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2007年05月31日

【期刊论文】Isoscaling behavior in fission dynamics

马余刚， Y. G. Ma， K.Wang，， X. Z. Cai， J. G. Chen， J. H. Chen， D. Q. Fang， W. Guo， C.W. Ma， G. L. Ma， W. Q. Shen， Q. M. Su， W. D. Tian， Y. B. Wei， T. Z. Yan， C. Zhong， X. F. Zhou， J. X. Zuo

PHYSICAL REVIEW C 72, 064603 (2005)，-0001，（）：

-1年11月30日

摘要

The fission processes of 112Sn+112Sn and 116Sn+116Sn are simulated with the combination of the Langevin equation and the statistical decay model. The masses of two fission fragments are given by assuming the process of symmetric fission or asymmetric fission by Monte Carlo sampling with the Gaussian probability distribution. From the analysis of the isotopic/isotonic ratios of the fission fragments from both reactions, the isoscaling behavior has been observed and investigated in detail. Isoscaling parameters α and β are extracted as a function of the charge number and neutron number, respectively, in different widths of the sampling Gaussian probability distribution. It seems that α is sensitive to the width of fission probability distribution of the mass asymmetrical parameter, but β is not. Both α and β drop with increasing beam energy and reduced friction parameter.

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2007年05月31日

【期刊论文】Surveying the nucleon-nucleon momentum correlation function in the framework of quantum molecular dynamics model

马余刚， Y. G. Ma， Y. B. Wei， W. Q. Shen， X. Z. Cai， J. G. Chen， J. H. Chen， D. Q. Fang， W. Guo， C. W. Ma， G. L. Ma， Q. M. Su， W. D. Tian， K. Wang， T. Z. Yan， C. Zhong， and J. X. Zuo

PHYSICAL REVIEW C 73, 014604 (2004)，-0001，（）：

-1年11月30日

摘要

Momentum correlation functions of nucleon-nucleon pairs are presented for reactions with C isotopes bombarding a 12C target within the framework of the isospin-dependent quantum molecular dynamics model. The binding-energy dependence of the momentum correlation functions is also explored, and other factors that have an influence on momentum correlation functions are investigated. These factors include momentum-dependent nuclear equations of state, in-medium nucleon-nucleon cross sections, impact parameters, total pair momenta, and beam energy. In particular, the rise and the fall of the strength of momentum correlation functions at lower relative momentum are shown with an increase in beam energy.

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2007年05月31日

【期刊论文】A novel path to study the total reaction cross sections

马余刚， Y. G. Ma，， W. Q. Shen， J. Feng， Y. Q. Ma

Physics Letters B 302 (1993) 386-389，-0001，（）：

-1年11月30日

摘要

New calculations for the total reaction cross sections (σR) have been carried out within the framework of reaction dynamics in the intermediate energy nucleus-nucleus collision. The σR of both the stable and exotic nuclei were reproduced rather well. In addition, some dynamical effects on σR can be easily analyzed. The calculations reflected that σR was sensitive to the nuclear equation of state below 100 MeV/u and to the in-medium nucleon-nucleon cross section at the full energy range addressed.

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2007年05月31日

【期刊论文】Surveying the nuclear caloric curve

马余刚， Y. -G. Ma， A. Siwek， J. Péter， F. Gulminelli， R. Dayras， L. Nalpas， B. Tamain， E. Vient， G. Auger， Ch. O. Bacri， J. Benlliure， E. Bisquer， B. Borderie， R. Bougault， R. Brou， J. L. Charvet， A. Chbihi， J. Colin， D. Cussol， E. De Filippo， A. Demeyer， D. Doré， D. Durand， P. Ecomard， P. Eudes， E. Gerlic， D. Gourio， D. Guinet， R. Laforest， P. Lautesse， J. L. Laville， L. Lebreton， J. F. Lecolley， A. Le Fèvre， T. Lefort， R. Legrain， O. Lopez， M. Louvel， J. Łukasik， N. Marie， V. Métivier， A. Ouatizerga， M. Parlog， E. Plagnol， A. Rahmani， T. Reposeur， M. F. Rive

Physics Letters B 390 (1997) 41-48，-0001，（）：

-1年11月30日

摘要

The 4π array INDRA was used to detect nearly all charged products emitted in Ar + Ni collisions between 52 and 95 MeV/u. The charge, mass and excitation energy E* of the quasi-projectiles have been reconstructed event by event. Excitation energies up to 25 MeV per nucleon are reached. Apparent temperatures obtained from several double isotopic yield ratios Tr0 show different dependences uponE* . T06Li7Li-3Heα yields the highest values, as well as the high energy slopes Ts of the kinetic energy spectra. Two statistical models, sequential evaporation and gas in complete equilibrium, taking into account side feeding and discrete excited states population, show that the data can be explained by a steady increase of the initial temperature with excitation energy without evidence for a liquid-gas phase transition.

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2007年05月31日

【期刊论文】Rotational behavior in intermediate energy heavy ion collisions

马余刚， Y. G. Ma， W. Q. Shen， J. Feng， Y. Q. Ma

PHYSICAL REVIEW C VOLUME 48, NUMBER 4 OCTOBER 1993，-0001，（）：

-1年11月30日

摘要

The rotational behavior together with in-plane collective flow for the intermediate energy 40Ar+27Al reaction is investigated by analyzing the rapidity-dependent azimuthal distributions with the Boltzmann-Uehling-Uhlenbeck (BUU) model. The azimuthal distributions are fitted by a Legendre polynomial expansion up to the second order. By incorporating the uncertainties in the experimental reaction plane determination into our calculations, quantitative agreement between the calculations and data is obtained. It is found that the rotational behavior at midrapidity depends strongly on the impact parameter. Information about the in-plane collective flow is also extracted from the azimuthal distributions. Both the rotational behavior and the in-plane collective flow depend strongly on the in-medium nucleon-nucleon cross section and nuclear equation of state.

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