284 research outputs found
Collisional deexcitation of exotic hydrogen atoms in highly excited states. II. Cascade calculations
The atomic cascades in mu-p and pbar-p atoms have been studied in detail
using new results for the cross-sections of the scattering of highly excited
exotic atoms from molecular hydrogen. The cascade calculations have been done
with an updated version of the extended standard cascade model that computes
the evolution in the kinetic energy from the beginning of the cascade. The
resulting X-ray yields, kinetic energy distributions, and cascade times are
compared with the experimental data.Comment: 13 pages, 23 figure
Collisional deexcitation of exotic hydrogen atoms in highly excited states. I. Cross-sections
The deexcitation of exotic hydrogen atoms in highly excited states in
collisions with hydrogen molecules has been studied using the
classical-trajectory Monte Carlo method. The Coulomb transitions with large
change of principal quantum number n have been found to be the dominant
collisional deexcitation mechanism at high n. The molecular structure of the
hydrogen target is shown to be essential for the dominance of transitions with
large \Delta n. The external Auger effect has been studied in the eikonal
approximation. The resulting partial wave cross-sections are consistent with
unitarity and provide a more reliable input for cascade calculations than the
previously used Born approximation.Comment: 10 pages, 20 figure
The radiative decay phi - gamma pi pi in a coupled channel model and the structure of f0(980)
A coupled channel model is used to study the nature of the scalar mesons
produced in the decay phi - gamma pi pi. The KKbar molecular picture of f0(980)
is found to be in a good agreement with the recent experimental data from SND
and CMD-2. The structure of the light scalar mesons is elucidated by
investigating the S-matrix poles and the qqbar spectral density.Comment: 20 pages, 18 PostScript figure
Sensitive Detection of Epithelial Ovarian Cancer Biomarkers Using Tag-Laser Induced Breakdown Spectroscopy
Higher Order Two Step Mechanisms in Nucleon Antinucleon Annihilation and the OZI Rule
We evaluate three meson doorway mechanisms for nucleon-antinucleon
annihilation at rest for the first time. Detailed results are presented for the
final state phi pi0 originating from the 3S1 initial state and for the phi rho
channel originating from 1S0. The results presented also include the improved
contributions from two meson doorway states and from the tree diagrams. For all
the channels considered a consistent explanation of large and small OZI
violations emerges.Comment: 18 pages, 2 PostScript figures, will be published in Eur. Phys. J.
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