Investigation of the Nuclear Stopping Mechanism by Heavy Particle Range Measurements in Isotopic Media

1971 ◽  
Vol 49 (16) ◽  
pp. 2106-2117 ◽  
Author(s):  
J. Leon ◽  
N. H. Steiger-Shafrir
Keyword(s):  
Experimental Study ◽  
Isotope Effect ◽  
High Precision ◽  
Power Law ◽  
Heavy Particle ◽  
Heavy Isotope ◽  
Nuclear Stopping ◽  
Range Measurements ◽  
Thomas Fermi ◽  
Mass Ratios

An experimental study of the nuclear stopping mechanism has been carried out by performing high precision range and range straggling measurements of 96.5 keV 224Ra α-disintegration recoil particles in the following isotopic gases: H2/D2/T2,3He/4He, 14N2/15N2,16O2/18O2, and 20Ne/22Ne. Distinct range differences for light to heavy isotope mass ratios up to about 0.9 were determined. The results obtained establish clearly that the prediction of the isotope effect of the stopping medium, as derived from the Lindhard theory by using the power law potential as an approximation to the Thomas–Fermi potential, is to a good degree of accuracy, confirmed by experiment.

Experimental Study of Springback Emulation System with High Precision

2007 ◽  
Author(s):  
Yang Guo-biao ◽  
Fang Ru-hua ◽  
Zeng Wei-ming ◽  
Zhu Qi-rong
Keyword(s):  
Experimental Study ◽  
High Precision

scholarly journals High-precision measurements of cementless acetabular components using model-based RSA: An experimental study

2007 ◽  
Vol 78 (4) ◽  
pp. 463-469 ◽  
Author(s):  
Thomas Baad-Hansen ◽  
Søren Kold ◽  
Bart L Kaptein ◽  
Kjeld Søballe
Keyword(s):  
Experimental Study ◽  
High Precision ◽  
Precision Measurements ◽  
Model Based ◽  
Acetabular Components

scholarly journals Evaluation Method and Experimental Study on Stationarity of High-Precision Linear Motion

2019 ◽  
Vol 1187 (4) ◽  
pp. 042016
Author(s):  
Yifan Zhou ◽  
Xingbao Liu ◽  
Yangqiu Xia ◽  
Shaopeng Cai
Keyword(s):  
Experimental Study ◽  
High Precision ◽  
Evaluation Method ◽  
Linear Motion

Astrometry and Spectroscopy as Tools Toward Visual-Binary Masses

1992 ◽  
Vol 135 ◽  
pp. 273-275
Author(s):  
W.D. Heintz
Keyword(s):  
High Precision ◽  
Main Sequence ◽  
Mass Determination ◽  
Orbital Elements ◽  
High Quality ◽  
Visual Binary ◽  
Mass Ratios ◽  
The Status ◽  
Sequence Components

Following the diversified topic of this conference, let me present a variety of comments — not all new, but resulting from a long string of stars drifting across the desk. The chase after visual orbital elements is not exactly a self-purpose but is aiming at further data, in particular, at good masses. The last published lists of high-quality mass determination represent the status of 20 years ago; but a compilation at this time would probably not last long as the progress promises to quicken.We have 1000 positional (visual/photographic/speckle) orbits, among them about 700 acceptable in the range from fair to definitive. Yet less than 10% of them give good component masses. Most of them are outside the range of parallax measures with the requisite, high precision (that unfortunatly holds for the Hyades); some frustrate the parallax measurer by displaying wedge– and peanut–shaped images, and the more exciting cases of abnormal, non-main–sequence components often cannot get good mass ratios owing to large distances or long periods.

Settling behavior of non-spherical particles in power-law fluids: Experimental study and model development

Particuology ◽  
2019 ◽  
Vol 46 ◽  
pp. 30-39 ◽  
Author(s):  
Zhengming Xu ◽  
Xianzhi Song ◽  
Gensheng Li ◽  
Zhaoyu Pang ◽  
Zhaopeng Zhu
Keyword(s):  
Experimental Study ◽  
Power Law ◽  
Model Development ◽  
Spherical Particles ◽  
Power Law Fluids ◽  
Settling Behavior

scholarly journals The Temperature Dependence of the Isotope Effect for Electromigration of Potassium Ions in Molten Potassium Nitrate

1968 ◽  
Vol 23 (11) ◽  
pp. 1779-1782
Author(s):  
Arnold Lundén ◽  
Alf Ekhed
Keyword(s):  
Thermal Decomposition ◽  
Temperature Dependence ◽  
Isotope Effect ◽  
Separation Factor ◽  
Mass Effect ◽  
Potassium Nitrate ◽  
Relative Difference ◽  
Potassium Ions ◽  
Heavy Isotope ◽  
Significant Enrichment

The relative difference (Δb/b) between the electromigration mobilities of 39K and 41K in molten KNO3 has been measured over the range 354° to 586°C. The mass effect, μ= (Δb/b)/(Δm/m), becomes larger when the temperature is increased, following the relation—,u =0.0385+0.000124 (t-337)where t is the temperature in °C. Due to thermal decomposition, the nitrate is partly converted to nitrite, but it is proved by performing experiments with different initial concentrations of nitrite, that the isotope effect for potassium is not influenced noticeably by the concentration of the anions.The experiment is designed to give an enrichment of the heavy isotope 41K in a small anode compartment and in the upper part of the separation tube. However, it was possible to establish that a slight, but significant, enrichment of the light isotope 39K was obtained in the lower part of the separation tube, i. e. just above the opening into the large cathode compartment. A separation factor of 1.003 was estimated for this enrichment effect, which is due to non-ideal conditions of the experiment.

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