Microscopic description of the backward rise of the elastic angular distribution of16O+28Si

1984 ◽  
Vol 81 (1) ◽  
pp. 278-290 ◽  
Author(s):  
G. Pollarolo ◽  
R. A. Broglia
Keyword(s):  
Angular Distribution ◽  
Microscopic Description ◽  
Elastic Angular Distribution

SECOND-ORDER EIKONAL MODEL ANALYSIS OF16O+16OELASTIC SCATTERING

2001 ◽  
Vol 10 (04n05) ◽  
pp. 373-386 ◽  
Author(s):  
YONG JOO KIM ◽  
MOON HOE CHA
Keyword(s):  
Angular Distribution ◽  
Elastic Scattering ◽  
Scattering Amplitudes ◽  
Optical Potential ◽  
Second Order ◽  
Angular Distributions ◽  
Eikonal Model ◽  
Oscillatory Structure ◽  
Nuclear Rainbow ◽  
Elastic Angular Distribution

We analyze the elastic scattering angular distributions of the16O +16O system at Elab=480 MeV and 704 MeV within the framework of the second-order eikonal model based on Coulomb trajectories of colliding nuclei. The diffractive oscillatory structure observed in the elastic angular distribution could be explained due to the interference between the near- and far-side scattering amplitudes. The presence of a nuclear rainbow in this system is evidenced through a classical deflection function. The effective optical potential is developed from the second-order non-eikonal phase shifts.

scholarly journals New 23Na evaluation in the resolved resonance range taking into account both differential and double differential experiments

2020 ◽  
Vol 239 ◽  
pp. 11006
Author(s):  
Pierre Tamagno ◽  
Pascal Archier ◽  
Cyrille De Saint Jean ◽  
Gilles Noguère
Keyword(s):  
Angular Distribution ◽  
Cross Sections ◽  
Evaluation Process ◽  
Nuclear Data ◽  
Angular Distributions ◽  
Quantum Numbers ◽  
Nuclear Data Library ◽  
Critical Facilities ◽  
Elastic Angular Distribution ◽  
Level Of Agreement

In 2012 CEA produced a entire new evaluation of sodium nuclear data for the release of the JEFF-3.2 evaluated nuclear data library. During the evaluation process performed with the CONRAD code, several differential measurements (total and discrete inelastic cross-sections) have been used. However double differential data (elastic angular distribution) that were yet available in the EXFOR database were not incorporated in the analysis at that time. The experimental elastic angular distribution were discarded because of it was impossible to obtain a good agreement for both angle-integrated cross-sections and double differential ones. The underlying cause of this disagreement is expected to be due to the attribution of quantum numbers to resonance and related channel amplitudes. Indeed these numbers are imposed during the analysis but impact differently angular distributions and angle-integrated cross-sections. An automated search for an accurate set of quantum numbers has been implemented in order to produce a reliable quantum numbers set. In this paper we present a new evaluation of Na-23 taking into account both differential and double differential measurements. The analysis performed with the CONRAD code reached the level of agreement with experimental data for the total and inelastic cross-sections but this time with a significant improvement for the elastic angular distributions. This new evaluation produced in the ENDF-6 format has then been tested and validated on critical facilities calculation (MASURCA and ZPPR) in different configurations (nominal and voided) in order to assess its performances.

Volume and surface nonlocality terms in the neutron–nucleus elastic scattering using the velocity-dependent optical potential

2019 ◽  
Vol 97 (4) ◽  
pp. 421-430
Author(s):  
M.F. Hasan
Keyword(s):  
Experimental Data ◽  
Angular Distribution ◽  
Incident Energy ◽  
Optical Potential ◽  
Large Angle ◽  
Second Step ◽  
Surface Term ◽  
Elastic Neutron ◽  
Elastic Neutron Scattering ◽  
Elastic Angular Distribution

In this work, we tested the effect of adding a volume term to the surface term in our modified optical potential in the case of elastic neutron scattering of spin-zero 40Ca nucleus in the incident energy range between 30–50 MeV. This is achieved in two steps. First, we fit our theoretical elastic angular distribution scattering using the surface term in our velocity-dependent optical potential concerning the experimental data. Then, we adjust our theoretical elastic angular distribution scattering with the experimental data after adding the volume term into our velocity-dependent optical potential. The second step is comparing the two fits and noticing the effect of adding a volume term to the surface term. Clearly, the modified optical potential using the volume term resulted in excellent fits to the experimental data, most notably the pronounced large angle, backscattering minima, which depend sensitively on the incident energies and which have long been associated with nonlocalities. We assume the nonlocality to be due to interaction between the incident neutrons and the nucleons inside the target.

16O-NUCLEUS ELASTIC SCATTERING IN THE ENERGY RANGE 300 MeV–1.503 GeV

2009 ◽  
Vol 18 (09) ◽  
pp. 1887-1902 ◽  
Author(s):  
DEEKSHA CHAUHAN ◽  
Z. A. KHAN
Keyword(s):  
Angular Distribution ◽  
Elastic Scattering ◽  
Energy Range ◽  
Form Factors ◽  
Body Density ◽  
Satisfactory Explanation ◽  
High Q ◽  
Elastic Angular Distribution ◽  
Basic Input ◽  
Nucleus Nucleus Collision

In this work we analyze the elastic angular distribution for the scattering of 16 O from 12 C , 16 O , 28 Si , 40 Ca , 90 Zr , and 208 Pb in the energy range 300 MeV–1.503 GeV within the framework of the Coulomb modified correlation expansion for the Glauber amplitude. Our calculations involve (i) up to the two-body density term in the correlation expansion, (ii) the realistic nuclear form factors, and (iii) the high q-components of the basic (input) NN amplitude. The results are found to provide a satisfactory explanation of the data in all the cases. Moreover, we could assess the energy dependence of the NN amplitude, and the trend of its slope strengthens the need of nondiffractive behavior of the NN amplitude in the energy range under consideration. We also show that the c.m. correlations play an important role in nucleus–nucleus collision.

Electron Scattering in Solids

1990 ◽  
Vol 48 (2) ◽  
pp. 4-5
Author(s):  
Ryuichi Shimizu ◽  
Ze-Jun Ding
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Angular Distribution ◽  
Elastic Scattering ◽  
Electron Scattering ◽  
Cross Sections ◽  
Expansion Method ◽  
Electron Excitation ◽  
Partial Wave Expansion ◽  
Backscattered Electrons

Monte Carlo simulation has been becoming most powerful tool to describe the electron scattering in solids, leading to more comprehensive understanding of the complicated mechanism of generation of various types of signals for microbeam analysis.The present paper proposes a practical model for the Monte Carlo simulation of scattering processes of a penetrating electron and the generation of the slow secondaries in solids. The model is based on the combined use of Gryzinski’s inner-shell electron excitation function and the dielectric function for taking into account the valence electron contribution in inelastic scattering processes, while the cross-sections derived by partial wave expansion method are used for describing elastic scattering processes. An improvement of the use of this elastic scattering cross-section can be seen in the success to describe the anisotropy of angular distribution of elastically backscattered electrons from Au in low energy region, shown in Fig.l. Fig.l(a) shows the elastic cross-sections of 600 eV electron for single Au-atom, clearly indicating that the angular distribution is no more smooth as expected from Rutherford scattering formula, but has the socalled lobes appearing at the large scattering angle.

Radiation of Charge Moving Between Two Planar Periodic Wire Structures

2020 ◽  
Vol 23 (1) ◽  
pp. 66-71
Author(s):  
E. A. Gurnevich ◽  
I. V. Moroz
Keyword(s):  
Angular Distribution ◽  
Charged Particle ◽  
Research And Development ◽  
High Power ◽  
Free Electron ◽  
Radiation Intensity ◽  
Free Electron Lasers ◽  
Radiation Sources ◽  
Power Radiation ◽  
High Power Radiation

The Smith-Purcell radiation of a charged particle moving in a periodic structure is analysed theoretically. The considered structure consists of two planar diffraction gratings with different periods which are formed by parallel conducting wires. The analytical expression for the spectral-angular distribution of radiation is obtained. It is shown that the angular distribution of radiation can be made narrower by using two gratings instead of one, and radiation intensity can be manipulated by parallel relative shift of gratings. The obtained results are of great importance for the research and development of high power radiation sources based on volume free-electron lasers.

Experimental investigation and modelling of light scattering in a-Si:H solar cells deposited on glass/ZnO:Al substrates

2002 ◽  
Vol 715 ◽  
Author(s):  
J. Krc ◽  
M. Zeman ◽  
O. Kluth ◽  
F. Smole ◽  
M. Topic
Keyword(s):  
Surface Roughness ◽  
Experimental Investigation ◽  
Solar Cells ◽  
Angular Distribution ◽  
Light Scattering ◽  
Optical Model ◽  
Distribution Functions ◽  
Interface Roughness ◽  
Scattering Parameters ◽  
Good Agreement

AbstractThe descriptive scattering parameters, haze and angular distribution functions of textured ZnO:Al transparent conductive oxides with different surface roughness are measured. An approach to determine the scattering parameters of all internal interfaces in p-i-n a-Si:H solar cells deposited on the glass/ZnO:Al substrates is presented. Using the determined scattering parameters as the input parameters of the optical model, a good agreement between the measured and simulated quantum efficiencies of the p-i-n a-Si:H solar cells with different interface roughness is achieved.

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