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<p class="MsoNormal">Hi All<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">For next week’s journal club (Wed 21<sup>st</sup>) I will be presenting the attached paper about the search for variations in the decay constant.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Some Questions/Discussion Points.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<ol style="margin-top:0cm" start="1" type="1">
<li class="MsoNormal" style="mso-list:l0 level1 lfo3">What would be the consequences of variations in the decay constant?<o:p></o:p></li><li class="MsoNormal" style="mso-list:l0 level1 lfo3">The activity of the sources is calculated by integrating the full energy spectrum, why measure activity above the full photopeak energy.<o:p></o:p></li><li class="MsoNormal" style="mso-list:l0 level1 lfo3"><sup>40</sup>K decays predominately via
<span style="color:black">â<sup>- </sup>decay to <sup>40</sup>Ca without the emission of a ã ray. As the experiment is insensitive to this type of decay can they discount variations in the decay rate.</span><o:p></o:p></li><li class="MsoNormal" style="mso-list:l0 level1 lfo3"><span style="color:black">The detector experiences a significant gain shift over the course of the experiment. What could be the cause of this shift?
</span><o:p></o:p></li><li class="MsoNormal" style="mso-list:l0 level1 lfo3"><span style="color:black">In Fig 7 why is the standard deviation no longer horizontal after 100 days? The same effect is not seen in Fig 4 despite using the same methods.</span><o:p></o:p></li></ol>
<p class="MsoNormal"><span style="color:black"><o:p> </o:p></span></p>
<p class="MsoNormal">See you all at 3:30 in the MOB theory room. I assume snacks will be provided.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Main Journal Link<o:p></o:p></p>
<p class="MsoNormal"><a href="https://www.sciencedirect.com/science/article/pii/S0370269318301771">https://www.sciencedirect.com/science/article/pii/S0370269318301771</a><o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Regards<o:p></o:p></p>
<p class="MsoNormal">Stephen<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:"Arial",sans-serif;background:white;mso-fareast-language:EN-GB">Stephen Gillespie</span><span style="font-size:9.5pt;font-family:"Arial",sans-serif;mso-fareast-language:EN-GB"><br>
<br>
<span style="background:white">Postdoctoral Research Fellow</span><br>
<span style="background:white">Gamma Group</span><br>
<span style="background:white">TRIUMF</span><span style="color:#888888"><br>
<br>
</span></span><a href="mailto:sgillespie@triumf.ca"><span style="font-size:9.5pt;font-family:"Arial",sans-serif;color:#1155CC;background:white;mso-fareast-language:EN-GB">sgillespie@triumf.ca</span></a><span style="font-size:9.5pt;font-family:"Arial",sans-serif;color:#888888;mso-fareast-language:EN-GB"><br>
</span><a href="mailto:stephen.gillespie.90@gmail.com"><span style="font-size:9.5pt;font-family:"Arial",sans-serif;color:#1155CC;background:white;mso-fareast-language:EN-GB">stephen.gillespie.90@gmail.com</span></a><span style="font-size:9.5pt;font-family:"Arial",sans-serif;color:#888888;mso-fareast-language:EN-GB"><br>
</span><span style="font-size:9.5pt;font-family:"Arial",sans-serif;background:white;mso-fareast-language:EN-GB">Skype: s.gillespie.90</span><span style="mso-fareast-language:EN-GB"><o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
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