15 research outputs found
Gluon Vortices and Induced Magnetic Field in Compact Stars
The natural candidates for the realization of color superconductivity are the
extremely dense cores of compact stars, many of which have very large magnetic
fields, especially the so-called magnetars. In this paper we discuss how a
color superconducting core can serve to generate and enhance the stellar
magnetic field without appealing to a magnetohydrodynamic dynamo mechanism.Comment: To appear in the Proceedings of the VII Latin American Symposium on
Nuclear Physics and Applications. Cusco (Peru) June 200
Measuring Neutrino Oscillations with Nuclear Reactors
Since the first direct observations of antineutrino events by Reines and Cowan in the 1950's [1], nuclear reactors have been an important tool in the study of neutrino properties. More recently, the study of neutrino oscillations has been a very active area of research. The pioneering observation of oscillations by the KamLAND experiment has provided crucial information on the neutrino mixing matrix. New experiments to study the remaining unknown mixing angle are currently under development. These recent studies and potential future developments will be discussed
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Implementation of the Polarized HD target at the Thomas Jefferson National Accelerator Facility
The original goal of this proposal was to study frozen spin polarized targets (HD target and other technologies) and produce a conceptual design report for the implementation of such a target in the HALL B detector of the Thomas Jefferson National Accelerator Facility (JLab). During the first two years of the proposal, we came to the conclusion that the best suited target for JLab was a frozen spin target and helped with the design of such a target. We have not only achieved our original goal but have exceeded it by being involved in the actual building and testing of parts the target. The main reason for this success has been the hiring of a senior research associate, Dr. Oleksandr Dzyubak, who had more than 10 years of experience in the field of frozen spin polarized targets. The current grant has allowed the USC nuclear physics group to strengthen its role in the JLab collaboration and make important contribution to both the detector development and the scientific program
Magnetic Phases in Dense Quark Matter
In this paper I discuss the magnetic phases of the three-flavor color
superconductor. These phases can take place at different field strengths in a
highly dense quark system. Given that the best natural candidates for the
realization of color superconductivity are the extremely dense cores of neutron
stars, which typically have very large magnetic fields, the magnetic phases
here discussed could have implications for the physics of these compact
objects.Comment: Presented at VII Latin American Symposium on Nuclear Physics and
Applications, El Cusco, Peru, June 200
Effects of Neutron Emission on Fragment Mass and Kinetic Energy Distribution from Thermal Neutron-Induced Fission of
The mass and kinetic energy distribution of nuclear fragments from thermal
neutron-induced fission of 235U have been studied using a Monte-Carlo
simulation. Besides reproducing the pronounced broadening in the standard
deviation of the kinetic energy at the final fragment mass number around m =
109, our simulation also produces a second broadening around m = 125. These
results are in good agreement with the experimental data obtained by Belhafaf
et al. and other results on yield of mass. We conclude that the obtained
results are a consequence of the characteristics of the neutron emission, the
sharp variation in the primary fragment kinetic energy and mass yield curves.
We show that because neutron emission is hazardous to make any conclusion on
primary quantities distribution of fragments from experimental results on final
quantities distributions.Comment: 4 pages, 2 figure
Hadronic Resonances from Lattice QCD
The determination of the pattern of hadronic resonances as predicted by
Quantum Chromodynamics requires the use of non-perturbative techniques. Lattice
QCD has emerged as the dominant tool for such calculations, and has produced
many QCD predictions which can be directly compared to experiment. The concepts
underlying lattice QCD are outlined, methods for calculating excited states are
discussed, and results from an exploratory Nucleon and Delta baryon spectrum
study are presented.Comment: 8 pages, VII Latin American Symposium on Nuclear Physics and
Application
Results and Frontiers in Lattice Baryon Spectroscopy
The Lattice Hadron Physics Collaboration (LHPC) baryon spectroscopy effort is
reviewed. To date the LHPC has performed exploratory Lattice QCD calculations
of the low-lying spectrum of Nucleon and Delta baryons. These calculations
demonstrate the effectiveness of our method by obtaining the masses of an
unprecedented number of excited states with definite quantum numbers. Future
work of the project is outlined.Comment: To appear in the proceedings for the VII Latin American Symposium of
Nuclear Physics and Application
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Light Vector Meson Photoproduction off of H at Jefferson Lab and rho-omega Interference in the Leptonic Decay Channel
Recent studies of light vector meson production in heavy nuclear targets has generated interest in {rho}-{omega} interference in the leptonic e{sup +}e{sup -} decay channel. An experimental study of the elementary process provides valuable input for theoretical models and calculations. In experiment E04-005 (g12), high statistics photoproduction data has been taken in Jefferson Lab's Hall B with the Cebaf Large Acceptance Spectrometer (CLAS). The invariant mass spectrum is fitted with two interfering relativistic Breit-Wigner functions to determine the interference phase. Preliminary analysis indicate a measurable {rho}-{omega} interference