Event Title

Session C: APS and AAPT Poster Session - PREX: Cleanly Measuring the Neutron Radius of Lead through Parity Violation

Location

Concourse, Campus Center, University of Massachusetts - Amherst

Event Website

http://blogs.umass.edu/nes2011/

Start Date

18-11-2011 5:40 PM

End Date

18-11-2011 7:00 PM

Description

PREX: Cleanly Measuring the Neutron Radius of Lead through Parity Violation JONATHAN WEXLER, University of Massachusetts Amherst---The neutron radius of neutron rich nuclei contains information pertaining to a broad set of physics applications, such as the equation of state of neutron stars and their cooling by neutrinos, and are a strong constraint on nuclear symmetry energy. However, measurements of these neutron radii are challenging, typically requiring either hadron-nuclei scattering, which introduce theoretical interpretation ambiguities, or parity violating measurements, which require high precision. The PREX experiment, which completed running at Jefferson Lab last year, measured the parity violating helicity-dependent cross section asymmetry of lead through polarized electron scattering and is the first to do so using such a technique. Completed data analysis is statistics limited and has an uncertainty of 3% on the radius. An overview of the experiment itself, the results and their impact, and future approved measurements will be presented.

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Nov 18th, 5:40 PM Nov 18th, 7:00 PM

Session C: APS and AAPT Poster Session - PREX: Cleanly Measuring the Neutron Radius of Lead through Parity Violation

Concourse, Campus Center, University of Massachusetts - Amherst

PREX: Cleanly Measuring the Neutron Radius of Lead through Parity Violation JONATHAN WEXLER, University of Massachusetts Amherst---The neutron radius of neutron rich nuclei contains information pertaining to a broad set of physics applications, such as the equation of state of neutron stars and their cooling by neutrinos, and are a strong constraint on nuclear symmetry energy. However, measurements of these neutron radii are challenging, typically requiring either hadron-nuclei scattering, which introduce theoretical interpretation ambiguities, or parity violating measurements, which require high precision. The PREX experiment, which completed running at Jefferson Lab last year, measured the parity violating helicity-dependent cross section asymmetry of lead through polarized electron scattering and is the first to do so using such a technique. Completed data analysis is statistics limited and has an uncertainty of 3% on the radius. An overview of the experiment itself, the results and their impact, and future approved measurements will be presented.

http://scholarworks.umass.edu/climate_nuclearpower/2011/nov18/13