Now showing items 406-425 of 705

    • Pairing and Phase Separation in a Polarized Fermi Gas 

      Partridge, Guthrie B.; Li, Wenhui; Kamar, Ramsey I.; Liao, Yean-an; Hulet, Randall G. (2006)
      We report the observation of pairing in a gas of atomic fermions with unequal numbers of two components. Beyond a critical polarization, the gas separates into a phase that is consistent with a superfluid paired core ...
    • Performance of CMS muon reconstruction in pp collision events at √s = 7 TeV 

      CMS Collaboration; Adair, A.; Boulahouache, C.; Cuplov, V.; Ecklund, K.M.; Geurts, F.J.M.; Padley, B.P.; Redjimi, R.; Roberts, J.; Zabel, J. (2012)
      The performance of muon reconstruction, identification, and triggering in CMS has been studied using 40 pb−1 of data collected in pp collisions at √s = 7 TeV at the LHC in 2010. A few benchmark sets of selection criteria ...
    • Performance of the CMS missing transverse momentum reconstruction in pp data at √s = 8 TeV 

      CMS Collaboration; 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)
      The performance of missing transverse energy reconstruction algorithms is presented using √s=8 TeV proton-proton (pp) data collected with the CMS detector. Events with anomalous missing transverse energy are studied, and ...
    • The performance of the CMS muon detector in proton-proton collisions at √s = 7 TeV at the LHC 

      CMS Collaboration; Adair, A.; Akgun, B.; Boulahouache, C.; Ecklund, K.M.; Geurts, F.J.M.; Li, W.; Padley, B.P.; Redjimi, R.; Roberts, J.; Zabel, J. (2013)
      The performance of all subsystems of the CMS muon detector has been studied by using a sample of proton-proton collision data at √s = 7 TeV collected at the LHC in 2010 that corresponds to an integrated luminosity of ...
    • Performance of τ-lepton reconstruction and identification in CMS 

      CMS Collaboration; Adair, A.; Boulahouache, C.; Ecklund, K.M.; Geurts, F.J.M.; Padley, B.P.; Redjimi, R.; Roberts, J.; Zabel, J. (2012)
      The performance of τ-lepton reconstruction and identification algorithms is studied using a data sample of proton-proton collisions at √s = 7 TeV, corresponding to an integrated luminosity of 36 pb−1 collected with the CMS ...
    • Permanent magnet trap for cold atoms 

      Tollett, J.J.; Bradley, C.C.; Sackett, C.A.; Hulet, R.G. (1995)
      We report the trapping of neutral atoms in a permanent magnet trap. Approximately 1×10˄8 ground-state lithium atoms have been confined in a nonzero magnetic-field minimum produced by six permanent magnets in an Ioffe ...
    • Petawatt laser absorption bounded 

      Levy, Matthew C.; Wilks, Scott C.; Tabak, Max; Libby, Stephen B.; Baring, Matthew G. (2014)
      The interaction of petawatt (1015W) lasers with solid matter forms the basis for advanced scientific applications such as table-top particle accelerators, ultrafast imaging systems and laser fusion. Key metrics for these ...
    • Phase coherence and superfluid-insulator transition in a disordered Bose-Einstein condensate 

      Chen, Yong P.; Hitchcock, J.; Dries, D.; Junker, M.; Welford, C.; Hulet, R.G. (2008)
      We have studied the effects of a disordered optical potential on the transport and phase coherence of a Bose-Einstein condensate (BEC) of L7i atoms. At moderate disorder strengths (VD), we observe inhibited transport and ...
    • Phase separation, competition, and volume-fraction control in NaFe1−xCoxA 

      Ma, Long; Dai, J.; Wang, P.S.; Lu, R.; Song, Yu; Zhang, Chenglin; Tan, G.T.; Dai, Pengcheng; Hu, D.; Li, S.L.; Normand, B.; Yu, Weiqiang (2014)
      We report a detailed nuclear magnetic resonance (NMR) study by combined Na23 and As75 measurements over a broad range of doping to map the phase diagram of NaFe1−xCoxAs. In the underdoped regime (x≤0.017), we find a magnetic ...
    • Photoabsorption by Ultracold Atoms and the Scattering Length 

      Côté, R.; Dalgarno, A.; Sun, Y.; Hulet, R.G. (1995)
      It is shown that photoabsorption in a gas of ultracold atoms depends on the sign and magnitude of the scattering length in the scattering of a pair of atoms. Measurements of fluorescence in 7Li are interpreted to show that ...
    • Photoassociation of a Bose-Einstein Condensate near a Feshbach Resonance 

      Junker, M.; Dries, D.; Welford, C.; Hitchcock, J.; Chen, Y.P.; Hulet, R.G. (2008)
      We measure the effect of a magnetic Feshbach resonance (FR) on the rate and light-induced frequency shift of a photoassociation resonance in ultracold Li7. The photoassociation-induced loss-rate coefficient Kp depends ...
    • Photoassociative frequency shift in a quantum degenerate gas 

      Gerton, Jordan M.; Frew, Brian J.; Hulet, Randall G. (2001)
      A light-induced frequency shift is observed in single-photon photoassociative spectra of magnetically trapped, quantum degenerate 7Li. The shift is a manifestation of the coupling between the threshold continuum scattering ...
    • Photoassociative Spectroscopy at Long Range in Ultracold Strontium 

      Nagel, S.B.; Mickelson, P.G.; Saenz, A.D.; Martinez, Y.N.; Chen, Y.C.; Killian, T.C.; Pellegrini, P.; Cote, R. (2005-03-03)
    • Physical model of the immune response of bacteria against bacteriophage through the adaptive CRISPR-Cas immune system 

      Han, Pu; Niestemski, Liang Ren; Barrick, Jeffrey E.; Deem, Michael W. (2013)
      Bacteria and archaea have evolved an adaptive, heritable immune system that recognizes and protects against viruses or plasmids. This system, known as the CRISPR-Cas system, allows the host to recognize and incorporate ...
    • The physics of bacterial decision making 

      Ben-Jacob, Eshel; Lu, Mingyang; Schultz, Daniel; Onuchic, José N. (2014)
      The choice that bacteria make between sporulation and competence when subjected to stress provides a prototypical example of collective cell fate determination that is stochastic on the individual cell level, yet predictable ...
    • Pierced Lasso Bundles Are a New Class of Knot-like Motifs 

      Haglund, Ellinor; Sulkowska, Joanna I.; Noel, Jeffrey K.; Lammert, Heiko; Onuchic, José N.; Jennings, Patricia A. (2014)
      A four-helix bundle is a well-characterized motif often used as a target for designed pharmaceutical therapeutics and nutritional supplements. Recently, we discovered a new structural complexity within this motif created ...
    • Plasmonic Nanobubbles Rapidly Detect and Destroy Drug-Resistant Tumors 

      Lukianova-Hleb, Ekaterina Y.; Ren, Xiaoyang; Townley, Debra; Wu, Xiangwei; Kupferman, Michael E. (2012)
      The resistance of residual cancer cells after oncological resection to adjuvant chemoradiotherapies results in both high recurrence rates and high non-specific tissue toxicity, thus preventing the successful treatment of ...
    • Polarization jet events and excitation of weak SAR arcs 

      Sazykin, Stanislav; Fejer, B. G.; Galperin, Y. I.; Zinin, L. V.; Grigoriev, S. A.; Mendillo, M (2002)
      Polarization Jet (PJ), also known as Sub-Auroral Ion Drift (SAID), events are supersonic westward plasma drifts on the equatorward edge of the diffuse aurora in the evening and nighttime sector. Their optical F-region ...
    • Polyradical Character and Spin Frustration in Fullerene Molecules: An Ab Initio Non-Collinear Hartree–Fock Study 

      Jiménez-Hoyos, Carlos A.; Rodríguez-Guzmán, R.; Scuseria, Gustavo E. (2014)
      Most ab initio calculations on fullerene molecules have been carried out on the basis of the paradigm of the Hückel model. This is consistent with the restricted nature of the independent-particle model underlying such ...
    • Polyradical Character and Spin Frustration in Fullerene Molecules: An Ab Initio Non-Collinear Hartree–Fock Study 

      Jiménez-Hoyos, Carlos A.; Rodríguez-Guzmán, R.; Scuseria, Gustavo E. (2014)
      Most ab initio calculations on fullerene molecules have been carried out on the basis of the paradigm of the Hückel model. This is consistent with the restricted nature of the independent-particle model underlying such ...