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CLAS Science in the News.<br>
<br>
Thanks to all who built the CLAS and made it run at the highest
luminosity of any large acceptance detector, thanks to the wide open
trigger (electrons only), and thanks to all who where on shift (eg2)
and took all the beautiful data in 2004, and thanks to the machine
operators who managed to get beyond 5 GeV, and thanks to the
diligent data miners, and thanks to DOE who funded all this..... we
have some nice and unexpected results that made it in the newspaper
tomorrow.<br>
<br>
Sometimes the reward comes a decade later! <br>
Keep it all up!<br>
<div class="moz-forward-container"><br>
Volker<br>
<br>
<br>
<br>
-------- Original Message --------
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Subject:
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<td>Daily Press posts article on Science paper</td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Date: </th>
<td>Wed, 22 Oct 2014 16:28:13 -0400 (EDT)</td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">From: </th>
<td>Kandice Carter <a class="moz-txt-link-rfc2396E" href="mailto:kcarter@jlab.org"><kcarter@jlab.org></a></td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">To: </th>
<td>Douglas Higinbotham <a class="moz-txt-link-rfc2396E" href="mailto:doug@jlab.org"><doug@jlab.org></a>, Larry
Weinstein <a class="moz-txt-link-rfc2396E" href="mailto:weinstei@jlab.org"><weinstei@jlab.org></a></td>
</tr>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">CC: </th>
<td>Bob McKeown <a class="moz-txt-link-rfc2396E" href="mailto:bmck@jlab.org"><bmck@jlab.org></a>, Rolf Ent
<a class="moz-txt-link-rfc2396E" href="mailto:ent@jlab.org"><ent@jlab.org></a>, Hugh Montgomery
<a class="moz-txt-link-rfc2396E" href="mailto:mont@jlab.org"><mont@jlab.org></a>, Volker Burkert
<a class="moz-txt-link-rfc2396E" href="mailto:burkert@jlab.org"><burkert@jlab.org></a>, Cynthia Keppel
<a class="moz-txt-link-rfc2396E" href="mailto:keppel@jlab.org"><keppel@jlab.org></a>, Jim Raper <a class="moz-txt-link-rfc2396E" href="mailto:jraper@odu.edu"><jraper@odu.edu></a>,
John Warren <a class="moz-txt-link-rfc2396E" href="mailto:jwarren@jlab.org"><jwarren@jlab.org></a>, deborah magaldi
<a class="moz-txt-link-rfc2396E" href="mailto:magaldi@jlab.org"><magaldi@jlab.org></a></td>
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<div style="font-family: times new roman,new york,times,serif;
font-size: 12pt; color: #000000"><a class="moz-txt-link-freetext" href="http://www.dailypress.com/news/science/dp-nws-protons-neutrons-research-20141023,0,6226102.story">http://www.dailypress.com/news/science/dp-nws-protons-neutrons-research-20141023,0,6226102.story</a><br>
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<h1 style="margin: 10px 0px 0px; padding: 0px; font-size:
24px; color: rgb(6, 54, 64); position: relative;">Jeff Lab
produces new data on nucleon pairings</h1>
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<div class="byline" style="margin: 0px; padding: 0px;
font-size: 11px; float: left;"><span class="byline
bordered" style="display: block;">By <a
moz-do-not-send="true"
href="http://bio.tribune.com/tamaradietrich"
style="font-weight: 700; color: rgb(3, 33, 82)
!important; text-decoration: none;">Tamara
Dietrich</a></span><span class="titleline"
style="display: block;"><a class="moz-txt-link-abbreviated" href="mailto:tdietrich@dailypress.com">tdietrich@dailypress.com</a></span>
<p class="date" style="margin-top: 2px;
margin-bottom: 10px; padding: 0px; color: rgb(213,
83, 23); font-style: italic;"><span
class="dateString" style="display: inline;">October
23, 2014</span></p>
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</span>
<div id="story-body-text" style="margin: 0px; padding:
0px; position: relative;">
<p style="margin-top: 10px; margin-bottom: 10px;
padding: 0px;">It's the mission of physicists to
drill down and study the weirdness of the natural
world, from the subatomic to the galactic.</p>
<p style="margin-top: 10px; margin-bottom: 10px;
padding: 0px;">Now data mining into experiments
conducted at Jefferson Lab in Newport News has
turned up new information about proton and neutron
pairings in heavy nuclei, such as lead and iron,
that will have other physicists tweaking their own
research.</p>
<p style="margin-top: 10px; margin-bottom: 10px;
padding: 0px;">"We knew protons and neutrons paired
up in heavier nuclei — we just didn't know how
much," Doug Higinbotham, a staff scientist at
Jefferson Lab, said Wednesday.</p>
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<p style="margin-top: 10px; margin-bottom: 10px;
padding: 0px;">And since their understanding of such
pairings was imperfect, he said, scientists who
studied them had to work with imperfect
formulations.</p>
<p style="margin-top: 10px; margin-bottom: 10px;
padding: 0px;">"Because calculations are so hard,
people make simple approximations to calculate the
system," said Lawrence Weinstein, a physics
professor at <a moz-do-not-send="true"
class="taxInlineTagLink" id="OREDU0000135"
title="Old Dominion University"
href="http://www.dailypress.com/topic/education/colleges-universities/old-dominion-university-OREDU0000135.topic"
style="font-weight: 700; color: rgb(3, 33, 82)
!important; text-decoration: none;">Old Dominion
University</a> in Norfolk. "This data is saying
the approximation that was made has to be flipped.
Previously we would say neutrons would have
higher-than-average momentum. Now it's saying it's
the other way around, because of the pairing."</p>
<p style="margin-top: 10px; margin-bottom: 10px;
padding: 0px;">The two scientists describe those
pairings as much like boys and girls on a dance
floor, each moving at its own pace or momentum. But
when protons and neutrons pair up in something
called a short-range correlation, their momentum
increases, generating greater speed.</p>
<p style="margin-top: 10px; margin-bottom: 10px;
padding: 0px;">They found this holds true even if
there's a large number of protons and neutrons and
if the number of protons and neutrons is very
different from each other. Lead, for instance, has 1
1/2 neutrons for every proton, yet protons and
neutrons still prefer to seek each other out,
leaving far fewer proton/proton or neutron/neutron
pairings.</p>
<p style="margin-top: 10px; margin-bottom: 10px;
padding: 0px;">"It's easier to figure out pairings
if you just have six of one and six of the other,"
Weinstein said. "But once you start getting a lot —
and lead is (a sum of) 208 protons and neutrons —
the calculations just get too hard."</p>
<p style="margin-top: 10px; margin-bottom: 10px;
padding: 0px;">They say their findings alter some
long-accepted theories about the nucleus, with
implications for ultra-cold atomic gas systems and
neutron stars — which are like a massive nucleus
with 10 times more neutrons than protons.</p>
<p style="margin-top: 10px; margin-bottom: 10px;
padding: 0px;">"What it comes down to is, neutron
stars are really cool," said Weinstein. "They're
fascinating. And we want to understand how big they
can be, how quickly they can cool down, how they
form. And this measurement can affect our
understanding of all of those."</p>
<p style="margin-top: 10px; margin-bottom: 10px;
padding: 0px;">Higinbotham and Weinstein, along with
an international group of scientists, came up with
their findings by analyzing data from an experiment
conducted at the national lab in 2004. The two
co-authored a paper on their work that just appeared
in the online edition of the journal Science, and is
expected to appear soon in the print version.</p>
<p style="margin-top: 10px; margin-bottom: 10px;
padding: 0px;">Jefferson Lab houses a large
underground particle beam accelerator called the
Continuous Electron Beam Accelerator Facility
(CEBAF), which scientists from around the world use
to try to unravel the mysteries of the building
blocks of matter.</p>
<p style="margin-top: 10px; margin-bottom: 10px;
padding: 0px;">Since 2008, the facility has been
undergoing a $338 million renovation to double
CEBAF's energy capacity to 12 GeV, or 12 billion
electron volts, to better understand the basic quark
structure of subatomic particles.</p>
<p style="margin-top: 10px; margin-bottom: 10px;
padding: 0px;"><i>Dietrich can be reached by phone
at 757-247-7892.</i></p>
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