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Träfflista för sökning "WFRF:(Büscher J.) srt2:(2010-2014)"

Sökning: WFRF:(Büscher J.) > (2010-2014)

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1.
  • Aad, G., et al. (författare)
  • 2011
  • Tidskriftsartikel (refereegranskat)
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2.
  • Aad, G., et al. (författare)
  • 2012
  • swepub:Mat__t (refereegranskat)
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3.
  • Aad, G., et al. (författare)
  • 2013
  • swepub:Mat__t (refereegranskat)
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4.
  • Aad, G., et al. (författare)
  • 2011
  • swepub:Mat__t (refereegranskat)
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5.
  • Aad, G., et al. (författare)
  • 2011
  • swepub:Mat__t (refereegranskat)
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6.
  • Aad, G., et al. (författare)
  • 2013
  • Tidskriftsartikel (refereegranskat)
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7.
  • Aad, G., et al. (författare)
  • 2013
  • Tidskriftsartikel (refereegranskat)
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8.
  • Aad, G., et al. (författare)
  • 2014
  • Ingår i: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; :5
  • Tidskriftsartikel (refereegranskat)
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9.
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10.
  • Aad, G., et al. (författare)
  • 2012
  • Ingår i: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; :7
  • Tidskriftsartikel (refereegranskat)
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11.
  • Aad, G., et al. (författare)
  • 2013
  • Ingår i: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; :1
  • Tidskriftsartikel (refereegranskat)
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12.
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13.
  • Aad, G., et al. (författare)
  • 2014
  • Tidskriftsartikel (refereegranskat)
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14.
  • Aad, G, et al. (författare)
  • 2014
  • Ingår i: Physical Review Letters. - 1079-7114 .- 0031-9007. ; 113:17
  • Tidskriftsartikel (refereegranskat)
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15.
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16.
  • Aad, G., et al. (författare)
  • 2014
  • Tidskriftsartikel (refereegranskat)
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17.
  • Aad, G., et al. (författare)
  • 2014
  • Ingår i: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; :9
  • Tidskriftsartikel (refereegranskat)
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18.
  • Aad, G., et al. (författare)
  • 2014
  • Tidskriftsartikel (refereegranskat)
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19.
  •  
20.
  • Aad, G., et al. (författare)
  • 2014
  • Ingår i: Journal of High Energy Physics. - 1029-8479 .- 1126-6708. ; :11
  • Tidskriftsartikel (refereegranskat)
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21.
  • Aad, G., et al. (författare)
  • 2012
  • swepub:Mat__t (refereegranskat)
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22.
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23.
  • Aad, G., et al. (författare)
  • The ATLAS Inner Detector commissioning and calibration
  • 2010
  • Ingår i: European Physical Journal C. Particles and Fields. - : Springer Science and Business Media LLC. - 1434-6044 .- 1434-6052. ; 70:3, s. 787-821
  • Tidskriftsartikel (refereegranskat)abstract
    • The ATLAS Inner Detector is a composite tracking system consisting of silicon pixels, silicon strips and straw tubes in a 2 T magnetic field. Its installation was completed in August 2008 and the detector took part in data-taking with single LHC beams and cosmic rays. The initial detector operation, hardware commissioning and in-situ calibrations are described. Tracking performance has been measured with 7.6 million cosmic-ray events, collected using a tracking trigger and reconstructed with modular pattern-recognition and fitting software. The intrinsic hit efficiency and tracking trigger efficiencies are close to 100%. Lorentz angle measurements for both electrons and holes, specific energy-loss calibration and transition radiation turn-on measurements have been performed. Different alignment techniques have been used to reconstruct the detector geometry. After the initial alignment, a transverse impact parameter resolution of 22.1 +/- 0.9 mu m and a relative momentum resolution sigma (p) /p=(4.83 +/- 0.16)x10(-4) GeV(-1)xp (T) have been measured for high momentum tracks.
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24.
  • Åsman, Barbro, et al. (författare)
  • The ATLAS Level-1 Calorimeter Trigger : PreProcessor implementation and performance
  • 2012
  • Ingår i: Journal of Instrumentation. - 1748-0221. ; 7
  • Tidskriftsartikel (refereegranskat)abstract
    • The PreProcessor system of the ATLAS Level-1 Calorimeter Trigger (L1Calo) receives about 7200 analogue signals from the electromagnetic and hadronic components of the calorimetric detector system. Lateral division results in cells which are pre-summed to so-called Trigger Towers of size 0.1 x 0.1 along azimuth (phi) and pseudorapidity (eta). The received calorimeter signals represent deposits of transverse energy. The system consists of 124 individual PreProcessor modules that digitise the input signals for each LHC collision, and provide energy and timing information to the digital processors of the L1Calo system, which identify physics objects forming much of the basis for the full ATLAS first level trigger decision. This paper describes the architecture of the PreProcessor, its hardware realisation, functionality, and performance.
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25.
  • Roger, T., et al. (författare)
  • Precise Determination of the Unperturbed B8 Neutrino Spectrum
  • 2012
  • Ingår i: Phys. Rev. Lett.. ; 108:16, s. Art. no. 162502-
  • Tidskriftsartikel (refereegranskat)abstract
    • A measurement of the final state distribution of the 8B beta decay, obtained by implanting a 8B beam in a double-sided silicon strip detector, is reported here. The present spectrum is consistent with a recent independent precise measurement performed by our collaboration at the IGISOL facility, Jyvaskyla [O. S.Kirsebom et al., Phys. Rev. C 83, 065802 (2011)]. It shows discrepancies with previously measuredspectra, leading to differences in the derived neutrino spectrum. Thanks to a low detection threshold, theneutrino spectrum is for the first time directly extracted from the measured final state distribution, thusavoiding the uncertainties related to the extrapolation of R-matrix fits. Combined with the IGISOL data,this leads to an improvement of the overall errors and the extension of the neutrino spectrum at highenergy. The new unperturbed neutrino spectrum represents a benchmark for future measurements of thesolar neutrino flux as a function of energy.
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26.
  • Hyldegaard, S., et al. (författare)
  • R-matrix analysis of the beta decays of 12N and 12B
  • 2010
  • Ingår i: Physical Review C - Nuclear Physics. - 2469-9985 .- 2469-9993. ; 81:2
  • Tidskriftsartikel (refereegranskat)abstract
    • The β decays of 12N and 12B have been studied at KVI and JYFL to resolve the composition of the broad and interfering 0+ and 2+ strengths in the triple-α continuum. For the first time a complete treatment of 3α decay is presented including all major breakup channels. A multilevel, many-channel R-matrix formalism has been developed for the complete description of the breakup in combination with the recently published separate analysis of angular correlations. We find that, in addition to the Hoyle state at 7.65 MeV, more than one 0+ and 2+ state is needed to reproduce the spectra. Broad 03+ and 22+ states are found between 10.5 and 12 MeV in this work. The presence of β strength up to the 12N Q-value window suggests the presence of additional 0+ and 2+ components in the 12C structure at energies above 12.7 MeV.
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27.
  • Kirsebom, O. S., et al. (författare)
  • Precise and accurate determination of the B-8 decay spectrum
  • 2011
  • Ingår i: Physical Review C - Nuclear Physics. - 2469-9985 .- 2469-9993. ; 83:6
  • Tidskriftsartikel (refereegranskat)abstract
    • Accurate measurements of the B-8 neutrino spectrum are important for the interpretation of solar neutrino data. Experimentally, the B-8 neutrino spectrum can be obtained from the measurement of the beta-delayed alpha spectrum. We report on an alpha-alpha coincidence measurement performed at the IGISOL facility in Jyvaskyla, Finland. Our measurement allows extensive cross-checks to be performed and gives a more intense neutrino spectrum at high energies compared to the present standard. The deviation reaches 4% at the end point of the spectrum. Below 11 MeV, the deviation is less than 1%.
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28.
  • Hennige, S. J., et al. (författare)
  • Self-recognition in corals facilitates deep-sea habitat engineering
  • 2014
  • Ingår i: Scientific Reports. - : Nature Publishing Group. - 2045-2322. ; 4
  • Tidskriftsartikel (refereegranskat)abstract
    • The ability of coral reefs to engineer complex three-dimensional habitats is central to their success and the rich biodiversity they support. In tropical reefs, encrusting coralline algae bind together substrates and dead coral framework to make continuous reef structures, but beyond the photic zone, the cold-water coral Lophelia pertusa also forms large biogenic reefs, facilitated by skeletal fusion. Skeletal fusion in tropical corals can occur in closely related or juvenile individuals as a result of non-aggressive skeletal overgrowth or allogeneic tissue fusion, but contact reactions in many species result in mortality if there is no 'self-recognition' on a broad species level. This study reveals areas of 'flawless' skeletal fusion in Lophelia pertusa, potentially facilitated by allogeneic tissue fusion, are identified as having small aragonitic crystals or low levels of crystal organisation, and strong molecular bonding. Regardless of the mechanism, the recognition of 'self' between adjacent L. pertusa colonies leads to no observable mortality, facilitates ecosystem engineering and reduces aggression-related energetic expenditure in an environment where energy conservation is crucial. The potential for self-recognition at a species level, and subsequent skeletal fusion in framework-forming cold-water corals is an important first step in understanding their significance as ecological engineers in deep-seas worldwide.
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29.
  • Kirsebom, O. S., et al. (författare)
  • The 8B neutrino spectrum
  • 2010
  • Ingår i: 11th Symposium on Nuclei in the Cosmos, NIC 2010; Heidelberg; Germany; 19 July 2010 through 23 July 2010. - 1824-8039.
  • Konferensbidrag (refereegranskat)abstract
    • Knowledge of the energy spectrum of the neutrinos emitted in the β decay of8B in the Sun is needed to interpret the neutrino spectrum measured on Earth. Experimentally, the 8B neutrino spectrum may be αextracted from the measurement of the β -delayed a spectrum. In this contribution, the results of a recent α-α coincidence measurement are presented and compared to previous measurements. The implications for the neutrino spectrum are clarified.
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30.
  • Zerbi, F. M., et al. (författare)
  • HIRES : The High Resolution Spectrograph for E-ELT
  • 2014
  • Ingår i: Ground-based and Airborne Instrumentation for Astronomy V. - : SPIE. - 9780819496157
  • Konferensbidrag (refereegranskat)abstract
    • The current instrumentation plan for the E-ELT foresees a High Resolution Spectrograph conventionally indicated as HIRES. Shaped on the study of extra-solar planet atmospheres, Pop-III stars and fundamental physical constants, HIRES is intended to embed observing modes at high-resolution (up to R=150000) and large spectral range (from the blue limit to the K band) useful for a large suite of science cases that can exclusively be tackled by the E-ELT. We present in this paper the solution for HIRES envisaged by the "HIRES initiative", the international collaboration established in 2013 to pursue a HIRES on E-ELT.
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31.
  • Cocolios, T. E., et al. (författare)
  • Early onset of deformation in the neutron-deficient polonium isotopes
  • 2012
  • Ingår i: Journal of Physics, Conference Series. - : IOP Publishing. - 1742-6588 .- 1742-6596. ; 381:1, s. 012072-
  • Tidskriftsartikel (refereegranskat)abstract
    • In-source laser spectroscopy has been performed at CERN-ISOLDE with the RILIS laser ion source on 191-204,206,208-211,216,218Po. New information on the β decay of 199Po were extracted in the process, challenging previous results. Large-scale atomic calculations were performed to extract the changes in the mean-square charge radius δr 2 from the isotope shifts. The δ«r» 2 for the even-A isotopes reveal a large deviation from the spherical droplet model for N < 116.
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32.
  • Cocolios, T. E., et al. (författare)
  • Structure of Pb-191 from alpha- and beta-decay spectroscopy
  • 2010
  • Ingår i: Journal of Physics G. - : IOP Publishing. - 0954-3899 .- 1361-6471. ; 37:12, s. 125103-
  • Tidskriftsartikel (refereegranskat)abstract
    • Complementary studies of Pb-191 have been made in the beta decay of Bi-191 at LISOL (CRC) and in the alpha decay of Po-195 at ISOLDE (CERN). Fine structures in the alpha decay of the low-spin and high-spin isomers of 195Po have been fully resolved. Identification of the parent state is made possible via isomer selection based on narrow-band laser frequency scanning. The alpha-particle and gamma-ray energies have been determined with greater precision. New alpha-particle and. gamma-ray energies are identified. Branching ratios in the decay of Po-195 and Pb-191 have been examined.
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33.
  • Seliverstov, M. D., et al. (författare)
  • Electromagnetic moments of odd-A Po-193-203,Po-211 isotopes
  • 2014
  • Ingår i: Physical Review C. Nuclear Physics. - 0556-2813 .- 1089-490X. ; 89:3, s. 034323-
  • Tidskriftsartikel (refereegranskat)abstract
    • Hyperfine splitting parameters have been measured for the neutron-deficient odd-mass polonium isotopes and isomers Po-193-203(g,m), Po-209,Po-211. The measurement was performed at the ISOLDE (CERN) online mass separator using the in-source resonance ionization spectroscopy technique. The magnetic dipole moments mu and spectroscopic electric quadrupole moments Q(S) have been deduced. Their implication for the understanding of nuclear structure in the vicinity of the closed proton shell at Z = 82 and the neutron mid-shell at N = 104 is discussed. For the most neutron-deficient nuclei (A = 193,195,197), a deviation of mu and QS from the nearly constant values for heavier polonium nuclei was observed. Particle-plus-rotor calculations with static oblate deformation describe the electromagnetic moments for these nuclei well, provided a gradual increase of a mean deformation when going to lighter masses is assumed for the polonium nuclei with A < 198.
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