175,110 research outputs found
Transverse emission of isospin ratios as a probe of high-density symmetry energy in isotopic nuclear reactions
Transverse emission of preequilibrium nucleons, light clusters (complex
particles) and charged pions from the isotopic Sn+Sn
reactions at a beam energy of 400\emph{A} MeV, to extract the high-density
behavior of nuclear symmetry energy, are investigated within an isospin and
momentum dependent transport model. Specifically, the double ratios of
neutron/proton, triton/helium-3 and in the squeeze-out domain
are analyzed systematically, which have the advantage of reducing the influence
of the Coulomb force and less systematic errors. It is found that the
transverse momentum distribution of isospin ratios strongly depend on the
stiffness of nuclear symmetry energy, which would be a nice observable to
extract the high-density symmetry energy. The collision centrality and the mass
splitting of neutron and proton in nuclear medium play a significant role on
the distribution structure of the ratios, but does not change the influence of
symmetry energy on the spectrum.Comment: 5 figures, 13 page
Modeling Water Cluster Anions
A quantum Drude oscillator model was developed by our group to describe excess electrons interacting with water clusters1. This approach uses quantum Drude-oscillators to account for polarization and dispersion interactions between the excess electron and the water molecules. In the present work, the quantum Drude model£¬combined with a modified Thole-type water model with dipole point polarizability, denoted DPP, is used to investigate the (H2O)7- cluster. Several low-energy isomers were characterized, and the finite-temperature properties of the cluster was investigated by means of parallel tempering Monte Carlo simulations
- …