Calculations of the effective nuclear charge for elements with 1≤ Z≤ 118 have been
performed in a Dirac–Fock approach including all relativistic effects as well as contributions …

Significant effort has been devoted to searching for new fundamental forces of nature. At
short length scales (below approximately 10 nm), the strongest experimental constraints …

Using a new result on the integral involving the product of Bessel functions and associated
Laguerre polynomials, published in the mathematical literature some time ago, we present …

We developed a method to calculate two-photon processes in quantum mechanics that
replaces the infinite summation over the intermediate states by a perturbation expansion …

A computational method is developed for photon-atom scattering cross-sections given by the
p· A interaction, which dominates scattering at low frequencies. Our method is simple and …

A bound state of muon and anti-muon (true muonium or dimuonium), although predicted
long ago [1, 2, 3, 4], has never been observed experimentally. Many mechanisms for the …

In this paper x-ray mass attenuation coefficients of nickel were measured with precision
between 0.2% and 0.5% for four characteristic wavelengths: copper and molybdenum K …