Phys. Rev. Lett.
99,
242502
(2007)
[5 pages]
Measurement of Nuclear Transparency for the A(e,e′π+) Reaction
B. Clasie et al.
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B. Clasie1, X. Qian2, J. Arrington3, R. Asaturyan4, F. Benmokhtar5, W. Boeglin6, P. Bosted7, A. Bruell7, M. E. Christy8, E. Chudakov7, W. Cosyn9, M. M. Dalton10, A. Daniel11, D. Day12, D. Dutta13,2, L. El Fassi3, R. Ent7, H. C. Fenker7, J. Ferrer14, N. Fomin12, H. Gao1,2, K. Garrow15, D. Gaskell7, C. Gray10, T. Horn5,7, G. M. Huber16, M. K. Jones7, N. Kalantarians11, C. E. Keppel7,8, K. Kramer2, A. Larson17, Y. Li11, Y. Liang18, A. F. Lung7, S. Malace8, P. Markowitz6, A. Matsumura19, D. G. Meekins7, T. Mertens20, G. A. Miller17, T. Miyoshi11, H. Mkrtchyan4, R. Monson21, T. Navasardyan4, G. Niculescu14, I. Niculescu14, Y. Okayasu19, A. K. Opper18, C. Perdrisat22, V. Punjabi23, A. W. Rauf24, V. M. Rodriquez11, D. Rohe20, J. Ryckebusch9, J. Seely1, E. Segbefia8, G. R. Smith7, M. Strikman25, M. Sumihama19, V. Tadevosyan4, L. Tang7,8, V. Tvaskis7,8, A. Villano26, W. F. Vulcan7, F. R. Wesselmann23, S. A. Wood7, L. Yuan8, and X. C. Zheng3
1Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
2Triangle Universities Nuclear Laboratory, Duke University, Durham, North Carolina, USA
3Argonne National Laboratory, Argonne, Illinois, USA
4Yerevan Physics Institute, Yerevan, Armenia
5University of Maryland, College Park, Maryland, USA
6Florida International University, Miami, Florida, USA
7Thomas Jefferson National Laboratory, Newport News, Virginia, USA
8Hampton University, Hampton, Virginia, USA
9Ghent University, Ghent, Belgium
10University of the Witwatersrand, Johannesburg, South Africa
11University of Houston, Houston, Texas, USA
12University of Virginia, Charlottesville, Virginia, USA
13Mississippi State University, Mississippi State, Mississippi, USA
14James Madison University, Harrisonburg, Virginia, USA
15TRIUMF, Vancouver, British Columbia, Canada
16University of Regina, Regina, Saskatchewan, Canada
17University of Washington, Seattle, Washington, USA
18Ohio University, Athens, Ohio, USA
19Tohoku University, Sendai, Japan
20Basel University, Basel, Switzerland
21Central Michigan University, Mount Pleasant, Michigan, USA
22College of William and Mary, Williamsburg, Virginia, USA
23Norfolk State University, Norfolk, Virginia, USA
24University of Manitoba, Winnipeg, Manitoba, Canada
25Pennsylvania State University, University Park, Pennsylvania, USA
26Rensselaer Polytechnic Institute, Troy, New York, USA
Received 10 July 2007; revised 23 September 2007; published 14 December 2007
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Physics
Focus
We have measured the nuclear transparency of the A(e,e′π+) process in 2H, 12C, 27Al, 63Cu, and 197Au targets. These measurements were performed at the Jefferson Laboratory over a four momentum transfer squared range Q2=1.1 to 4.7 (GeV/c)2. The nuclear transparency was extracted as the super-ratio of (σA/σH) from data to a model of pion-electroproduction from nuclei without π-N final-state interactions. The Q2 and atomic number dependence of the nuclear transparency both show deviations from traditional nuclear physics expectations and are consistent with calculations that include the quantum chromodynamical phenomenon of color transparency.
© 2007 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.242502
DOI:
10.1103/PhysRevLett.99.242502
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