7,589 research outputs found

    An interpretation of the observed oxygen and nitrogen enhancements in low energy cosmic rays

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    It is proposed that the enhancements of cosmic ray oxygen and nitrogen observed at approximately 10 MeV/nucleon could result from neutral interstellar particles which are swept into the solar cavity. This is caused by motion of the sun through the interstellar medium, and the particles are subsequently ionized and accelerated

    Who’s on top: Can gender differences in risk-taking lead to gendered hierarchies?

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    Crystal structure and physical properties of EuPtIn4_{4} intermetallic antiferromagnet

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    We report the synthesis of EuPtIn4_{4} single crystalline platelets by the In-flux technique. This compound crystallizes in the orthorhombic Cmcm structure with lattice parameters a=4.542(1)a=4.542(1) \AA, b=16.955(2)b=16.955(2) \AA \, and c=7.389(1)c=7.389(1) \AA. Measurements of magnetic susceptibility, heat capacity, electrical resistivity, and electron spin resonance (ESR) reveal that EuPtIn4_{4} is a metallic Curie-Weiss paramagnet at high temperatures and presents antiferromagnetic (AFM) ordering below TN=13.3T_{N}=13.3 K. In addition, we observe a successive anomaly at T∗=12.6T^{*} = 12.6 K and a spin-flop transition at Hc∼2.5H_{c} \sim 2.5 T applied along the acac-plane. In the paramagnetic state, a single Eu2+^{2+} Dysonian ESR line with a Korringa relaxation rate of b=4.1(2)b = 4.1(2) Oe/K is observed. Interestingly, even at high temperatures, both ESR linewidth and electrical resistivity reveal a similar anisotropy. We discuss a possible common microscopic origin for the observed anisotropy in these physical quantities likely associated with an anisotropic magnetic interaction between Eu2+^{2+} 4ff electrons mediated by conduction electrons.Comment: 5 pages, 5 figure

    Managed Engagement: The Case of Castro\u27s Cuba

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