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Forum: Physics List
Re: Question Geant4 for prompt gamma neutron activation analysis (PGAA) (Sakari Ihantola)
Re: Idea Re: Geant4 for prompt gamma neutron activation analysis (PGAA) (Vladimir Ivanchenko)
Date: 13 Feb, 2018
From: Sakari Ihantola <Sakari Ihantola>

Here is an example that hopefully highlights the problem a bit better.

A gamma ray spectrum produced in a 1 mm Gd-157 target by using the settings above: https://drive.google.com/open?id=1pDon1d-nyO0sCqegnDQoh8CAc_P0m8vZ

Same simulation with environment variable G4NEUTRONHP_USE_ONLY_PHOTONEVAPORATION=1: https://drive.google.com/open?id=1znz2ZtV88P4AV_62h7pcaPBCKGRdoPkD

The first spectrum is a continuum with no discrete peaks. The second spectrum has peaks at right energies, but the relative intensities do not seem to match with those reported, for example, here: https://www.nndc.bnl.gov/capgam/byn/page184.html. This is somewhat surprising, since the ENSDF data should contain the correct intensities of individual gamma emissions.

Cheers, Sakari

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