Measurement of nuclear transparency for the A(e,e'pi+) reaction

We have measured the nuclear transparency of the A(e,e'pi+) 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-ra...

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Veröffentlicht in:	Physical review letters 2007-12, Vol.99 (24), p.242502-242502, Article 242502
Hauptverfasser:	Clasie, B, Qian, X, Arrington, J, Asaturyan, R, Benmokhtar, F, Boeglin, W, Bosted, P, Bruell, A, Christy, M E, Chudakov, E, Cosyn, W, Dalton, M M, Daniel, A, Day, D, Dutta, D, El Fassi, L, Ent, R, Fenker, H C, Ferrer, J, Fomin, N, Gao, H, Garrow, K, Gaskell, D, Gray, C, Horn, T, Huber, G M, Jones, M K, Kalantarians, N, Keppel, C E, Kramer, K, Larson, A, Li, Y, Liang, Y, Lung, A F, Malace, S, Markowitz, P, Matsumura, A, Meekins, D G, Mertens, T, Miller, G A, Miyoshi, T, Mkrtchyan, H, Monson, R, Navasardyan, T, Niculescu, G, Niculescu, I, Okayasu, Y, Opper, A K, Perdrisat, C, Punjabi, V, Rauf, A W, Rodriquez, V M, Rohe, D, Ryckebusch, J, Seely, J, Segbefia, E, Smith, G R, Strikman, M, Sumihama, M, Tadevosyan, V, Tang, L, Tvaskis, V, Villano, A, Vulcan, W F, Wesselmann, F R, Wood, S A, Yuan, L, Zheng, X C
Format:	Artikel
Sprache:	eng
Schlagworte:	ALUMINIUM 27 TARGET ATOMIC NUMBER CARBON 12 TARGET CEBAF ACCELERATOR COLOR MODEL COPPER 63 TARGET DEUTERIUM TARGET ELECTROPRODUCTION FINAL-STATE INTERACTIONS FOUR MOMENTUM TRANSFER GEV RANGE 01-10 GOLD 197 TARGET NUCLEAR PHYSICS AND RADIATION PHYSICS PIONS
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Zusammenfassung:	We have measured the nuclear transparency of the A(e,e'pi+) 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 (sigmaA/sigmaH) from data to a model of pion-electroproduction from nuclei without pi-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.
ISSN:	0031-9007 1079-7114
DOI:	10.1103/PhysRevLett.99.242502