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81.
Zheng X Aniol K Armstrong DS Averett TD Bertozzi W Binet S Burtin E Busato E Butuceanu C Calarco J Camsonne A Cates GD Chai Z Chen JP Choi S Chudakov E Cusanno F Leo RD Deur A Dieterich S Dutta D Finn JM Frullani S Gao H Gao J Garibaldi F Gilad S Gilman R Gomez J Hansen JO Higinbotham DW Hinton W Horn T De Jager CW Jiang X Kaufman L Kelly J Korsch W Kramer K LeRose J Lhuillier D Liyanage N Margaziotis DJ Marie F Markowitz P McCormick K Meziani ZE Michaels R Moffit B Nanda S Neyret D Phillips SK 《Physical review letters》2004,92(1):012004
We have measured the neutron spin asymmetry A(n)(1) with high precision at three kinematics in the deep inelastic region at x=0.33, 0.47, and 0.60, and Q(2)=2.7, 3.5, and 4.8 (GeV/c)(2), respectively. Our results unambiguously show, for the first time, that A(n)(1) crosses zero around x=0.47 and becomes significantly positive at x=0.60. Combined with the world proton data, polarized quark distributions were extracted. Our results, in general, agree with relativistic constituent quark models and with perturbative quantum chromodynamics (PQCD) analyses based on the earlier data. However they deviate from PQCD predictions based on hadron helicity conservation. 相似文献
82.
Abdelhamid Meziani 《Transactions of the American Mathematical Society》2005,357(10):4225-4248
This paper deals with the normalization of elliptic vector fields in the plane that degenerate along a simple and closed curve. The associated homogeneous equation is studied and an application to a degenerate Beltrami equation is given.
83.
Mazouz M Camsonne A Camacho CM Ferdi C Gavalian G Kuchina E Amarian M Aniol KA Beaumel M Benaoum H Bertin P Brossard M Chen JP Chudakov E Craver B Cusanno F de Jager CW Deur A Feuerbach R Fieschi JM Frullani S Garçon M Garibaldi F Gayou O Gilman R Gomez J Gueye P Guichon PA Guillon B Hansen O Hayes D Higinbotham D Holmstrom T Hyde CE Ibrahim H Igarashi R Jiang X Jo HS Kaufman LJ Kelleher A Kolarkar A Kumbartzki G Laveissiere G Lerose JJ Lindgren R Liyanage N Lu HJ Margaziotis DJ Meziani ZE 《Physical review letters》2007,99(24):242501
The present experiment exploits the interference between the deeply virtual Compton scattering (DVCS) and the Bethe-Heitler processes to extract the imaginary part of DVCS amplitudes on the neutron and on the deuteron from the helicity-dependent D(e,e'gamma)X cross section measured at Q2=1.9 GeV2 and xB=0.36. We extract a linear combination of generalized parton distributions (GPDs) particularly sensitive to E_{q}, the least constrained GPD. A model dependent constraint on the contribution of the up and down quarks to the nucleon spin is deduced. 相似文献
84.
Carbon dots for multiphoton bioimaging 总被引:8,自引:0,他引:8
Cao L Wang X Meziani MJ Lu F Wang H Luo PG Lin Y Harruff BA Veca LM Murray D Xie SY Sun YP 《Journal of the American Chemical Society》2007,129(37):11318-11319