Asymptotic Regge Trajectories of Non-strange Mesons

We analyze the asymptotic behavior of Regge trajectories of non-strange mesons. In contrast to an existing belief, it is demonstrated that for the asymptotically linear Regge trajectories the width of heavy hadrons cannot linearly depend on their mass. Using the data on masses and widths of rho_J, omega_J, a_J and f_J mesons for the spin values J \leq 6, we extract the parameters of the asymptotically linear Regge trajectory predicted by the finite width model of quark gluon bags. As it is shown the obtained parameters for the data set B correspond to the cross-over temperature lying in the interval 170.9-175.3 MeV which is consistent with the kinetic freeze-out temperature of early hadronizing particles found in relativistic heavy ion collisions at and above the highest SPS energy.Comment: 14 pages, 3 figure

Analysis of pseudo-continuous bands of soft X-ray spectra from a laser-irradiated highly ionized W plasma

On the Xingguang II laser facilities, the soft X-ray spectra of a laser produced plasma of highly ionized 74W in wavelength range 0.36-0.52nm have been investigated with a plane crystal spectrograph. Four resonance lines in Ni-like ions, sixteen broad, characteristic, pseudo-continuous transition bands in Cu-, Zn-, Ca- and Ge-like ions, were measured and identified. The results show that the relativistic Spin-orbit-Split Arrays (SOSA) model, a particular case of Unresolved Transition Arrays (UTA), and the X method were proved by using this analysis: The succinct formulas of mean wavelength vs ionized stage are achieved. The data of experiment and calculation have important signification for plasma diagnostics.link_to_subscribed_fulltex