Photomagnetic disintegration and magnetic moment of the deuteron in the meson theory

1940 ◽  
Vol 36 (3) ◽  
pp. 351-362 ◽  
Author(s):  
S. T. Ma
Keyword(s):  
Electromagnetic Field ◽  
Magnetic Dipole ◽  
Cross Section ◽  
Magnetic Moment ◽  
Dipole Moments ◽  
External Electromagnetic Field ◽  
Nuclear System ◽  
Multipole Moments ◽  
Early Stages ◽  
Meson Theory

The interaction between an external electromagnetic field and a nuclear system can be expressed in terms of the multipole moments. The electric quadripole and the magnetic dipole moments of the deuteron have been calculated, taking into account the exchange forces as given by the meson theory. The cross-section of the photomagnetic effect of the deuteron has been calculated.This work was carried out under the guidance of Dr Heitler and Dr Fröhlich. The writer wishes to express his sincerest thanks to them for suggesting the problem and many valuable comments. The writer is also indebted to Dr Kahn for discussions during the early stages of this work.

Electromagnetic energy of electric and magnetic dipoles

2013 ◽  
Vol 91 (7) ◽  
pp. 576-581 ◽  
Author(s):  
A.L. Kholmetskii ◽  
O.V. Missevitch ◽  
T. Yarman
Keyword(s):  
Electromagnetic Field ◽  
Magnetic Dipole ◽  
Electric Dipole ◽  
Dipole Moments ◽  
External Electromagnetic Field ◽  
Laboratory Frame ◽  
Relativistic Energy ◽  
Relativistic Case ◽  
Magnetic Dipoles ◽  
Relativistic Dependence

We derive a novel expression for the relativistic energy of electric and magnetic dipoles in an external electromagnetic field and discuss its implications. In particular, we find the relativistic dependence of the energy of a dipole on its velocity, v, and show that in the most convenient presentation of the energy (when the proper electric (p0) and magnetic (m0) dipole moments are involved, whereas the electric (E) and magnetic (B) fields are defined in the laboratory frame), its value essentially depends on the orientation of the velocity, v, with respect to vectors p0, E, and m0, B. To better understand the relativistic behavior of the energy of electric and magnetic dipoles, we introduce the notion of “latent” momentum of an electric dipole, in addition to the known concept of “hidden” momentum of a magnetic dipole. We finally show that the contribution of energy terms related to “hidden” and “latent” momenta of an electric or magnetic dipole is important in the relativistic case.

The electrostatic dipole moment of a nucleus in the meson theory

1940 ◽  
Vol 36 (4) ◽  
pp. 438-440
Author(s):  
S. T. Ma
Keyword(s):  
Electromagnetic Field ◽  
Dipole Moment ◽  
Vector Potential ◽  
Scalar Potential ◽  
External Electromagnetic Field ◽  
Meson Field ◽  
Multipole Moments ◽  
Meson Theory

The interaction between an external electromagnetic field and a nucleus, including its exchange meson field, has recently been investigated by several authors (1). The interaction between a vector potential A and a nucleus has been found to be expressible in terms of the electric and magnetic multipole moments of the latter. It is the object of this note to discuss the corresponding interaction with a scalar potential V, and its connexion with previous results.

Resonant production of electron-positron pairs by a hard gamma-ray on a nucleus in an external electromagnetic field

2020 ◽  
Vol 35 (03) ◽  
pp. 2040025 ◽  
Author(s):  
Nikita R. Larin ◽  
Victor V. Dubov ◽  
Sergei P. Roshchupkin
Keyword(s):  
Electromagnetic Field ◽  
Differential Cross Section ◽  
External Field ◽  
Cross Section ◽  
Differential Cross ◽  
Gamma Ray ◽  
Structure Constant ◽  
External Electromagnetic Field ◽  
Electron Positron ◽  
Resonant Production

The resonant production of electron-positron pairs by a hard gamma-ray on nucleus in an external electromagnetic field is studied theoretically. The main property of this process is that the initial process of the second order in the fine structure constant in an external field effectively splits into two successive processes of the first order due to the fact that in resonant conditions intermediate virtual electron (positron) becomes a real particle. One of these processes is a single-photoproduction of electron-positron pair in a laser field (laser-stimulated Breit-Wheeler process) another is a laser-assisted scattering of electron (positron) on nucleus (laser-assisted Mott scattering). It is shown that the resonances are possible only for the energies of the initial hard gamma-ray more than the characteristic threshold energy. Resonant differential cross section of this process is obtained. It is shown that the resonant differential cross section can significantly exceed the corresponding cross section without an external field. The obtained results may be experimentally verified using the facilities of pulsed laser radiation (SLAC, FAIR, XFEL, ELI, XCELS).

scholarly journals LARGE MAGNETIC DIPOLE MOMENTS FOR NEUTRINOS WITH ARBITRARY NON-CALCULABLE MASSES

2001 ◽  
Vol 16 (25) ◽  
pp. 1605-1614 ◽  
Author(s):  
J. C. MONTERO ◽  
V. PLEITEZ
Keyword(s):  
Magnetic Dipole ◽  
Magnetic Moment ◽  
Dipole Moments ◽  
Neutral Currents ◽  
Main Ingredient ◽  
Effective Interactions ◽  
Neutrino Sector ◽  
Flavor Changing ◽  
Model Independent ◽  
Large Magnetic Moment

We show that there is a general sort of neutrino effective interactions which allows, under certain conditions, to have relatively large magnetic dipole moments for neutrinos while keeping their masses non-calculable and arbitrarily small. The main ingredient of our mechanism for generating large magnetic moment to the neutrinos is the existence of a neutral scalar which has the only role to give mass to the neutrinos or the existence of flavor changing neutral currents in the neutrino sector. Although our approach is model independent, some models in which those interactions arise are commented.

Geometric phases modified by a Lorentz-symmetry violation background

2015 ◽  
Vol 30 (14) ◽  
pp. 1550072 ◽  
Author(s):  
L. R. Ribeiro ◽  
E. Passos ◽  
C. Furtado ◽  
J. R. Nascimento
Keyword(s):  
Electromagnetic Field ◽  
Geometric Phase ◽  
Quantum Dynamics ◽  
Dipole Moments ◽  
External Electromagnetic Field ◽  
Lorentz Symmetry ◽  
Nonrelativistic Quantum ◽  
Symmetry Violation ◽  
Electric Dipole Moments ◽  
Geometric Phases

We analyze the nonrelativistic quantum dynamics of a single neutral spin-half particle, with nonzero magnetic and electric dipole moments, moving in an external electromagnetic field in the presence of a Lorentz-symmetry violating background. We also study the geometric phase for this model taking in account the influence of the parameter that breaks the Lorentz-symmetry. These geometric phases are used to impose an upper bound on the background magnitude.

scholarly journals A New Solution of the Einstein-Maxwell Equations for a System with Mass, Magnetic Moment, Charge, and Angular momentum

1974 ◽  
Vol 64 ◽  
pp. 192-192
Author(s):  
Louis Witten
Keyword(s):  
Black Hole ◽  
Angular Momentum ◽  
Magnetic Dipole ◽  
Electric Charge ◽  
Magnetic Moment ◽  
Maxwell Equations ◽  
Black Hole Physics ◽  
Red Shift ◽  
Multipole Moments ◽  
Asymptotically Flat

A five parameter solution of the combined Einstein-Maxwell equations is given which describes a source containing mass, electric charge, magnetic dipole, higher multipole moments of all three kinds, and angular momentum. The solution is asymptotically flat and has a singular infinite red shift surface. Possible relevance of the solution to black hole physics is discussed.

Resonant annihilation and production of high-energy electron-positron pairs in an external electromagnetic field

2020 ◽  
Vol 35 (03) ◽  
pp. 2040023 ◽  
Author(s):  
D. V. Doroshenko ◽  
V. V. Dubov ◽  
S. P. Roshchupkin
Keyword(s):  
Electromagnetic Field ◽  
Cross Section ◽  
Threshold Energy ◽  
External Electromagnetic Field ◽  
High Energy ◽  
Energy Electron ◽  
High Energy Electron ◽  
Annihilation Channel ◽  
Positron Scattering ◽  
Electron Positron

A resonant process of annihilation and production of high-energy electron-positron pairs in an external electromagnetic field is studied theoretically. This process is the annihilation channel of an electron-positron scattering. It is shown that the resonance in an external electromagnetic field is possible only when the certain combination of electron and positron initial energies is more than threshold energy. Also, the angle between initial electron and initial positron momenta directions must be small and satisfy the resonant conditions. This angle is determined by the high-energy of the initial pair and the threshold energy. An emerging electron-positron pair also flies out in a narrow cone along the direction of the initial pair and must be ultrarelativistic. For each fixed angle, energies of the final electron and positron can take from one to two values. It is shown that the resonant differential cross section can significantly exceed the corresponding Bhabha cross section without an external field.

Neoclassical diffusion of a finite-β, tokamak plasma

1972 ◽  
Vol 7 (3) ◽  
pp. 427-434 ◽  
Author(s):  
Aldo Nocentini
Keyword(s):  
Electromagnetic Field ◽  
Aspect Ratio ◽  
Cross Section ◽  
Circular Cross Section ◽  
External Electromagnetic Field ◽  
Tokamak Plasma ◽  
Temperature Profiles ◽  
Small Aspect Ratio ◽  
Magnetic Surfaces ◽  
Ratio Limit

The neoclassical diffusion in a tokamak is calculated for a finite-β plasma. The flux of the particles is shown to be substantially unchanged, with respect to the low-β case. The ‘equilibrium’ equation is derived. From it the magnetic surfaces can be obtained, once the external electromagnetic field and the density and temperature profiles are given. The case of magnetic surfaces with circular cross-section, in the small aspect ratio limit, is considered in detail.

A theoretical investigation of the magnetic dipole moment of the ground- and excited-states below 600keV in well-deformed 183,185W, 185,187Re and 187,189Os

2019 ◽  
Vol 28 (06) ◽  
pp. 1950040
Author(s):  
E. Tabar
Keyword(s):  
Excited States ◽  
Magnetic Dipole ◽  
Magnetic Moment ◽  
Dipole Moments ◽  
Mean Field ◽  
Spin Interaction ◽  
Nuclear Model ◽  
Saxon Potential ◽  
Axially Symmetric ◽  
Effective Spin

Magnetic dipole moments of the ground- and excited-states below 600[Formula: see text]keV in [Formula: see text]W, [Formula: see text]Re and [Formula: see text]Os nuclei have been systematically studied in the framework of a microscopic Quasiparticle Phonon Nuclear Model (QPNM) including an axially symmetric Wood–Saxon potential as a mean field and the residual spin–spin interaction. The obtained results of the magnetic moment, intrinsic [Formula: see text] factor and the effective spin gyromagnetic factor have been compared with the available experimental data and also with the calculations based on different approaches. It has been demonstrated that the QPNM reproduces reasonably well the recent experimental value of the ground-state magnetic moment and satisfactorily describes the measured magnetic moment of low-lying states below 600[Formula: see text]keV in these nuclei.

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