Helm model interpretation of 16O form factors: application to pion photoproduction and muon capture

1980 ◽  
Vol 58 (1) ◽  
pp. 48-62 ◽  
Author(s):  
R. D. Graves ◽  
B. A. Lamers ◽  
Anton Nagl ◽  
H. Überall ◽  
V. Devanathan ◽  
...  
Keyword(s):  
Form Factor ◽  
Electron Scattering ◽  
Form Factors ◽  
Muon Capture ◽  
Physical Parameters ◽  
Medium Energy ◽  
Model Interpretation ◽  
Charged Pions ◽  
Transition Densities ◽  
Energy Processes

The available experimental data for the form factors of the T = 1 levels in 16O, obtained from electron scattering at low (Darmstadt), medium (Tohoku), and high momentum transfer (Stanford), are interpreted by the generalized Helm model. This phenomenological model reduces the form factor description of each level to the listing of a few physical parameters, i.e., the radius and smearing width of the transition densities of charge (current) and magnetization, and their corresponding strength constants. Its parameters having been determined by the form factor fits, the model may then be used to predict the results of other medium energy processes; this is done here for the photoproduction of charged pions and for muon capture in16O.

scholarly journals THE NUCLEON'S MIRROR IMAGE: REVEALING THE STRANGE AND UNEXPECTED

2003 ◽  
Vol 18 (02n06) ◽  
pp. 75-84 ◽  
Author(s):  
R. D. MCKEOWN
Keyword(s):  
Form Factor ◽  
Electron Scattering ◽  
Strange Quark ◽  
Form Factors ◽  
Mirror Image ◽  
Vector Form ◽  
Electromagnetic Structure ◽  
Extensive Program ◽  
Axial Form ◽  
Insight Into

An extensive program of parity-violating electron scattering experiments is providing new insight into the structure of the nucleon. Measurement of the vector form factors enables a definitive study of potential strange quark-antiquark contributions to the nucleon's electromagnetic structure, including the magnetic moment and charge distribution. Recent experimental results have already indicated that effects of strangeness are much smaller than theoretically expected. In addition, the neutral axial form factor appears to display substantial corrections as one might expect from an anapole effect.

THE BLAST EXPERIMENT: POLARIZED ELECTRON SCATTERING FROM HYDROGEN AND DEUTERIUM

2009 ◽  
Vol 24 (11n13) ◽  
pp. 875-880
Author(s):  
◽  
R. ALARCON
Keyword(s):  
Form Factor ◽  
Electron Scattering ◽  
Form Factors ◽  
Proton Form Factor ◽  
Beam Source ◽  
Polarized Electrons ◽  
Deuterium Target ◽  
Factor Ratio ◽  
Nucleon Form Factors ◽  
Large Acceptance

At the MIT-Bates Linear Accelerator Center, the nucleon form factors have been measured by scattering polarized electrons from vector-polarized hydrogen and deuterium. The experiment used the longitudinally polarized electron beam stored in the MIT-Bates South Hall Ring along with an isotopically pure, highly vector-polarized internal atomic hydrogen and deuterium target provided by an atomic beam source. The measurements were carried out with the symmetric Bates Large Acceptance Spectrometer Toroid (BLAST). Results are presented for the proton form factor ratio, [Formula: see text], and for the charge form factor of the neutron, [Formula: see text]. Both results are more precise than previous data in the corresponding Q2 ranges.

ON THE SEARCH FOR THE SCISSORS MODE

1993 ◽  
Vol 08 (13) ◽  
pp. 1171-1178 ◽  
Author(s):  
ROLAND NOJAROV ◽  
AMAND FAESSLER
Keyword(s):  
Wave Function ◽  
Form Factor ◽  
Form Factors ◽  
Transition Density ◽  
Light Nuclei ◽  
Heavy Nuclei ◽  
Deformed Nuclei ◽  
Scissors Mode ◽  
Transition Densities ◽  
Rotor Model

Results from quasiparticle RPA calculations on 1+ excitations in deformed nuclei, including M1 transition densities and (e, e′) form factors, are compared to the microscopic representation of the scissors state of the two-rotor model. Although this state is too collective, especially in heavy nuclei, it fragments mainly over the low lying orbital M1 excitations, which can be interpreted as a manifestation of a weakly collective scissors mode. The experimentally observed strongest M1 excitation has the same leading components in the wave function as the scissors state, the largest overlap with it, and similar transition density and form factor. Although the scissors mode is more pronounced in heavy deformed nuclei, the strong low lying orbital M1 excitations in lighter nuclei represent a better approximation to it, because the scissors state is less collective in light nuclei.

THE ROLE OF LINEAR ALPHA-CLUSTER CONFIGURATION FOR 12C

2002 ◽  
Vol 11 (05) ◽  
pp. 359-367 ◽  
Author(s):  
K. A. GRIDNEV ◽  
M. P. KARTAMYSHEV ◽  
J. S. VAAGEN ◽  
V. K. LUKYANOV ◽  
G. S. ANAGNOSTATOS
Keyword(s):  
Form Factor ◽  
Electron Scattering ◽  
Cluster Model ◽  
Form Factors ◽  
Rotational Bands ◽  
Cluster Configuration ◽  
Consistent Picture ◽  
Alpha Cluster

In the framework of the Alpha Cluster Model extended calculations of form factors of elastic and inelastic [Formula: see text] and [Formula: see text] (7.66 MeV) electron scattering on 12C were performed. Two possible alpha cluster configurations (linear and triangular) were considered for states assigned to different rotational bands and although the configuration mixture was found to be important for explanation of the inelastic monopole form factor, a fully consistent picture, including all available data, was not obtained.

Elastic Longitudinal Electron Scattering form Factors of 9Be

2011 ◽  
Vol 14 (2) ◽  
pp. 116-122 ◽  
Author(s):  
R.A. Radhi ◽  
◽  
N.M. Adeeb ◽  
A.K. Hashim ◽  
◽  
...  
Keyword(s):  
Electron Scattering ◽  
Form Factors

Form factor calculations for some light nuclei in the framework of electron scattering

2020 ◽  
Author(s):  
Shaimaa A. Abbas ◽  
Khalid H. Mahdi ◽  
Necla Cakmak
Keyword(s):  
Form Factor ◽  
Electron Scattering ◽  
Light Nuclei

Calculation of charge form factor of elastic electron scattering based on Skyrme force and relativistic eikonal approximation

2019 ◽  
Vol 28 (03) ◽  
pp. 1950015
Author(s):  
Xiaoyong Guo ◽  
Zaijun Wang ◽  
Tianjing Li ◽  
Jian Liu
Keyword(s):  
Electron Scattering ◽  
Mean Field ◽  
Form Factors ◽  
Eikonal Approximation ◽  
Skyrme Force ◽  
Elastic Electron ◽  
Elastic Electron Scattering ◽  
Charge Form ◽  
Relativistic Treatment ◽  
Rmf Model

We construct a scheme to calculate the charge form factors for the elastic electron scattering. Our calculation is based on the relativistic eikonal approximation and the Skyrme–Hartree–Fock equation. To perform our calculation and benchmark the results, eight model nuclei with available experimental data: [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text] are considered. For the comparison, the charge form factors calculated by the relativistic mean-field (RMF) model are also provided. Parameter set SLy5 is utilized for the Skyrme force, and the set NL3 is applied for the RMF model. It has been confirmed that combining of a nonrelativistic treatment for the target nucleus with a relativistic treatment for the incident electron may work better to reach highly descriptive and predictive results similar to the pure relativistic treatment. The results of this work are also useful for future experiments to test different inputs of densities for a specific nucleus.

Sign in / Sign up

Export Citation Format

Share Document