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Hall A Status Report: December 2003 Collaboration Meeting Summary

This report summarizes the key developments from the Hall A Collaboration Meeting held on December 11-12, 2003, at Jefferson Laboratory. Highlights include the completion of annual reports, office assignments, and the status of ongoing and scheduled experiments. The report also outlines the backlog of experiments, recent and future proposals to PAC-25, and the status of new equipment installations, including septum magnets and cryotarget systems. It emphasizes the need for new student recruitment and provides insights into recent publications and completed experiments in Hall A.

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Hall A Status Report: December 2003 Collaboration Meeting Summary

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  1. HALL-A STATUS REPORT Hall A Collaboration Meeting December 11-12, 2003 KEESDE JAGER JEFFERSON LABORATORY

  2. 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 231-233, Thursday 5:30-8 p.m. • sign up with Heather • last persons clean up before leaving

  3. Hall A Approved Proposals PAC 4-24 • 29 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

  4. PROPOSALS to PAC-25 • PR04-002 Hadronization in Nuclei by Deep Inelastic Electron Scattering • PR04-007 Precision Measurement of the Electroproduction of πo near Threshold: a Test of Chiral QCD Dynamics • PR04-011 Photoproduction of q+ via the g + d -> q+ + L Reaction • PR04-012 High-resolution Study of the 1540 Exotic State • PR04-015 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 • PR04-018 Elastic Electron Scattering off 3He and 4He at Large Momentum Transfers • Allocation: 102 days (30 + 72 jeopardy) for 147 requested

  5. LETTERS of INTENT to PAC-25 • LOI-04-001 Extration of GEp from a Double-Polarization Measurement of Two-body 3He Break-up • LOI-04-002 Measurement of the Spin and Parity of the Exotic Q+ via n(g,K-K+n) Reaction • LOI-04-004 Determining the Nature of the Q+ using Polarizaation Asymmetries • LOI-04-006 Measurement of the Q2-Dependence of the Axial-vector and Pseudoscalar Nucleon Form Factors from Q2 = 1 to 3 (GeV/c)2

  6. 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

  7. Scheduled Experiments in Hall A ExpTitleSpokespersons 2003 Sep-Dec Installation of waterfall target, RICH detector and second septum magnet 2004 Jan/FebE94-107 High-Resolution 1p-Shell Hypernuclear Spectroscopy S. Frullani, F. Garibaldi, in the Valence Quark Region J. LeRose, P. Markowitz, T. Saito Mar/Apr Installation of cryotarget May-Jul 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 Jul/Aug Removal of septa, installation of DVCS Aug-Oct E00-110 Deeply Virtual Compton Scattering at 6 GeV P. Bertin, C. Hyde-Wright, E03-106 DVCS on neutron R. Ransome, F. Sabatié Oct/Nov Installation of Big Bite Dec/Jan 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

  8. Publications (incl. submissions) in 2003 • S. Strauch et al., PRL 91, 052301 (2003), Polarization transfer in the 4He(e,e’p)3H reaction up to Q2 = 2.6 (GeV/c)2 • L.Y. Zhu et al., PRL 91, 022003 (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 A1n and spin-flavor decomposition in the valence quark region • M. Amarian et al., PRL accepted, Q2 evolution of the neutron spin structure moments using a 3He target • W. Xu et al., PRC 67, 012201R (2003), PWIA Extraction of the neutron magnetic form factor from quasi-elastic polarized 3He(e,e’) at Q2= 0.3 to 0.6 (GeV/c)2 • X. Jiang et al., PRC 67, 028201 (2003), Search for neutral baryon resonances below pion threshold • D. Dutta et al., PRC 68, 021001 (2003), Nuclear transparency with the gn -> p-p process in 4He • 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 Q2=3.5 GeV2 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

  9. ARCHIVAL PAPERS • E93-027: GEp/GMp 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(Q2) and B(Q2) for the deuteron • E95-001: inclusive quasi-elastic scattering from 3He • E89-003: 16O(e,e’p) draft circulating • E91-010: HAPPEX draft circulating

  10. 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!

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