4,573,817 research outputs found

    Coulomb excitation of 68^{68}Ni at safe energies

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    The B(E2;0+2+)B(E2;0^+\to2^+) value in 68^{68}Ni has been measured using Coulomb excitation at safe energies. The 68^{68}Ni radioactive beam was post-accelerated at the ISOLDE facility (CERN) to 2.9 MeV/u. The emitted γ\gamma rays were detected by the MINIBALL detector array. A kinematic particle reconstruction was performed in order to increase the measured c.m. angular range of the excitation cross section. The obtained value of 2.81.0+1.2^{+1.2}_{-1.0} 102^2 e2^2fm4^4 is in good agreement with the value measured at intermediate energy Coulomb excitation, confirming the low 0+2+0^+\to2^+ transition probability.Comment: 4 pages, 5 figure

    Chemical capacitance proposed for manganite-based ceramics

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    The measured value of effective electric permittivity \varepsilon_{eff} of several compounds, e.g., (BiNa)(MnNb)O_{3}, (BiPb)(MnNb)O_{3}, and BiMnO_{3} increases from a value \approx 10-100 at the low temperature range (100-300 K) up to the high value reaching the value 10^5 at high temperature range, e.g., 500-800 K. Such features suggest the manifestation of thermally activated space charge carriers, which effect the measured capacitance. The measured high-value effective permittivity of several manganite compounds can be ascribed to the chemical capacitance C_{\mu}=e^2\partial N_{i}/\partial \mu_{i} expressed in terms of the chemical potential \mu. The chemical capacitance C_{\mu}^{(cb)} = e^2 n_{C}/k_{B}T depends on temperature when the conduction electrons with density n_{C} = N_{C} \exp(\mu_{n}- E_{C})/k_{B}T are considered. The experimental results obtained for the manganite compounds, at high temperature range, are discussed in the framework of the chemical capacitance model. However, the measured capacitance dependence on geometrical factors is analysed for BiMnO_{3} indicating that the non-homogeneous electrostatic capacitor model is valid in 300-500 K range.Comment: 10 pages, 7 figure

    Prognostic Value of Computed Tomography : Measured Parameters of Body Composition in Primary Operable Gastrointestinal Cancers

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    Professor Graeme Murray, Department of Pathology, University of Aberdeen provided us access to the colorectal cancer pathology databases from which the colorectal component of the research was based. Conflict of interest There are no conflicts of interest.Peer reviewedPublisher PD

    Implications of unitarity and precision measurements on CKM matrix elements

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    Unitarity along with precision measurements of sin2\beta, V_{us} and V_{cb} allows one to find a lower bound V_{ub}\geq 0.0035 which, on using the recently measured angle \alpha of the unitarity triangle, translates to V_{ub}= 0.0035\pm 0.0002. This precise value, stable for a good deal of changes in \alpha, along with CP violating phase \delta found from unitarity allows the construction of a `precise' CKM matrix. The above unitarity based value of V_{ub} is in agreement with the latest exclusive value used as input by UTfit, CKMfitter, HFAG, however underlines the so called `tension' faced by the latest inclusive V_{ub}=0.00449 \pm 0.00033. Further, using this inclusive value of V_{ub} along with the latest sin2\beta, one finds \delta=23 ^{\rm o}- 39 ^{\rm o}, again in conflict with \delta measured in B-decays. The calculated ranges of the elements of the CKM matrix are in excellent agreement with those obtained recently by UTfit, CKMfitter and HFAG. Also, the ratio \frac{V_{ts}}{V_{td}} is in agreement with its latest measured value, whereas there is some disagreement between the `measured' and the calculated V_{td} values.Comment: 10 pages, 1 figure, incorporated latest dat

    Measurement of the 6s - 7p transition probabilities in atomic cesium and a revised value for the weak charge Q_W

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    We have measured the 6s - 7p_{1/2,3/2} transition probabilities in atomic cesium using a direct absorption technique. We use our result plus other previously measured transition rates to derive an accurate value of the vector transition polarizability \beta and, consequently, re-evaluate the weak charge Q_W. Our derived value Q_W=-72.65(49) agrees with the prediction of the standard model to within one standard deviation.Comment: 4 pages, 2 figure

    Higgs to diphoton decay rate and the antisymmetric tensor unparticle mediation

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    We study the contribution of the antisymmetric tensor unparticle mediation to the diphoton production rate of the Higgs boson and try to explain the discrepancy between the measured value of the decay width of the discovered new resonance and that of the standard model Higgs boson. We observe that tree level contribution of the antisymmetric unparticle mediation is a possible candidate to explain the measured value of the diphoton decay rate.Comment: 12 pages, 4 figure
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