (with additional
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energy/material):
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Muon energies: 100 GeV and 10 TeV
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Materials: iron (100 cm, or 787 g/cm^2) and carbon (graphite, 500 cm x 2.265 g/cm^3)
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Again, after the agreement is reached, to perform calculations for iron and carbon target
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at 10 TeV energy with increased statistics (about 10^6 muons), to compare with
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expectation (also in terms of the ratio "simulated/expected"), to prepare beautiful pictures
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for inclusion in EM Physics gallery and other presentations.
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Thick target (distribution of the total energy lost by muon in bulk matter, including
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continuous energy loss and all 4 discrete processes), 3 m iron, 1 TeV muon energy,
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statistics about 10^5, then 10^6 muons:
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- histograms of the residual muon energy (in linear scale, 2 GeV bin) and of the energy
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lost by muon (in log scale, 0.10 bin in common logarithm); comparison is possible
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with Van Ginneken's TRAMU (the figure given by Particle Data Group) and with
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Geant 3.21** (A.Rybin); also simulation with original Geant 3.21 is of interest - to
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show, where it was wrong;
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- cut variation: with cut = 1 - 100 MeV the distribution should be the same (in
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particular, this is one of the tests of the consistency of continuous loss calculation);
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- histograms of the scattering angle and lateral displacement (nothing to compare? may
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be, Geant 3.21 ?).
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