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Valeri is, of course, correct (see comment below). The 2-gamma
annihilation is a rare process. The annihilation to mesons is
dominant. Still, one should see clustered e.m. energy as there
should be a number (many?) of pi0's generated, and if the entire
energy (e.m. + hadr.) is contained in the EC the response should
still be about 1.9 GeV, but more distributed in space. <br>
Volker<br>
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<td>Re: [Clas_hadron] DNP13 Abstract</td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">Date: </th>
<td>Mon, 1 Jul 2013 17:02:08 -0400</td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">From: </th>
<td>Valery Kubarovsky <a class="moz-txt-link-rfc2396E" href="mailto:vpk@jlab.org"><vpk@jlab.org></a></td>
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<th align="RIGHT" nowrap="nowrap" valign="BASELINE">To: </th>
<td>burkert <a class="moz-txt-link-rfc2396E" href="mailto:burkert@jlab.org"><burkert@jlab.org></a></td>
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<div>Hi Volker,<br>
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The neutron-antineutron annihilation at rest results in the
production of mesons, primarily pions. It is not
electromagnetic process like in electron-positron
annihilation. The annihilation to photons is very rare
process.<br>
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Regards,<br>
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Valery<br>
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<div class="gmail_quote">On Mon, Jul 1, 2013 at 4:34 PM, burkert
<<a moz-do-not-send="true" href="mailto:burkert@jlab.org">burkert@jlab.org</a>>
wrote:<br>
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<div>Will,<br>
Beautiful! <br>
I wonder if anyone had a look at the energy information
for antineutrons hitting the EC. They will have to lose
the anti-matter energy by annihilating at rest with a
neutron into a pair of 940 MeV photons and leaving in
the calorimeter an e.m. energy cluster of 1.88 GeV. It
would be a direct measurement of the neutron-antineutron
annihilation. <br>
Volker
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On 7/1/13 4:15 PM, Will Phelps wrote:<br>
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<blockquote type="cite"> Hello Volker,
<div>It is a peak in the missing mass spectrum. Here
is a histogram with ~60% of g12's data.</div>
<div>-Will</div>
<div><img src="cid:part2.08050608.09090504@jlab.org"
height="465" width="640"></div>
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<div>On Jul 1, 2013, at 4:05 PM, burkert <<a
moz-do-not-send="true"
href="mailto:burkert@jlab.org">burkert@jlab.org</a>>
wrote:</div>
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<div>Hi Will,<br>
An interesting abstract. I am curious
regarding your anti-neutron. Is it just a
single event at the right mass or do you
see a peak in the missing-mass spectrum? <br>
Volker<br>
<br>
On 7/1/13 3:07 PM, Will Phelps wrote:<br>
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<pre>Hello everyone,
My apologies for this being so late, I just really wanted to try to get this in before the deadline tonight.
Thanks,
-Will Phelps
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