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Question Simulation of C11 production by cosmic Muons in liquid scintillator 

Forum: Hadronic Processes
Date: 08 Apr, 2010
From: Randolph Moellenberg <Randolph Moellenberg>

Hello,

i am trying to simulate the production of C11 (and other radionuclides) by cosmic muons in organic scintillator (PC, C_9 H_12). The energy of the cosmic muons are 270GeV, corresponding to the mean muon energy at the LNGS. I am using the QGSP_BERT_HP physics list with muon nuclear process activated (/physics_engine/tailor/MuonNuclear on).

The simulated number of produced neutrons (2.72e-4 /muon/g/cm²) is in good agreement with the experimental data, but only 1.4e-5 /muon/g/cm² C11 (the experimentally measured value by the Borexino Collaboration is 8.2e-5 /muon/g/cm² ) is produced.

After taking a closer look, i found out that muons and gammas do not produce C11 at all, although the channel gamma+C12->n+C11 should be the dominant one.

I hope anybody has an idea to solve this problem,

regards, Randolph

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