Monte Carlo study of the depth and lateral range of low-energy projectiles in solids

1980 ◽  
Vol 58 (12) ◽  
pp. 1738-1747 ◽  
Author(s):  
B. M. Latta
Keyword(s):  
Monte Carlo ◽  
Numerical Solutions ◽  
Monte Carlo Study ◽  
Equal Mass ◽  
Thomas Fermi ◽  
Hartree Fock ◽  
Fermi Interaction ◽  
The Mean ◽  
Lateral Range ◽  
Good Agreement

For heavy projectiles on light targets, the experimental measurements of mean-depth and of lateral-range straggle indicate discrepancies of up to 100% in the previous numerical solutions which are based upon a Thomas–Fermi interaction potential. In contrast, the present Monte Carlo (MC) results, which are based upon a solid-state Thomas–Fermi (SSTF) interaction, are in good agreement with experiment. The present SSTF mean-depth estimates are also in good agreement with estimates based on semiempirical potentials and with estimates based on Hartree–Fock–Slater interaction potentials. There remain small discrepancies between experiment and all theoretical estimates of the mean depth. In the case of the lateral-range straggle, the present MC SSTF results are in excellent agreement with experiment. The previous large discrepancies between theory and experiment are attributed, in part, to the choice of potential and, in part, to the numerical methods used to obtain the lateral-range straggle. In addition, the present MC SSTF calculations of the mean-depth and lateral-range straggle for equal mass and light projectile on heavy target collision pairs are in closer agreement with existing numerical estimates.

scholarly journals Universal dependence of the total number albedo of photons on the mean number of photon scatterings

2011 ◽  
Vol 26 (3) ◽  
pp. 249-253 ◽  
Author(s):  
Vladan Ljubenov ◽  
Rodoljub Simovic
Keyword(s):  
Monte Carlo ◽  
Monte Carlo Simulations ◽  
Analytic Functions ◽  
Least Squares Method ◽  
Mcnp Code ◽  
Initial Photon ◽  
Aluminum Iron ◽  
Universal Dependence ◽  
The Mean ◽  
Good Agreement

This paper presents the results of research on photon reflection from plane targets based on Monte Carlo simulations performed by the MCNP code. Five materials (water, concrete, aluminum, iron, and copper) are examined in the area of initial photon energies of up to 200 keV. The values of the total number albedo for photons dependent on the initial photon energy or the mean number of photon scatterings are calculated and graphically presented. We have shown that the values of the total number albedo for different target materials, expressed as a function of the mean number of photon scatterings, are in good agreement with each other and can be approximated by simple, universal analytic functions obtained by the least squares method. The accuracy of these analytic appoximations is confirmed by their comparison with the results of PENELOPE and FOTELP Monte Carlo codes.

The Mean Projected Range and Range Straggling of Nd Ions Implanted in Silicon Carbide

2011 ◽  
Vol 474-476 ◽  
pp. 565-569
Author(s):  
Xi Feng Qin ◽  
Shuang Li ◽  
Feng Xiang Wang ◽  
Yi Liang
Keyword(s):  
Silicon Carbide ◽  
Monte Carlo ◽  
Spectrum Analysis ◽  
Monte Carlo Code ◽  
Experiment Data ◽  
Lateral Deviation ◽  
Projected Range ◽  
The Mean ◽  
The Difference ◽  
Good Agreement

In view of the influence of the projected range, the range straggling, and the lateral deviation of ions in materials on the property of device in the fabrication of photoelectric integration devices by ion implantation, the mean projected ranges and range straggling for energetic 200 – 500 keV Nd ions implanted in 6H-SiC were measured by means of Rutherford backscattering followed by spectrum analysis. The measured values are compared with Monte Carlo code (SRIM2006) calculations. It has been found that the measured values of the mean projected range Rp are good agreement with the SRIM calculated values; for the range straggling △Rp, the difference between the experiment data and the calculated results is much higher than that of Rp

Magnetic properties of a tri-decorated graphene structure: Monte Carlo study

2016 ◽  
Vol 30 (32) ◽  
pp. 1650233
Author(s):  
A. Jabar ◽  
N. Tahiri ◽  
L. Bahmad ◽  
A. Benyoussef
Keyword(s):  
Monte Carlo ◽  
Magnetic Properties ◽  
Phase Diagrams ◽  
Ground State ◽  
Magnetic Hysteresis ◽  
Hysteresis Loops ◽  
Monte Carlo Study ◽  
Magnetic Hysteresis Loops ◽  
Reduced Temperature ◽  
Good Agreement

In this paper, we study the magnetic properties of a tri-decorated [Formula: see text] graphene structure using Monte Carlo simulations (MCS). Indeed, we first elaborate the ground state phase diagrams and then, we found that from [Formula: see text] phases, the only stable configurations are: [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text] and [Formula: see text]. For low reduced temperature values, the partial magnetizations are found to be in good agreement with the corresponding ground state phase diagrams. The corresponding partial susceptibilities show a notable peak around the reduced temperature value 2.0 in the absence of the external magnetic field [Formula: see text] and crystal field [Formula: see text]. To complete this study, we present and discuss the magnetic hysteresis loops.

DIFFUSION MONTE CARLO STUDY OF GROUND STATE PROPERTIES OF QUANTUM DOTS

2001 ◽  
Vol 15 (10n11) ◽  
pp. 1443-1446 ◽  
Author(s):  
FRANCESCO PEDERIVA
Keyword(s):  
Quantum Dots ◽  
Monte Carlo ◽  
Ground State ◽  
Monte Carlo Study ◽  
Wave Functions ◽  
Local Spin Density Approximation ◽  
Density Approximation ◽  
Diffusion Monte Carlo ◽  
Hartree Fock ◽  
Parabolic Quantum Dot

We present the results of Diffusion Monte Carlo (DMC) calculations based on accurate multiconfiguration wave functions for N electrons (N≤13) confined to a parabolic quantum dot. The density and correlation energies have been computed and compared with the predictions of local spin density approximation theory (LSDA). We also computed the addition energy a function of the number of electrons in the dot, and compared them with the results of LSDA and Hartree Fock calculations. DMC results show a behavior qualitatively closer to the result of recent capacitance experiments.

scholarly journals Average Absorbed Breast Dose (2ABD) to Mean Glandular Dose (MGD) Conversion Function for Digital Breast Tomosynthesis: A New Approach

2021 ◽  
pp. 183-191
Author(s):  
‪Raffaele M Tucciariello ◽  
Rocco Lamastra ◽  
Patrizio Barca ◽  
Marine Evelina Fantacci ◽  
Antonio C Traino
Keyword(s):  
Monte Carlo ◽  
Digital Breast Tomosynthesis ◽  
Dose Assessment ◽  
Conversion Function ◽  
Breast Tomosynthesis ◽  
New Approach ◽  
Mean Glandular Dose ◽  
The Mean ◽  
Good Agreement ◽  
Dosimetric Index

Background: In this work a new method for the Mean Glandular Dose evaluation in digital breast tomosynthesis (DBT) is presented. Methods: Starting from the experimental-based dosimetric index, 2ABD, which represents the average absorbed breast dose, the mean glandular dose MGD2ABD was calculated using a conversion function of glandularity f(G), obtained through the use of Monte Carlo simulations.Results: f(G) was computed for a 4.5 cm thick breast: from its value MGD2ABD for different compressed breast thicknesses and glandularities was obtained. The comparison between MGD2ABD estimates and the dosimetric index provided in the current dosimetry protocols, following the Dance's approach, MGDDance, showed a good agreement (<10%) for all the analyzed breast thicknesses and glandularities. Conclusion: The strength of the proposed method can be considered an accurate mean glandular dose assessment starting from few and accessible parameters, reported in the header DICOM of each DBT exam.

scholarly journals TIME-DEPENDENT HARTREE-FOCK DESCRIPTION OF HEAVY IONS FUSION

2008 ◽  
Vol 17 (01) ◽  
pp. 31-40 ◽  
Author(s):  
CÉDRIC SIMENEL ◽  
BENOÎT AVEZ
Keyword(s):  
Excitation Function ◽  
Heavy Ions ◽  
Mean Field ◽  
Time Dependent ◽  
Skyrme Interaction ◽  
Hartree Fock ◽  
The Mean ◽  
Good Agreement

A microscopic mean-field description of heavy ions fusion is performed in the framework of the Time-Dependent Hartree-Fock (TDHF) theory using a Skyrme interaction with the SLy 4d parametrization. A good agreement with experiments is obtained on the position of the fusion barriers for various total masses, mass asymmetries and deformations. The excitation function of the 16 O +208 Pb is overestimated by about 16% above the barrier. The restriction to an independent particles state in the mean-field dynamics prevents the description of sub-barrier fusion. Effect of transfer on fusion is discussed.

The Range Distribution of Yb Ions Implanted in 6H Silicon Carbide

2014 ◽  
Vol 599-601 ◽  
pp. 160-163
Author(s):  
Xi Feng Qin ◽  
Gui Jie Ma ◽  
Shu Hua Shi ◽  
Feng Xiang Wang
Keyword(s):  
Silicon Carbide ◽  
Monte Carlo ◽  
Spectrum Analysis ◽  
Monte Carlo Code ◽  
Experiment Data ◽  
Range Distribution ◽  
Projected Range ◽  
The Mean ◽  
The Difference ◽  
Good Agreement

The mean projected ranges and range straggling for energetic 200 – 500 keV Yb ions implanted in 6H-SiC were measured by means of Rutherford backscattering followed by spectrum analysis. The measured values are compared with Monte Carlo code (SRIM2012) calculations. It has been found that the measured values of the mean projected range are good agreement with the SRIM calculated values; for the range straggling , the difference between the experiment data and the calculated results is much higher than that of .

The Range Distribution of Nd Ions Implanted in Silicon-on-Insulator

2011 ◽  
Vol 306-307 ◽  
pp. 315-318
Author(s):  
Yi Liang ◽  
Hong Zhen Li ◽  
Shuang Li ◽  
Feng Xiang Wang ◽  
Xi Feng Qin
Keyword(s):  
Monte Carlo ◽  
Room Temperature ◽  
Silicon On Insulator ◽  
Monte Carlo Code ◽  
Experiment Data ◽  
Lateral Deviation ◽  
Projected Range ◽  
The Mean ◽  
The Difference ◽  
Good Agreement

In view of the influence of the projected range, the range straggling, and the lateral deviation of ions in materials on the property of photoelectric integration devices fabricated by ion implantation, the mean projected ranges and range straggling for energetic 200 – 500 keV neodymium (Nd) ions implanted in silicon-on-insulator (SOI) at room temperature were measured by means of Rutherford backscattering followed by spectrum analysis.The measured results are compared with Monte Carlo code (SRIM2006) predictions. Our results show that the measured values of the mean projected rangeRpare good agreement with the SRIM calculated values; for the range straggling ΔRp, the difference between the experiment data and the calculated results is much higher than that ofRp.

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