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<LI> The [http://media4.physics.indiana.edu/%7Echarlie/parity/index.html Trento 2000 Workshop] on Parity Violation.
 
<LI> The [http://media4.physics.indiana.edu/%7Echarlie/parity/index.html Trento 2000 Workshop] on Parity Violation.
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</UL>
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</font>
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== Status and Plans ==
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<font color="Black">
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<UL>
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<li> A [http://hallaweb.jlab.org/parity/prex/worklist.html work list] &nbsp; (updated May, 2009) &nbsp; which supercedes Paul Souder's [http://hallaweb.jlab.org/parity/prex/pb_tasks_0306.pdf old work list] necessary to perform the experiment.  <font color="red">Schedule is March 2010 !</font>
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</li>
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<li> An index of [http://hallaweb.jlab.org/experiment/HAPPEX/minutes.html Meeting Minutes and Talks]
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</li>
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<li> Working on a new [http://hallaweb.jlab.org/parity/prex/hamc Monte Carlo].
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</li>
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<li>
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Here are recent (Dec 5, 2007) [http://hallaweb.jlab.org/parity/prex/adc18 diagrams of the 18-bit ADC] &nbsp; and the somewhat older
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[http://hallaweb.jlab.org/parity/prex/ADC_18bit.pdf schematic] from Fernando Barbosa.
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</li>
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<li>
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Here is Paul's [http://hallaweb.jlab.org/parity/prex/paul_transverse.pdf note on slits for transverse] asymmetry systematic (March, 2009). 
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</li>
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<li> Info about the <font color="blue">Septum</font>
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<ul>
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<li> Here is a [http://hallaweb.jlab.org/parity/prex/prex_magnet.pdf Test plan for Septum] magnet to be done in <font color="blue"> Nov 2009 </font>.
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</li>
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<li> Some [http://www.jlab.org/%7Emhodges drawings of the 5 degree septum] &nbsp; courtesy M. Hodges. &nbsp; See also sept*.pdf in &nbsp;  [http://hallaweb.jlab.org/parity/prex/pics pics]
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</li>
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</ul>
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</li>
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<li> Info about the <font color="blue">Collimator</font>
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<ul>
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<li> Overview of [http://hallaweb.jlab.org/parity/prex/paul_collim.xfig.pdf collimator] to put in the mouth of Q1.
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</li>
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<li> Some [http://hallaweb.jlab.org/parity/prex/paul_collim_spec.xfig.pdf specs for collimator] to help engineer it.
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</li>
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<li> Possible way to [http://hallaweb.jlab.org/parity/prex/photon_top.xfig.pdf stop 2-bounce photons]
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</li>
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<li> The specification to [http://hallaweb.jlab.org/parity/prex/paul_collim_taper.xfig.pdf taper the sides] to reduce slit scattering.
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</li>
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</ul>
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</li>
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<li> Target Info
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<ul>
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<li> <font color="blue">Oct 2009</font> &nbsp; Proposed target ladder:
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<ul>
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<li> During the &nbsp; [http://hallaweb.jlab.org/parity/prex/prex_target_optics.xfig.pdf optics and calibration phase]
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</li>
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<li> During the &nbsp; [http://hallaweb.jlab.org/parity/prex/prex_target.xfig.pdf production mode]
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</li>
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</ul>
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</li>
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<li> [http://hallaweb.jlab.org/parity/prex/prex_tgt.doc Target info] for the Jan 2008 test run.
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</li>
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<li>Here are
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[http://www.jlab.org/%7Emiller/PREX_E06002 Design Drawings from J. Miller]. &nbsp; And here are [http://hallaweb.jlab.org/parity/prex/pics/pbtgt.html assembly pics] (was for the Jan 2008 test run)
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</li>
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<li> Early tests Pb target.  &nbsp; See [http://hallaweb.jlab.org/parity/prex/lead_target.ps diagram of target] &nbsp; and &nbsp; [http://hallaweb.jlab.org/parity/prex/pbtgt_test.ps writeup about test] (postscript) &nbsp; and [http://hallaweb.jlab.org/parity/prex/pbtgt_test.pdf same, PDF]
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</li>
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</ul>
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</li>
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<li> Polarimetry is crucial.
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<ul>
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<li> Here is a [http://hallaweb.jlab.org/parity/prex/mollfadc.pdf specification for Moller FADC] DAQ.
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</li>
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<li> In 2003 JLab held a [http://www.jlab.org/polarimetry/program.html Polarimetry Workshop]
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</li>
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<li> There is an idea to use [http://www.jlab.org/%7Egen/hyd atomic hydrogen polarimetry].
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</li>
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<li> Here is a [http://hallaweb.jlab.org/parity/prex/compton_upgrade.pdf draft of plans to upgrade] &nbsp; the &nbsp; [http://hallaweb.jlab.org/compton Compton polarimeter].
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</li>
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</ul>
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</li>
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<li> In Nov 2005 we had a 2 day run to test all aspects of the experiment at ~850 MeV. &nbsp; Results were explained in the 2005 propsal update (see talks, below).
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</li>
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</UL>
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</font>
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== Talks (including seminars and PAC Defenses==
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<font color="Black">
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<UL>
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<li> Here was the recent [http://conferences.jlab.org/prex/program.html PREX workshop 2008] held at [http://www.jlab.org JLAB].
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</li>
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<li> Here are some [http://hallaweb.jlab.org/parity/prex/prextalks.html talks] about PREX at workshops, etc.
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</li>
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<li> An index of [http://hallaweb.jlab.org/experiment/HAPPEX/minutes.html Collaboration Meetings and Weekly  Meetings] &nbsp; plus some [http://hallaweb.jlab.org/parity/mtg older stuff].
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</li>
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</UL>
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</font>
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== Slides ==
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<font color="Black">
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<UL>
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<LI>
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Here are some [http://hallaweb.jlab.org/parity/prex/oldslides.html old transparencies].
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</LI>
 
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Revision as of 09:11, 28 October 2009

PREX Wiki This page is under construction (Oct 14 2009).


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. The experiment is being performed by the HAPPEX collaboration which has recently completed
experiments E99115 & E00114 -- i.e. HAPPEX II and HAPPEX Helium.



Proposal and Updates

Related Physics Info

Status and Plans


Talks (including seminars and PAC Defenses

Slides

External Links

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