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The Lead Radius Experiment ("PREX"), experiment number E06002, uses the parity violating weak neutral interaction to probe the neutron distribution in a heavy nucleus, namely 208Pb, thus measuring the RMS neutron radius to 1% accuracy, which has an important impact on nuclear theory.

Spokespersons: Krishna Kumar (U. Mass), Paul Souder (Syracuse), Robert Michaels (JLab), Guido Urciuoli (INFN).

• See also http://hallaweb.jlab.org/parity/prex

Proposal and Updates

• 2005 Latest Proposal Update (Postscript), and Same, PDF.
• 2002 Earlier Proposal Update
• Original Proposal (Dec 1999).

Related Physics Info

• Paper on Parity Violating Neutron Densities published in Phys. Rev. C63, 025501 (2001). Cited 100 times according to SPIRES (Oct 2008).
• 1-Page Experiment Summary for the Public Postscript or PDF
• EINN 2005 Poster about PREX (powerpoint).
• References from C. Horowitz (needs to be updated).
• The 2008 PREX workshop
  • List of 2008 PREX Workshop talks.
  • Here is C. Horowitz's page on the workshop.
• The Trento 2000 Workshop on Parity Violation.

Status and Plans

• A work list   (updated May, 2009)   which supercedes Paul Souder's old work list necessary to perform the experiment. Schedule is March 2010 !
• An index of Meeting Minutes and Talks
• Working on a new Monte Carlo.
• Here are recent (Dec 5, 2007) diagrams of the 18-bit ADC   and the somewhat older schematic from Fernando Barbosa.
• Here is Paul's note on slits for transverse asymmetry systematic (March, 2009).
• SEPTUM
  • Here is a Test plan for Septum magnet to be done in Nov 2009 .
  • Some drawings of the 5 degree septum   courtesy M. Hodges.   See also sept*.pdf in   pics
• COLLIMATOR
  • Overview of collimator to put in the mouth of Q1.
  • Some specs for collimator to help engineer it.
  • Possible way to stop 2-bounce photons
  • The specification to taper the sides to reduce slit scattering.
• TARGET
  • Oct 2009   Proposed target ladder:
    • During the   optics and calibration phase
    • During the   production mode
  • Target info for the Jan 2008 test run.
  • Here are Design Drawings from J. Miller.   And here are assembly pics (was for the Jan 2008 test run)
  • Early tests Pb target.   See diagram of target   and   writeup about test (postscript)   and same, PDF
• Polarimetry is crucial.
  • Here is a specification for Moller FADC DAQ.
  • In 2003 JLab held a Polarimetry Workshop
  • There is an idea to use atomic hydrogen polarimetry.
  • Here is a draft of plans to upgrade   the   Compton polarimeter.
• In Nov 2005 we had a 2 day run to test all aspects of the experiment at ~850 MeV.   Results were explained in the 2005 propsal update (see talks, below).

Talks (including seminars and PAC Defenses)

• Here was the recent PREX workshop 2008 held at JLAB.
• Here are some talks about PREX at workshops, etc.
• An index of Collaboration Meetings and Weekly Meetings   plus some older stuff.

Slides

• Here are some old transparencies.

External Links

• PREX experiment web site
• 2008 PREX Workshop

Contributing to this PREX wiki

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