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HALL-A STATUS REPORT

HALL-A STATUS REPORT. Hall A Collaboration Meeting December 16-17, 2004 K EES DE J AGER J EFFERSON L ABORATORY. GENERAL INFORMATION. Significant progress on archival papers E91-010 HAPPEx-I published E89-003 16 O(e,e’p) published E99-117 A 1 n published E95-001 G M n circulating

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HALL-A STATUS REPORT

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  1. HALL-A STATUS REPORT Hall A Collaboration Meeting December 16-17, 2004 KEESDE JAGER JEFFERSON LABORATORY

  2. GENERAL INFORMATION • Significant progress on archival papers • E91-010 HAPPEx-I published • E89-003 16O(e,e’p) published • E99-117 A1n published • E95-001 GMn circulating • E93-027 GEp resubmission circulating • Waiting on E91-026 (A and B) • Central repository of figures on Hall A webpage Please submit figures of all publications to Rob Feuerbach • Physics Division Xmas party: Tuesday, Dec 21 at 1 pm (sign up with Heather 5$) • Borrel: ARC 231-233, Thursday 5:30-8 p.m. • sign up with Heather • last persons clean up before leaving

  3. Hall A Approved Proposals PAC 4-26 • 31 Experiments completed • Backlog ~3.5 years (annual average for Hall A is ~90 days)

  4. Proposals submitted to PAC27 • Jeopardy PR05-002 g+n -> π-p in 2H, 4He and 12C D. Dutta 11.5 PR05-004 A(Q) at low Q in ed elastic scattering R. Gilman 6 • New PR05-007 Parity violating DIS in polarized eD X. Zheng 46 PR05-009 High-resolution study of nK+ B. Wojtsekhowski 23 PR05-010 Structure of Roper resonance S. Sirca 14.5 PR05-013 Search for bound q+ Nuclei R. Feuerbach 9 PR05-014 Neutron-tagged proton structure N. Liyanage 18 PR05-015 Traget SSA in quasi-elastic polarized 3He T. Averett 28 PR05-016 Measurement of F2n/F2p from 3H/3He M. Petratos 35 • Total 191 • Allocation (35+5+8) 48

  5. Septum Magnets • Right septum can run at 60-65 µA • Left septum quenched at 30 µA • After opening up the upper half, paper tissue and tape was found (and removed) in the helium lines • It will be cooled down during the February down • A sweep magnet is being constructed for HAPPEx which is expected to reduce heat deposition by factor 2-4 • Next test: can septa run with 100 µA on 20 cm LH2 (for HAPPEx)?

  6. Scheduled Experiments in Hall A ExpTitleSpokespersons Nov/Dec Installation of Big Bite Jan-Apr E01-015 Studying the Internal Small-Distance Structure of W. Bertozzi, E. Piasetzky, Nuclei via the Triple Coincidence 12C(e,e’pN) J. Watson, S. Wood May Installation of septa Jun E94-107 High-Resolution 1p-Shell Hypernuclear Spectroscopy S. Frullani, F. Garibaldi Jul-Nov E99-115 Constraining the Nuclear Strangeness Radius in PVES K. Kumar, D. Lhuillier E00-114 Parity Violation from 4He at Low Q2: D. Armstrong, R. Michaels A Clean Measurement of Rho Dec-Feb Installation of polarized 3He target and Big Bite Mar-May E02-013 Measurement of GEn at High Q2 G. Cates, K. McCormick, B. Reitz, B. Wojtsekhowski Jun Back to standard configuration E04-018 Elastic scattering off 3,4He E03-105 Polarization transfer in 4He(e,e’p) E02-004 A(Q) at low Q E03-101 Hard photodisintegration of a proton pair

  7. Summary • Hall A research program vibrant • Many exciting new results • Good progress on archival publications • Septum magnets are (finally!) operational • Scheduling for next five years will be difficult • CD-0 for 12 GeV approved, but next 4-6 months essential to obtain CD-1 approval • Keep up the good work!

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