A solid polarized target for high-luminosity experiments Averett, T.D.; Crabb, D.G.; Day, D.B. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
05/1999, Letnik:
427, Številka:
3
Journal Article
Recenzirano
We have built a polarized proton and deuteron target for experiments using intense high-energy electron beams. This system exploits dynamical nuclear polarization of irradiated ammonia in a 5
T ...magnetic field at temperatures near 1
K. We describe the various features and the performance of the target.
Nucleon Radii Sick, I.
Nuclear physics. A,
06/2005, Letnik:
755
Journal Article
Recenzirano
We discuss the determination of accurate
rms-radii for the proton and neutron charge and magnetization densities using the
world data on electron-nucleon elastic scattering. We also address the ...Zemach moment required for the calculation of atomic hyperfine structure.
We present extractions of the nucleon nonsinglet moments utilizing new precision data on the deuteron F 2 structure function at large Bjorkenx determined via the Rosenbluth separation technique at ...Jefferson Lab Experimental Hall C. These new data are combined with a complementary set of data on the proton previously measured in Hall C at similar kinematics and world datasets on the proton and deuteron at lower x measured at SLAC and CERN. The new Jefferson Lab data provide coverage of the upper third of the x range, crucial for precision determination of the higher moments. In contrast to previous extractions, these moments have been corrected for nuclear effects in the deuteron using a new global fit to the deuteron and proton data. The obtained experimental moments represent an order of magnitude improvement in precision over previous extractions using high x data. Moreover, recent exciting developments in lattice QCD calculations provide a first ever comparison of these new experimental results with calculations of moments carried out at the physical pion mass, as well as a new approach that first calculates the quark distributions directly before determining moments.
We present extractions of the nucleon non-singlet moments utilizing new precision data on the deuteron F2 structure function at large Bjorken-x determined via the Rosenbluth separation technique at ...Jefferson Lab Experimental Hall C. These new data are combined with a complementary set of data on the proton previously measured in Hall C at similar kinematics and world data sets on the proton and deuteron at lower x measured at SLAC and CERN. The new Jefferson Lab data provide coverage of the upper third of the x range, crucial for precision determination of the higher moments. In contrast to previous extractions, these moments have been corrected for nuclear effects in the deuteron using a new global fit to the deuteron and proton data. The obtained experimental moments represent an order of magnitude improvement in precision over previous extractions using high x data. Furthermore, recent exciting developments in Lattice QCD calculations provide a first ever comparison of these new experimental results with calculations of moments carried out at the physical pion mass, as well as an innovative approach which first calculates the quark distributions directly before determining moments.
The effects of nucleon-nucleon correlations and color transparency on the final-state interaction of the struck nucleon in electron-nucleus scattering at high-momentum transfer are discussed. The ...results of realistic microscopic calculations show that both the mechanisms lead to an enhancement of the nuclear transparency, and that the correlation effects are larger up to momenta {ital Q}{sup 2}{similar to}4 (GeV/{ital c}){sup 2}.
A new way to look at DIS Sick, I.
Progress in particle and nuclear physics,
2003, 2003-1-00, Letnik:
50, Številka:
2
Journal Article
Recenzirano
We discuss inclusive scattering of electrons from composite systems. In particular, we consider the examples of quasi-elastic electron-nucleus scattering and deep-inelastic electron-nucleon ...scattering, DIS, processes that have much in common. The study of DIS in a way analogous to past studies of quasi-elastic scattering provides new insight, in particular in what concerns the role of final-state interaction and the importance of binding of the constituents.
Precise data on the neutron magnetic form factor Gmn have been obtained with measurements of the ratio of cross sections of D(e,e′n) and D(e,e′p) up to momentum transfers of Q2=0.9 (GeV/c)2. Data ...with typical uncertainties of 1.5% are presented. These data allow for the first time to extract a precise value of the magnetic radius of the neutron.
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