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CS
C. Henrico Stam
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Synthesis and pinning properties of the infinite-layer superconductor Sr0.9La0.1CuO
Adrian Meule
et al.
Jul 5, 2001
We report the high-pressure synthesis of the electron-doped infinite-layersuperconductor Sr0.9La0.1CuO2 and its superconducting properties. A Rietveldanalysis of X-ray powder diffraction data showed that, within the resolution ofthe measurement, the sample had purely an infinite-layer structure without anydiscernible impurities. The superconducting volume fraction and the transitionwidth were greatly improved compared to those in previous reports. Theirreversibility field line and the intragranular critical current density weremuch higher than those of La1.85Sr0.15CuO4 and Nd1.85Ce0.15CuO4. The strongerpinning behaviors are consistent with the strong interlayer coupling due to theshort distance between CuO2 planes.
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Transverse voltage in high-Tc superconductors in zero magnetic fields
Katrine Søborg Spang
et al.
Jul 20, 2001
Longitudinal and transverse voltages have been measured in zero externalmagnetic fields. In close vicinity of the superconducting transition nonzerotransverse voltage has been observed while far away from Tc, both above andbelow no such voltage has been detected. The value of the transverseresistivity depends on the value of the transport current. Several models havebeen discussed taking into account also the penetration of self field due tothe applied transport current. It seems that observed results can be explainedusing the Kosterlitz-Thouless model as a result of an unpairing ofvortex-antivortex pairs created below Tkt due to fluctuations. At Tkt freevortices and antivortices are created and can contribute to a dissipation ofenergy. Their movement should also be responsible for the observed nonzerotransverse voltage.
Physics
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Resonance Studies at STAR
Katrine Søborg Spang
et al.
Mar 31, 2001
We report on the observed signals of ${K^{\star0}(892)}\to\pi K$ and$\phi(1020)\to K^{+}K^{-}$ using the mixed-event method with powerfulstatistics from the large acceptance and highly efficient STAR TPC. Preliminaryresults from the first observation of such states from the year-one STAR datain $\sqrt{s_{NN}}=130$ GeV Au-Au collisions are presented. The$K^{\star0}/h^{-}$ ratios with an assumed $K^{\star0}$ $p_{T}$ inverse slope of300MeV are compatible with that from pp at ISR. For 14% central Au+Aucollisions, we observe $K^{\star0}/h^{-}=0.060\pm0.007(stat)$ and$\bar{K^{\star0}}/h^{-}=0.058\pm0.007(stat)$. We show that$\bar{\Lambda}/\Lambda=0.77\pm0.07(stat)$ from this method is consistent withthe measurement via decay topology.
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Probing colored glass via $q\bar{q}$ photoproduction
Katrine Søborg Spang
et al.
Jul 12, 2001
In this paper, we calculate the cross-section for the photoproduction ofquark-antiquark pairs in the peripheral collision of ultra-relativistic nuclei,by treating the color field of the nuclei within the Color Glass Condensatemodel. We find that this cross-section is sensitive to the saturation scale$Q_s^2$ that characterizes the model. In particular, the transverse momentumspectrum of the produced pairs could be used to measure the properties of thecolor glass condensate.
Nuclear Physics
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Large Isospin mixing in phi radiative decay and the spatial size of the f0(980)- a0(980) meson
Katrine Søborg Spang
et al.
Jun 11, 2001
The measured rate for phi to gamma f0(980) appears to be larger than allowedon rather general grounds. We show that mixing between the f0(980) and a0(980),due to their dynamical interaction with the nearby KKbar thresholds, radicallyaffects some existing predictions of their production in phi radiative decay.We predict that Gamma(phi to gamma f0)/Gamma(phi to gamma a_0) approx 3; thatsum (b.r.(phi to gamma f0) + b.r. (phi to gamma a_0)) < 5 x 10^-4 with probableindividual branching ratios 2 x 10^-4 and 0.7 x 10^-4 respectively.
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Background Enhancement of CPT Reach at an Asymmetric Phi Factory
Katrine Søborg Spang
et al.
Jun 29, 2001
Photoproduction of neutral-kaon pairs is studied from the perspective of CPand CPT studies. Interference of the P and S waves, with the former due todiffractive phi production and the latter to f_0/a_0 production, is shown toenhance the CPT reach. Results are presented of Monte Carlo studies based onrates expected in future experiments.
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Few-Body Problems in Hadron Spectroscopy
Katrine Søborg Spang
et al.
Sep 30, 2000
Some rigorous results can be derived using a very simple approach to hadronspectroscopy, in which a static potential is associated with non-relativistickinematics. Several regularities of the experimental spectrum are explained bysuch models. It is underlined that certain methods developed for hadronicphysics have found applications in other fields, in particular atomic physics.A few results can be extended to cases involving spin-dependent forces orrelativistic kinematics.
Nuclear Physics
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