4,573,817 research outputs found
Coulomb excitation of Ni at safe energies
The value in Ni has been measured using Coulomb
excitation at safe energies. The Ni radioactive beam was
post-accelerated at the ISOLDE facility (CERN) to 2.9 MeV/u. The emitted
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
2.8 10 efm is in good agreement with the value
measured at intermediate energy Coulomb excitation, confirming the low
transition probability.Comment: 4 pages, 5 figure
Chemical capacitance proposed for manganite-based ceramics
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
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
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
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
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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