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 A Six-Quark Dressed-Bag Description of np→dγ Radiative Capture

2003 ◽  
Vol 12 (04) ◽  
pp. 449-478 ◽  
Author(s):  
M. M. Kaskulov ◽  
P. Grabmayr ◽  
V. I. Kukulin
Keyword(s):  
Cross Sections ◽  
Radiative Capture ◽  
Form Factors ◽  
Nucleon Nucleon ◽  
Pion Exchange ◽  
Exchange Current ◽  
Meson Exchange ◽  
Capture Process ◽  
Nucleon Nucleon Interaction ◽  
Meson Exchange Currents

The radiative capture process np→dγ is considered within the framework of a recently developed six-quark dressed-bag model for the nucleon-nucleon interaction. The calculations presented here include both the nucleon current and the meson-exchange current contributions. The latter uses short-range hadronic form factors for the pion exchange currents consistent with the soft cut-off parameter ΛπNN from the NN-potential. Contributions of the pion exchange current and Δ-isobar current to the total cross-section still cannot explain the discrepancy between the theoretical and experimental cross-sections. Possibilities for new types of meson exchange currents associated with chiral fields inside multi-quark dressed-bag states in nuclei are discussed.

PROTON-NUCLEUS ELASTIC SCATTERING AT ~1 GeV AND THE NN AMPLITUDE

2007 ◽  
Vol 16 (06) ◽  
pp. 1741-1755 ◽  
Author(s):  
Z. A. KHAN ◽  
MINITA SINGH
Keyword(s):  
Elastic Scattering ◽  
Momentum Transfer ◽  
Form Factors ◽  
Matter Density ◽  
Additional Information ◽  
Density Distributions ◽  
Transfer Region ◽  
Realistic Form ◽  
Basic Input

Working within the framework of Coulomb modified correlation expansion of the Glauber amplitude, we analyse the elastic scattering of ~1 GeV protons on 4 He , 12 C , 16 O and 40 Ca nuclei. Emphasis has been put on the use of different parametrizations of the basic (input) NN amplitude, which provide equivalently good accounts of the elastic NN scattering observables up to the available momentum transfer region. Using realistic form factors for target nuclei, it is found that the proton-nucleus collisions could provide a test to know which is the better choice of the NN amplitude. The analysis also considers the possibility of extracting some additional information about the matter density distributions.

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

scholarly journals Inelastic Form Factor Calculations for 46,48,50Ti Isotopes Using Tassie Model

2021 ◽  
Vol 2021 ◽  
pp. 1-4
Author(s):  
Mohanad H. Oleiwi
Keyword(s):  
Experimental Data ◽  
Wave Function ◽  
Momentum Transfer ◽  
Good Description ◽  
Effective Interaction ◽  
Form Factors ◽  
Model Space ◽  
Single Particle Wave Function ◽  
Particle Wave Function ◽  
Theoretical Results

Inelastic form factors of electrical transition have been calculated for 46,48,50Ti isotopes using the Tassie model. The form factors have been calculated for different exciting energies. The harmonic oscillator (HO) wave function has been used as a single-particle wave function. The model space has been considered as 1f7/2, 2p3/2, 2p1/2, and 2f5/2. Gx1 has been used as effective interaction in all calculations. In all calculations, the effective charge has been considered as 1.5e for proton and 0.5e for neutron. All obtained results have been compared with data from an experiment. The calculations show the Tassie model gives a good description of longitudinal form factors of 46,48,50Ti isotopes in E(2+) transitions as compared with experimental data, especially in the region below 2 fm−1 of momentum transfer, but in the E(4+), the theoretical results deviated slightly from experimental data especially in the region greater than 1.5 fm−1 of momentum transfer.

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