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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/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
- Oct 2009 Proposed target ladder:
- 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
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