Re: piont-wise cross section

From: Francesco Cerutti <>
Date: Tue, 21 Feb 2012 18:02:58 +0100


I would like to take the liberty to make some remarks in order to prevent
possible misunderstandings

- peak in the pulse height spectrum (energy deposition spectrum). As Mary
pointed out, this comes from neutrons undergoing just one elastic
scattering event in the detector and is actually an artefact due to the
unique kerma value for the given energy. Further scattering events
(in a larger cavity) would smooth out the spectrum.
Therefore, such a peak is not related to possible peaks in the total cross
section as a function of the neutron energy.

- considering now the latter, this naturally displays (elastic and
inelastic) peaks both for carbon and oxygen. The one mentioned by Mary at
~430keV in oxygen, actually is elastic: at that energy capture is several
orders of magnitude lower.

- still it's highly appreciated the effort of sending to the list clean
input files, free from unrelevant cards, to collaborate in speeding up the
diagnosis process

Hope this helps


Francesco Cerutti
CH-1211 Geneva 23
tel. ++41 22 7678962
fax ++41 22 7668854
Received on Tue Feb 21 2012 - 18:48:06 CET

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