Three-body annihilations of and the quark rearrangement model

1977 ◽  
Vol 55 (23) ◽  
pp. 2059-2065 ◽  
Author(s):  
Robert K. Logan ◽  
Stephan Kogitz ◽  
Seiichi Tanaka
Keyword(s):  
Experimental Data ◽  
Cross Section ◽  
Final States ◽  
Three Body ◽  
Annihilation Reactions

Aphenomenological study of the quark rearrangement model is made using the results of cross section measurements of a number of [Formula: see text] annihilation reactions. The experimental data is shown to be consistent with the quark rearrangement model and Zweig's rule, if we restricted ourselves in the three-meson final states.

scholarly journals Schalenmodell-Approximation für drei Körper im Ausgangskanal / Shell-Model Approach for Three Body Final States

1973 ◽  
Vol 28 (2) ◽  
pp. 185-205
Author(s):  
A. Grauel
Keyword(s):  
Energy Distribution ◽  
Shell Model ◽  
Cross Section ◽  
Scattering Theory ◽  
Wave Functions ◽  
Final States ◽  
S Matrix ◽  
Coulomb Effects ◽  
Three Body ◽  
Model Approach

A scattering theory for reactions with three-particle channels above the two-particle threshold is developed. The S-matrix-technique is used for the calculation of the extended S-matrix. Correlated two-particle wave functions in the exit channels are employed to describe the exact two-particle continuum. For the usual shell model only a few partial waves dominate. The cross section depends on the energy-distribution between the two outgoing nucleons. Numerical results are presented for the model (d, 2n)-reaction exciting 0+ -states in O16 without Coulomb-effects. The treatment is restricted to three (2p2h)-states with the particles in the (sd)-shell and holes in the p-shell.

scholarly journals The equation of motion phonon method and its application in the neutron rich oxygen region

2018 ◽  
Vol 194 ◽  
pp. 01003
Author(s):  
G. De Gregorio ◽  
F. Knapp ◽  
N. Lo Iudice ◽  
P. Veselý
Keyword(s):  
Experimental Data ◽  
Strong Coupling ◽  
Satisfactory Agreement ◽  
Cross Section ◽  
Level Density ◽  
Equation Of Motion ◽  
Low Energy ◽  
Nuclear Systems ◽  
Three Body ◽  
Chiral Potential

An equation of motion phonon method, developed for even-even nuclear systems and extended to odd nuclei, is applied to 22O and to its odd neighbors 23O and 23F. A calculation using the chiral potential NNLOopt is carried out in a space encompassing up to two phonons. The computed dipole cross section in 22O and the spectra of 22O and 23O are in a satisfactory agreement with the experimental data. However, the calculation describes poorly the spectrum of 23F. This discrepancy originates from the strong coupling between the odd proton and the 22O phonons of neutron nature. This coupling pushes down in energy several states enhancing the level density at low energy. We suggest that a viable route for the solution of this problem could be the inclusion of the three-body interaction using the new chiral potential NNLOsat.

Evidence for three-body forces in p–d breakup at 25 MeV?

1990 ◽  
Vol 68 (10) ◽  
pp. 1200-1202
Author(s):  
W. B. Wango ◽  
J. Birchall ◽  
J. S. C. McKee ◽  
J. P. Svenne
Keyword(s):  
Experimental Data ◽  
Cross Section ◽  
Breakup Cross Section ◽  
Deuteron Breakup ◽  
Body Forces ◽  
Paris Potential ◽  
Three Body

Experimental data for deuteron breakup by protons in collinear geometry at 25.00 MeV are compared with the predictions of rigorous Faddeev calculations using the Paris potential and with those of the Doleschall code. The Paris potential significantly underdetermines the breakup cross section in collinear geometry. The explanation for this discrepancy is not entirely clear at this time.

K+ PRODUCTION FROM pn, pp AND pd INTERACTIONS AT ANKE/COSY

2007 ◽  
Vol 22 (02n03) ◽  
pp. 514-517
Author(s):  
◽  
YURY VALDAU
Keyword(s):  
Experimental Data ◽  
Phase Space ◽  
Total Cross Section ◽  
Cross Section ◽  
Final State ◽  
Constant Matrix ◽  
Order Of Magnitude ◽  
Simple Phase ◽  
Three Body ◽  
Exclusive Measurement

In order to understand experimental data for K+ production in proton-deuteron interactions and draw conclusions about the ratio between K+ production in pn and pp, one needs to develop an approach for the description of all relevant pp results. We perform an analysis of the pp data available in COSY energy range for three reaction channels. It can be concluded that Λ and Σ0 production channels can be well described by the three-body phase space incorporating the hyperon-nucleon final-state interactions under the assumption of a constant matrix element. Experimental data on the pp → K+ nΣ+ reaction channel are very poor and more information is needed to understand a strange behavior of the energy dependence of the total cross section. Using ANKE inclusive K+ data at 2.85 and 2.95 GeV/c, preliminary values for the total cross-section of Σ+ production in pp interactions has been extracted applying a simple phase space approach. This gives a result roughly one order of magnitude less than that of the recently published exclusive measurement.

Fusion and Breakup Reactions of 17S + 208Pb and 15C + 232ThHalo Nuclei Systems

2015 ◽  
Vol 11 (2) ◽  
pp. 2972-2978
Author(s):  
Fouad A. Majeed ◽  
Yousif A. Abdul-Hussien
Keyword(s):  
Experimental Data ◽  
Cross Section ◽  
Fusion Reaction ◽  
Fusion Cross Section ◽  
Reaction Cross ◽  
Recent Experimental Data ◽  
Barrier Distribution ◽  
Coupled Channel ◽  
Total Fusion ◽  
Full Quantum

In this study the calculations of the total fusion reaction cross section have been performed for fusion reaction systems 17F + 208Pb and 15C + 232Th which involving halo nuclei by using a semiclassical approach.The semiclassical treatment is comprising the WKB approximation to describe the relative motion between target and projectile nuclei, and Continuum Discretized Coupled Channel (CDCC) method to describe the intrinsic motion for both target and projectile nuclei. For the same of comparsion a full quantum mechanical clacualtions have been preforemd using the (CCFULL) code. Our theorticalrestuls are compared with the full quantum mechaincialcalcuations and with the recent experimental data for the total fusion reaction  checking the stability of the distancesThe coupled channel calculations of the total fusion cross section σfus, and the fusion barrier distribution Dfus. The comparsion with experiment proves that the semiclassiacl approach adopted in the present work reproduce the experimental data better that the full quantal mechanical calcautions. 

SETTING A DIAGRAM APPROACH TO CALCULATING VIBRATED, CENTRIFUGED AND VIBROCENTRIFUGED REINFORCED CONCRETE COLUMNS WITH A VARIATROPIC STRUCTURE

2020 ◽  
pp. 22-34
Author(s):  
Л. Р. Маилян ◽  
С. А. Стельмах ◽  
Е. М. Щербань ◽  
М. П. Нажуев
Keyword(s):  
Experimental Data ◽  
Reinforced Concrete ◽  
Bearing Capacity ◽  
Cross Section ◽  
Concrete Columns ◽  
Reinforced Concrete Columns ◽  
The Cross ◽  
Concrete Elements ◽  
Diagram Approach

Состояние проблемы. Железобетонные элементы изготавливаются, как правило, по трем основным технологиям - вибрированием, центрифугированием и виброцентрифугированием. Однако все основные расчетные зависимости для определения их несущей способности выведены, исходя из основного постулата - постоянства и равенства характеристик бетона по сечению, что реализуется лишь в вибрированных колоннах. Результаты. В рамках диаграммного подхода предложены итерационный, приближенный и упрощенный способы расчета несущей способности железобетонных вибрированных, центрифугированных и виброцентрифугированных колонн. Выводы. Расчет по диаграммному подходу показал существенно более подходящую сходимость с опытными данными, чем расчет по методике норм, а также дал лучшие результаты при использовании дифференциальных характеристик бетона, чем при использовании интегральных и, тем более, нормативных характеристик бетона. Statement of the problem. Reinforced concrete elements are typically manufactured according to three basic technologies - vibration, centrifugation and vibrocentrifugation. However, all the basic calculated dependencies for determining their bearing capacity were derived using the main postulate, i.e., the constancy and equality of the characteristics of concrete over the cross section, which is implemented only in vibrated columns. Results. Within the framework of the diagrammatic approach, iterative, approximate and simplified methods of calculating the bearing capacity of reinforced concrete vibrated, centrifuged and vibrocentrifuged columns are proposed. Conclusions. The calculation according to the diagrammatic approach showed a significantly better convergence with the experimental data than that using the method of norms, and also performs better when using differential characteristics of concrete than when employing integral and particularly standard characteristics of concrete.

An investigation of effects of level density models and gamma ray strength functions on cross-section calculations for the production of 90Y, 153Sm, 169Er, 177Lu and 186Re therapeutic radioisotopes via (n,γ) reactions

2019 ◽  
Vol 108 (1) ◽  
pp. 11-17
Author(s):  
Mert Şekerci ◽  
Hasan Özdoğan ◽  
Abdullah Kaplan
Keyword(s):  
Experimental Data ◽  
Cross Section ◽  
Production Cross Section ◽  
Gamma Ray ◽  
Production Cross ◽  
Level Density ◽  
Experimental Studies ◽  
Level Density Models ◽  
Strength Functions ◽  
Cancer Diseases

Abstract One of the methods used to treat different cancer diseases is the employment of therapeutic radioisotopes. Therefore, many clinical, theoretical and experimental studies are being carried out on those radioisotopes. In this study, the effects of level density models and gamma ray strength functions on the theoretical production cross-section calculations for the therapeutic radioisotopes 90Y, 153Sm, 169Er, 177Lu and 186Re in the (n,γ) route have been investigated. TALYS 1.9 code has been used by employing different level density models and gamma ray strength functions. The theoretically obtained data were compared with the experimental data taken from the literature. The results are presented graphically for better interpretation.

Rearrangement collisions: two-particle exchange

1964 ◽  
Vol 277 (1369) ◽  
pp. 206-213 ◽  
Keyword(s):  
Energy Dependence ◽  
Cross Section ◽  
Born Approximation ◽  
High Energy ◽  
Electron Exchange ◽  
Final States ◽  
Particle Exchange ◽  
Exchange Cross Section

It is shown that the first Bom approximation for the exchange of two uncorrelated electrons should vanish. A formalism for the T matrix is presented which has this property. The high-energy result for the two-electron exchange cross-section previously calculated in first Born approximation behaves like E -7 . This result is in error due to a lack of orthogonality of initial and final states. When this is corrected the result for uncorrelated electrons has an energy dependence E -11 . The introduction of correlation gives terms behaving like E -10 which cannot be calculated unam biguously.

Three-body dissociation dynamics 1. Dissociative electron attachment differential cross section of Br− in HgBr2 and Cl− in HgCl2

1985 ◽  
Vol 95 (2) ◽  
pp. 179-187 ◽  
Author(s):  
M. Tronc ◽  
J.P. Ziesel ◽  
R. Azria ◽  
M. Sizun ◽  
S. Goursaud
Keyword(s):  
Differential Cross Section ◽  
Cross Section ◽  
Differential Cross ◽  
Electron Attachment ◽  
Dissociative Electron Attachment ◽  
Dissociation Dynamics ◽  
Three Body
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