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41.
Riordan S Abrahamyan S Craver B Kelleher A Kolarkar A Miller J Cates GD Liyanage N Wojtsekhowski B Acha A Allada K Anderson B Aniol KA Annand JR Arrington J Averett T Beck A Bellis M Boeglin W Breuer H Calarco JR Camsonne A Chen JP Chudakov E Coman L Crowe B Cusanno F Day D Degtyarenko P Dolph PA Dutta C Ferdi C Fernández-Ramírez C Feuerbach R Fraile LM Franklin G Frullani S Fuchs S Garibaldi F Gevorgyan N Gilman R Glamazdin A Gomez J Grimm K Hansen JO Herraiz JL Higinbotham DW Holmes R 《Physical review letters》2010,105(26):262302
The electric form factor of the neutron was determined from studies of the reaction 3He(e,e'n)pp in quasielastic kinematics in Hall A at Jefferson Lab. Longitudinally polarized electrons were scattered off a polarized target in which the nuclear polarization was oriented perpendicular to the momentum transfer. The scattered electrons were detected in a magnetic spectrometer in coincidence with neutrons that were registered in a large-solid-angle detector. More than doubling the Q2 range over which it is known, we find G(E)(n)=0.0236±0.0017(stat)±0.0026(syst), 0.0208±0.0024±0.0019, and 0.0147±0.0020±0.0014 for Q(2)=1.72, 2.48, and 3.41 GeV2, respectively. 相似文献
42.
Besseling R Isa L Ballesta P Petekidis G Cates ME Poon WC 《Physical review letters》2010,105(26):268301
We report experiments on hard-sphere colloidal glasses that show a type of shear banding hitherto unobserved in soft glasses. We present a scenario that relates this to an instability due to shear-concentration coupling, a mechanism previously thought unimportant in these materials. Below a characteristic shear rate γ(c) we observe increasingly nonlinear and localized velocity profiles. We attribute this to very slight concentration gradients in the unstable flow regime. A simple model accounts for both the observed increase of γ(c) with concentration, and the fluctuations in the flow. 相似文献
43.
Slifer K Amarian M Auerbach L Averett T Berthot J Bertin P Bertozzi B Black T Brash E Brown D Burtin E Calarco J Cates G Chai Z Chen JP Choi S Chudakov E Ciofi Degli Atti C Cisbani E de Jager CW Deur A DiSalvo R Dieterich S Djawotho P Finn M Fissum K Fonvieille H Frullani S Gao H Gao J Garibaldi F Gasparian A Gilad S Gilman R Glamazdin A Glashausser C Glöckle W Golak J Goldberg E Gomez J Gorbenko V Hansen JO Hersman B Holmes R Huber GM Hughes E Humensky B Incerti S Iodice M Jensen S Jiang X 《Physical review letters》2008,101(2):022303
We present a measurement of the spin-dependent cross sections for the 3He over -->(e over -->,e')X reaction in the quasielastic and resonance regions at a four-momentum transfer 0.1< or =Q2< or =0.9 GeV2. The spin-structure functions have been extracted and used to evaluate the nuclear Burkhardt-Cottingham and extended Gerasimov-Drell-Hearn sum rules for the first time. The data are also compared to an impulse approximation calculation and an exact three-body Faddeev calculation in the quasielastic region. 相似文献
44.
Ignacio Pagonabarraga Alexander J. Wagner M. E. Cates 《Journal of statistical physics》2002,107(1-2):39-52
By performing lattice Boltzmann simulations of a binary mixture, we scrutinize the dynamical scaling hypothesis for the spinodal decomposition of binary mixtures for the crossover region, i.e., the region of parameters in the growth curve where neither inertia nor viscous forces dominate the coarsening process. Our results give no evidence for a breakdown of scaling in this region, as might arise if the process were limited by molecular scale physics at the point of fluid pinch-off between domains. A careful data analysis allows us to refine previous estimates on the width of the crossover region which is somewhat narrower than previously reported. 相似文献
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47.
The effects on the radiation response of Harwell polymethylmethacrylate (PMMA) dosimeters of dose-rate, radiation type, temperature during irradiation and post-irradiation storage, and post-irradiation stability, are of importance to the operators of commercial irradiation facilities.
This paper describes recent studies of the effects of some of these parameters on the radiation response of Harwell Red 4034, Amber 3042, and Gammachrome YR Perspex dosimeters, and provides data on batch to batch variation and shelf-life. 相似文献
48.
We explore theoretically the modifications to the interactions between charged surfaces across an ionic solution caused by the presence of dielectric polymers. Although the chains are neutral, the polymer physics and the electrostatics are coupled; the intrasurface electric fields polarize any low-permittivity species (e.g., polymer) dissolved in a high-permittivity solvent (e.g., water). This coupling enhances the polymer depletion from the surfaces and increases the screening of electrostatic interactions with respect to a model which treats polymeric and electrostatic effects as independent. As a result, the range of the ionic contribution to the osmotic interaction between surfaces is decreased while that of the polymeric contribution is increased. These changes modify the total interaction in a nonadditive manner. Building on the results for parallel surfaces, we investigate the effect of this coupling on the phase behavior of polymer-doped smectics. 相似文献
49.
N-[ (Diethoxyphosphinyl)imino] and N-[ (diphenylphosphinyl)imino]-5-methyl-1,2,5,6-tetrahydropyridines were prepared by sodium borohydride reduction of the corresponding pyridinium and 3-methyl pyridinium inner salts. The carbonyl analog of this latter precusor was resynthesized and its structure completely verified. 相似文献
50.