Phys. Rev. Lett.
99,
052501
(2007)
[5 pages]
High Resolution Spectroscopy of Λ12B by Electroproduction
M. Iodice et al. Jefferson Lab Hall A Collaboration
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M. Iodice1, F. Cusanno2, A. Acha3, P. Ambrozewicz3, K. A. Aniol4, P. Baturin5, P. Y. Bertin6, H. Benaoum7, K. I. Blomqvist8, W. U. Boeglin9, H. Breuer9, P. Brindza10, P. Bydžovský11, A. Camsonne6, C. C. Chang9, J.-P. Chen10, Seonho Choi12, E. A. Chudakov10, E. Cisbani13, S. Colilli13, L. Coman3, B. J. Craver14, G. De Cataldo15, C. W. de Jager10, R. De Leo15, A. P. Deur14, C. Ferdi6, R. J. Feuerbach10, E. Folts10, R. Fratoni13, S. Frullani13, F. Garibaldi13, O. Gayou16, F. Giulani13, J. Gomez10, M. Gricia13, J. O. Hansen10, D. Hayes17, D. W. Higinbotham10, T. K. Holmstrom18, C. E. Hyde17,6, H. F. Ibrahim17, X. Jiang5, L. J. Kaufman19, K. Kino20, B. Kross10, L. Lagamba15, J. J. LeRose10, R. A. Lindgren14, M. Lucentini13, D. J. Margaziotis4, P. Markowitz3, S. Marrone15, Z. E. Meziani12, K. McCormick5, R. W. Michaels10, D. J. Millener21, T. Miyoshi22, B. Moffit18, P. A. Monaghan16, M. Moteabbed3, C. Muñoz Camacho23, S. Nanda10, E. Nappi15, V. V. Nelyubin14, B. E. Norum14, Y. Okasyasu22, K. D. Paschke19, C. F. Perdrisat18, E. Piasetzky24, V. A. Punjabi25, Y. Qiang16, B. Raue3, P. E. Reimer26, J. Reinhold3, B. Reitz10, R. E. Roche27, V. M. Rodriguez28, A. Saha10, F. Santavenere13, A. J. Sarty29, J. Segal10, A. Shahinyan30, J. Singh14, S. Širca31, R. Snyder14, P. H. Solvignon12, M. Sotona11, R. Subedi32, V. A. Sulkosky18, T. Suzuki22, H. Ueno33, P. E. Ulmer17, G. M. Urciuoli2, P. Veneroni13, E. Voutier34, B. B. Wojtsekhowski10, Y. Ye35, X. Zheng26, S. Zhou36, and C. Zorn10 (Jefferson Lab Hall A Collaboration)
1Istituto Nazionale di Fisica Nucleare, Sezione di Roma Tre, I-00146 Roma, Italy
2Istituto Nazionale di Fisica Nucleare, Sezione di Roma1, Piazza Aldo Moro, Rome, Italy
3Florida International University, Miami, Florida 33199, USA
4California State University, Los Angeles, Los Angeles, California 90032, USA
5Rutgers, The State University of New Jersey, Piscataway, New Jersey 08855, USA
6Université Blaise Pascal/IN2P3, F-63177 Aubière, France
7Syracuse University, Syracuse, New York 13244, USA
8Universität Mainz, Mainz, Germany
9University of Maryland, College Park, Maryland 20742, USA
10Thomas Jefferson National Accelerator Facility, Newport News, Virginia 23606, USA
11Nuclear Physics Institute, Řež near Prague, Czech Republic
12Temple University, Philadelphia, Pennsylvania 19122, USA
13Istituto Nazionale di Fisica Nucleare, Sezione di Roma1, gruppo collegato Sanità, and Istituto Superiore di Sanitá,I-00161 Roma, Italy
14University of Virginia, Charlottesville, Virginia 22904, USA
15Istituto Nazionale di Fisica Nucleare, Sezione di Bari and University of Bari, I-70126 Bari, Italy
16Massachussets Institute of Technology, Cambridge, Massachusetts 02139, USA
17Old Dominion University, Norfolk, Virginia 23508, USA
18College of William and Mary, Williamsburg, Virginia 23187, USA
19University of Massachusetts Amherst, Amherst, Massachusetts 01003, USA
20Research Center for Nuclear Physics, Osaka University, Ibaraki, Osaka 567-0047, Japan
21Brookhaven National Laboratory, Upton, New York 11973, USA
22Tohoku University, Sendai, 980-8578, Japan
23CEA Saclay, DAPNIA/SPhN, F-91191 Gif-sur-Yvette, France
24School of Physics and Astronomy, Sackler Faculty of Exact Science, Tel Aviv University, Tel Aviv 69978, Israel
25Norfolk State University, Norfolk, Virginia 23504, USA
26Argonne National Laboratory, Argonne, Illinois 60439, USA
27Florida State University, Tallahassee, Florida 32306, USA
28University of Houston, Houston, Texas 77204, USA
29St. Mary’s University, Halifax, Nova Scotia, Canada
30Yerevan Physics Institute, Yerevan, Armenia
31Department of Physics, University of Ljubljana, Slovenia
32Kent State University, Kent, Ohio 44242, USA
33Yamagata University, Yamagata 990-8560, Japan
34LPSC, Université Joseph Fourier, CNRS/IN2P3, INPG, F-38026 Grenoble, France
35University of Science and Technology of China, Hefei, Anhui, China
36China Institute of Atomic Energy, Beijing, China
Received 23 May 2007; published 1 August 2007
An experiment measuring electroproduction of hypernuclei has been performed in hall A at Jefferson Lab on a 12C target. In order to increase counting rates and provide unambiguous kaon identification two superconducting septum magnets and a ring imaging Cherenkov detector were added to the hall A standard equipment. An unprecedented energy resolution of less than 700 keV FWHM has been achieved. Thus, the observed Λ12B spectrum shows for the first time identifiable strength in the core-excited region between the ground-state s-wave Λ peak and the 11 MeV p-wave Λ peak.
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.052501
DOI:
10.1103/PhysRevLett.99.052501
PACS:
21.80.+a, 21.60.Cs, 25.30.Rw, 27.20.+n
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