Hall A collaboration meeting, june 13-15, 2002, 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 11-12, 2003 K EES DE J AGER J EFFERSON L ABORATORY

Hall A collaboration meeting, june 13-15, 2002, 2 Operated by the Southeastern Universities Research Association for the U.S. Department Of Energy Thomas Jefferson National Accelerator Facility GENERAL INFORMATION Hall A 2003 Annual Report ready for distribution (Thanks Kathy!) Heather will distribute download link or request for hardcopy Office space Hall leaders now responsible for office assignments in Trailer City Dennis Skopik will distribute survey on TC occupancy (respond!) Expansion of CEBAF Center on track for completion in spring 2006 Cubicles on 2nd floor of counting house for people on site for experiment and summer students Students: 35 theses completed 32 active students (need new students!) Borrel: ARC , Thursday 5:30-8 p.m. sign up with Heather. last persons clean up before leaving

Hall A collaboration meeting, june 13-15, 2002, 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 Experiments completed Backlog ~4 years (annual average for Hall A is ~90 days) In 2003 Hall A only ran 35 days, but ~100 days scheduled for 2004

Hall A collaboration meeting, june 13-15, 2002, 4 Operated by the Southeastern Universities Research Association for the U.S. Department Of Energy Thomas Jefferson National Accelerator Facility PROPOSALS to PAC-25 PR Hadronization in Nuclei by Deep Inelastic Electron Scattering PR Precision Measurement of the Electroproduction of πo near Threshold: a Test of Chiral QCD Dynamics PR Photoproduction of  + via the  + d ->  + +  Reaction PR High-resolution Study of the 1540 Exotic State PR Precision Measurements of Longitudinal and Transverse Response Functions of Quasi-Elastic Electron Scattering in the Momentum Transfer Range 0.55 GeV/c < q < 0.9 GeV/c PR Elastic Electron Scattering off 3 He and 4 He at Large Momentum Transfers Allocation: 102 days ( jeopardy) for 147 requested

Hall A collaboration meeting, june 13-15, 2002, 5 Operated by the Southeastern Universities Research Association for the U.S. Department Of Energy Thomas Jefferson National Accelerator Facility LETTERS of INTENT to PAC-25 LOI Extration of G E p from a Double-Polarization Measurement of Two-body 3 He Break-up LOI Measurement of the Spin and Parity of the Exotic  + via n( ,K - K + n) Reaction LOI Determining the Nature of the  + using Polarizaation Asymmetries LOI Measurement of the Q 2 -Dependence of the Axial-vector and Pseudoscalar Nucleon Form Factors from Q 2 = 1 to 3 (GeV/c) 2

Hall A collaboration meeting, june 13-15, 2002, 6 Operated by the Southeastern Universities Research Association for the U.S. Department Of Energy Thomas Jefferson National Accelerator Facility Septum Magnets Second magnet arrived early August In both magnets bore size decreased and copper braids installed between coils and yoke Second magnet showed leak in nitrogen system, but assumed small enough to allow normal operation Second (left) magnet cooled down successfully and ramped to ~200 A (same initial value as with first) Optimizing running conditions Right magnet still not cooled down (possibly stuck check valve) Installation complete by this weekend

Hall A collaboration meeting, june 13-15, 2002, 7 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 2003 Sep-DecInstallation of waterfall target, RICH detector and second septum magnet 2004 Jan/FebE94-107High-Resolution 1p-Shell Hypernuclear Spectroscopy S. Frullani, F. Garibaldi, in the Valence Quark RegionJ. LeRose, P. Markowitz, T. Saito Mar/AprInstallation of cryotarget May-JulE99-115Constraining 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 Jul/AugRemoval of septa, installation of DVCS Aug-OctE00-110Deeply Virtual Compton Scattering at 6 GeVP. Bertin, C. Hyde-Wright, E03-106DVCS on neutronR. Ransome, F. Sabatié Oct/NovInstallation of Big Bite Dec/JanE01-015Studying the Internal Small-Distance Structure of W. Bertozzi, E. Piasetzky, Nuclei via the Triple Coincidence 12 C(e,e’pN)J. Watson, S. Wood

Hall A collaboration meeting, june 13-15, 2002, 8 Operated by the Southeastern Universities Research Association for the U.S. Department Of Energy Thomas Jefferson National Accelerator Facility Publications (incl. submissions) in 2003 S. Strauch et al., PRL 91, (2003), Polarization transfer in the 4 He(e,e’p) 3 H reaction up to Q 2 = 2.6 (GeV/c) 2 L.Y. Zhu et al., PRL 91, (2003, Cross-section measurement of charged-pion photoproduction from hydrogen and deuterium X. Zheng et al., PRL accepted, Precision measurement of the neutron spin asymmetry A 1 n and spin- flavor decomposition in the valence quark region M. Amarian et al., PRL accepted, Q 2 evolution of the neutron spin structure moments using a 3 He target W. Xu et al., PRC 67, R (2003), PWIA Extraction of the neutron magnetic form factor from quasi-elastic polarized 3 He(e,e’) at Q 2 = 0.3 to 0.6 (GeV/c) 2 X. Jiang et al., PRC 67, (2003), Search for neutral baryon resonances below pion threshold D. Dutta et al., PRC 68, (2003), Nuclear transparency with the  n ->  - p process in 4 He M. Sargsian et al., J. Phys. G 29, R1 (2003), Hadrons in the nuclear medium D. Higinbotham, PRC submitted, Importance of Coulomb corrections in the extraction of the proton form factors V. Punjabi et al, PRC submitted, Proton elastic form factor ratios to Q 2 =3.5 GeV 2 by polarization transfer J. Alcorn et al., NIM A accepted, Basic instrumentation for Hall A at Jefferson Lab Total to date: PRL/PLB 18, other ref. journals 10 + NIM 7 (plus two submissions) Directly related to approved proposals: PRL/PLB 16, PRC 6 (29 completed exp) Four experiments completed more than 2 years ago without any publication yet

Hall A collaboration meeting, june 13-15, 2002, 9 Operated by the Southeastern Universities Research Association for the U.S. Department Of Energy Thomas Jefferson National Accelerator Facility ARCHIVAL PAPERS E93-027: G E p /G M p by polarization transfer on the proton submitted (waiting for response to referee comments) General Hall A NIM instrumentation paper accepted Other archival papers in preparation E91-026: A(Q 2 ) and B(Q 2 ) for the deuteron E95-001: inclusive quasi-elastic scattering from 3 He E89-003: 16 O(e,e’p) draft circulating E91-010: HAPPEX draft circulating

Hall A collaboration meeting, june 13-15, 2002, 10 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 However, don’t forget archival publications Septum magnets are concern, but required for series of high-impact experiments Scheduling for next five years will be difficult Strong support from DOE/OSC, but no CD0 yet ¤Keep up the good work!