Optical Model Parameters for the Ar-36+α and Ca-40+α Systems

2005 ◽  
Author(s):  
L. Generalov
Keyword(s):  
Optical Model ◽  
Model Parameters

4He+Ni elastic scattering near the Coulomb barrier and optical model parameters

2002 ◽  
Vol 91 (4) ◽  
pp. 2438-2442 ◽  
Author(s):  
A. Nurmela ◽  
P. Pusa ◽  
E. Rauhala ◽  
J. Räisänen
Keyword(s):  
Elastic Scattering ◽  
Coulomb Barrier ◽  
Optical Model ◽  
Model Parameters

Study on the Relation of Ocean Atmospheric Aerosol Optical Model Parameters

2011 ◽  
Vol 31 (11) ◽  
pp. 1101005
Author(s):  
王家成 Wang Jiacheng ◽  
乔延利 Qiao Yanli ◽  
杨世植 Yang Shizhi ◽  
赵强 Zhao Qiang
Keyword(s):  
Atmospheric Aerosol ◽  
Optical Model ◽  
Model Parameters

scholarly journals Neutron inelastic cross section measurements on 54Fe

2020 ◽  
Vol 239 ◽  
pp. 01010
Author(s):  
Adina Olacel ◽  
Catalin Borcea ◽  
Marian Boromiza ◽  
Philippe Dessagne ◽  
Gregoire Henning ◽  
...  
Keyword(s):  
Cross Section ◽  
Optical Model ◽  
Inelastic Neutron Scattering ◽  
Inelastic Neutron ◽  
Analysis Procedure ◽  
Model Parameters ◽  
Electron Linear Accelerator ◽  
Section Measurement ◽  
Data Analysis Procedure ◽  
Experimental Values

A 54Fe(n, n'γ) cross section measurement was performed at the Geel Electron LINear Accelerator of EC-JRC, Geel using the Gamma Array for Inelastic Neutron Scattering spectrometer and a 235U fission chamber for flux normalization. The experimental results are presented in comparison with talys 1.9 default and tuned calculations. The tuned calculation, implying modifications of the optical model parameters, improved significantly the description of the experimental values and led to interesting conclusions regarding the interaction of the 54Fe nucleus with neutrons. Since the results of these calculations were already presented extensively in a dedicated paper, the present article focuses on details related to the experimental particularities and data analysis procedure.

Evaluation of Optical Model Potential Using Neutron Induced Cross Section Reaction for Spherical Uranium-238 Isotope up to 20MeV

2015 ◽  
Vol 59 ◽  
pp. 26-34
Author(s):  
Iman Tarik Al-Alawy ◽  
Ronak Ikram Ali
Keyword(s):  
Experimental Data ◽  
Energy Range ◽  
Cross Section ◽  
Cross Sections ◽  
Optical Model ◽  
Threshold Energy ◽  
Model Potential ◽  
Model Parameters ◽  
Incident Neutron ◽  
Optical Model Potential

The evaluation are based on mainly on the calculations of the nuclear optical model potential and relevant parameters are collected and selected from References Input Parameter Library (RIPL) which is being developed under the international project coordinated by the International Atomic Energy Agency (IAEA). The analyzing of a complete energy range has done starting from threshold energy for each reaction. The cross sections are reproduced in fine steps of incident neutron energy with 0.01MeV intervals with their corresponding errors. The recommended cross sections for available experimental data taken from EXFOR library have been calculated for all the considered neutron induced reactions for U-238 isotopes. The calculated results are analyzed and compared with the experimental data. The optimized optical potential model parameters give a very good agreement with the experimental data over the energy range 0.001-20MeV for neutron induced cross section reactions (n,f), (n,tot), (n,el), (n,inl), (n,2n), (n,3n), and (n,γ) for spherical U-238 target elements.

Investigation of optical model parameters for deuteron elastic scattering from 40Ar

1978 ◽  
Vol 307 (1) ◽  
pp. 91-105 ◽  
Author(s):  
H.R. Bürgi ◽  
W. Grüebler ◽  
P.A. Schmelzbach ◽  
V. König ◽  
R. Risler ◽  
...  
Keyword(s):  
Elastic Scattering ◽  
Optical Model ◽  
Model Parameters

scholarly journals The value of adding optics to ecosystem models: a case study

2007 ◽  
Vol 4 (3) ◽  
pp. 1585-1631 ◽  
Author(s):  
M. Fujii ◽  
E. Boss ◽  
F. Chai
Keyword(s):  
Optical Properties ◽  
Optical Model ◽  
Light Field ◽  
Ocean Color ◽  
Ecosystem Model ◽  
Model Parameters ◽  
Biogeochemical Processes ◽  
Ecosystem Models ◽  
Photo Oxidation ◽  
Subsurface Light

Abstract. Many ecosystem models have been developed to study the ocean's biogeochemistry, but most of these models use simple formulations to describe light penetration and spectral quality. Given that processes such as photosynthesis and photo-oxidation are uniquely important for biogeochemical processes in the upper ocean, it is necessary to model light distribution accurately. In addition, the global scale observations of proxies of biogeochemical variables are based on the color of the ocean. The ability to simulate the color of the ocean provides the possibility of comparing model simulation with these observations. Here, an optical model is coupled with a previously published ecosystem model that explicitly represents two phytoplankton (picoplankton and diatoms) and two zooplankton functional groups, as well as multiple nutrients and detritus. Surface ocean color field and subsurface light field are calculated by coupling the ecosystem model with an optical model that relates biogeochemical standing stocks with inherent optical properties (absorption, scattering); this provides input to a commercially available radiative transfer model (Ecolight). We apply this bio-optical model to the equatorial Pacific upwelling region, and find the model to be capable of reproducing many measured optical properties and key biogeochemical processes in this region. Results include large contributions by non-algal particles to the total scattering or attenuation (>50% at 660 nm) and their small contribution to particulate absorption (<20% at 440 nm), and a remarkable contribution by picoplankton to total phytoplankton absorption (>95% at 440 nm). These results are consistent with the field observations. In order to achieve such good agreement between data and model results, however, key model parameters, for which no field data is available, have to be constrained. Sensitivity analysis of the model results to optical parameters reveals the significant role of colored dissolved organic matter to the modeled properties. Coupling explicit optics to an ecosystem model provides several advantages in generating: (1) a more accurate subsurface light-field, which is important for light sensitive biogeochemical processes such as photosynthesis and photo-oxidation, (2) added constraints on model parameters that help to reduce uncertainties in ecosystem model simulations, and (3) model output which is comparable to basic remotely-sensed properties. In addition, the coupling of biogeochemical models and optics paves the road for future assimilation of ocean color and in-situ measured optical properties into the models.

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