Mean Lifetime of the 1612 keV Level in 37Ar

1973 ◽  
Vol 51 (10) ◽  
pp. 1039-1041 ◽  
Author(s):  
M. J. Vérucchi ◽  
R. Vaillancourt ◽  
C. Cardinal ◽  
P. Taras
Keyword(s):  
Distance Method ◽  
Mean Lifetime ◽  
Recoil Distance ◽  
The Mean

The recoil-distance method was used to measure the mean lifetime of the [Formula: see text], 1612 keV level in 37Ar. The level was populated via the 34S(α,n)37Ar reaction at Eα = 7.9 MeV. The mean lifetime was found to be 6.47 ± 0.22 ns.

The Lifetimes of the 3/2+, 975 keV Level in 25Mg and the 3/2+, 945 keV Level in 25Al

1972 ◽  
Vol 50 (18) ◽  
pp. 2198-2205 ◽  
Author(s):  
T. K. Alexander ◽  
O. Häusser ◽  
A. B. McDonald ◽  
G. T. Ewan
Keyword(s):  
Gamma Ray ◽  
Transition Probabilities ◽  
Unified Model ◽  
Distance Method ◽  
Mixing Ratios ◽  
Mean Lifetime ◽  
Recoil Distance ◽  
The Mean ◽  
The Absolute ◽  
Mean Lifetimes

The 3/2+, 975 keV level in 25Mg and the 945 keV level in 25Al were populated in the 2H(24Mg,pγ)25Mg and 2H(24Mg,nγ)25Al reactions respectively and their mean lifetimes for gamma-ray decay were measured by the recoil-distance method. The mean lifetime of the 975 keV level in 25Mg is 14.6 ± 1.5 ps and that of the 945 keV level in 25Al is 6.2 ± 1.6 ps. Using previously measured branching and mixing ratios, the absolute M1 and E2 transition probabilities have been obtained and are compared with predictions of the unified model.

scholarly journals Recoil-distance Lifetime Measurements of 47SC Levels

1982 ◽  
Vol 35 (4) ◽  
pp. 371 ◽  
Author(s):  
H Ohnuma ◽  
PB Foot ◽  
T Aoki ◽  
CG Ryan ◽  
HH Bolotin
Keyword(s):  
Excitation Energy ◽  
The Other ◽  
Distance Method ◽  
Lifetime Measurements ◽  
Coincidence Data ◽  
Recoil Distance ◽  
The Mean

The mean lives of the first excited ~- and ~+ states at 808 and 1391 keV excitation energy in 47SC were measured using the recoil-distance method (RDM). The levels of interest were populated in the 44Ca(O(, py) reaction using 9 MeV 0( beams. The mean lives extracted from the p-y coincidence data were ,(808 keV, ~-) = 22� 5 ps and ,(1391 keV, ~+) = 13 �4 ps. These results are compared with similar prior measurements on other levels of interest in 47SC as well as with those in the other Sc isotopes, and are discussed in the light of the systematics displayed.

Temperature Dependences in the O + OH → O2 + H Reaction. Quasiclassical Trajectory Calculation

1993 ◽  
Vol 58 (2) ◽  
pp. 234-243 ◽  
Author(s):  
Viliam Klimo ◽  
Martina Bittererová ◽  
Stanislav Biskupič ◽  
Ján Urban ◽  
Miroslav Micov
Keyword(s):  
Temperature Dependence ◽  
Energy Surface ◽  
Analytical Form ◽  
Mean Values ◽  
Quantum Numbers ◽  
Mean Lifetime ◽  
Temperature Dependences ◽  
Quasiclassical Trajectory Calculation ◽  
The Mean ◽  
Combustion Processes

The reaction O + OH → O2 + H in conditions of combustion of hydrocarbons and polymers was modelled by using the method of quasiclassical trajectories. The potential energy surface was determined by the multiconfiguration interaction method and fitted with the analytical form of the extended LEPS function. Attention was paid to the mean values of the vibrational and rotational quantum numbers of O2 molecules and their temperature dependence. The temperature dependence of the mean lifetime of the OOH collision complex was also examined. The calculated rate constants were analyzed and compared with the experimental data over the temperature region of the combustion processes.

Fluorescence of nitric oxide. Part 1.—Determination of the mean lifetime of the A2Σ+state

1963 ◽  
Vol 59 (0) ◽  
pp. 1720-1734 ◽  
Author(s):  
A. B. Callear ◽  
I. W. M. Smith
Keyword(s):  
Nitric Oxide ◽  
Mean Lifetime ◽  
The Mean

scholarly journals On the Absoluteness of Time

2017 ◽  
Vol 9 (3) ◽  
pp. 46
Author(s):  
Carmine Cataldo
Keyword(s):  
Analytical Solutions ◽  
Relativistic Corrections ◽  
Mean Lifetime ◽  
The Mean

This paper aims to qualitatively summarize the results up until now obtained in investigating the compatibility between the absoluteness of time and several well-known phenomena, such as the alleged increase of the mean lifetime of muons and the so-called relativistic corrections for GPS, whose explanation is commonly provided by resorting to Einstein’s Relativity. To make the discussion more flowing, we have herein preferred to completely avoid the writing of equations. All the analytical solutions, as well as several explicative figures, can be found in the first six articles cited in the references, drafted by the same author of this manuscript.

A Formula for the Mean Lifetime of Metapopulations in Heterogeneous Landscapes

2002 ◽  
Vol 159 (5) ◽  
pp. 530-552 ◽  
Author(s):  
Karin Frank ◽  
Christian Wissel
Keyword(s):  
Heterogeneous Landscapes ◽  
Mean Lifetime ◽  
The Mean

Mean Lifetime of an Embryo in the Homogeneous Nucleation from Solution of the Tetracyanoplatinates(II) of Barium, Calcium, and Magnesium

1973 ◽  
Vol 51 (20) ◽  
pp. 3435-3442 ◽  
Author(s):  
O. A. Bempah ◽  
O. E. Hileman Jr.
Keyword(s):  
Homogeneous Nucleation ◽  
Silicone Oil ◽  
Classical Model ◽  
Selective Extraction ◽  
Supersaturation Ratio ◽  
Mean Lifetime ◽  
High Supersaturation ◽  
The Mean ◽  
Calcium And Magnesium ◽  
Oil Crystallization

The mean lifetime of an embryo in the homogeneous nucleation from aqueous solution of the tetracyanoplatinates(II) of barium, calcium, and magnesium has been studied using the droplet technique. Supersaturation in the droplets was generated by selective extraction of the solvent into the surrounding silicone oil. Crystallization in the droplets was followed by photomicrography using plane polarized light.The data were analyzed using both the classical model and the mean lifetime model of Carlier and Frisch. The experimental results are consistent with the predicted relationship between the logarithm of the nucleation rate or the logarithm of the mean lifetime of an embryo and the inverse of the square of the logarithm of the supersaturation ratio at high supersaturation ratios. The calculated values of the inter-facial energy, using both models, are in close enough agreement to justify the assumptions made in the analysis.

High Temperature Laminate Characterization

2014 ◽  
Vol 2014 (HITEC) ◽  
pp. 000235-000245
Author(s):  
David Shaddock ◽  
Liang Yin
Keyword(s):  
Weight Loss ◽  
High Temperature ◽  
Printed Circuit Boards ◽  
Stress Test ◽  
Model Development ◽  
Peel Strength ◽  
Circuit Boards ◽  
Printed Circuit ◽  
Mean Lifetime ◽  
The Mean

Printed circuit boards have been reported to have limited lifetime at 200 to 250°C. Characterization and modeling high temperature laminates for application at 200 to 250°C was conducted to better quantify the mean lifetime using accelerated testing of key functional parameters. Life testing and model development was applied for via cyclic life, peel strength, and weight loss. Four high temperature laminates consisting of 2 types were evaluated. Via lifetime was characterization using Interconnect Stress Test (IST) coupons. Peel strength was tested using IPC IPC-TM-650 method 2.4.8c. Weight loss was characterized using isothermal aging. Comparison of lifetime is made between the laminate samples.

The post-synaptic action of some putative excitatory transmitter substances

1976 ◽  
Vol 192 (1109) ◽  
pp. 481-489 ◽  
Keyword(s):  
Current Fluctuations ◽  
Synaptic Action ◽  
Synaptic Noise ◽  
Mean Lifetime ◽  
The Mean ◽  
Excitatory Transmitter

L-Glutamate, L-aspartate and L-cysteate all produce current fluctuations when applied to the excitatory junctional membrane of Maia squinado . This post-synaptic ‘noise’ indicates that all three substances cause an elementary conductance event of approximately the same amplitude but with different average lifetimes. The mean lifetime of the ‘molecular shot effect’ produced by L-aspartate and L-cysteate is only about half that of L-glutamate.

DETECTING DEFECTS IN AIRCRAFT MATERIALS BY NUCLEAR TECHNIQUE (PAS)

2005 ◽  
Vol 19 (22) ◽  
pp. 3475-3482
Author(s):  
EMAD. A. BADAWI
Keyword(s):  
Aluminum Alloy ◽  
Dislocation Density ◽  
Material Science ◽  
Positron Annihilation Spectroscopy ◽  
Defect Concentration ◽  
Nuclear Technique ◽  
Nuclear Techniques ◽  
Mean Lifetime ◽  
The Mean ◽  
7075 Alloy

Positron annihilation spectroscopy (PAS) is one of the nuclear techniques used in material science. The present measurements are used to study the behavior of defect concentration in one of the most important materials — aluminum alloy — which is a 7075 alloy. It has been shown that positrons can become trapped in imperfect locations in solids and their mean lifetime can be influenced by changes in the concentration of such defects. No changes have been observed in the mean lifetime values after the saturation of defect concentration. The mean lifetime and trapping rates were studied for samples deformed up to 58.3%. The concentration of defect range varies (from 1015 to 1018 cm-3) at the thickness reduction, (from 2.3 to 58.3%). The range of the dislocation density varies (from 108 to 1011 cm/cm3).

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