Oscar A. Rondon's Home Page
Principal Scientist
INPP - INSTITUTE OF NUCLEAR AND PARTICLE PHYSICS, University
of Virginia.
A Very Brief "Introduction to Nucleon Spin Physics":
Nucleon structure as revealed by polarized lepton (electrons, muons, neutrinos)
scattering on polarized nuclei.
Cartoon of a nucleon. Click here
to see more details
The quarks and gluons (= PARTONS) are confined inside the nucleon by
the strong force. This force binds the partons more strongly a low energies
than at high energies. At very high energies the partons behave like free
particles, without interactions (asymptotic freedom).
To view an indicator of how asymptotic freedom sets in, click on the
plot
of alphaS. The plot displays the strong coupling constant
as function of Q, the momentum transferred from the incident particle
to the target.
Oscar A. Rondon, co-spokesman and proposal author.
1st. Collaboration meeting 11/16/01: Presentations
2nd. Collaboration meeting 12/06/02: Presentations
- Update document in gzip PS (.ps.gz) format
here.
- Original proposal in gzip PS (.ps.gz) format
here.
Workshop
on "Testing QCD through Spin Observables in Nuclear Targets",
Charlottesville, VA April 18-20, 2002
Oscar A. Rondon, "Effective Nucleon Polarization in Polarized Targets",
Abstract
in pdf format, Presentation
in HTML format
DIS 2001 , Bologna, Italy
Oscar A. Rondon, "The transverse spin structure of the nucleon measured
in SLAC experiments E155/E155x, Presentation
in
HTML format
Corrections to Spin Structure Asymmetries Measured in Nuclear Polarized
Targets
Oscar A. Rondon
Institute of Nuclear and Particle Physics, University of Virginia, Charlottesville,
Virginia 22901
(Published in Phys. Rev. C60:035201,1999 )
ABSTRACT
The nucleon spin structure functions have been extracted from measurements
of asymmetries in deep inelastic scattering of polarized leptons
on polarized nuclei \cite{EMC,E142,E143,SMC,E154,hermes,E155}. The polarized
nuclei present in practical targets: H, $^2$H, ^3$He, $^{14}$N, $^{15}$N,
$^6$Li and $^7$Li, are, with the exception of hydrogen, systems of bound
nucleons, some of which can attain significant degrees of alignment. All
the aligned nucleons contribute to the asymmetries. The contributions of
each nuclear species to the asymmetry have to be carefully determined,
before a reliable value for the net nucleon asymmetry is obtained. For
this purpose, the spin component of the nuclear angular momentum for every
nuclear state and the probability of each state have to be known with sufficient
accuracy. In this paper I discuss the basic corrections used to estimate
the contributions of the different nuclei, with emphasis on the A = 6 and
7 Li isotopes present in the Li$^2$H polarized target used during SLAC
Experiment 155 to study the deuteron spin structure.
Full PostScript
text.
The dilution factor for lithium deuteride target in SLAC E155.
This is a PostScript version of the (updated) transparencies on the subject
presented at the E155 collaboration meeting at SLAC on 02/23/98:
pdf
version of LiD dilution factor
Neutron electric form factor GEn (JLab experiment E93-026)
GEn-related technical notes
Angular dependence
of asymmetry
Sensitivity
of asymmetry to approximations
F.o.M.
for GEp
GEp,n by
absolute cross sections
Kinematics
summary for GEn
All
GEn runs database DBF IV format
Summary
of hclog entries on shielding for GEn Compressed PostScript:
Download and print.
(Can be viewed/printed directly with GSview 2.5 or later, available
from http://www.cs.wisc.edu/~ghost/gsview/
for OS/2
Warp; MS-Windows 3.x, 95, 98, NT. )
Associated note on shielding configurations here
.
Neutron Detector
Lead Shield
GEn TN # 2000-10
AedV for all
combinations of beam and target polarizations
SLAC Experiment 155x: transverse nucleon spin structure function
TN 2001-XX:
Asymmetries
in e-nucleon DIS Inclusive Polarized Scattering Including Electroweak Interference.
LINKS
My e-mail address is: or@virginia.edu
This page was last updated 9/24/2002
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