A method to estimate a contribution of Ge(n,n′) reaction to the low-energy part of gamma spectra of HPGe detectors

2013 ◽  
Vol 709 ◽  
pp. 8-11 ◽  
Author(s):  
M. Krmar ◽  
J. Hansman ◽  
N. Jovančević ◽  
N. Lalović ◽  
J. Slivka ◽  
...  
Keyword(s):  
Low Energy ◽  
Energy Part ◽  
Hpge Detectors ◽  
Gamma Spectra

scholarly journals Reversible Charge Transfer with Single‐Walled Carbon Nanotubes Upon Harvesting the Low Energy Part of the Solar Spectrum

Small ◽  
2020 ◽  
Vol 16 (8) ◽  
pp. 1906745 ◽  
Author(s):  
Arjun Menon ◽  
Yuri L. Slominskii ◽  
Jan Joseph ◽  
Oleg P. Dimitriev ◽  
Dirk M. Guldi
Keyword(s):  
Carbon Nanotubes ◽  
Charge Transfer ◽  
Solar Spectrum ◽  
Single Walled Carbon Nanotubes ◽  
Low Energy ◽  
Single Walled Carbon ◽  
Energy Part ◽  
Walled Carbon Nanotubes

The Spacecraft Potential’s Influence on the FOV of Rosetta-ICA at Low Ion Energies

2020 ◽  
Author(s):  
Sofia Bergman ◽  
Gabriella Stenberg Wieser ◽  
Martin Wieser ◽  
Fredrik Johansson ◽  
Anders Eriksson
Keyword(s):  
Debye Length ◽  
Low Energy ◽  
In Situ Techniques ◽  
Positive Ions ◽  
Spacecraft Potential ◽  
Energy Part ◽  
Ion Energies ◽  
Low Energies ◽  
Composition Analyzer ◽  
Low Energy Ions

<p><span>Low-energy ions play important roles in many processes in the environments around various bodies in the solar system. At comets, they are, for example, important for the understanding of the interaction of the cometary particles with the solar wind, including the formation of the diamagnetic cavity. </span></p><p><span>Unfortunately, spacecraft charging makes low-energy ions difficult to measure using in-situ techniques. The charged spacecraft surface will attract or repel the ions prior to detection, affecting both their trajectories and energy. The affected trajectories will change the effective FOV of the instrument. A negatively charged spacecraft will focus incoming positive ions, enlarging and distorting the FOV.</span></p><p><span>We model the low-energy FOV distortion of the Ion Composition Analyzer (ICA) on board Rosetta. ICA is an ion spectrometer measuring positive ions with an energy range of a few eV to 40 keV. Rosetta was commonly charged to a negative potential throughout the mission, and consequently the positive ions were accelerated towards the spacecraft before detection. This distorted the low-energy part of the data. We use the Spacecraft Plasma Interaction Software (SPIS) to simulate the environment around the spacecraft and backtrace particles from the instrument. We then compare the travel direction of the ions at detection and infinity, and draw conclusions about the resulting FOV distortion. We investigate the distortion for different spacecraft potentials and Debye lengths of the surrounding plasma. </span></p><p> <span>The results show that the effective FOV of ICA is severely distorted at low energies, but the distortion varies between different viewing directions of the instrument. It is furthermore sensitive to changes in the Debye length and we observe a small non-linearity in the relation between FOV distortion, ion energy and spacecraft potential. Generally, the FOV is not significantly affected when the energy of the ions is above twice the spacecraft potential. </span></p>

INVESTIGATION OF DEFECT INP(001) SURFACE BY THE METHOD OF LOW ENERGY ION SCATTERING

2019 ◽  
Vol 21 (6) ◽  
pp. 356-361
Author(s):  
M. Karimov ◽  
U. Kutliev ◽  
M. Otaboev
Keyword(s):  
Surface Layer ◽  
Defect Structure ◽  
Binary Collision ◽  
Low Energy ◽  
Ion Scattering ◽  
Energy Distributions ◽  
Low Energy Ion Scattering ◽  
Energy Part ◽  
Grazing Scattering ◽  
Collision Approximation

Investigation of grazing scattering of 3 keV Ar+ and Xe+ ions from the defect surface InP(001) are reported. Computer simulations based on the binary collision approximation permit one to carry out a quantitative analysis of data. It is determined that energy distributions of reflected ions directly depend on the defect structure of the topmost surface layer, and these defects form some peaks in low energy part of energy distribution.

A general solution condition for collisionless sheaths

1987 ◽  
Vol 38 (2) ◽  
pp. 287-300 ◽  
Author(s):  
Geoffrey L. Main ◽  
S. H. Lam
Keyword(s):  
General Solution ◽  
Trapped Ions ◽  
Low Energy ◽  
Ion Distribution ◽  
Bohm Criterion ◽  
Energy Part ◽  
Solution Condition ◽  
Low Energy Ions ◽  
Special Case ◽  
Self Consistency

A general solution condition for collisionless sheaths is developed. Previous work has assumed that the Bohm criterion or the generalized Bohm criterion ensures a self-consistent sheath solution. This paper shows that for nonmonotonic collisionless sheath structures, such as double sheaths containing trapped ions, the generalized Bohm criterion is a necessary but not a sufficient condition. The general solution condition developed is always sufficient and the generalized Bohm criterion is shown to be special case of it. The general solution condition is applied to a double emitter sheath containing trapped ions. First, it is shown that the low-energy part of the plasma ion distribution coming into the sheath cannot be neglected as claimed in some analyses, because the shift in mean ion velocity through the pre-sheath (generalized Bohm speed) depends strongly on low-energy ions. Second, it is shown that the presence of trapped ions moves the point of critical self-consistency away from the collisionless sheath-neutral plasma asymptotic match and into the collisionless sheath. Consequently, both the sheath structure and the generalized Bohm speed depend on the amount of trapped ions. Thus collisional effects may dominate the structure of a presumably collisionless sheath through the trapping mechanism and the collisional pre-sheath which determines the low-energy ion component entering the collisionless sheath.

The low energy part of spectra delayed neutrons from precursors of87Br

1986 ◽  
Vol 94 (1-4) ◽  
pp. 141-144 ◽  
Author(s):  
Boris Maksyutenko ◽  
Yuriy Balakshev ◽  
Sviatoslav Ignatyev
Keyword(s):  
Low Energy ◽  
Delayed Neutrons ◽  
Energy Part

scholarly journals The low energy β-rays of radium E

1934 ◽  
Vol 147 (862) ◽  
pp. 442-454 ◽  
Keyword(s):  
Energy Loss ◽  
Continuous Spectrum ◽  
Energy Region ◽  
High Energy ◽  
Experimental Information ◽  
Low Energy ◽  
Expansion Chamber ◽  
High Energy Part ◽  
Energy Part ◽  
Γ Ray

The object of this work was to obtain information about the shape of the low energy end of the continuous β-ray spectrum of radium E, an element convenient because of its negligible γ-ray emission. The failure of theory to explain the continuous spectrum makes it of interest to obtain all possible experimental information, and although much is now known about the high energy part of the curve, the low energy region has remained obscure owing to certain experimental difficulties. The chief of these has been the contamination of the low energy end of the curve by rays reflected with unknown energy loss from the material on which the radioactive body was deposited. This effect can be eliminated by mounting it on sufficiently thin metal leaf so that no particles can be reflected with appreciable loss of energy. Such a source would be too weak to use in a magnetic spectrograph, and the method therefore adopted in this work was out to mount it in a Wilson expansion chamber and take stereoscopic photographs from which the ranges of any slow tracks formed could be measured, a method already used by the writer for radium D.

Preliminary Study Of the Behavior Of HPGe Detectors With Ion Implanted Contacts in the Ultralow-Energy X-Ray Region

1981 ◽  
Vol 25 ◽  
pp. 23-30 ◽  
Author(s):  
M. Slapa ◽  
J. Chwaszczewska ◽  
J. Jurkowski ◽  
A. Latussynski ◽  
G.C. Huth ◽  
...  
Keyword(s):  
Hpge Detector ◽  
Low Energy ◽  
Entrance Window ◽  
X Rays ◽  
X Ray ◽  
Ultralow Energy ◽  
Hpge Detectors ◽  
Preliminary Study ◽  
First Time ◽  
Ion Implanted

AbstractPreliminary study of performance of an HPGe detector with an ion implanted entrance window in the spectrometry of the ultralowenergy x-rays is presented.For the first time it has been shown that almost symmetric photopeaks and absence of low energy tailing can be obtained in this region from HPGe detectors.

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