254 research outputs found
A perturbative treatment for the energy levels of neutral atoms
Energy levels of neutral atoms have been re-examined by applying an
alternative perturbative scheme in solving the Schrodinger equation for the
Yukawa potential model with a modified screening parameter. The predicted shell
binding energies are found to be quite accurate over the entire range of the
atomic number up to 84 and compare very well with those obtained within the
framework of hyper-virial-Pade scheme and the method of shifted large-N
expansion. It is observed that the new perturbative method may also be applied
to the other areas of atomic physics.Comment: 18 page
An Alternative Treatment for Yukawa-Type Potentials
We propose a new approximation scheme to obtain analytic expressions for the
bound state energies and eigenfunctions of Yukawa like potentials. The
predicted energies are in excellent agreement with the accurate numerical
values reported in the literature
Two Electrons in a Quantum Dot: A Unified Approach
Low-lying energy levels of two interacting electrons confined in a
two-dimensional parabolic quantum dot in the presence of an external magnetic
field have been revised within the frame of a novel model. The present
formalism, which gives closed algebraic solutions for the specific values of
magnetic field and spatial confinement length, enables us to see explicitly
individual effects of the electron correlation.Comment: 14 page
Mapping of non-central potentials under point canonical transformations
Motivated by the observation that all known exactly solvable shape invariant
central potentials are inter-related via point canonical transformations, we
develop an algebraic framework to show that a similar mapping procedure is also
exist between a class of non-central potentials. As an illustrative example, we
discuss the inter-relation between the generalized Coulomb and oscillator
systems.Comment: 11 pages article in LaTEX (uses standard article.sty). Please check
http://www1.gantep.edu.tr/~gonul for other studies of Nuclear Physics Group
at University of Gaziante
Exact solution of Schrodinger equation for modified Kratzer's molecular potential with the position-dependent mass
Exact solutions of Schrodinger equation are obtained for the modified Kratzer
and the corrected Morse potentials with the position-dependent effective mass.
The bound state energy eigenvalues and the corresponding eigenfunctions are
calculated for any angular momentum for target potentials. Various forms of
point canonical transformations are applied. PACS numbers: 03.65.-w; 03.65.Ge;
12.39.Fd Keywords: Morse potential, Kratzer potential, Position-dependent mass,
Point canonical transformation, Effective mass Schr\"{o}dinger equation.Comment: 9 page
A note on the Woods-Saxon potential
The wave Schrodinger and, to clarify one interesting point encountered in the
calculations, Klein-Gordon equations are solved exactly for a single neutron
moving in a central Woods-Saxon plus an additional potential that provides a
flexibility to construct the surface structure of the related nucleus. The
physics behind the solutions and the reliability of the results obtained are
discussed carefully with the consideration of other related works in the
literature. In addition, the exhaustive analysis of the results reveals the
fact that the usual Woods-Saxon potential cannot be solved analytically within
the framework of non-relativistic physics, unlike its exactly solvable
relativistic consideration
Supersymmetry and the relationship between a class of singular potentials in arbitrary dimensions
The eigenvalues of the potentials
and
, and of the special cases of these potentials such as the Kratzer and
Goldman-Krivchenkov potentials, are obtained in N-dimensional space. The
explicit dependence of these potentials in higher-dimensional space is
discussed, which have not been previously covered.Comment: 13 pages article in LaTEX (uses standard article.sty). Please check
"http://www1.gantep.edu.tr/~ozer" for other studies of Nuclear Physics Group
at University of Gaziante
A general scheme for the effective-mass Schrodinger equation and the generation of the associated potentials
A systematic procedure to study one-dimensional Schr\"odinger equation with a
position-dependent effective mass (PDEM) in the kinetic energy operator is
explored. The conventional free-particle problem reveals a new and interesting
situation in that, in the presence of a mass background, formation of bound
states is signalled. We also discuss coordinate-transformed, constant-mass
Schr\"odinger equation, its matching with the PDEM form and the consequent
decoupling of the ambiguity parameters. This provides a unified approach to
many exact results known in the literature, as well as to a lot of new ones.Comment: 16 pages + 1 figure; minor changes + new "free-particle" problem;
version published in Mod. Phys. Lett.
The relative influence of advice from human experts and statistical methods on forecast adjustments
Decision makers and forecasters often receive advice from different sources including human experts and statistical methods. This research examines, in the context of stock price forecasting, how the apparent source of the advice affects the attention that is paid to it when the mode of delivery of the advice is identical for both sources. In Study 1, two groups of participants were given the same advised point and interval forecasts. One group was told that these were the advice of a human expert and the other that they were generated by a statistical forecasting method. The participants were then asked to adjust forecasts they had previously made in light of this advice. While in both cases the advice led to improved point forecast accuracy and better calibration of the prediction intervals, the advice which apparently emanated from a statistical method was discounted much more severely. In Study 2, participants were provided with advice from two sources. When the participants were told that both sources were either human experts or both were statistical methods, the apparent statistical-based advice had the same influence on the adjusted estimates as the advice that appeared to come from a human expert. However when the apparent sources of advice were different, much greater attention was paid to the advice that apparently came from a human expert. Theories of advice utilization are used to identify why the advice of a human expert is likely to be preferred to advice from a statistical method. © 2009 John Wiley & Sons, Ltd
Quantization rule solution to the Hulth\'en potential in arbitrary dimension by a new approximate scheme for the centrifugal term
The bound state energies and wave functions for a particle exposed to the
Hulth\'en potential field in the D-dimensional space are obtained within the
improved quantization rule for any arbitrary l state. The present approximation
scheme used to deal with the centrifugal term in the effective Hulth\'en
potential is systematic and accurate. The solutions for the three-dimensional
(D=3) case and the s-wave (l=0) case are briefly discussed.
Keywords: Hulth\'en potential, improved quantization rule, approximation
schemes.
03.65.Ge, 12.39.JhComment: 15 pages. arXiv admin note: substantial text overlap with
arXiv:1009.508
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