[Jlab-seminars] Physics Seminar Announcement

[Luci Collins]

*Physics Seminar
Wednesday, Apr. 27, 2011
4:00PM
Cebaf Center AUD.
Cookies & Coffee at 3:45PM

**"First Results from PREX" **

**Robert Michaels
Jefferson Lab *

The Lead Parity Experiment PREX ran in the Spring of 2010 in Hall A and 
the results will be presented for the first time.  The experiment 
measures the parity-violating asymmetry in the elastic scattering of 
polarized electrons from a lead nucleus at an energy of 1.06 GeV and a 
scattering angle of 5 degrees.  The Z0 boson that mediates the weak 
interaction couples mainly to neutrons and provides a clean measurement 
of the RMS radius of the neutron distribution in the nucleus.  This 
measurement is a fundamental test of nuclear models and can clearly 
establish whether a neutron skin exists in heavy nuclei. An accurate 
measurement impacts neutron star structure, heavy ion collisions, and 
atomic parity violation measurements. The experiment involves all 
aspects of CEBAF, from the polarized source to the detector, and 
capitalizes on CEBAF's unique strengths for carrying out high-precision 
parity experiments.  In addition to the data, several technical 
challenges will be described, as well as prospects for future 
measurements from lead and other nuclei at Jefferson Lab. *

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