[Gate-users] Is photoneutron yield in Gate/Geant4 underestimated?

John Apostolakis John.Apostolakis at cern.ch
Mon Feb 3 16:55:52 CET 2020

Dear Johannes,

I suggest to post this and similar questions in the Geant4 User Forum (https://geant4-forum.web.cern.ch/ ) , instead of the GATE mailing list, for a response from more Geant4 users and developers.

John Apostolakis,  EP Department, CERN

On 3 Feb 2020, at 16:13, von Vangerow Johannes <Johannes.vonVangerow at ptw.de<mailto:Johannes.vonVangerow at ptw.de>> wrote:


I am just starting to perform simulations in Gate including Neutrons. Concerning that, I performed a simulation with 15MeV photons impinging on a thin (10µm) target. The simulation in Gate / Geant4 yields about a factor 3 less neutrons than a simple calculation using the respective crosssection. So far I tested W and Pb.

In a publication „Quantification of the validity of simulations based on Geant4 and FLUKA for photo-nuclear interactions in the high energy range“<https://www.epj-conferences.org/articles/epjconf/pdf/2017/22/epjconf_icrs2017_06023.pdf> it is stated that Geant4 underestimates the Neutron production. Is this really true? I am using the QGSP_BIC_HP physics list.

Best regards


Dr. Johannes von Vangerow
Software Development

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