1. Hall A collaboration meeting, May 17-18, 2004, 1 Operated by the Southeastern Universities Research Association for the U.S. Department Of Energy Thomas Jefferson National Accelerator Facility HALL-A STATUS REPORT Hall A Collaboration Meeting December 16-17, 2004 K EES DE J AGER J EFFERSON L ABORATORY

2. Hall A collaboration meeting, May 17-18, 2004, 2 Operated by the Southeastern Universities Research Association for the U.S. Department Of Energy Thomas Jefferson National Accelerator Facility GENERAL INFORMATION Significant progress on archival papers –E91-010HAPPEx-I published –E89-003 16 O(e,ep) published –E99-117A 1 n published –E95-001G M n circulating –E93-027G E p 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 collaboration meeting, May 17-18, 2004, 3 Operated by the Southeastern Universities Research Association for the U.S. Department Of Energy Thomas Jefferson National Accelerator Facility Hall A Approved Proposals PAC 4-26 31 Experiments completed Backlog ~3.5 years (annual average for Hall A is ~90 days)

4. Hall A collaboration meeting, May 17-18, 2004, 4 Operated by the Southeastern Universities Research Association for the U.S. Department Of Energy Thomas Jefferson National Accelerator Facility Proposals submitted to PAC27. Jeopardy PR05-002 +n -> π - p in 2 H, 4 He and 12 CD. Dutta11.5 PR05-004A(Q) at low Q in ed elastic scatteringR. Gilman6. New PR05-007Parity violating DIS in polarized eDX. Zheng46 PR05-009High-resolution study of nK + B. Wojtsekhowski23 PR05-010Structure of Roper resonanceS. Sirca14.5 PR05-013Search for bound + NucleiR. Feuerbach9 PR05-014Neutron-tagged proton structureN. Liyanage18 PR05-015Traget SSA in quasi-elastic polarized 3 HeT. Averett28 PR05-016Measurement of F 2 n /F 2 p from 3 H/ 3 HeM. Petratos35. Total191. Allocation(35+5+8)48

5. Hall A collaboration meeting, May 17-18, 2004, 5 Operated by the Southeastern Universities Research Association for the U.S. Department Of Energy Thomas Jefferson National Accelerator Facility 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. Hall A collaboration meeting, May 17-18, 2004, 6 Operated by the Southeastern Universities Research Association for the U.S. Department Of Energy Thomas Jefferson National Accelerator Facility Scheduled Experiments in Hall A ExpTitleSpokespersons Nov/DecInstallation of Big Bite Jan-AprE01-015Studying the Internal Small-Distance Structure of W. Bertozzi, E. Piasetzky, Nuclei via the Triple Coincidence 12 C(e,epN)J. Watson, S. Wood MayInstallation of septa Jun E94-107High-Resolution 1p-Shell Hypernuclear Spectroscopy S. Frullani, F. Garibaldi Jul-NovE99-115Constraining the Nuclear Strangeness Radius in PVESK. Kumar, D. Lhuillier E00-114Parity Violation from 4 He at Low Q 2 : D. Armstrong, R. Michaels A Clean Measurement of Rho Dec-FebInstallation of polarized 3 He target and Big Bite Mar-MayE02-013Measurement of G E n at High Q 2 G. Cates, K. McCormick, B. Reitz, B. Wojtsekhowski JunBack to standard configuration E04-018Elastic scattering off 3, 4 He E03-105Polarization transfer in 4 He(e,ep) E02-004A(Q) at low Q E03-101Hard photodisintegration of a proton pair

7. Hall A collaboration meeting, May 17-18, 2004, 7 Operated by the Southeastern Universities Research Association for the U.S. Department Of Energy Thomas Jefferson National Accelerator Facility

8. Hall A collaboration meeting, May 17-18, 2004, 8 Operated by the Southeastern Universities Research Association for the U.S. Department Of Energy Thomas Jefferson National Accelerator Facility 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!