Investigations on the Impact of Heavy Nuclides Resonance Elastic Scattering Models on Resonance Integrals

2010 ◽  
Author(s):  
Sitao Peng ◽  
Shaohong Zhang ◽  
Xiaofeng Jiang
Keyword(s):  
Elastic Scattering ◽  
Cross Section ◽  
Incident Energy ◽  
Cross Section Data ◽  
Section Data ◽  
Slowing Down ◽  
The Monte Carlo Method ◽  
Resonance Cross Section ◽  
Scattering Kernel ◽  
The Impact

In today’s cross section data processing process, asymptotic scattering model is employed by NJOY for the neutron/nucleus elastic scattering interactions in the epithermal energy region, which means that the energy of a scattered neutron is always lower than its incident energy and it falls evenly within the interval of [αE, E]. This model has recently been proved to have non-ignorable errors at some resonances of heavy nuclides. In this study, to investigate the impact of heavy nuclides resonance elastic scattering models to the resonance integrals, exact scattering kernel is employed and a deterministic code Estuary is developed to efficiently solve the neutron slowing down problem. Numerical results demonstrate that with the use of Estuary, results given in the literature obtained by the Monte Carlo method can be reproduced. With the resonance cross section approximately represented by the single-level Breit-Wigner formulation, investigations are made for different resonance parameters for both asymptotic and exact scattering models. Relations between errors and these related parameters are summarized.

DIFFERENTIAL OPERATORS FOR SCATTERING AMPLITUDES

2007 ◽  
Vol 16 (09) ◽  
pp. 2910-2914
Author(s):  
MÁRCIO JOSÉ MENON ◽  
REGINA FONSECA ÁVILA
Keyword(s):  
Elastic Scattering ◽  
Scattering Amplitudes ◽  
Cross Section ◽  
Differential Form ◽  
Differential Operators ◽  
Dispersion Relations ◽  
Proton Scattering ◽  
Cross Section Data ◽  
Proton Proton ◽  
Section Data

We discuss novel dispersion relations in differential form, connecting real and imaginary parts of elastic scattering amplitudes and formally valid at any energy above the physical threshold. By means of fits to total cross section data from proton-proton and antiproton-proton scattering, we evaluate the corresponding ratio ρ between the real and imaginary parts of the forward amplitudes. We show that the results are exactly the same as those obtained through standard integral dispersion relations.

MICROSCOPIC POTENTIAL DESCRIPTION OF THE ELASTIC SCATTERING AND FUSION CROSS-SECTION DATA OF THE 12C+24Mg SYSTEM

2006 ◽  
Vol 15 (06) ◽  
pp. 1317-1332 ◽  
Author(s):  
M. KARAKOC ◽  
I. BOZTOSUN
Keyword(s):  
Elastic Scattering ◽  
Cross Section ◽  
Fusion Cross Section ◽  
Nucleon Nucleon ◽  
Angular Distributions ◽  
Cross Section Data ◽  
Section Data ◽  
Coupled Channels ◽  
Double Folding ◽  
Detailed Application

This paper comprises the first detailed application of the microscopic potentials for a simultaneous analysis of the elastic scattering and fusion cross-section data of the 12 C+ 24Mg system from 16.0 MeV to 24.0 MeV. We use the microscopic nucleon-nucleon double folding and α-α double folding cluster potentials within the framework of the optical model and coupled-channels formalism. We compare our microscopic potential results with the findings of the phenomenological deep and shallow potentials. All potentials provide a very good agreement with the experimental data for the elastic scattering angular distributions. However, only deep phenomenological, the microscopic nucleon-nucleon and α-α double folding cluster potentials provide a consistent description of the angular distributions and fusion cross-section data simultaneously.

Evaluation of Neutron Resonance Cross Section Data at GELINA

2014 ◽  
Vol 119 ◽  
pp. 94-97 ◽  
Author(s):  
P. Schillebeeckx ◽  
B. Becker ◽  
R. Capote ◽  
F. Emiliani ◽  
K. Guber ◽  
...  
Keyword(s):  
Cross Section ◽  
Neutron Resonance ◽  
Cross Section Data ◽  
Section Data ◽  
Resonance Cross Section

Resolution of discrepancy between backward angle cross-section data for neutron-deuteron elastic scattering

1994 ◽  
Vol 16 (3) ◽  
pp. 127-142 ◽  
Author(s):  
C. R. Howell ◽  
W. Tornow ◽  
H. R. Setze ◽  
R. T. Braun ◽  
D. E. Gonzalez Trotter ◽  
...  
Keyword(s):  
Elastic Scattering ◽  
Cross Section ◽  
Cross Section Data ◽  
Section Data ◽  
Backward Angle

The Effectiveness of Fixed Assets in the Economy of the Regions of Modern Russia

2019 ◽  
Vol 7 (3) ◽  
pp. 36-39
Author(s):  
Леонид Басовский ◽  
Leonid Basovskiy ◽  
Елена Басовская ◽  
Elena Basovskaya
Keyword(s):  
Labor Productivity ◽  
Cross Section ◽  
Fixed Capital ◽  
General Tendency ◽  
Cross Section Data ◽  
Section Data ◽  
Labor Ratio ◽  
Capital Labor Ratio ◽  
The Impact ◽  
Regions Of Russia

The aim of the work was to study the dynamics of the influence of the main capital on labor productivity in the economy of modern Russia. To identify the effect of capital-labor ratio on labor productivity production function models were used. To obtain the models, Rosstat cross-section data were used for 80 regions of Russia for the period 2010–2017 except for the autonomous districts that are part of individual regions). In addition, for the period 2014–2017 cross section data were used for 82 regions of Russia, including the Republic of Crimea and the city of Sevastopol. The results of the simulation allowed us to determine that the capital productivity of labor in 2010–2017 explained from 75% to 81% of labor productivity in the regions of the country. In the period under review, there is a general tendency to reduce the impact of the capital-labor ratio, reflecting a decrease in the efficiency of using fixed capital in the country. The decline in the efficiency of using fixed capital in the economy may be a consequence of the formation of an institutional environment unfavorable to the economic development.

scholarly journals Impact of using a new ultraviolet ozone absorption cross-section dataset on OMI ozone profile retrievals

2020 ◽  
Vol 13 (11) ◽  
pp. 5845-5854
Author(s):  
Juseon Bak ◽  
Xiong Liu ◽  
Manfred Birk ◽  
Georg Wagner ◽  
Iouli E. Gordon ◽  
...  
Keyword(s):  
Cross Section ◽  
Cross Sections ◽  
Absorption Cross Section ◽  
High Latitudes ◽  
Absorption Cross ◽  
Cross Section Data ◽  
Ozone Absorption ◽  
Section Data ◽  
Ozone Profile ◽  
The Impact

Abstract. We evaluate different sets of high-resolution ozone absorption cross-section data for use in atmospheric ozone profile measurements in the Hartley and Huggins bands with a particular focus on BDM 1995 (Daumont et al. 1992; Brion et al., 1993; Malicet et al., 1995), currently used in our retrievals, and a new laboratory dataset by Birk and Wagner (2018) (BW). The BDM cross-section data have been recommended to use for retrieval of ozone profiles using spaceborne nadir-viewing backscattered ultraviolet (BUV) measurements since its improved performance was demonstrated against other cross-sections including Bass and Paur (1985) (BP) and those of Serdyuchenko et al. (2014) and Gorshelev et al. (2014) (SER) by the “Absorption Cross-Sections of Ozone” (ACSO) activity. The BW laboratory data were recently measured within the framework of the European Space Agency (ESA) project SEOM-IAS (Scientific Exploitation of Operational Missions – Improved Atmospheric Spectroscopy Databases) to provide an advanced absorption cross-section database. The BW cross-sections are made from measurements at more temperatures and in a wider temperature range than BDM, especially for low temperatures. Relative differences of cross-sections between BW and BDM range from ∼2 % at shorter UV wavelengths to ∼5 % at longer UV wavelengths at warm temperatures. Furthermore, these differences dynamically increase by up to ±40 % at cold temperatures due to no BDM measurements having been made below 218 K. We evaluate the impact of using different cross-sections on ozone profile retrievals from Ozone Monitoring Instrument (OMI) measurements. Correspondingly, this impact leads to significant differences in individual ozone retrievals by up to 50 % in the tropopause where the coldest atmospheric temperatures are observed. Bottom atmospheric layers illustrate the significant change of the retrieved ozone values, with differences of 20 % in low latitudes, which is not the case in high latitudes because the ozone retrievals are mainly controlled by a priori ozone information in high latitudes due to less photon penetration down to the lower troposphere. Validation with ozonesonde observations demonstrates that BW and BDM retrievals show altitude-dependent bias oscillations of similar magnitude relative to ozonesonde measurements, much smaller than those of both BP and SER retrievals. However, compared to BDM, BW retrievals show significant reduction in standard deviation, by up to 15 %, especially at the coldest atmospheric temperatures. Such improvement is achieved mainly by the better characterization of the temperature dependence of ozone absorption.

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