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<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Dear Nicolas,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">many thanks for your suggestion. I included the ShieldingLEND physics list in GATE as you suggested. Using the new model, the neutron production rate is closer to what I expect from a simple calculation.
Yet, it is still a factor 40-50% less than the calculated value. I’m not shure what is still causing this deviation. I’m using the photoneutron crosssections from Dietrich et al. (</span><a href="https://doi.org/10.1016/0092-640X(88)90033-2" target="_blank" title="Persistent link using digital object identifier">https://doi.org/10.1016/0092-640X(88)90033-2</a><span style="mso-fareast-language:EN-US">)
for my calculations.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">In Geant4, I get reasonable results using the Hadr03 example with a modified version
</span>GammaNuclearPhysics.cc including LEND processes as suggested <a href="https://geant4-forum.web.cern.ch/t/understimating-neutron-flux/999/10">
here</a>. Do you know if there is a way to use this modified Version of GammaNuclearPhysics.cc in GATE?
<span style="mso-fareast-language:EN-US"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Best regards<o:p></o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="mso-fareast-language:EN-US">Johannes<o:p></o:p></span></p>
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<p class="MsoNormal"><b>Von:</b> narbor <nicolas.arbor@iphc.cnrs.fr> <br>
<b>Gesendet:</b> Sonntag, 16. Februar 2020 21:25<br>
<b>An:</b> von Vangerow Johannes <Johannes.vonVangerow@ptw.de><br>
<b>Betreff:</b> Re: [Gate-users] Is photoneutron yield in Gate/Geant4 underestimated?<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:10.0pt">Dear Johannes,<br>
<br>
From what I know (from Geant4 developers) you can now used ENDF/BVII.1 data for photonuclear reaction (as with MCNP) by selecting ShieldingLEND physics list in GATE.<br>
<br>
As you said, previous version of Geant4 (< 10.04) used a parametrized model for photo-nuclear reactions that under-estimate neutrons production for many nuclei (with also a wrong threshold).<br>
<br>
Results are clearly better now with the LEND model (ENDF data) for gamma energy lower than 20 MeV.<br>
<br>
Best regards,<br>
<br>
Nicolas<br>
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PS : as John said, the best is always to ask directly Geant4 User Forum for this kind of Geant4 physics questions.</span>
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<pre>***********************************************************************<o:p></o:p></pre>
<pre>Nicolas ARBOR<o:p></o:p></pre>
<pre>Maître de Conférences<o:p></o:p></pre>
<pre>Université de Strasbourg - Faculté de Physique et Ingénierie<o:p></o:p></pre>
<pre>Groupe de recherche DeSIs - Institut Pluridisciplinaire Hubert Curien<o:p></o:p></pre>
<pre>23, rue du Loess BP28 67037 Strasbourg Cedex 2<o:p></o:p></pre>
<pre>mail : <a href="mailto:nicolas.arbor@iphc.cnrs.fr">nicolas.arbor@iphc.cnrs.fr</a> / tel : 03.88.10.64.27<o:p></o:p></pre>
<pre>***********************************************************************<o:p></o:p></pre>
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<p class="MsoNormal">Le 03/02/2020 à 16:55, John Apostolakis a écrit :<o:p></o:p></p>
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<p class="MsoNormal">Dear Johannes, <o:p></o:p></p>
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<p class="MsoNormal">I suggest to post this and similar questions in the Geant4 User Forum (<a href="https://geant4-forum.web.cern.ch/">https://geant4-forum.web.cern.ch/</a> ) , instead of the GATE mailing list, for a response from more Geant4 users and developers.<o:p></o:p></p>
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<p class="MsoNormal"><span style="color:black">John</span><o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Helvetica",sans-serif;color:black">John Apostolakis, EP Department, CERN<o:p></o:p></span></p>
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<p class="MsoNormal">On 3 Feb 2020, at 16:13, von Vangerow Johannes <<a href="mailto:Johannes.vonVangerow@ptw.de">Johannes.vonVangerow@ptw.de</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Hi,<o:p></o:p></p>
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<p class="MsoNormal">I am just starting to perform simulations in Gate including Neutrons. Concerning that, I performed a simulation with 15MeV photons impinging on a thin (10µm) target. The simulation in Gate / Geant4 yields about a factor 3 less neutrons
than a simple calculation using the respective crosssection. So far I tested W and Pb.<o:p></o:p></p>
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<p class="MsoNormal">In a publication<span class="apple-converted-space"> </span><a href="https://www.epj-conferences.org/articles/epjconf/pdf/2017/22/epjconf_icrs2017_06023.pdf"><span style="color:#954F72">„Quantification of the validity of simulations based
on Geant4 and FLUKA for photo-nuclear interactions in the high energy range“</span></a><span class="apple-converted-space"> </span>it is stated that Geant4 underestimates the Neutron production. Is this really true? I am using the QGSP_BIC_HP physics list.<o:p></o:p></p>
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<p class="MsoNormal">Best regards<o:p></o:p></p>
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<p class="MsoNormal">Johannes<o:p></o:p></p>
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