<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<p><font size="+1">Hi,</font></p>
<p><font size="+1">The paper (attached) for the coming ISAC journal
club is <b>The Rydberg constant and proton size from atomic
hydrogen</b></font></p>
<p><font size="+1">[</font><font size="+1"><span role="menubar"><a
href="https://www.ncbi.nlm.nih.gov/pubmed/28983046#"
title="Science (New York, N.Y.)." role="menuitem"
moz-do-not-send="true">Science.</a></span> 2017 Oct
6;358(6359):79-85. doi: 10.1126/science.aah6677]</font></p>
<p><font size="+1">You can also use the comment on it from the same
issue (also attached)<br>
</font></p>
<p><font size="+1"><br>
</font></p>
<p><font size="+1">Questions (from easiest to hardest <span
class="moz-smiley-s1"><span>:-)</span></span> ):</font></p>
<p><font size="+1">1) What is the proton radius (puzzle) ?</font></p>
<p><font size="+1">2) Why do you (usually) need two measurements to
determine it, and why is </font><font size="+1"><font size="+1">the
1S-2S used</font>?</font></p>
<p><font size="+1">3) What are the main experimental challenges in
the precision goal of this measurement?<br>
</font></p>
<p><font size="+1">4) How are they overcome?</font></p>
<p><font size="+1">5) Is the use of sophisticated simulations no
longer needed?</font></p>
<p><font size="+1">6) Are there similar phenomena that might affect
measurements of nuclear spectra?</font></p>
<p><font size="+1">7) So what is the proton radius after all?<br>
</font></p>
<p><font size="+1"><br>
</font></p>
<font size="+1">Best,</font><br>
<font size="+1">Nir<br>
</font>
<p><br>
</p>
<pre class="moz-signature" cols="72">Dr. Nir Nevo Dinur
Postdoctoral Fellow
Theory Group
Physical Sciences Div.
TRIUMF
4004 Wesbrook Mall,
Vancouver, BC V6T 2A3, Canada
+1-604-222-1047x6445</pre>
<div class="moz-cite-prefix">On 11/20/17 10:34 AM, Nir Nevo Dinur
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:a5fd869c-718c-3df6-776a-38c5f63a7e56@triumf.ca">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<p><font size="+1">No problem!</font></p>
<p><font size="+1">I'll send you the paper + questions in a bit</font></p>
<font size="+1">Best,</font><br>
<font size="+1">Nir</font><br>
<pre class="moz-signature" cols="72">Dr. Nir Nevo Dinur
Postdoctoral Fellow
Theory Group
Physical Sciences Div.
TRIUMF
4004 Wesbrook Mall,
Vancouver, BC V6T 2A3, Canada
+1-604-222-1047x6445</pre>
<div class="moz-cite-prefix">On 11/20/17 10:31 AM, journalclub
wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAN7k-+Fa5XTi2Wxrk7ztX21JeyVQUtTpfw9okjk7H2dvLaCcMw@mail.gmail.com">
<div dir="auto">If you could do this week that would be amazing.
<div dir="auto">I dropped the ball bit and had other things
come up</div>
<div dir="auto">James S</div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Nov 20, 2017 9:54 AM, "Nir Nevo
Dinur" <<a href="mailto:nnevodinur@triumf.ca"
moz-do-not-send="true">nnevodinur@triumf.ca</a>> wrote:<br
type="attribution">
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="#FFFFFF" text="#000000">
<p><font size="+1">Hi,</font></p>
<p><font size="+1">I can present something this week or
whenever, if needed.</font></p>
<font size="+1">Best,</font><br>
<font size="+1">Nir</font><br>
<pre class="m_6554660994247985372moz-signature" cols="72">Dr. Nir Nevo Dinur
Postdoctoral Fellow
Theory Group
Physical Sciences Div.
TRIUMF
4004 Wesbrook Mall,
Vancouver, BC V6T 2A3, Canada
<a href="tel:%28604%29%20222-1047" value="+16042221047" target="_blank" moz-do-not-send="true">+1-604-222-1047x6445</a></pre>
<div class="m_6554660994247985372moz-cite-prefix">On
11/8/17 12:11 PM, journalclub wrote:<br>
</div>
<blockquote type="cite">
<div dir="ltr">
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small"><br>
</div>
<div class="gmail_quote">
<div dir="ltr">
<div><font face="lucida console, sans-serif">
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small;display:inline">TODAY</div>
(WED
<div class="gmail_default"
style="font-family:arial,helvetica,sans-serif;font-size:small;display:inline">
8th</div>
) 3:30PM, Journal + Snack Club, THEORY ROOM,
MOB</font><br>
</div>
<div
style="font-family:arial,helvetica,sans-serif;font-size:small"><span><br>
</span></div>
<div
style="font-family:arial,helvetica,sans-serif;font-size:small"><span>The
proto-paper for this week's journal club is
titled "Measurement of the neutron lifetime
using an asymmetric magneto-gravitational
trap and in situ detection", and is
attached. It can also be found here: </span><a
href="https://arxiv.org/abs/1707.01817"
target="_blank" moz-do-not-send="true">https://arxiv.org/abs/1<wbr>707.01817</a><span> .
The paper details a major result from the
UCNtau collaboration.</span><br>
<br>
<br>
<span>Questions for reading and/or discussion:
</span><br>
<br>
<span>* What are "quasi-trapped" neutrons, and
why is it important to avoid them?</span><br>
<span>* Why use both a magnetic Halbach array
and an additional magnetic holding field?</span><br>
<span>* Why pair the runs up into sets of long
and short runs?</span><br>
<span>* Is this result good enough to extract
any further constraints on cosmological or
BSM physics? </span><br>
<span>* Does this result actually resolve the
long held discrepancy between neutron
lifetime measurement techniques?</span></div>
</div>
</div>
<br>
</div>
<br>
<fieldset
class="m_6554660994247985372mimeAttachmentHeader"></fieldset>
<br>
<pre>______________________________<wbr>_________________
Isac-Journal-Club mailing list
<a class="m_6554660994247985372moz-txt-link-abbreviated" href="mailto:Isac-Journal-Club@lists.triumf.ca" target="_blank" moz-do-not-send="true">Isac-Journal-Club@lists.<wbr>triumf.ca</a>
<a class="m_6554660994247985372moz-txt-link-freetext" href="http://lists.triumf.ca/mailman/listinfo/isac-journal-club" target="_blank" moz-do-not-send="true">http://lists.triumf.ca/<wbr>mailman/listinfo/isac-journal-<wbr>club</a>
</pre>
</blockquote>
<br>
</div>
</blockquote>
</div>
</div>
</blockquote>
<br>
</blockquote>
<br>
</body>
</html>