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2014-04-18
04:34
Optimising a Muon Spectrometer for Measurements at the ISIS Pulsed Muon Source / Giblin, S R ; Cottrell, S P ; King, P J C ; Tomlinson, S ; Jago, S J S ; Randall, L J ; Roberts, M J ; Norris, J ; Howarth, S ; Mutamba, Q B et al.
This work describes the development of a state-of-the-art muon spectrometer for the ISIS pulsed muon source. Conceived as a major upgrade of the highly successful EMU instrument, emphasis has been placed on making effective use of the enhanced flux now available at the ISIS source. [...]
arXiv:1404.4542.- 2014 - Published in : Pages (2014) External link: Preprint

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2014-04-18
04:33
The Single-Channel Regime of Transport through Random Media / Peña, A ; Girschik, A ; Libisch, F ; Rotter, S ; Chabanov, A A
The propagation of light through samples with random inhomogeneities can be described by way of transmission eigenchannels, which connect incoming and outgoing external propagating modes. Although the detailed structure of a disordered sample can generally not be fully specified, these transmission eigenchannels can nonetheless be successfully controlled and utilized for focusing and imaging light through random media. [...]
arXiv:1404.4180.- 2014 - Published in : Nat. Comm. 5 (2014) 3488 External link: Preprint

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2014-04-18
04:33
Proton capture by 14N at astrophysical energies / Grineviciute, J ; Halderson, Dean
Calculations are reported for low energy, proton capture by 14N with the recoil corrected continuum shell model. An interaction from a fit to Cohen and Kurath (6-16) p-shell matrix elements and Reid soft core g-matrix elements is employed. [...]
arXiv:1404.4624.- 2014 - Published in : Nucl. Part. Phys.: 35 (2008) , pp. 055201 External link: Preprint

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2014-04-18
04:33
Dirac oscillators and the relativistic R matrix / Grineviciute, J ; Halderson, Dean
The Dirac oscillators are shown to be an excellent expansion basis for solutions of the Dirac equation by $R$-matrix techniques. The combination of the Dirac oscillator and the $R$-matrix approach provides a convenient formalism for reactions as well as bound state problems. [...]
arXiv:1404.4621.- 2014 - Published in : Phys. Rev. C 80 (2009) 044607 External link: Preprint

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2014-04-18
04:32
Quantum Local Symmetry of the D-Dimensional Non-Linear Sigma Model: A Functional Approach / Quadri, Andrea
We summarize recent progress on the symmetric subtraction of the Non-Linear Sigma Model in $D$ dimensions, based on the validity of a certain Local Functional Equation (LFE) encoding the invariance of the SU(2) Haar measure under local left transformations. The deformation of the classical non-linearly realized symmetry at the quantum level is analyzed by cohomological tools. [...]
arXiv:1404.4490.- 2014 - 26 p. - Published in : Symmetry 6 (2014) 234-255 External link: Preprint

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2014-04-18
04:28
On the origin of stars with and without planets. Tc trends and clues to Galactic evolution / Adibekyan, V Zh ; Hernandez, J I Gonzalez ; Mena, E Delgado ; Sousa, S G ; Santos, N C ; Israelian, G ; Figueira, P ; de Lis, S Bertran
We explore a sample of 148 solar-like stars to search for a possible correlation between the slopes of the abundance trends versus condensation temperature (known as the Tc slope) with stellar parameters and Galactic orbital parameters in order to understand the nature of the peculiar chemical signatures of these stars and the possible connection with planet formation. We find that the Tc slope significantly correlates (at more than 4sigma) with the stellar age and the stellar surface gravity. [...]
arXiv:1404.4514.- 2014 - 7 p. - Published in : Astron. Astrophys. 564 (2014) L15 External link: Preprint

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2014-04-18
04:28
Perspectives of current-layer diagnostics in solar flares / Oreshina, A V ; Oreshina, I V
A reconnecting current layer is a `heart' of a solar flare, because it is a place of magnetic-field energy release. However there are no direct observations of these layers. [...]
arXiv:1404.4434.- 2014 - Published in : Astronomy & Astrophysics 558 (2013) A16 External link: Preprint

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2014-04-18
04:28
Companions of Stars: From Other Stars to Brown Dwarfs to Planets: The Discovery of the First Methane Brown Dwarf / Oppenheimer, B R
The discovery of the first methane brown dwarf provides a framework for describing the important advances in both fundamental physics and astrophysics that are due to the study of companions of stars. I present a few highlights of the history of this subject along with details of the discovery of the brown dwarf Gliese 229B. [...]
arXiv:1404.4430.- 2014 - 31 p. - Published in : Chapter from "50 Years of Brown Dwarfs," V. Joergens, ed., Astrophysics and Space Science Library, Volume 401, (Zurich: Springer) 2014 External link: Preprint

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2014-04-17
05:09
Ab initio geometry and bright excitation of carotenoids: Quantum Monte Carlo and Many Body Green's Function Theory calculations on peridinin / Coccia, Emanuele ; Varsano, Daniele ; Guidoni, Leonardo
In this letter we report the singlet ground state structure of the full carotenoid peridinin by means of variational Monte Carlo (VMC) calculations. The VMC relaxed geometry has an average bond length alternation of 0.1165(10) {\AA}, larger than the values obtained by DFT (PBE, B3LYP and CAM-B3LYP) and shorter than that calculated at the Hartree-Fock (HF) level. [...]
arXiv:1404.4233.- 2014 - Published in : J. Chem. Theory Comput.: 10 (2014) , pp. 501-506 External link: Preprint

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2014-04-17
05:09
Flood avalanches in a semiarid basin with a dense reservoir network / Peter, Samuel J ; de Araújo, J C ; Araújo, N A M ; Herrmann, H J
This study investigates flood avalanches in a dense reservoir network in the semiarid north-eastern Brazil. The population living in this area strongly depends on the availability of the water from this network. [...]
arXiv:1404.4232.- 2014 - Published in : Journal of Hydrology 512 (2014) 408 External link: Preprint

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