7,491 research outputs found
Direct photons from relativistic heavy ion collisions at CERN SPS and at RHIC
Assuming QGP as the initial state, we have analyzed the direct photon data,
obtained by the WA98 collaboration, in 158 A GeV Pb+Pb collisions at CERN SPS.
It was shown, that for small thermalisation time, two loop rate contribute
substantially to high photons. We argue that for extremely short
thermalisation time scale, the higher loop contribution should not be
neglected. For thermalisation time 0.4 fm or greater, when higher loop
contribution are not substantial, the initial temperature of the QGP is not
large and the system does not produce enough hard photons to fit the WA98
experiment. For initial time in the ranges of 0.4-1.0 fm, WA98 data could be
fitted only if the fluid has initial radial velocity in the range of 0.3-0.5c.
The model was applied to predict photon spectrum at RHIC energy.Comment: 5 pages, 5 figure
Field-Induced Effects of Anisotropic Magnetic Interactions in SrCu2(BO3)2
We observed a field-induced staggered magnetization in the 2D frustrated
dimer-singlet spin system SrCu2(BO3)2 by 11B NMR, from which the magnitudes of
the intradimer Dzyaloshinsky-Moriya interaction and the staggered g-tensor were
determined. These anisotropic interactions cause singlet-triplet mixing and
eliminate a quantum phase transition at the expected critical field Hc for gap
closing. They also provide a quantitative account for some puzzling phenomena
such as the onset of a uniform magnetization below the and the persistence of
the excitation gap above Hc. The gap was accurately determined from the
activation energy of the nuclear relaxation rate.Comment: 8 pages, 5 figures, published versio
Effect of pyridoxine treatment of a homocystinuric patient on the urinary excretion of some sulfur-containing amino acids
The effect of pyridoxine treatment of a homocystinuric
patient on the urinary excretion of some sulfur-containing amino acids was studied and the following results were obtained. As a result of pyridoxine treatment, urinary homocystine decreased to a fairly great extent, and its unusual metabolites S.(3-hydroxy-3-carboxyn- propylthio) homocysteine (HCPTHC) and S-C8-carboxyethylthio homocysteine (j3-CETHC) increased to some extent. But its oxidation product (homocysteic acid) showed a tendency to decrease slightly. Urinary methionine and cystine increased to some extent, but cysteinehomocysteine mixed disulfide showed no remarkable change.</p
Current-perpendicular-to-plane giant magnetoresistance of a spin valve using Co2MnSi Heusler alloy electrodes
We report the current-perpendicular-to-plane giant magnetoresistance of a
spin valve with Co2MnSi (CMS) Heusler alloy ferromagnetic electrodes. A
multilayer stack of Cr/Ag/Cr/CMS/Cu/CMS/Fe25Co75/Ir28Mn72/Ru was deposited on a
MgO (001) single crystal substrate. The bottom CMS layer was epitaxially grown
on the Cr/Ag/Cr buffer layers and was ordered to the L21 structure after
annealing at 673 K. The upper CMS layer was found to grow epitaxially on the Cu
spacer layer despite the large lattice mismatch between Cu and CMS. The highest
MR ratios of 8.6% and 30.7% for CPP-GMR were recorded at room temperature and 6
K, respectively. The high spin polarization of the epitaxial CMS layers is the
most likely origin of the high MR ratio.Comment: 14 pages, 3 figures, presented at the 53rd Annual Conference on
Magnetism and Magnetic Materials, to be published in J. Appl. Phy
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