Measurement of Nuclear Transparency for the A(e,e{sup '}{pi}{sup +}) Reaction

Journal Article · Fri Dec 14 04:00:00 EST 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.99.242502· OSTI ID:21024566

Clasie, B; Seely, J ^[1]; Qian, X; Kramer, K ^[2]; Arrington, J; El Fassi, L; Zheng, X C ^[3]; Asaturyan, R; Mkrtchyan, H; Navasardyan, T; Tadevosyan, V ^[4]; Benmokhtar, F ^[5]; Boeglin, W; Markowitz, P ^[6]; Bosted, P; Bruell, A; Chudakov, E; Ent, R; Fenker, H C; Gaskell, D ^[7]

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1. Laboratory for Nuclear Science, Massachusetts Institute of Technology, Cambridge, Massachusetts (United States)
2. Triangle Universities Nuclear Laboratory, Duke University, Durham, North Carolina (United States)
3. Argonne National Laboratory, Argonne, Illinois (United States)
4. Yerevan Physics Institute, Yerevan (Armenia)
5. University of Maryland, College Park, Maryland (United States)
6. Florida International University, Miami, Florida (United States)
7. Thomas Jefferson National Laboratory, Newport News, Virginia (United States)

We have measured the nuclear transparency of the A(e,e{sup '}{pi}{sup +}) process in {sup 2}H, {sup 12}C, {sup 27}Al, {sup 63}Cu, and {sup 197}Au targets. These measurements were performed at the Jefferson Laboratory over a four momentum transfer squared range Q{sup 2}=1.1 to 4.7 (GeV/c){sup 2}. The nuclear transparency was extracted as the super-ratio of ({sigma}{sub A}/{sigma}{sub H}) from data to a model of pion-electroproduction from nuclei without {pi}-N final-state interactions. The Q{sup 2} 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.

• OSTI ID: 21024566
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 99; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
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
PIONS