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<font size="-1">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) </font><font
size="-1"><font size="-1">for gamma energy lower than 20 MeV.<br>
<br>
</font>Best regards,<br>
<br>
Nicolas<br>
<br>
PS : </font><font size="-1"><font size="-1"><font size="-1">as
John said, the best is always to ask directly Geant4 User
Forum for this kind of Geant4 physics questions.</font></font></font>
<pre class="moz-signature" cols="72">***********************************************************************
Nicolas ARBOR
Maître de Conférences
Université de Strasbourg - Faculté de Physique et Ingénierie
Groupe de recherche DeSIs - Institut Pluridisciplinaire Hubert Curien
23, rue du Loess BP28 67037 Strasbourg Cedex 2
mail : <a class="moz-txt-link-abbreviated" href="mailto:nicolas.arbor@iphc.cnrs.fr">nicolas.arbor@iphc.cnrs.fr</a> / tel : 03.88.10.64.27
***********************************************************************</pre>
<div class="moz-cite-prefix">Le 03/02/2020 à 16:55, John Apostolakis
a écrit :<br>
</div>
<blockquote type="cite"
cite="mid:5B8A2B0D-6050-46B5-B951-9D86C065A91E@cern.ch">
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
Dear Johannes,
<div class=""><br class="">
</div>
<div class="">I suggest to post this and similar questions in the
Geant4 User Forum (<a href="https://geant4-forum.web.cern.ch/"
class="" moz-do-not-send="true">https://geant4-forum.web.cern.ch/</a> )
, instead of the GATE mailing list, for a response from more
Geant4 users and developers.</div>
<div class=""><br class="">
</div>
<div class=""><span style="color: rgb(0, 0, 0); orphans: 2;
text-align: -webkit-auto; widows: 2;
-webkit-text-decorations-in-effect: none;" class="">John</span></div>
<div class="">
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class=""><span
class="Apple-style-span"
style="border-collapse: separate;
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<div class="">===================================================</div>
<div class="">John
Apostolakis, EP Department,
CERN</div>
<div class=""><br class="">
</div>
</div>
</span></span></div>
</div>
</span></div>
</span></div>
</span></div>
</span></div>
</span></div>
</span></div>
<div><br class="">
<blockquote type="cite" class="">
<div class="">On 3 Feb 2020, at 16:13, von Vangerow Johannes
<<a href="mailto:Johannes.vonVangerow@ptw.de" class=""
moz-do-not-send="true">Johannes.vonVangerow@ptw.de</a>>
wrote:</div>
<br class="Apple-interchange-newline">
<div class="">
<div class="WordSection1" style="page: WordSection1;
caret-color: rgb(0, 0, 0); font-family: Helvetica;
font-size: 12px; font-style: normal; font-variant-caps:
normal; font-weight: normal; letter-spacing: normal;
text-align: start; text-indent: 0px; text-transform:
none; white-space: normal; word-spacing: 0px;
-webkit-text-stroke-width: 0px; text-decoration: none;">
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt;
font-family: Calibri, sans-serif;" class="">
Hi,<o:p class=""></o:p></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt;
font-family: Calibri, sans-serif;" class="">
<o:p class=""> </o:p></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt;
font-family: Calibri, sans-serif;" class="">
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 class=""></o:p></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt;
font-family: Calibri, sans-serif;" class="">
<o:p class=""> </o:p></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt;
font-family: Calibri, sans-serif;" class="">
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"
style="color: rgb(149, 79, 114); text-decoration:
underline;" class="" moz-do-not-send="true">„Quantification
of the validity of simulations based on Geant4 and
FLUKA for photo-nuclear interactions in the high
energy range“</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 class=""></o:p></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt;
font-family: Calibri, sans-serif;" class="">
<o:p class=""> </o:p></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt;
font-family: Calibri, sans-serif;" class="">
Best regards<o:p class=""></o:p></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt;
font-family: Calibri, sans-serif;" class="">
<o:p class=""> </o:p></div>
<div style="margin: 0cm 0cm 0.0001pt; font-size: 11pt;
font-family: Calibri, sans-serif;" class="">
Johannes<o:p class=""></o:p></div>
</div>
<br style="caret-color: rgb(0, 0, 0); font-family:
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<span style="font-size: 9pt; font-family: Calibri;
color: navy;" class=""><strong class=""></strong></span><span
style="font-size: 9pt; font-family: Calibri; color:
navy;" class=""><span style="font-size: 9pt;
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<td class=""><font class="" size="2" face="Calibri"
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</tr>
<tr class="">
<td class=""><font class="" size="2" face="Calibri"
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</td>
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<pre class="moz-quote-pre" wrap="">_______________________________________________
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