[fluka-discuss]: Observed Anomalies for low energy (10 MeV) neutron beam.

From: Mina Nozar <nozarm_at_triumf.ca>
Date: Mon, 9 May 2016 16:18:51 -0700

Hello everyone,

I am doing a study to optimize neutron collimation for a setup. I
initially wanted to know the neutron attenuation lengths for Lead, Iron,
Concrete, and High density Polyethylene for incident neutron beam
energies of 10, 30, 100, and 500 MeV.

There are two features in the results of the 10 MeV neutron beam that I
do not understand.

1) When I look at photon fluence in the shielding material and in a
detector placed one meter from the shielding, I see photons at energies
above the beam energy of 10 MeV. How can this be?

2) When I look at the side-view distribution of the neutron fluence, I
see some angular dependencies (peaks and valleys). Where are these
angular dependencies coming from?


I only see these features for the 10 MeV neutron beam runs. Attached,
please find plots for 1) and 2) above.


Thanks in advance,
Mina



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Received on Tue May 10 2016 - 05:38:00 CEST

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