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Showing 1 to 20 of 125 for “"decay rate"”.
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Measurement of the Decay Rate of the Negative Positronium Ion
… far limited to a first observation and a single decay rate measurement. With a precision of 4.3%, its error is still an order of magnitude larger than the theoretical uncertainty. In this thesis, after giving a short review of the currently available theoretical results, a new determination of …
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Photon decay rate of sigma plus from unsubtracted dispersion relations
… integral representations for the weak photon decay amplitudes Fl and F2. The integrals involve the magnetic and electric dipole amplitudes M and .1 Eo+ of the photopion production. They also involve the pion-nucleon scattering phase shifts of the states Pll, P3l, Sll and S3l , The integrals …
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A measurement of the relative decay rate of the charm quark into leptons
The inclusive rate of leptons produced from charmed particle decays (from Z -> charm anticharm) has been measured using a data sample of four million hgadronic Z decays recorded by the ALEPH experiment at LEP from 1991 to 1995. The analysis uses a double-tag and is self-calibrating, i.e. it makes …
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An upper limit on the decay rate of K°L-> pi+ pi- gamma
… the film from a spark chamber, experiment on KL decays performed in the 280 beam line of the ZGS at the Argonne National Laboratory"" we undertook a search for the decay mode K°L-> pi+ pi- gamma The charged decay products were momentum analyzed in a magnet and identified in a set of range-shower …
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Numerical calculations of the decay rate of a false vacuum for a modified quartic potential
… decades ago. It suggests that false vacuum decay occurs via a quantum tunneling process, with the nucleation of a bubble of true vacuum, which, as it expands, transforms the metastable false vacuum into the more stable phase. The well-known procedure to calculate the tunneling rate uses an …
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An Upper Limit on the Decay Rate of Neutral K(l)-Meson Going to (pi-Plus,pi-Minus,photon)
Made available in DSpace on 2015-05-12T21:41:48Z (GMT). No. of bitstreams: 2 license.txt: 4848 bytes, checksum: 96035ab3f5e1c23cc7138a224ce498bd (MD5) 6901467.PDF: 1753261 bytes, checksum: ca495cc50004fcb9dc5334f096f6967b (MD5) Previous issue date: 1968
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A Study of the Physical Properties of Latex as Related to Orthodontic Tooth Movement
… have long been used in orthodontics, and force decay has always been a disadvantage. Reports differ on the load-deflection properties of rubber. Decay in elastic bands has ranged from 8% to 74.9%, depending on test conditions. A study was designed to ascertain (1) whether better quality controls …
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Violation of CP invariance in weak interactions
… and CP violating non-leptonic processes are generated by the same primary interaction. This interaction is used to calculate the s-wave amplitudes of hyperon non-leptonic decays, the K1 -> 2pi decay rate and the decay rate of the CP violating process K2 -> 2pi. The neutron electric dipole moment, …
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Two-Photon Ionization of the Calcium 4S3D 1D2 Level in an Optical Dipole Trap
… the trap and are detected to determine the trap decay rate. By measuring this decay rate as a function of 488 nm intensity, we determine the 1F3 photo-ionization cross section at this wavelength to be approximately 230 Mb.
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Spot evolution on the red giant star XX Triangulum
… manifestations of strong magnetic fields. Their decay rate is directly related to the magnetic diffusivity, which itself is a key quantity for the deduction of an activity cycle length. So far, no single starspot decay has been observed, and thus no stellar activity cycle was inferred from its …
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Amino acid interactions of spiropyran
… study was then carried out to examine how the rate of decay of the coloured merocyanine back to the closed spiropyran was affected by the presence of amino acids. Results show that there are significant differences in the decay rate depending on which amino acid was present. There are several …
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Experimental investigation of normal, sonic injection through a wedge-shaped nozzle into supersonic flow
… was conducted. The expansion ratio and the mass rate of flow of both nozzles were matched in order to determine the effect of the geometric difference only. 'Decay rate, penetration, and jet area growth rate were used to compare the mixing performance of the nozzles. Oil flow photography was used …
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Persistence of Bacteroides ovatus under simulated sunlight irradiation
… polymerase chain reaction (qPCR) detection, the decay rates of B. ovatus were determined in the presence of exogenous photosensitizers and salinity up to 39.5 parts per thousand at 27oC. UVB was found to be important for B.ovatus decay, averaging a four log10 of decay over 6 h of exposure without …
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The Reaction Kinetics of Neutral Free Radicals and Radical Ions Studied by Laser Flash Photolysis
… systems. In addressing this concern, absolute rate constants and Arrhenius parameters for hydrogen abstraction by t-butoxyl radical were measured for a broad class of substrates including amines, hydrocarbons, and alcohols using laser flash photolysis. Initially, no obvious reactivity …
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Multiscale analysis of financial volatility
… analysis over Fourier methods are demonstrated. In the second section, the statistical properties of financial returns at 1-day, 5-day and 10-day sampling intervals are studied using S&P500 index for over a decade, and the links between dependence properties of financial returns at lower …
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Hydrogen peroxide in the Halls Brook Holding Area, a small meromictic lake
… an adjacent Superfund site. Inflow and outflow rates and depth profiles of temperature, conductivity, dissolved oxygen, pH, and redox potential were measured at HBHA between May 1997 and June 1998. These data were used to characterize the lake structure and chemistry and to calculate groundwater …
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Airflow Analysis in Mechanically Ventilated Obstructed Rooms
It was concluded that for typical room flowrates and inlet types the room air distribution system is obstruction ratio independent. Local velocities and standard deviations varied with each obstruction setup and inlet combination. However, average air velocities and turbulence intensities were not …
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Jost Functions for Jacobi Operators with Super-exponentially Decaying Parameters
The decay of the parameters for a Jacobi operator is related to the analyticity of the Jost function associated with J, which is in turn related to the spectral measure of J. Damanik and Simon demonstrated the equivalence between the exponential decay of these parameters and the analyticity of the …
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Precise energy decay rates for some viscoelastic and thermo-viscoelastic rods
… or thermal coupling) may not improve the rate of energy decay. The situation where the viscoelastic stress relaxation modulus decreases to its (positive) equilibrium modulus at a subexponential rate, e.g., like (1 + t)<sup>-x</sup> + E, where α > 0, E > 0 is examined. In this case, the …
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Analysis of the neutral D-meson decay to a neutral kaon and two neutral pions
… plot, contributing about one-third of the total decay rate, while the K*(892) is the dominant K0S PI0 contribution. Using three tag modes and correcting for quantum correlations we determine that the D0 to K0S PI0 PI0 branching ratio is 1.059% with a statistical uncertainty of 0.049% and a …
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