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

Authors :
Clasie B
Qian X
Arrington J
Asaturyan R
Benmokhtar F
Boeglin W
Bosted P
Bruell A
Christy ME
Chudakov E
Cosyn W
Dalton MM
Daniel A
Day D
Dutta D
El Fassi L
Ent R
Fenker HC
Ferrer J
Fomin N
Gao H
Garrow K
Gaskell D
Gray C
Horn T
Huber GM
Jones MK
Kalantarians N
Keppel CE
Kramer K
Larson A
Li Y
Liang Y
Lung AF
Malace S
Markowitz P
Matsumura A
Meekins DG
Mertens T
Miller GA
Miyoshi T
Mkrtchyan H
Monson R
Navasardyan T
Niculescu G
Niculescu I
Okayasu Y
Opper AK
Perdrisat C
Punjabi V
Rauf AW
Rodriquez VM
Rohe D
Ryckebusch J
Seely J
Segbefia E
Smith GR
Strikman M
Sumihama M
Tadevosyan V
Tang L
Tvaskis V
Villano A
Vulcan WF
Wesselmann FR
Wood SA
Yuan L
Zheng XC
Source :
Physical review letters [Phys Rev Lett] 2007 Dec 14; Vol. 99 (24), pp. 242502. Date of Electronic Publication: 2007 Dec 14.
Publication Year :
2007

Abstract

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.

Details

Language :
English
ISSN :
0031-9007
Volume :
99
Issue :
24
Database :
MEDLINE
Journal :
Physical review letters
Publication Type :
Academic Journal
Accession number :
18233444
Full Text :
https://doi.org/10.1103/PhysRevLett.99.242502