1,871 research outputs found
Two components in charged particle production in heavy-ion collisions
Transverse momentum spectra of charged particle production in heavy-ion
collisions are considered in terms of a recently introduced Two Component
parameterization combining exponential ("soft") and power-law ("hard")
functional forms. The charged hadron densities calculated separately for them
are plotted versus number of participating nucleons, . The obtained
dependences are discussed and the possible link between the two component
parameterization introduced by the authors and the two component model
historically used for the case of heavy-ion collisions is established. Next,
the variations of the parameters of the introduced approach with the center of
mass energy and centrality are studied using the available data from RHIC and
LHC experiments. The spectra shapes are found to show universal dependences on
for all investigated collision energies.Comment: a version as to appear in NPB after editorial comment
Buffer-gas induced absorption resonances in Rb vapor
We observe transformation of the electromagnetically induced transparency
(EIT) resonance into the absorption resonance in a interaction
configuration in a cell filled with Rb and a buffer gas. This
transformation occurs as a one-photon detuning of the coupling fields is varied
from the atomic transition. No such absorption resonance is found in the
absence of a buffer gas. The width of the absorption resonance is several times
smaller than the width of the EIT resonance, and the changes of absorption near
these resonances are about the same. Similar absorption resonances are detected
in the Hanle configuration in a buffered cell.Comment: 11 pages, 15 figures; 13 pages, 17 figures, added numerical
simulatio
Ultralow-power local laser control of the dimer density in alkali-metal vapors through photodesorption
Ultralow-power diode-laser radiation is employed to induce photodesorption of
cesium from a partially transparent thin-film cesium adsorbate on a solid
surface. Using resonant Raman spectroscopy, we demonstrate that this
photodesorption process enables an accurate local optical control of the
density of dimer molecules in alkali-metal vapors.Comment: 4 pages, 4 figure
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