Etude paramétrique de l'enrichissement en carbone-13 dans la décomposition polyphotonique de CF3Cl

1980 ◽  
Vol 58 (9) ◽  
pp. 913-917 ◽  
Author(s):  
M. Gauthier ◽  
C. Willis ◽  
P. A. Hackett
Keyword(s):  
Incident Energy

The yield and 13C content of the product C2F6 were measured following the multiphoton infrared decomposition of CF3Cl. These factors were studied as a function of the activation frequency ω, of the pressure of CF3Cl, of the temperature T, and of the incident energy E0. As in the case of CF3Br and CF3I the yield increases according to P2E02. [Journal translation]

Time-Current-Voltage Overcurrent Scheme for Reliable Microgrids Protection Considering Arc Flash Incident Energy

2020 ◽  
Author(s):  
Saad. M. Saad ◽  
Naser El Naily ◽  
Abdelsalam Elhaffar ◽  
T. Hussein ◽  
Faisal A. Mohamed
Keyword(s):  
Incident Energy ◽  
Current Voltage ◽  
Arc Flash

MICROSCOPIC APPROACH TO SCATTERING OF UNSTABLE NUCLEI

2010 ◽  
Vol 25 (21n23) ◽  
pp. 1754-1758
Author(s):  
MASANOBU YAHIRO ◽  
KOSHO MINOMO ◽  
KAZUYUKI OGATA ◽  
YOSHIFUMI R. SHIMIZU ◽  
TAKUMA MATSUMOTO ◽  
...  
Keyword(s):  
Energy Range ◽  
Incident Energy ◽  
Optical Potential ◽  
Recent Progress ◽  
Proton Scattering ◽  
Microscopic Approach ◽  
Unstable Nuclei ◽  
Coupled Channels ◽  
Localized Form

This article is composed of three subjects. First, the relation between the method of continuum-discretized coupled channels (CDCC) and the Faddeev theory is clarified to show the validity of CDCC. Second, CDCC is applied to four-body reactions such as (6 He , nn 4 He ) as an example of recent progress in CDCC. Third, we propose a microscopic version of CDCC in which a localized form of the microscopic nucleon-nucleus optical potential is used as an input of CDCC calculation instead of the phenomenological optical potential commonly used. The validity of the Brieva-Rook localization is shown for the proton scattering in a wide incident-energy range.

scholarly journals Formation of HCN+ in collisions of N+ and N2+ with a self-assembled propanethiol surface on gold

2021 ◽  
Author(s):  
Faro Hechenberger ◽  
Siegfried Kollotzek ◽  
Lorenz Ballauf ◽  
Felix Duensing ◽  
Milan Ončák ◽  
...  
Keyword(s):  
Energy Range ◽  
Incident Energy ◽  
Gold Surface ◽  
Self Assembled Monolayer ◽  
Polycrystalline Gold ◽  
Self Assembled

Collisions of N+ and N2+ with C3 hydrocarbons, represented by a self assembled monolayer of propanethiol on a polycrystalline gold surface, were investigated by experiments over the incident energy range between 5 eV and 100 eV.

Effect of Substrate Temperature and Incident Energy for Alloyzation of Co onto Cu(001) Substrate

2008 ◽  
Vol 47-50 ◽  
pp. 375-378 ◽  
Author(s):  
Zheng Han Hong ◽  
Shun Fa Hwang ◽  
Te Hua Fang
Keyword(s):  
Molecular Dynamics ◽  
Distribution Function ◽  
Substrate Temperature ◽  
Radial Distribution Function ◽  
Radial Distribution ◽  
Incident Energy

The mixing situation of Co atoms implanting onto Cu(001) substrate is investigated with regard to incident energy and substrate temperature by molecular dynamics. The results indicate that higher substrate temperature and/or incident energy will result in higher intermixing between the incident atoms and the substrate atoms. Furthermore, the value of the first peak of the radial distribution function (RDF) becomes lower and wider for the Co-Cu system as the substrate temperature and/or incident energy are increased.

Calculation of proton total reaction cross sections for some target nuclei in incident energy range of 10–600 MeV

2010 ◽  
Vol 73 (10) ◽  
pp. 1700-1706 ◽  
Author(s):  
H. Büyükuslu ◽  
A. Kaplan ◽  
A. Aydin ◽  
E. Tel ◽  
G. Yıldırım
Keyword(s):  
Energy Range ◽  
Cross Sections ◽  
Incident Energy ◽  
Reaction Cross ◽  
Total Reaction ◽  
Reaction Cross Sections

scholarly journals Nuclear excitation and disintegration collisions involving strong Interaction─I

1937 ◽  
Vol 162 (911) ◽  
pp. 529-556 ◽  
Keyword(s):  
Strong Interaction ◽  
Incident Energy ◽  
High Probability ◽  
Collision Cross Section ◽  
Energy Levels ◽  
Stable Complex ◽  
Nuclear Excitation ◽  
Resonance Effects ◽  
Resonance Phenomena ◽  
Probability Of Capture

The study of collisions between nuclear particles has developed to a remarkable extent with the discovery of the neutron and the introduction of artificial methods for effecting nuclear disintegration. It has been found in the last few years that the interpretation of the observed results is by no means as simple as was first expected. This situation is most apparent when the explanation of the variation of probability of capture of slow neutrons by different nuclei is considered. This probability varies in a very irregular manner from element to element and pronounced selective effects occur in certain cases. Attempts to explain (Elsasser and Perrin 1935; Bethe 1935) these resonance phenomena in terms of the usual approximations of quantum collision theory were soon found to be inadequate, All such attempts were based on the assumption that the Chance of a nuclear collision being elastic is high compared with that of its resulting in capture or excitation. A high probability of capture (with emission of radiation) or excitation could then only appear together with a high probability of elastic collision and this is frequently contradicted by the experimental results. The sharpness of the observed resonance phenomena was also difficult to under­stand on this basis. It was first pointed out by Bohr (1936) that the initial assumptions concerning the probability of elastic collisions, virtually involving the treatment of the elastic scattering as a one-body problem in the first approximation, cannot be valid for nuclei in which the particles, even is existing separately in the nuclei at all, are so closely packed. On making a close collision with a nucleus a particle, such as an α -particle, neutron or proton, comes into close and strong interaction with a number of nuclear particles and its incident energy becomes distributed among them. It is only when a particular particle receives sufficient energy to leave the quasi-stable complex formed that a disintegration particle is emitted. (This may of course be the original incident particle, in which case the collision would be an elastic or excitation one.) Otherwise the surplus energy is emitted as radiation. The resonance phenomena arise from the energy levels of the quasi-stable complex. If the incident energy is such that the total energy is equal or nearly equal to that of one of these energy levels, the range of interaction and hence the collision cross-section is quite large. This point of view must be adopted not only when dealing with neutron collisions but in all cases in which the impinging particle does not possess an energy greatly in excess of the minimum necessary for the process to occur. Disintegrations produced by charged particles, in which resonance effects have been observed for some time (Feather 1937, P. 154), must therefore be capable of description in this way.

Sputtering of Graphite by Hydrogen Isotopes in the Fusion Environment: A Molecular Dynamics Simulation Study

2018 ◽  
Vol 4 (4) ◽  
Author(s):  
Qiang Zhao ◽  
Yang Li ◽  
Zheng Zhang ◽  
Xiaoping Ouyang
Keyword(s):  
Molecular Dynamics ◽  
Incident Energy ◽  
Large Scale ◽  
Incident Angle ◽  
Hydrogen Isotopes ◽  
Dynamics Simulation ◽  
Calculation Results ◽  
Sputtering Yield ◽  
Increasing Temperature ◽  
Sputtering Yields

The sputtering of graphite due to the bombardment of hydrogen isotopes is crucial to successfully using graphite in the fusion environment. In this work, we use molecular dynamics to simulate the sputtering using the large-scale atomic/molecular massively parallel simulator (lammps). The calculation results show that the peak values of the sputtering yield are between 25 eV and 50 eV. When the incident energy is greater than the energy corresponding to the peak value, a lower carbon sputtering yield is obtained. The temperature that is most likely to sputter is approximately 800 K for hydrogen, deuterium, and tritium. Below the 800 K, the sputtering yields increase with temperature. By contrast, above the 800 K, the yields decrease with increasing temperature. Under the same temperature and incident energy, the sputtering rate of tritium is greater than that of deuterium, which in turn is greater than that of hydrogen. When the incident energy is 25 eV, the sputtering yield at 300 K increases below an incident angle at 30 deg and remains steady after that.

Determining the energy-dependent X-ray flux variation of a synchrotron beamline using Laue diffraction patterns

2011 ◽  
Vol 44 (1) ◽  
pp. 177-183 ◽  
Author(s):  
Catherine Dejoie ◽  
Martin Kunz ◽  
Nobumichi Tamura ◽  
Colin Bousige ◽  
Kai Chen ◽  
...  
Keyword(s):  
Incident Energy ◽  
Flux Variation ◽  
Laue Diffraction ◽  
X Ray ◽  
Measured Flux ◽  
Highly Sensitive ◽  
Diffraction Patterns ◽  
Energy Dependent ◽  
Flux Curve

Although the spectrum originating from a superconducting bending magnet is quasi-continuous, it shows important intensity variations through its spectral range. A method to determine the incident energy-dependent flux variation based on the comparison between observed intensities and the calculated intensities of a well known structure (calcite) is presented here. It is found that the measured flux is highly sensitive to the use of correct Debye–Waller factors for the atoms of the standard crystal. By using the measured flux curve, it was possible to unambiguously index the Laue diffraction pattern of a trigonal crystal structure in its hexagonal setting. This is a crucial but difficult first step for the determination of strain and stress in materials with this symmetry, such as quartz, Mg, Ti, Znetc.

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