Superconducting Energy Gap in Fullerides

Wu, Ju‐Hui; Guo, Hongkai; Wei, Qun; Gu, Zhuquan

doi:10.1142/s0217984908016522

Cited by 20 publications

(49 citation statements)

References 22 publications

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“…Recent measurements of the differential and total QE cross section for nucleons bound in carbon by the NO-MAD [30,31] collaboration for ν μ ,ν μ energies above 4 GeV are also consistent with models which assume that the scattering is from independent nucleons with free nucleon form factors. The NOMAD analysis yields a value of M A (1.05 ± 0.02 ± 0.06 GeV).…”

Section: Qelastic-vectorsupporting

confidence: 63%

“…The ratios for the predictions of the "Larger M A (M A = 1.3) model" and "Transverse Enhancement model" are shown. The data points are the ratios for the measurements of MiniBooNE [13,14] (gray stars) and NOMAD [30,31] (purple circles). Top (a): The ratio for ν μ total QE cross sections.…”

Section: Resultsmentioning

confidence: 99%

“…Figure 11 shows the total QE cross section as function of energy. The data points are the measurements from MiniBooNE [13,14] and NOMAD [30,31] Figure 12 shows the ratio of the predictions for total QE cross section to the predictions of the "Independent Nucleon (M A = 1.014)" model as a function energy. The blue dashed line is the ratio of the predictions for the "Larger M A (M A = 1.3)" model, and the red line is ratio for the "Transverse Enhancement" model (with error bands shown as dotted red lines).…”

Section: The "Transverse Enhancement" Modelmentioning

confidence: 99%

“…11 The total QE cross section as function of energy. The data points are measurements of MiniBooNE [13,14] (gray stars) and NO-MAD [30,31] (purple circles). The predictions for the "Independent Nucleon (M A = 1.014)" model, "Larger M A (M A = 1.3) model", and "Transverse Enhancement model" are shown.…”

Section: The "Transverse Enhancement" Modelmentioning

confidence: 99%

“…The bottom (c) panel shows the predictedν μ /ν μ cross section ratio divided by the predicted ν μ /ν μ ratio for the "Independent Nucleon (M A = 1.014)" model. The data points are measurements from MiniBooNE [13,14] and NOMAD [30,31].…”

Section: The "Transverse Enhancement" Modelmentioning

confidence: 99%

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Neutrino quasielastic scattering on nuclear targets

2011

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We present a parametrization of the observed enhancement in the transverse electron quasielastic (QE) response function for nucleons bound in carbon as a function of the square of the four momentum transfer (Q 2 ) in terms of a correction to the magnetic form factors of bound nucleons. The parametrization should also be applicable to the transverse cross section in neutrino scattering. If the transverse enhancement originates from meson exchange currents (MEC), then it is theoretically expected that any enhancement in the longitudinal or axial contributions is small. We present the predictions of the "Transverse Enhancement" model (which is based on electron scattering data only) for the ν μ ,ν μ differential and total QE cross sections for nucleons bound in carbon. The Q 2 dependence of the transverse enhancement is observed to resolve much of the long standing discrepancy in the QE total cross sections and differential distributions between low energy and high energy neutrino experiments on nuclear targets.

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Section: Qelastic-vectorsupporting

confidence: 63%

Section: Resultsmentioning

confidence: 99%

Section: The "Transverse Enhancement" Modelmentioning

confidence: 99%

Section: The "Transverse Enhancement" Modelmentioning

confidence: 99%

Section: The "Transverse Enhancement" Modelmentioning

confidence: 99%

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Neutrino quasielastic scattering on nuclear targets

2011

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Measurement of Neutrino Interactions and Three Flavor Neutrino Oscillations in the T2K Experiment

Kikawa¹

2016

Springer Theses

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T2K is a long-baseline neutrino oscillation experiment. Muon neutrinos are generated by a proton beam, and are detected by near and far neutrino detectors. For a precise measurement of the neutrino oscillation, an accurate understanding of the neutrino beam and the neutrino interaction is essential. Therefore, the measurement of the neutrino beam properties and the neutrino interaction cross sections plays an important role in T2K.Neutrino event rate, neutrino beam direction and neutrino beam width were measured with the near neutrino detector called INGRID. They were confirmed to be stable within the physics requirements and agree well with the T2K neutrino flux predictions. In addition, this measurement reduced the neutrino flux uncertainty from the neutrino beam direction which was originally 7.0% at 1 GeV to 2.5%.The neutrino interaction cross sections in a few GeV region were also measured with INGRID. The charged current inclusive cross sections on iron and hydrocarbon and their cross section ratio were measured to be σ Fe CC = (1.444 ± 0.002(stat.) +0.189 −0.157 (syst.)) × 10 −38 cm 2 /nucleon, σ CH CC = (1.379 ± 0.009(stat.) +0.178 −0.147 (syst.)) × 10 −38 cm 2 /nucleon, and σ Fe CC /σ CH CC = 1.047 ± 0.007(stat.) ± 0.035(syst.), at a mean neutrino energy of 1.51 GeV. They agree well with the predicted values by the neutrino interaction models used in T2K. Since the neutrino cross section in a few GeV region is sensitive to the nuclear effect of the target material, this result demonstrates that the nuclear effect is well understood and correctly treated in the models on the 3% level. The measured charged current quasi-elastic cross sections are also consistent with the neutrino interaction models. However, the measured charged current coherent pion production cross section is significantly smaller than the prediction by the original Rein-Sehgal model that is widely used in neutrino experiments. Therefore, we reveal that the original Rein-Sehgal model breaks down in a few GeV region. Since this inconsistency is within the originally assigned uncertainty, all the cross section results from INGRID demonstrate the validity of the neutrino interaction models and their uncertainties in T2K.Finally, a neutrino oscillation analysis was performed using the neutrino flux prediction, the neutrino interaction models and the beam data in the near and far detectors. We performed a joint three-flavor neutrino oscillation analysis of the electron neutrino appearance and the muon neutrino disappearance for the first time. As the result, sin 2 2θ 13 for normal (inverted) neutrino mass hierarchy was determined to be sin 2 2θ 13 = 0.165 +0.044 −0.073 (0.191 +0.056 −0.084 ). The electron neutrino appearance in a muon neutrino beam was observed because the appearance signal corresponds to a significance of 7.3σ. We also obtained sin 2 θ 23 = 0.524 ± 0.058 (0.524 +0.058 −0.057 ) and ∆m 2 32 = (2.50 ± 0.11) × 10 −3 eV 2 (∆m 2 13 = (2.48 ± 0.11) × 10 −3 eV 2 ) for the normal (inverted) hierarchy. The measurement of sin 2 θ 23 ...

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Reconstructing f(R) modified gravity from ordinary and entropy-corrected versions of the holographic and new agegraphic dark energy models

Karami

Khaledian

2011

J. High Energ. Phys.

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Here, we peruse cosmological usage of the most promising candidates of dark energy in the framework of f (R) theory. We reconstruct the different f (R) modified gravity models in the spatially flat FRW universe according to the ordinary and entropy-corrected versions of the holographic and new agegraphic dark energy models, which describe accelerated expansion of the universe. We also obtain the equation of state parameter of the corresponding f (R)gravity models. We conclude that the holographic and new agegraphic f (R)-gravity models can behave like phantom or quintessence models. Whereas the equation of state parameter of the entropy-corrected models can transit from quintessence state to phantom regime as indicated by recent observations.

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Superconducting Energy Gap in Fullerides

Cited by 20 publications

References 22 publications

Neutrino quasielastic scattering on nuclear targets

Neutrino quasielastic scattering on nuclear targets

Measurement of Neutrino Interactions and Three Flavor Neutrino Oscillations in the T2K Experiment

Reconstructing f(R) modified gravity from ordinary and entropy-corrected versions of the holographic and new agegraphic dark energy models

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