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<p class="MsoNormal">Dear Gate Users,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">We are running a simple simulation of a vacuum world, a GPS neutron source (monoenergetic at 10MeV), and a slab of concrete using the QGSP_BERT_HP physics list and are seeing all of the neutrons undergoing free neutron decay (to produce
a proton, electron, and electron antineutrino) at the source (this was verified by enabling verbose event tracking on a single history simulation). How can we disable either this type of event, or the temporal behaviour that’s causing it?<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Macros which reproduce this behaviour are attached.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Kind regards,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Andrew.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#663399;mso-fareast-language:EN-GB">Andrew Nixon<br>
Medical Physics - Trainee Clinical Scientist</span></b><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:EN-GB"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#663399;mso-fareast-language:EN-GB">Internal:</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:EN-GB"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#0066CC;mso-fareast-language:EN-GB"> 15068
</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:EN-GB"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#663399;mso-fareast-language:EN-GB">Email:</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:EN-GB"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#0066CC;mso-fareast-language:EN-GB"> Andrew.Nixon@uhb.nhs.uk</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:EN-GB"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:10.0pt;font-family:"Arial","sans-serif";color:#0066CC;mso-fareast-language:EN-GB"> http://www.uhb.nhs.uk</span><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:EN-GB"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman","serif";mso-fareast-language:EN-GB"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:7.5pt;font-family:"Arial","sans-serif";color:#0066CC;mso-fareast-language:EN-GB"><br>
Medical Physics - University Hospitals Birmingham NHS Foundation Trust<br>
<br>
Birmingham, B15 2TH<br>
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