The Key Laboratory of Beam Technology and Material Modification of Ministry of Education, College of Nuclear Science and Technology, Beijing Normal University, Beijing 100875, China
Physics Letters B (Impact Factor: 6.13). 07/2008; 665(4):314-317. DOI: 10.1016/j.physletb.2008.06.006
The fusion reactions 48Ca + 154Sm and 16O + 186W leading to the same compound nucleus 202Pb are studied within the framework of an improved isospin dependent quantum molecular dynamics model. The entrance channel mass asymmetry dependence of compound nucleus formation is found by analyzing the shell correction energies, Coulomb barriers and fusion cross sections. The calculated fusion cross sections agree quantitatively with the experimental data. We conclude that the compound nucleus formation is favorable for the system with larger mass asymmetry.
[Show abstract][Hide abstract] ABSTRACT: We investigate the interaction between dark energy and dark matter using a phenomenological model with an interaction proportional to the dark energy density and two physically motivated models, interacting holographic dark energy and mass varying neutrino dark energy. Constraints on the interaction parameters are obtained using observational data including the gold type Ia supernovae set, the cosmic microwave background (CMB) shift parameter from the 3-yr Wilkinson Microwave Anisotropy Probe, the baryon acoustic oscillation parameter A from the Sloan Digital Sky Survey and the time-dependent observables of the lookback time to high-redshift galactic clusters. We find that the available data can be satisfied reasonably well for a wide range of parameters in the models studied and that the CMB parameter appears to have the most discriminating power between the models.
Monthly Notices of the Royal Astronomical Society 11/2008; 390(4):1719 - 1726. DOI:10.1111/j.1365-2966.2008.13863.x · 5.11 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: Based on the improved isospin dependent molecular dynamics model in which the shell correction energy of the system is calculated by using deformed two-center shell model and the surface energy of the system is improved by introducing a switch function that combines the surface energies of projectile and target with the one of the compound nucleus. The effects of the shell correction energy on synthesis of superheavy nuclei and the fusion cross sections in asymmetric and nearly symmetric reaction systems leading to the same compound nuclei 62Zn, 76Kr, and 202Pb are studied. The entrance channel mass asymmetry dependence of compound nucleus formation is found by analyzing the shell correction energies, Coulomb barriers and fusion cross sections. The experimental data are described quantitatively by the present model. It is found that the compound nucleus formation is favorable for the systems with larger mass asymmetry.
International Journal of Modern Physics E 12/2008; 17:80-96. DOI:10.1142/S021830130801177X · 1.34 Impact Factor
[Show abstract][Hide abstract] ABSTRACT: The fusion reactions are studied in the central collisions 82Se+ + 134Ba and 82Se+ + 138Ba by the improved isospin-dependent quantum molecular-dynamics model, where the nucleus 138Ba has a closed neutron shell N = 82 . Comparing the shell correction energies and fusion probabilities of these two reactions with the ones of other asymmetric
or more symmetric reaction systems that form the same compound nuclei, we find the dependence of the fusion reaction on the
nuclear shell structure of the colliding nuclei. The experimental data of the fusion probabilities are described well by the
present model. The result suggests that the neutron shell closure N = 82 promotes fusion.
European Physical Journal A 01/2009; 43(1):67-71. DOI:10.1140/epja/i2009-10889-y · 2.74 Impact Factor
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