The role of electromagnetic form factors in meson exchange currents

1988 ◽  
Vol 331 (4) ◽  
pp. 509-518 ◽  
Author(s):  
S. K. Singh ◽  
W. Leidemann ◽  
H. Arenh�vel
Keyword(s):  
Form Factors ◽  
Meson Exchange ◽  
Electromagnetic Form Factors ◽  
Meson Exchange Currents

IsovectorM1 transitions inSi28and the role of meson exchange currents

1996 ◽  
Vol 53 (1) ◽  
pp. 127-130 ◽  
Author(s):  
C. Lüttge ◽  
P. von Neumann-Cosel ◽  
F. Neumeyer ◽  
C. Rangacharyulu ◽  
A. Richter ◽  
...  
Keyword(s):  
Meson Exchange ◽  
Meson Exchange Currents

Magnetic form factors for a trinucleon system using different meson exchange nucleon–nucleon interactions

1993 ◽  
Vol 71 (9-10) ◽  
pp. 455-461
Author(s):  
Ahmed Osman ◽  
M. Zaky ◽  
M. A. Allam
Keyword(s):  
Experimental Data ◽  
Momentum Transfer ◽  
Form Factors ◽  
Nucleon Nucleon ◽  
Meson Exchange ◽  
Current Conservation ◽  
Meson Theory ◽  
Transfer Region ◽  
Magnetic Form Factors ◽  
Meson Exchange Currents

The magnetic form factors for the 3He and 3H nuclei have been calculated for different values of momentum transfer. The three-nucleon ground-state wave function is expressed in momentum space and is obtained from the solution of the Faddeev equations with realistic two-body potentials. The potential used is taken from the meson theory to include different meson-exchange contributions satisfying the requirements of current conservation. The different meson-exchange currents and their contributions to the trinucleon magnetic form factors are calculated. The virtual Δ-excitation and the meson–nucleon vertices form factors are included in the 3He and 3H magnetic-form-factors calculations. The present results show the importance of the higher momentum transfer region as being a good source of information to the short-range processes in the nuclear medium. Our results for the 3He and 3H magnetic form factors are in good agreements with the experimental data. The inclusion of the ρ and ω meson exchanges improves the agreement between positions of the minima of the magnetic form factors predicted and the experimental data.

scholarly journals Dispersion-theoretical analysis of the electromagnetic form factors of the nucleon: Past, present and future

2021 ◽  
Vol 57 (8) ◽  
Author(s):  
Yong-Hui Lin ◽  
Hans-Werner Hammer ◽  
Ulf-G. Meißner
Keyword(s):  
Theoretical Analysis ◽  
Bayesian Methods ◽  
Form Factors ◽  
Systematic Errors ◽  
Electromagnetic Form Factors ◽  
Detailed Calculation ◽  
Spectral Functions ◽  
Statistical Errors ◽  
Magnetic Form Factors

AbstractWe review the dispersion-theoretical analysis of the electromagnetic form factors of the nucleon. We emphasize in particular the role of unitarity and analyticity in the construction of the isoscalar and isovector spectral functions. We present new results on the extraction of the nucleon radii, the electric and magnetic form factors and the extraction of $$\omega $$ ω -meson couplings. All this is supplemented by a detailed calculation of the theoretical uncertainties, using bootstrap and Bayesian methods to pin down the statistical errors, while systematic errors are determined from variations of the spectral functions. We also discuss the physics of the time-like form factors and point out further issues to be addressed in this framework.

Delayed muon induced fission of209Bi and the role of meson-exchange currents

1992 ◽  
Vol 343 (1) ◽  
pp. 113-118 ◽  
Author(s):  
H. Paganetti ◽  
P. David ◽  
H. Hänscheid ◽  
J. Konijn ◽  
C. T. A. M. de Laat ◽  
...  
Keyword(s):  
Meson Exchange ◽  
Induced Fission ◽  
Meson Exchange Currents
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