Model investigation on the probability of QGP formation at different centralities in relativistic heavy ion collisions

Abstract

The quantitative dependence of quark-gluon plasma (QGP)-formation probability (P QGP ) on the centrality of Au-Au collisions is studied using a bond percolation model. The P QGP versus the maximum distance S max for a bond to form is calculated from the model for various nuclei and the P QGP at different centralities of Au-Au collisions for the given S max are obtained therefrom. The experimental data of the nuclear modification factor R AA (p T ) for the most central Au-Au collisions at √ s NN = 200 and 130 GeV are utilized to transform S max to √ s NN . The P QGP for different centralities of Au-Au collisions at these two energies are thus obtained, which is useful for correctly understanding the centrality dependence of the experimental data.

Coupled-channels study of fine structure in theαdecay of platinum isotopes

“…The available theoretical approaches for deformed systems can be divided into two groups, namely, semiclassical and coupledchannels. Some semiclassical methods, based on the onedimensional Wentzel-Kramers-Brillouin (WKB) semiclassical approximation, have been extended from the spherical picture to a deformed case in a phenomenological manner, such as the simple WKB barrier penetration approach [1], the generalized liquid drop model (GLDM) [2], and the unified model for α decay and α capture (UMADAC) [3]. The other group uses the stationary coupled-channels approach [4][5][6][7][8], where the three-dimensional Schrödinger equation is exactly solved with outgoing wave boundary conditions.…”