Systematic resolution study of the CEBAF Hall C spectrometers — HMS and SOS

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In this paper we present a systematic study of the momentum resolution of the CEBAF Hall C spectrometers. These are the High Momentum Spectrometer (HMS) and Short Orbit Spectrometer (SOS). This systematic study enables us to point out the dominating sources of the spectrometer resolutions. It demonstrates that such a systematic analysis can provide the information required to optimize the performance of an existing spectrometer system or the design of a new spectrometer system.

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A measurement of the pi0 electroproduction cross section via the process 1H(e, e'p)pi0 has been made in the momentum transfer region 6.3 GeV < Q2 < 7.8 GeV and for hadronic invariant masses from pion threshold up to 1.4 GeV. The information contained in the differential cross section is used to probe the Delta resonance region where transition form factors such as G*M(Q2) can be extracted. The data will be used to extract the ratio of electric quadrupole to magnetic dipole Delta excitation amplitudes, (E2)/(M1).
The strangeness electroproduction experiments, just starting to take data at TJNAF, are very promising for giving very useful information to understand the nuclear and nucleonic structure and reaction mechanism. The experimental program on hypernuclei already approved concerns few body, light nuclei and heavy nuclei. It will be possible to investigate these hypernuclear systems for the first time by photo- and electro- induced reactions, allowing to obtain very useful information such as Λ-N interaction and weak interaction in the nuclear medium in a complementary way with respect to what can be done with hadron probes.
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A pioneering experiment in Lambda hypernuclear spectroscopy, undertaken at the Thomas Jefferson National Accelerator Facility (Jlab), was recently reported. The experiment used the high- precision, continuous electron beam at Jlab, and a special arrangement of spectrometer magnets to measure the spectrum from {nat}C and 7Li targets using the (e,e' K+)reaction. The 12B hypernuclear spectrum was previously published. This experiment is now reported in more detail, with improved results for the 12B hypernuclear spectrum. In addition, unpublished results of the 7He hypernuclear spectrum are also shown. This later spectrum indicates the need for a more detailed few-body calculation of the hypernucleus and the reaction process. The success of this experiment demonstrates that the (e,e'K+) reaction can be effectively used as a high resolution tool to study hypernuclear spectra, ant its use should be vigorously pursued. Comment: 24 pages, 10 figures
CEBAF Basic Experimental Equipment
  • References C Ii Pi
  • R Yan
  • J Carlini
  • S Napolitano
  • Wood
References [II PI [31 [41 Conceptual Design Report, CEBAF Basic Experimental Equipment. April 13, 1990. C. Yan. R. Carlini, J. Napolitano, and S. Wood. CEBAF-R-92-002 (1992).