نتایج جستجو برای: spectral decay
تعداد نتایج: 235162 فیلتر نتایج به سال:
We report on the temporal and spectral characteristics of the early X-ray emission from the Gamma Ray Bursts GRB050126 and GRB050219A as observed by Swift. The X-ray light-curves of these 2 bursts both show remarkably steep early decays (F(t) ∝ t−3), breaking to flatter slopes on timescales of a few hundred seconds. For GRB050126 the burst shows no evidence of spectral evolution in the 20–150 k...
We review, very briefly, many of the important results arising in the study of tau lepton production and decay, with emphasis on recent results. We discuss the studies of topological and exclusive branching fractions, inclusive semi-leptonic tau decay spectral functions, extraction of QCD parameters including αS and the strange quark mass, exclusive semileptonic decays and low energy meson dyna...
Prior anechoic measurements of a small acetylene-oxygen balloon explosion were used to study spherical weak-shock decay over short ranges [Muhlestein et al., J. Acoust. Soc. Am. 131, 2422-2430 (2012)]. Here, longer-range measurements conducted at the Bonneville Salt Flats with a larger balloon are described. Waveform and spectral characteristics and comparisons of the peak pressure decay with a...
We study the modification of the decay rates of a single dipolar emitter positioned in the vicinity of metallic linear nanoantennas when higher-order plasmonic excitations are induced. We show that it is possible to effectively tune the enhancement or suppression of both the radiative and nonradiative decay processes by controlling the position and orientation of the dipole with respect to the ...
We analyze the semileptonic Bc → B∗ ull decay in the frame work of the Standard Model. We calculate the Bc to B ∗ u transition form factors in QCD sum rules. Analytical expressions for the spectral densities and gluon condensates are presented. The branching ratio of the Bc → B∗ ull decay is calculated, and it is obtained that this decay can be detectable at forthcoming LHC machines. PACS numbe...
We study the formation and the free decay of capillary turbulence on the charged surface of liquid hydrogen on the switching on, and off, of a narrowband driving force. It is observed that the decay begins from the high frequency spectral domain of the surface oscillations and is of a quasi-adiabatic character. The characteristic relaxation time of the whole turbulent cascade is close to the vi...
We prove a dispersive estimate for the time-independent Schrödinger operator H = −∆ + V in three dimensions. The potential V (x) is assumed to lie in the intersection L(R) ∩ L(R), p < 3 2 < q, and also to satisfy a generic zero-energy spectral condition. This class, which includes potentials that have pointwise decay |V (x)| ≤ C(1+ |x|)−2−ε, is nearly critical with respect to the natural scalin...
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