2,025 research outputs found

    Strong Magnetization Measured in the Cool Cores of Galaxy Clusters

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    Tangential discontinuities, seen as X-ray edges known as cold fronts (CFs), are ubiquitous in cool-core galaxy clusters. We analyze all 17 deprojected CF thermal profiles found in the literature, including three new CFs we tentatively identify (in clusters A2204 and 2A0335). We discover small but significant thermal pressure drops below all nonmerger CFs, and argue that they arise from strong magnetic fields below and parallel to the discontinuity, carrying 10%-20% of the pressure. Such magnetization can stabilize the CFs, and explain the CF-radio minihalo connection.Comment: PRL accepted, additional control tests adde

    Syntheses of 18F-5-Fluorouracil, 18F-Fluorouridine and 18F-5-Fluoro-2\u27-deoxyuridine

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    開始ページ、終了ページ: 冊子体のページ付

    Ni-impurity effects on the superconducting gap of La2−x_{2-x}Srx_{x}CuO4_4 studied from the magnetic field and temperature dependence of the electronic specific heat

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    The magnetic field and temperature dependence of the electronic specific heat CelC_{\rm el} have been systematically investigated in La2−xSrxCu1−yNiyO4\rm La_{2-{\it x}}Sr_{\it x}Cu_{1-{\it y}}Ni_{\it y}O_4 (LSCNO) in order to study Ni-impurity effects on the superconducting (SC) gap. In LSCNO with xx=0.15 and yy=0.015, the value of γ\gamma (≡Cel/T\equiv C_{\rm el}/T) at TT=0 K, γ0\gamma_0, is enhanced under the magnetic field HH applied along the c\bm c-axis. The increment of γ0\gamma_0, Δγ0\Delta \gamma_0, follows the Volovik relation Δγ0\Delta \gamma_0=AHA\sqrt{H}, characteristic of the SC gap with line nodes, with prefactor AA similar to that of a pure sample. The Cel/TC_{\rm el}/T vs. TT curve under HH=0 shows a d-wave-like SC anomaly with an abrupt increase at TcT_{\rm c} and TT-linear dependence at TT≪\llTcT_{\rm c}, although the γ0\gamma_0-value in the Cel/TC_{\rm el}/T vs. TT curve increases with increasing Ni concentrations. Interestingly, as the SC part of Cel/TC_{\rm el}/T, Cel/TC_{\rm el}/T−-γ0\gamma_0≡\equivγs\gamma_{\rm s}, decreases in LSCNO, TcT_{\rm c} is reduced in proportion to the decrease of γs\gamma_{\rm s}. These findings can be explained phenomenologically by a simple model in which Ni impurities bring about strong pair breaking at the edges of the coherent nodal part of the Fermi surface but in the vicinity of the nodes of the SC gap. The reduction of the SC condensation energy U0U_0 in LSCNO, evaluated from CelC_{\rm el} at TT {0.3em}\raisebox{0.4ex}{<<} {-0.75em}\raisebox{-.7ex}{∼\sim} {0.3em}TcT_{\rm c}, is also understood by the same model.Comment: 7 pages, 6 figures, accepted in Phys. Rev.

    Development of a New in vivo Double Autoradiogram for the Analysis of Dopaminergic System of the Rat Brain

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    開始ページ、終了ページ: 冊子体のページ付

    The Synthesis of o- and p-[18F]Fluorobenzyl Bromides and Their Application to the Preparation of Labeled Neuroleptics

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    開始ページ、終了ページ: 冊子体のページ付

    Routine Method of 77Kr Production

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    開始ページ、終了ページ: 冊子体のページ付

    Increased Amounts of D-Enantiomer Dependent on Alkaline Concentration in the Synthesis of L-[methyl-11C] Methionine

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    開始ページ、終了ページ: 冊子体のページ付

    Narrow Line Photoassociation in an Optical Lattice

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    With ultracold 88^{88}Sr in a 1D magic wavelength optical lattice, we performed narrow line photoassociation spectroscopy near the 1^1S0−3_0 - ^3P1_1 intercombination transition. Nine least-bound vibrational molecular levels associated with the long-range 0u0_u and 1u1_u potential energy surfaces were measured and identified. A simple theoretical model accurately describes the level positions and treats the effects of the lattice confinement on the line shapes. The measured resonance strengths show that optical tuning of the ground state scattering length should be possible without significant atom loss.Comment: 4 pages, 4 figure
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