Dear all,
I am working with a 18.5 MeV neutron source with a concrete bunker as shield.
I am facing a problem,
Without the HP model, FTFT_BERT and QGSP_BERT, QBBC etc are working fine.
Should I ignore the transmitted neutrons? And why HP models are unable to shield these? I fear there is some problem here. Please suggest which physics list I should use here?
I’m pretty sure, that HP Physics Lists are working well for neutrons. Also, a MeV neutrons can penetrate a little inside concrete walls, but you know that.
Please give us more details, e.g. run3.mac file, materials of the geometry, dimensions. I can try to reproduce this effect for you.
I assume, that geometry doesn’t have any overlapping volumes.
Dear MKasztelan.
thanks for the reply.
The bunker is a 101010 cubic meter hollow box where inner wall thickness is 2.44 m all around. In the center, a neutron particle gun is set and bombarding along z direction. I am using varoius concrete mixtures , you can try G4_concrete.
The run3.mac file is here.Processing: run3.mac…
Ordinary Physics Lists like QBBC or QGSP_BIC may provide reasonable results but at the same time many users use QGSP_BIC_HP or FTFP_BERT_HP and have good results or even better. If you face such problem, you need to check how you enable Physics Lists in your application.