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<font color="#000099"><b><font color="#3333ff">Physics Seminar<br>
Friday, June 11, 2010<br>
11:00AM<br>
CEBAF Center AUD.<br>
Cookies & Coffee at 10:45<br>
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</font></b></font><font color="#cc0000"><b><big>Wick Haxton
<br>
Lawerence Berkeley National Lab and University</big> </b></font><br>
<big><br>
</big><b><font color="#cc0000"><big>"Solar Neutrinos and the Planets"</big>
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A problem in the standard solar model has arisen recently -- a
disagreement between tests of surface metalicity (photospheric
absorption lines) and interior metalicity (helioseismology). The
discrepancy has an interesting connection to certain solar neutrino
experiments (Borexino and especially SNO+), which may have the
~Sreach~T necessary to settle this question by directly measuring the
amount of C and N in the Sun~Rs core. Such a measurement is important,
as the discrepancy may be connected to a very interesting stage of
solar system formation -- the last million years of the nebular disk,
when the process of planetary formation scrubbed between 50 and 100
earth masses of metal from the remaining gas. The implications range
from planet hunting to decoding the Sun~Rs structure. I will describe
very recent observations of ~Ssolar twins~T that have made speculations
of a planetary connection particularly interesting.
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