Results 1 - 10 of 1301
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[en] Published H1 fragmentation function data in the Breit frame of reference are compared with a NLO prediction with and without a power-correction ansatz to describe limitations in phase space. (author)
[en] Model-independent estimates obtained for the Breit-Wigner parameters of the S11(1535) and S11(1650) nucleon resonances from the latest experimental data on the photoproduction of eta mesons on protons are reported.
[en] The lifetime formula Τ=h/Σ for Breit-Wigner resonances, which is conventionally derived from the assumption of exponential decay, is obtained rigorously from a general formulation of decay and unstable states is exactly exponential and that the scattering time delay for these states is identical to the lifetime itself. (Auth.)
[en] This report gives a quantitative assessment of the temperature dependence of thermal resonances. The psi-formalism which is generally used for the calculation of Doppler-broadened resonances is not sufficently accurate in this region. For this reason a code RESON based on more accurate formulas has been developed. In addition to the absolute changes of thermal cross sections, due to rises of temperature, temperature coefficents and interference effects the consequences of this temperature dependence on the multiplication factor of a Wigner-Seitz-cell has been calculated. The results are of interest for reactor physics as well as for reactor safety. (author)
[en] The radiative proton capture 13C(p,γ)14N and the inverse 14N(γ,p)13C reactions show unusually narrow and strong resonance peaks at Ep=1.7476 MeV and Eγ=9.172 MeV, respectively. In the present work, calculations of the cross sections for the 13C(p,γ)14N and the 14N(γ,p)13C reactions are performed using both the Breit-Wigner single-resonance formula and the radiative direct-capture model. The result calculated using the direct-capture reaction theory implies that the strong resonance peak in the cross section 13C(p,γ)14N at Ep=1.7476 MeV is due to the capture of particles having a d3/2 wave by the 13C core nucleus
[en] In a recent paper Plastino and Rocca (2016)  we have demonstrated the possible existence of Tsallis' q-Gamow states. Now, accelerators' experimental evidence for Tsallis' distributions has been ascertained only at very high energies. Here, instead, we develop a different set of q-Gamow states for which the associated q-Breit–Wigner distribution could easily be found at intermediate energies, for which accelerators are available at many locations. In this context, it should be strongly emphasized Vignat and Plastino (2009)  that, empirically, one never exactly and unambiguously “detects” pure Gaussians, but rather q-Gaussians. A prediction is made via Eq. (3.4).
[en] We discuss several methods which can be used to distinguish the graviton resonances of the Randall-Sundrum model from the graviton-like resonances which may occur in other theories. The Breit-Wigner line shape of the RS graviton is found to be particularly useful. In particular we show that the ''effective'' graviton resonance present in the model of Dvali et al. can be distinguished from those of the Randall-Sundrum scenario for a reasonably wide range of model parameters
[en] In this paper we studied this state using resonance scan technique for the PANDA experiment (antiProton ANnihilation at DArmstadt), one of the key project under design for the Facility for Antiproton and Ion Re- search (FAIR) at GSI, Germany. It will be using cooled and highly intense antiproton beam provided by High Energy Storage Ring (HESR) with energy between 1.5 GeV and 15 GeV, interacting with various internal targets. The PANDA detector is multi purpose detector, covering a 4π solid angle. The goal of this experiment covers a wide range of high precision hadron spectroscopy, particular the search for exotic states in charmonium region