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None cutoff for neutrons? 

Keywords: neutrons; low energy cutoff
Forum: Hadronic Processes
Date: 15 May, 2006
From: Sylvia Studeny <>


I'm doing calculating with low energy neutrons in a box-phantom out of voxels(50*50*50;2mm sidelength). First I did the calculations using just the high-precission models. Then I realiesed the for accurate results,I have to use the cross sections to.

The code is working fine, but it is awfully slow. I also tried to use LHEP_PRECO_HP physics list and this wasn't any faster, so I suppose that this is no mistake on my side (also, without cross sections, it is much faster! about 30 hours for 100 000 neutrons compared to 30 minutes)

Now, as I suspected the thermal neutron of slowing down everything, I looked into the manuals, if I could find some kind of methode to cut off the thermal neutrons and force capture or decay. Unfortunately, I found nothing. So my question now is:

Is there any way to speed up calculation without loosing to much accuracy? As I calculate energy deposition in voxels of 2mm dimension, some details will not be seen anyway. I found something about special tracking cuts, but there seems not to be any "afterlife" for the particle after being cut. Also if I have to programm the probability of forced decay/capture myself I have to admit, that it would be quite much work (and I would be a bit lost, as I have several different materials with up to 14 elements).

I hope very much that there is someone who has also had this problem (and hopefully solved it) and can tell me what to do about this.

Thanks a lot, Sylvia

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