作者：
Deng Kaiming;Yang Jinlong;Xiao Chuanyun;Wang Kelin
期刊：
JOURNAL OF PHYSICS-CONDENSED MATTER,1997年9(23):4925- ISSN：0953-8984
作者机构：
International Centre For Material Physics, Academia Sinica, Shenyang 110015, People's Republic of China;Department of Applied Physics, Nanjing University of Science and Technology, Nanjing, Jiangsu 210014, People's Republic of China;Centre for Fundamental Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China;Department of Physics, Central China Normal University, Wuhan, Hubei 430070, People's Republic of China
摘要：
The magnetic properties of icosahedral clusters are studied using the discrete-variational local-spin-density-functional method, where M = V, Cr, Mn, Fe, Co, and Ni. The results show that all of the clusters, just like the case for the cluster, have double magnetic solutions. In contrast to the moment of for the cluster, the total magnetic moments of the clusters, ranging from to , have been changed greatly by the substitution of the central Ru atom with M. Among them, the cluster has a giant moment of . Furthermore, the cluster has nondegenerate ground state and could be expected to be remarkably stable. Therefore, for the purpose of enhancing the magnetic moment of the cluster, Ni is a promising candidate as a dopant. Finally, we predict that all the clusters except might belong to the class in which the magnetization of the cluster increases with temperature.
摘要：
The spectrum structure of Ge isotopes was studied in the framework of a microscopic neutron-proton interacting boson model with two quasiparticle states. The approach started from shell model configurations and nucleon-nucleon effective interactions. Bands built upon both neutron and proton (g<inf>9/2</inf>)<sup>2</sup> configurations were considered. In the calculation of Ge isotopes, the single-particle energies for the open shells and strengths of the nucleon-nucleon effective interactions were employed. Fairly good agreement is obtained between experimental observations and theoretical results.
期刊：
EUROPEAN PHYSICAL JOURNAL A,1997年359(3):277-290 ISSN：1434-6001
通讯作者：
Adamovich, MI
作者机构：
ACAD SINICA, INST HIGH ENERGY PHYS, BEIJING, PEOPLES R CHINA.;INST GRAVITAT & SPACE RES, BUCHAREST, ROMANIA.;PANJAB UNIV, DEPT PHYS, CHANDIGARH 160014, INDIA.;HUNAN EDUC INST, DEPT PHYS, CHANGSHA, HUNAN, PEOPLES R CHINA.;JOINT NUCL RES INST, LAB COMP TECHN, DUBNA, RUSSIA.
通讯机构：
[Adamovich, MI] I;INST HIGH ENERGY PHYS, Alma Ata, KAZAKHSTAN.
摘要：
Recent results from the EMU-01/12 collaboration are presented for 10.7 GeV/nucleon gold nuclei interactions in emulsion. The distributions of ''bound'' charge (Z(bound;)Z(b3)), multiplicity distributions, fragment correlations and fluctuations are discussed. The data are compared to similar results obtained on the ALADIN setup at 600 MeV/nucleon. It is shown that multifragmentation of gold nuclei at high and intermediate energies has common features. It is also obtained that the IMFs have reduced multiplicity at high energies. The data are analyzed within the scope of the statistical model of multifragmentation. This model requires the following predetermined model ingredients: mass, charge and excitation energy of nuclear residuals. The simple estimation method of these characteristics is proposed in the framework of the Glauber approach. It is shown that the multifragmentation model reproduces qualitatively the present data. A dramatic discrepancy between the predicted and experimental yield of two charged fragments is found. The evolution of transverse momentum of fragments as a function of Z(bound) is presented. It is shown that the model greatly underpredicts the transverse momentum of fragments. It is interpreted as evidence of a strong radial flow of spectator fragments.
期刊：
Monthly Notices of the Royal Astronomical Society,1997年288(4):965-972 ISSN：0035-8711
通讯作者：
Yang, LT
作者机构：
HUAZHONG NORMAL UNIV,DEPT PHYS,WUHAN 430070,PEOPLES R CHINA.;HUAZHONG NORMAL UNIV,INST ASTROPHYS,WUHAN 430070,PEOPLES R CHINA.;[Yang, LT] MAX PLANCK SOC,RES UNIT DUST STAR FORMING REG,SCHILLERGASSCHEN 3,D-07745 JENA,GERMANY.
通讯机构：
[Yang, LT] M;MAX PLANCK SOC,RES UNIT DUST STAR FORMING REG,SCHILLERGASSCHEN 3,D-07745 JENA,GERMANY.
摘要：
The scaled factorial moments in QGP phase transitions are studied analytically by the extended Ginzburg-Landau model. The dependence of lnF(q) on phase space interval is different for the first-and second-order QGP phase transitions. When lnF(q) are fitted to polynomials of X drop delta(1/3), the relative sign between the fitted coefficients of X and b(q,1) calculated theoretically can be used to judge the order of phase transitions. Two sets of experimental data are reanalysed and the phase transitions are the first order for one set of data I,ut the second order for another.
期刊：
EUROPEAN PHYSICAL JOURNAL C,1997年73(3):535-539 ISSN：1434-6044
通讯作者：
Liu, LS
作者机构：
[Liu, LS; Zhang, Y; Deng, Y] Institute of Particle Physics, Hua-Zhong Normal University, Wuhan, People’s Republic of China
通讯机构：
[Liu, LS] H;HUA ZHONG NORMAL UNIV,INST PARTICLE PHYS,WUHAN 430070,PEOPLES R CHINA.
摘要：
The experimental results on the falling down of scaled factorial moments in azimuthal variable phi is studied in some detail. It is shown that this phenomenon may be referred to the influence of transverse momentum conservation. The existing experimental data from DELPHI, EMU08, NA22 and UA1 are successfully explained. Various methods are proposed to partly eliminate this influence and rule out the 'falling down' of factorial moments.
摘要：
The constraint structure of the induced 2D-gravity with the Weyl and area-preserving diffeomorphism invariances is analysed in the ADM formulation. It is found that when the area-preserving diffeomorphism constraints are kept, the usual conformal gauge does not exist, whereas there is the possibility to choose the so-called “quasi-light-cone” gauge, in which besides the area-preserving diffeomorphism invariance, the reduced Lagrangian also possesses the SL(2, R) residual symmetry. This observation indicates that the claimed correspondence between the SL(2, R) residual symmetry and the area-preserving diffeomorphism invariance in both regularisation approaches does not hold. The string-like approach is then applied to quantise this model, but a fictitious non-zero central charge in the Virasoro algebra appears. When a set of gauge-independent SL(2, R) current-like fields is introduced instead of the string-like variables, a consistent quantum theory is obtained, which means that the area-preserving diffeomorphism invariance can be maintained at the quantum level.
