Microscopic optical model calculations of - nucleus absorption cross sections

1996 ◽  
Vol 22 (3) ◽  
pp. 387-396 ◽  
Author(s):  
R R Dubey ◽  
G S Khandelwal ◽  
F A Cucinotta ◽  
J W Wilson
Keyword(s):  
Cross Sections ◽  
Optical Model ◽  
Absorption Cross ◽  
Model Calculations

Systematic nonlocal optical model potential for nucleons

2015 ◽  
Vol 24 (01) ◽  
pp. 1550006 ◽  
Author(s):  
Yuan Tian ◽  
Dan-Yang Pang ◽  
Zhong-Yu Ma
Keyword(s):  
Cross Sections ◽  
Optical Model ◽  
Model Potential ◽  
Nucl Phys ◽  
Angular Distributions ◽  
Model Calculations ◽  
Analyzing Powers ◽  
Optical Model Potential ◽  
Fitting Procedures ◽  
Scattering Cross Sections

Based on the Perey–Buck nonlocal optical model potential, F. Perey and B. Buck, Nucl. Phys. 32 (1962) 353, we obtain a new set of nonlocal optical model potential (NLOMP) parameters for proton and neutron scattering off nuclei. The experimental angular distributions of nucleon scattering off nuclei ranging from 27 Al to 208 Pb with incident energies around 10 MeV to 30 MeV are adopted in the fitting procedures. This NLOMP is energy independent. The chi-squares χ2 obtained in the fittings are comparable to those from the KD03 phenomenological local optical model potentials (OMP) A. Koning and J. Delaroche, Nucl. Phys. A 713 (2003) 231. Good agreement is found in comparisons between optical model calculations using this NLOMP and KD03 in their reproduction to the experimental angular distributions of elastic scattering cross-sections and analyzing powers.

The interaction of 970 MeV protons with helium

1960 ◽  
Vol 257 (1290) ◽  
pp. 316-325 ◽  
Keyword(s):  
Cross Sections ◽  
Optical Model ◽  
Meson Production ◽  
Absorption Cross ◽  
Proton Proton ◽  
Particle Characteristics ◽  
Pressure Diffusion ◽  
Elastic Proton ◽  
Charged Meson ◽  
Mev Protons

The interaction of 970 MeV protons with helium has been studied with a high-pressure diffusion cloud chamber. From 642 events the total and absorption cross-sections were found to be 116 ± 17 mb and 93 ± 13 mb, respectively. These agree with values obtained by extrapolation of known cross-sections for more complex nuclei, and the results are interpreted in terms of the optical model of the nucleus. The angular distribution for elastic-scattering yields an α -particle radius of 1⋅8 x 10 -13 cm. Quasi-elastic proton-proton and proton-neutron scattering, and more particularly charged meson production, show that the α -particle has some individual particle characteristics. Meson reabsorption appears unimportant.

scholarly journals Thermonuclear Reaction Rates for Reactions Leading to N = 28 Nuclei

1995 ◽  
Vol 48 (1) ◽  
pp. 125
Author(s):  
A.J Morton ◽  
DG Sargood
Keyword(s):  
Statistical Model ◽  
Nuclear Reaction ◽  
Cross Sections ◽  
Optical Model ◽  
Reaction Rates ◽  
Reaction Cross ◽  
Model Parameters ◽  
Thermonuclear Reaction ◽  
Model Calculations ◽  
Reaction Cross Sections

Nuclear reaction cross sections derived from statistical-model calculations have been used in the calculation of thermonuclear reaction rates for 36 nuclei at temperatures that are representative of the interiors of evolving stars and supernovae as nucleosynthesis approaches the production of nuclei with N = 28. The statistical-model calculations used optical-model parameters in the particle channels which had been selected to give the best overall agreement between theoretical and experimental cross sections for reactions on stable target nuclei in the mass and energy ranges of importance for the stellar conditions of interest. The optical-model parameters used, and the stellar reaction rates obtained, are tabulated. Comparisons are made between these stellar rates and those from other statistical-model calculations in the literature.

Neutron Total Cross Sections Between 20 and 45 MeV

1974 ◽  
Vol 52 (7) ◽  
pp. 648-654 ◽  
Author(s):  
I. F. Bubb ◽  
S. N. Bunker ◽  
M. Jain ◽  
J. W. Leonard ◽  
A. McIlwain ◽  
...  
Keyword(s):  
Energy Range ◽  
Energy Dependence ◽  
Cross Sections ◽  
Optical Model ◽  
Surface Absorption ◽  
Model Calculations ◽  
Total Cross Sections ◽  
Cu And Zn

Neutron total cross sections have been measured in the energy range of 20 to 45 MeV for Be, C, Al, Cu, and Zn. The typical accuracy was 1% to 2%. Results are compared with optical model calculations in which the only variable is the surface absorption strength, which is constrained to vary with a linear energy dependence. The calculation is extended to include 13 nuclei with A < 75.

UV/Vis Absorption, Emission Spectra and Two-Photo Absorption Cross Sections of 4-Dihydroquinolinone Derivatives

2011 ◽  
Vol 233-235 ◽  
pp. 2748-2754
Author(s):  
Qi Qi ◽  
Yong Quan Ha ◽  
Hai Qing Xu ◽  
Yue Ming Sun
Keyword(s):  
Density Functional Theory ◽  
Absorption Spectra ◽  
Cross Sections ◽  
Density Functional ◽  
Emission Spectra ◽  
Photon Absorption ◽  
Absorption Cross ◽  
Functional Theory ◽  
Model Calculations ◽  
Absorption And Emission

A series of 4-dihydroquinolinone derivatives were fully optimized by density functional theory (DFT), Hartree-Fock (HF) and Configuration Interaction Singlet (CIS) approaches. Absorption spectra, emission spectra and two-photon absorption cross sections were calculated by using time-dependent density functional theory and few-state model. Calculations were performed in the presence of solvent by using Conductor polarizable continuum model (CPCM). The molecular geometries, absorption spectra, emission spectra were in good agreement well with those experiment values. The absorption and emission peak red-shifted as a result of the extension of the conjugated structures. The introduction of heteroatoms such as F, Cl and Br gave rise to intramolecular transfer and the blueshift of the absorption and the emission spectra. The introduction of O or S atoms in two sides of molecules propelled the redshift of the absorption and emission maximum.

scholarly journals Covariance matrices for cross sections issued from optical model calculations

2007 ◽  
Author(s):  
P. Dossantos-Uzarralde ◽  
P. Mounier ◽  
M. Brassart ◽  
M. Couvert
Keyword(s):  
Cross Sections ◽  
Optical Model ◽  
Covariance Matrices ◽  
Model Calculations

Cross Section Measurements for the Reactions 53Cr(p,g)54Mn, 53Cr(p,n)53Mn and 53Cr(p, p')53Cr

1981 ◽  
Vol 34 (1) ◽  
pp. 25 ◽  
Author(s):  
HJ Gardner ◽  
LW Mitchell ◽  
SR Kennett ◽  
MR Anderson ◽  
DG Sargood
Keyword(s):  
Statistical Model ◽  
Cross Section ◽  
Cross Sections ◽  
Proton Energy ◽  
Optical Model ◽  
Model Parameters ◽  
Model Calculations ◽  
Isobaric Analogue ◽  
Theory And Experiment

Cross sections have been measured for the reactions 53Cr(p, y)5 4Mn, 53Cr(p, n)53Mn and 53Cr(p, p/)53Cr over the proton energy range O'88-2'40 MeV. The results are compared with the predictions of statistical model, calculations with global optical model parameters, with particular reference to the role of isobaric analogue resonances. Satisfactory agreement between theory and experiment is achieved for all three reactions.

scholarly journals Sensitivity analysis of neutron total and absorption cross sections within the optical model

2011 ◽  
Vol 83 (2) ◽  
Author(s):  
M. T. Pigni ◽  
M. Herman ◽  
P. Obložinský ◽  
F. S. Dietrich
Keyword(s):  
Sensitivity Analysis ◽  
Cross Sections ◽  
Optical Model ◽  
Absorption Cross
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