261 research outputs found
Three bit mass spectral search program
Computer program is developed to interpret spectral data in order to assist chemist in identifying low resolution mass spectra. Two versions of program, using approximately same amount of core are available. In both programs, core requirements are roughly proportional to maximum number of unknowns to be handled on each pass through tape
Gyromagnetic Ratios of Bound Particles
A new approach to calculation of the binding corrections to the magnetic
moments of the constituents in a loosely bound system, based on the
Bargmann-Michel-Telegdi equation, is suggested. Binding corrections are
calculated in this framework, and the results confirm earlier calculations
performed by other methods. Our method clearly demonstrates independence of the
binding corrections on the magnitude of the spin of the constituents.Comment: 10 pages, RevTe
The Self-Force of a Charged Particle in Classical Electrodynamics with a Cut-off
We discuss, in the context of classical electrodynamics with a Lorentz
invariant cut-off at short distances, the self-force acting on a point charged
particle. It follows that the electromagnetic mass of the point charge occurs
in the equation of motion in a form consistent with special relativity. We find
that the exact equation of motion does not exhibit runaway solutions or
non-causal behavior, when the cut-off is larger than half of the classical
radius of the electron.Comment: 17 pages, 1 figur
Exchange Current Operators and Electromagnetic Dipole Transitions in Heavy Quarkonia
The electromagnetic E1 and M1 transitions in heavy quarkonia (,
, ) and the magnetic moment of the are calculated
within the framework of the covariant Blankenbecler-Sugar (BSLT) equation. The
aim of this paper is to study the effects of two-quark exchange current
operators which involve the interaction, that arise in the BSLT (or
Schr\"odinger) reduction of the Bethe-Salpeter equation. These are found to be
small for E1 dominated decays such as and
, but significant for the M1 dominated
transitions. It is shown that a satisfactory description of the empirical data
on E1 and M1 transitions in charmonium and bottomonium requires unapproximated
treatment of the Dirac currents of the quarks. Finally, it is demonstrated that
many of the transitions are sensitive to the form of the
wavefunctions, and thus require a realistic treatment of the large hyperfine
splittings in the heavy quarkonium systems.Comment: 30 pages, 2 figures, uses Feynmf. Submitted to Nucl. Phys. A Accepted
versio
The g factor of proton
We consider higher order corrections to the g factor of a bound proton in
hydrogen atom and their consequences for a magnetic moment of free and bound
proton and deuteron as well as some other objects
Nuclear structure corrections to gyromagnetic factor of the bound lepton
In the framework of the quasipotential method the covariant expression for
the two-particle vertex operator is obtained. The nuclear structure corrections
of orders (Z\alpha)^4, (Z\alpha)^5 including recoil effects to gyromagnetic
factors of the bound electron and muon are calculated. Numerical value of the
contribution of order (Z\alpha)^5 is obtained by means of the dipole
parameterization for the nuclear charge form factor in the range of the nuclear
charges Z=7-32.Comment: Talk presented on poster session of the Bogolubov Conference
"Problems of Theoretical and Mathematical Physics", Moscow-Dubna, September
2-6, 2004, 14 pages, 2 figure
Stimulated Neutrino Conversion and Bounds on Neutrino Magnetic Moments
Recent experiment proposed to observe induced radiative neutrino transitions
are confronted to existing bounds on neutrino magnetic moments from earth-based
experiments. These are found to exclude any observation by several orders of
magnitude, unless the magnetic moments are assumed to be strongly momentum
dependent. This possibility is discussed in some generality, and we find that
nontrivial dependence of the neutrino form factor may indeed occur, leading to
quite unexpected effects, although this is insufficient by orders of magnitude
to justify the experiments.Comment: one reference modified + minor changes, 8 pages, plain Late
The accelerated observer and quantum effects
An extended monopole detector at constant acceleration coupled to a massless
scalar field is allowed to evolve quantum mechanically. It is found that while
in the classical, followed by the point particle, limit the usual result Unruh
effect is recovered, in the point particle (before the classical) limit the
detector decouples from the scalar field and therefore the effect disappears.Comment: Plain Tex, 10 page
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