Now showing items 76-95 of 705

    • Dark Matter Results from 225 Live Days of XENON100 Data 

      The XENON100 collaboration; Shagin, P. (2012-11)
      We report on a search for particle dark matter with the XENON100 experiment, operated at the Laboratori Nazionali del Gran Sasso for 13 months during 2011 and 2012. XENON100 features an ultralow electromagnetic background ...
    • Defining and resolving current systems in geospace 

      Ganushkina, N.Y.; Liemohn, M.W.; Dubyagin, S.; Daglis, I.A.; Dandouras, I.; De Zeeuw, D.L.; Ebihara, Y.; Ilie, R.; Katus, R.; Kubyshkina, M.; Milan, S.E.; Ohtani, S.; Ostgaard, N.; Reistad, J.P.; Tenfjord, P.; Toffoletto, F.; Zaharia, S.; Amariutei, O. (2015)
      Electric currents flowing through near-Earth space (R≤12RE) can support a highly distorted magnetic field topology, changing particle drift paths and therefore having a nonlinear feedback on the currents themselves. A ...
    • Deformation of a Trapped Fermi Gas with Unequal Spin Populations 

      Partridge, G.B.; Li, Wenhui; Liao, Y.A.; Hulet, R.G.; Haque, M.; Stoof, H.T.C. (2006)
      The real-space densities of a polarized strongly interacting two-component Fermi gas of Li6 atoms reveal two low-temperature regimes, both with a fully paired core. At the lowest temperatures, the unpolarized core deforms ...
    • Degenerate Fermi Gas of 87Sr 

      DeSalvo, B.J.; Yan, M.; Mickelson, P.G.; Martinez de Escobar, Y.N.; Killian, T.C. (2010-07-13)
      We report quantum degeneracy in a gas of ultracold fermionic Sr87 atoms. By evaporatively cooling a mixture of spin states in an optical dipole trap for 10.5 s, we obtain samples well into the degenerate regime with ...
    • Density matrix embedding from broken symmetry lattice mean fields 

      Bulik, Ireneusz W.; Scuseria, Gustavo E.; Dukelsky, Jorge (2014)
      Several variants of the recently proposed density matrix embedding theory (DMET) [G. Knizia and G. K-L. Chan, Phys. Rev. Lett. 109, 186404 (2012)] are formulated and tested. We show that spin symmetry breaking of the lattice ...
    • Dephasing of G-band phonons in single-wall carbon nanotubes probed via impulsive stimulated Raman scattering 

      Kim, J.-H.; Yee, K.-J.; Lim, Y.-S.; Booshehri, L.G.; Haroz, E.H.; Kono, J. (2012)
      We study the coherent dynamics of G-band phonons in single-wall carbon nanotubes through impulsive stimulated Stokes and anti-Stokes Raman scattering. The probe energy dependence of the phonon amplitude as well as the ...
    • Description and performance of track and primary-vertex reconstruction with the CMS tracker 

      Adair, A.; Akgun, B.; Ecklund, K.M.; Geurts, F.J.M.; Li, W.; Michlin, B.; Padley, B.P.; Redjimi, R.; Roberts, J.; Zabel, J. (2014)
      A description is provided of the software algorithms developed for the CMS tracker both for reconstructing charged-particle trajectories in proton-proton interactions and for using the resulting tracks to estimate the ...
    • Detecting antiferromagnetism of atoms in an optical lattice via optical Bragg scattering 

      Corcovilos, T.A.; Baur, S.K.; Hitchcock, J.M.; Mueller, E.J.; Hulet, R.G. (2010)
      Antiferromagnetism of ultracold fermions in an optical lattice can be detected by Bragg diffraction of light, in analogy to the diffraction of neutrons from solid-state materials. A finite sublattice magnetization will ...
    • DETECTION OF SPECTRAL EVOLUTION IN THE BURSTS EMITTED DURING THE 2008–2009 ACTIVE EPISODE OF SGR J1550−5418 

      Von Kienlin, Andreas; Gruber, David; Kouveliotou, Chryssa; Granot, Jonathan; Baring, Matthew G.; Gogus, Ersin; Huppenkothen, Daniela; Kaneko, Yuki; Lin, Lin; Watts, Anna L.; Bhat, Narayana P.; Guiriec, Sylvain; Van Der Horst, Alexander J.; Bissaldi, Elisabetta; Greiner, Jochen; Meegan, Charles A.; Paciesas, William S.; Preece, Robert D.; Rau, Arne (2012)
      In early 2008 October, the soft gamma repeater SGR J1550−5418 (1E 1547.0−5408, AX J155052−5418, PSR J1550−5418) became active, emitting a series of bursts which triggered the Fermi Gamma-ray Burst Monitor (GBM) after ...
    • Determination of the top-quark pole mass and strong coupling constant from the tt production cross section in pp collisions at √s = 7 TeV 

      Adair, A.; Akgun, B.; Ecklund, K.M.; Geurts, F.J.M.; Li, W.; Michlin, B.; Padley, B.P.; Redjimi, R.; Roberts, J.; Zabel, J. (2014)
      The inclusive cross section for top-quark pair production measured by the CMS experiment in proton–proton collisions at a center-of-mass energy of 7 TeV is compared to the QCD prediction at next-to-next-to-leading order ...
    • Di-electron spectrum at mid-rapidity in p + p collisions at √ s = 200 GeV 

      STAR Collaboration; Butterworth, J.; Eppley, J.; Geurts, F.; Llope, W.J.; McDonald, D.; Yepes, P. (2012)
      We report on the mid-rapidity mass spectrum of di-electrons and cross sections of pseudoscalar and vector mesons via e + e − decays, from √ s = 200 GeV p + p collisions, measured by the large-acceptance experiment STAR at ...
    • Diagnosing the Time Dependence of Active Region Core Heating from the Emission Measure. II. Nanoflare Trains 

      Reep, J.W.; Bradshaw, S.J.; Klimchuk, J.A. (2013)
      The time dependence of heating in solar active regions can be studied by analyzing the slope of the emission measure distribution coolward of the peak. In a previous study we showed that low-frequency heating can account for ...
    • DIAGNOSING THE TIME-DEPENDENCE OF ACTIVE REGION CORE HEATING FROM THE EMISSION MEASURE. I. LOW-FREQUENCY NANOFLARES 

      Bradshaw, S.J.; Klimchuk, J.A.; Reep, J.W. (2012)
      Observational measurements of active region emission measures contain clues to the time dependence of the underlying heating mechanism. A strongly nonlinear scaling of the emission measure with temperature indicates a large ...
    • Dielectron azimuthal anisotropy at mid-rapidity in Au + Au collisions at √sNN=200 GeV 

      STAR Collaboration; Butterworth, J.; Eppley, G.; Geurts, F.; Llope, W.J.; Roberts, J.B.; Xin, K.; Yepes, P. (2014)
      We report on the first measurement of the azimuthal anisotropy (v2) of dielectrons (e+e− pairs) at mid-rapidity from √sNN=200 GeV Au + Au collisions with the STAR detector at the Relativistic Heavy Ion Collider (RHIC), ...
    • Dielectron Mass Spectra from Au+Au Collisions at √sNN=200  GeV 

      STAR Collaboration; Butterworth, J.; Eppley, G.; Geurts, F.; Llope, W.J.; Roberts, J.B.; Xin, K.; Yepes, P. (2014)
      We report the STAR measurements of dielectron (e+e−) production at midrapidity (|yee|<1) in Au+Au collisions at √sNN=200  GeV. The measurements are evaluated in different invariant mass regions with a focus on 0.30–0.76 ...
    • Differential cross section measurements for the production of a W boson in association with jets in proton–proton collisions at √s=7 eV 

      Adair, A.; Akgun, B.; Ecklund, K.M.; Geurts, F.J.M.; Li, W.; Michlin, B.; Padley, B.P.; Redjimi, R.; Roberts, J.; Zabel, J. (2015)
      Measurements are reported of differential cross sections for the production of a W boson, which decays into a muon and a neutrino, in association with jets, as a function of several variables, including the transverse ...
    • Dipolar relaxation collisions in magnetically trapped 7Li 

      Gerton, J.M.; Sackett, C.A.; Frew, B.J.; Hulet, R.G. (1999)
      We report the measurement of the rate constant for dipolar relaxation from the (F=2, mF=2) hyperfine state of 7Li. The atoms are confined in a permanent magnet trap at a field of 103 G. The measured value of (1.05±0.10)× ...
    • Direct observation of growth and collapse of a Bose-Einstein condensate with attractive interactions 

      Gerton, Jordan M.; Strekalov, Dmitry; Prodan, Ionut; Hulet, Randall G. (2000)
      Quantum theory predicts that Bose-Einstein condensation of a spatially homogeneous gas with attractive interactions is precluded by a conventional phase transition into either a liquid or solid [1]. When confined to a trap, ...
    • Directed and elliptic flow of charged particles in Cu + Cu collisions at √sNN=22.4 GeV 

      STAR Collaboration; Eppley, G.; Geurts, F.; Liu, J.; McDonald, D.; Roberts, J.B.; Yepes, P. (2012)
      This paper reports results for directed flow v1 and elliptic flow v2 of charged particles in Cu + Cu collisions at √sNN=22.4 GeV at the Relativistic Heavy Ion Collider. The measurements are for the 0–60% most central ...
    • Directed Flow of Identified Particles in Au+Au Collisions at √SNN=200  GeV at RHIC 

      STAR Collaboration; Butterworth, J.; Eppley, G.; Geurts, F.; Llope, W.J.; McDonald, D.; Roberts, J.B.; Xin, K.; Yepes, P. (2012)
      STAR’s measurements of directed flow (v1) around midrapidity for π±, K±, K0S, p, and p¯ in Au+Au collisions at √sNN=200  GeV are presented. A negative v1(y) slope is observed for most of produced particles (π±, K±, K0S, ...