Entrance channel mass asymmetry dependence of compound nucleus formation
ABSTRACT 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.
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ABSTRACT: Several large-scale scientific facilities (LSSF) are running and several others are under construction in China. Recent progress made by Chinese scientists in theoretical study of nuclear physics related to these facilities is reviewed. The emphasis is put on those topics covered in the issue entitled “Special Topics on Some Theoretical Nuclear Physics Aspects Related to Large-scale Scientific Facilities” (in Sci China Ser G-Phys Mech Astron, Vol. 52, No. 10, 2009).Chinese Science Bulletin 56(35). · 1.37 Impact Factor
Article: Models of interacting dark energy[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. · 5.52 Impact Factor
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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 43(1):67-71. · 2.04 Impact Factor