[Jlab-seminars] Physics Seminar Announcement

[Luci Collins]

*Physics Seminar
Friday, June 11, 2010
11:00AM
CEBAF Center AUD.
Cookies & Coffee at 10:45

**Wick Haxton
Lawerence Berkeley National Lab and University *

*"Solar Neutrinos and the Planets" *

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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