Within the framework of a semiclassical Boltzmann-Uehling-Uhlenbeck （BUU） transport model, the high mo- mentum tail （HMT） effects of nucleon momentum distribution in the nucleus on the nucleon collective flows are...Within the framework of a semiclassical Boltzmann-Uehling-Uhlenbeck （BUU） transport model, the high mo- mentum tail （HMT） effects of nucleon momentum distribution in the nucleus on the nucleon collective flows are studied in semieentral Au＋Au collisions. The HMT due to the isospin-dependent short-range correlations causes a smaller value of the collective flows. We find that the HMT effects on the nucleon collective flows are remarkable at beam energy of 300 MeV/nucleon and become weak as the incident beam energy increases. The results indicate that for the collective flow studies at intermediate energies, the HMT of nucleon momentum distribution in nucleus should be taken into account in transport models.展开更多
The purpose of this articleis to address the presence of seven recomposed ricercari by Jacques Buus in the Music Manuscript 242 from the Library of the University of Coimbra in Portugal （P-Cug MM 242）. These recompo...The purpose of this articleis to address the presence of seven recomposed ricercari by Jacques Buus in the Music Manuscript 242 from the Library of the University of Coimbra in Portugal （P-Cug MM 242）. These recompositions, probably copied in the third quarter of the 16th century, were made after the previously copied Buus＇s ricercari in Music Manuscript 48 （P-Cug MM 48） of the same library, which were based on the Libro primo de ricercari a quattrovoci, published in Venice in 1547 by Antonio Gardane. In this paper, the author intend to focus in two main aspects of the research done on this subject. The first topic concerns the score-format of both manuscripts 48 ＆ 242, which testify the instrumental activity in mid-sixteenth century Portugal. The author will demonstrate that this format served once, in the Santa Cruz Monastery in Coimbra, as a didactic tool in the teaching of counterpoint through the music of a northern European master such as Jacques Buus. The copies in the manuscripts were never intended to be used as a performing support--they contain many errors of vertical coordination between the voices that make the performance impossible. The second topic focuses on Buus＇ recomposed ricercari, which were the object of many cuts, brief recomposed bridges, newly inserted sections, and written glosa figurations. Through these recompositions, the author will describe the theoretic assimilation of formal processes, of style, mode, counterpoint and performing practice. The achievement of this paper is to offer historic musicology researchers a new perspective about the enormous influence that Buus＇ ricercari from his Libro primo.., had in the learning processes of music composition and in the development of didactic and performing practices in the Santa Cruz Monastery in Coimbra, during the mid-sixteenth century.展开更多
Shear viscosity (η) is a basic transport coefficient of the medium.In this work,we calculate shear viscosity to entropy density ratio (η/S) of an equilibrated system in intermediate energy heavy ion collisions withi...Shear viscosity (η) is a basic transport coefficient of the medium.In this work,we calculate shear viscosity to entropy density ratio (η/S) of an equilibrated system in intermediate energy heavy ion collisions within the framework of the Boltzmann-Uehling-Uhlenbeck model (BUU) model.After the equilibration of Au + Au system at central collision in a fixed volume is reached,temperature,pressure and energy density are extracted by the phase space information and then η/S is calculated using the Green-Kubo formulas.The results show that η/S drops with the incident energy and its value is not so drastically different from the RHIC results.展开更多
The disappearance of collective flow for <sup>64</sup>Zn+<sup>58</sup>Ni collisions is studied withBUU equation.It is found that the balance energy,E<sub>bal</sub>,is very sensitive...The disappearance of collective flow for <sup>64</sup>Zn+<sup>58</sup>Ni collisions is studied withBUU equation.It is found that the balance energy,E<sub>bal</sub>,is very sensitive to the in-me-dium nucleon-nucleon cross section and increases with the impact parameter.展开更多
The excitation function and isospin dependencies ofσR have been investigated by using the Boltzmann-Uehling-Uhlenbeck(BUU)model with a square-type density distribution.When the width parameter of the square distribut...The excitation function and isospin dependencies ofσR have been investigated by using the Boltzmann-Uehling-Uhlenbeck(BUU)model with a square-type density distribution.When the width parameter of the square distribution is obtained by fittingσR at relativistic energies,the BUU-model can reproduce the experimental data at intermediate energies better than Glauber model.The systematical underestimation ofσR at intermediate energy by Glauber model was removed out now by BUU calculation framework.It is also found thatσR is sensitive to nuclear equation of state andσin-NN medium.The difference factor d defined in text is sensitive to the nuclear structure such as neutron halo and neutron skin,etc.展开更多
An improved microscopic model to calculate the initial exciton number has been developed on the basis of original microscopic model-so-called phase-space model.In our model the particle number p0 and hole number h0 ar...An improved microscopic model to calculate the initial exciton number has been developed on the basis of original microscopic model-so-called phase-space model.In our model the particle number p0 and hole number h0 are treated separately and the Vlasov or BUU dynamics is used during the nucleus-nucleus collision instead of simple dynamical process without friction.This model reproduces the experimental results rather well.展开更多
The relationship between the energy storage and the entrance channel dyna-mics(i.e.incident energy,impact parameter,and collision system)is studied by usingthe BUU model.The effects of the mass asymmetry of the entran...The relationship between the energy storage and the entrance channel dyna-mics(i.e.incident energy,impact parameter,and collision system)is studied by usingthe BUU model.The effects of the mass asymmetry of the entrance channel on theexcitation properties of the compound systems are specially discussed.展开更多
Antiproton-induced reactions on nuclei at the beam energies from hundreds Me V up to several Ge V provide an excellent opportunity to study interactions between the antiproton and secondary particles(mesons, baryons a...Antiproton-induced reactions on nuclei at the beam energies from hundreds Me V up to several Ge V provide an excellent opportunity to study interactions between the antiproton and secondary particles(mesons, baryons and antibaryons) with nucleons. The antiproton projectile is unique in the sense that most of the annihilation particles are relatively slow in the target nucleus frame. Hence, the prehadronic effects do not much influence their interactions with the nucleons of the nuclear residue. Moreover, the particles with momenta less than about 1 Ge V/c are sensitive to nuclear mean field potentials. This paper discusses the microscopic transport calculations of the antiproton-nucleus reactions and is focused on three related problems:(i) antiproton potential determination,(ii) possible formation of strongly bound antiproton-nucleus systems, and(iii) strangeness production.展开更多
基金Supported by the Fundamental Research Funds for the Central Universities under Grant No lzujbky-2014-170the Research Fund for the Doctoral Program of Higher Education of China under Grant No 20120211120002the National Natural Science Foundation of China under Grant Nos 11205075 and 11375076
文摘Within the framework of a semiclassical Boltzmann-Uehling-Uhlenbeck （BUU） transport model, the high mo- mentum tail （HMT） effects of nucleon momentum distribution in the nucleus on the nucleon collective flows are studied in semieentral Au＋Au collisions. The HMT due to the isospin-dependent short-range correlations causes a smaller value of the collective flows. We find that the HMT effects on the nucleon collective flows are remarkable at beam energy of 300 MeV/nucleon and become weak as the incident beam energy increases. The results indicate that for the collective flow studies at intermediate energies, the HMT of nucleon momentum distribution in nucleus should be taken into account in transport models.
文摘The purpose of this articleis to address the presence of seven recomposed ricercari by Jacques Buus in the Music Manuscript 242 from the Library of the University of Coimbra in Portugal （P-Cug MM 242）. These recompositions, probably copied in the third quarter of the 16th century, were made after the previously copied Buus＇s ricercari in Music Manuscript 48 （P-Cug MM 48） of the same library, which were based on the Libro primo de ricercari a quattrovoci, published in Venice in 1547 by Antonio Gardane. In this paper, the author intend to focus in two main aspects of the research done on this subject. The first topic concerns the score-format of both manuscripts 48 ＆ 242, which testify the instrumental activity in mid-sixteenth century Portugal. The author will demonstrate that this format served once, in the Santa Cruz Monastery in Coimbra, as a didactic tool in the teaching of counterpoint through the music of a northern European master such as Jacques Buus. The copies in the manuscripts were never intended to be used as a performing support--they contain many errors of vertical coordination between the voices that make the performance impossible. The second topic focuses on Buus＇ recomposed ricercari, which were the object of many cuts, brief recomposed bridges, newly inserted sections, and written glosa figurations. Through these recompositions, the author will describe the theoretic assimilation of formal processes, of style, mode, counterpoint and performing practice. The achievement of this paper is to offer historic musicology researchers a new perspective about the enormous influence that Buus＇ ricercari from his Libro primo.., had in the learning processes of music composition and in the development of didactic and performing practices in the Santa Cruz Monastery in Coimbra, during the mid-sixteenth century.
基金supported by the National Natural Science Foundation of China (No.11035009,10979074,10775168 and 10975174)Major State Basic Research Development Program in China (No.2007CB815004)+1 种基金Foundation for Developing Science and Technology in Shanghai (No. 09JC1416800)Knowledge Innovation Project of Chinese Academy ofSciences under (No. KJCX2-EW-N01)
文摘Shear viscosity (η) is a basic transport coefficient of the medium.In this work,we calculate shear viscosity to entropy density ratio (η/S) of an equilibrated system in intermediate energy heavy ion collisions within the framework of the Boltzmann-Uehling-Uhlenbeck model (BUU) model.After the equilibration of Au + Au system at central collision in a fixed volume is reached,temperature,pressure and energy density are extracted by the phase space information and then η/S is calculated using the Green-Kubo formulas.The results show that η/S drops with the incident energy and its value is not so drastically different from the RHIC results.
基金The project supported by the Science Foundation of Chinese Academy of Sciences
文摘The disappearance of collective flow for <sup>64</sup>Zn+<sup>58</sup>Ni collisions is studied withBUU equation.It is found that the balance energy,E<sub>bal</sub>,is very sensitive to the in-me-dium nucleon-nucleon cross section and increases with the impact parameter.
基金Supported by the National Natural Science Foundation of China for Distinguished Young Scholar under Grant No.19625513the National Natural Science Foundation of China under Grant No.19675059,the Major State Basic Research Development Program under Contract No.G200077400the Shanghai Science and Technology Development Fund under Grant No.96XD14011.
文摘The excitation function and isospin dependencies ofσR have been investigated by using the Boltzmann-Uehling-Uhlenbeck(BUU)model with a square-type density distribution.When the width parameter of the square distribution is obtained by fittingσR at relativistic energies,the BUU-model can reproduce the experimental data at intermediate energies better than Glauber model.The systematical underestimation ofσR at intermediate energy by Glauber model was removed out now by BUU calculation framework.It is also found thatσR is sensitive to nuclear equation of state andσin-NN medium.The difference factor d defined in text is sensitive to the nuclear structure such as neutron halo and neutron skin,etc.
文摘An improved microscopic model to calculate the initial exciton number has been developed on the basis of original microscopic model-so-called phase-space model.In our model the particle number p0 and hole number h0 are treated separately and the Vlasov or BUU dynamics is used during the nucleus-nucleus collision instead of simple dynamical process without friction.This model reproduces the experimental results rather well.
基金The project supported by National Natural Science Foundation of ChinaLWTZ-1298 of Academia Sinica.
文摘The relationship between the energy storage and the entrance channel dyna-mics(i.e.incident energy,impact parameter,and collision system)is studied by usingthe BUU model.The effects of the mass asymmetry of the entrance channel on theexcitation properties of the compound systems are specially discussed.
基金Supported by HIC for FAIR within the framework of the LOEWE program
文摘Antiproton-induced reactions on nuclei at the beam energies from hundreds Me V up to several Ge V provide an excellent opportunity to study interactions between the antiproton and secondary particles(mesons, baryons and antibaryons) with nucleons. The antiproton projectile is unique in the sense that most of the annihilation particles are relatively slow in the target nucleus frame. Hence, the prehadronic effects do not much influence their interactions with the nucleons of the nuclear residue. Moreover, the particles with momenta less than about 1 Ge V/c are sensitive to nuclear mean field potentials. This paper discusses the microscopic transport calculations of the antiproton-nucleus reactions and is focused on three related problems:(i) antiproton potential determination,(ii) possible formation of strongly bound antiproton-nucleus systems, and(iii) strangeness production.
