共查询到20条相似文献,搜索用时 500 毫秒
1.
XU De-Zhi 《中国物理C(英文版)》1983,7(5):546-549
A subquark model is proposed. According to this model, stratons and leptons are consisted of rishons T and V, which are multiplets of group SUH(3)×SUC(3)×SUG(2)×SU(2)×U(1). Three generations of both stratons and leptons are obtained naturally. In this model, proton decay modes are μ-e+e+ or e-μ+μ+. 相似文献
2.
GOLDBERGER-TREIMAN RELATION AND NUCLEON'S MEAN SQUARE RADIUS OF STRONG INTERACTION IN THE SKYRME MODEL
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LI Bing-An 《中国物理C(英文版)》1987,11(3):426-429
In this letter it is shown that even in mπ≠0 case the Goldberger-Treiman relation is still hold in the Skyrme model. The mean square radius of strong interaction of nucleon <r2>s1/2 is computed in the Skyrme model. 相似文献
3.
DONG Yu-Bing 《中国物理C(英文版)》2001,25(8):720-724
Based on the quark model, the Q2 evolution of the nucleon spin structure functions in the small Q2 region is calculated. The higher-twist effects a2(Q2) and d2(Q2) are investigated. Comparison with other model calculations is also proceeded. 相似文献
4.
The E2 reduced transition probabilities between the d-a cluster states of 6Li were calculated by the RGM in this paper.The resulting B(E2;E1→E0)=21.06fm4 consistented with the experimental value 25.1±2.0fm4 more than the calculated values of the double-well cluster model including p-state exciting and LCCO.Also,the B(E2;E3→E0)=9.67fm4 coincided with the exprimental value 6.483±3.360fm4 within the error range. 相似文献
5.
High-spin states in odd-odd nuclei of 176,178Ir and 182Au have been studied experimentally using heavy-ion- induced fusion-evaporation reactions and standard in-beam γ-ray spectroscopic techniques. Rotational bands built on the πi13/2 νi13/2 configuration have been observed. In addition, on the basis of level spacing systematics, spin assignments have been proposed for the πi13/2 νi13/2 band in 184 Au,which was reported without spin assignments in previous study. It is pointed out that the πi13/2 νi13/2 bands in 176,178Ir and 182,184Au present a low-spin signature inversion. In the theoretical framework of 2-quasiparticle plus rotor model with p- n residual interaction, the signature inversion phenomenon in the πi13/2 νi13/2 bands has been discussed qualitatively. Theoretical investigations have been performed for the πh9/2 νi13/2 and πi13/2 νi13/2 bands using the cranked shell model. It is found that the signature inversions in both configurations can be well reproduced using the pairing and deformation self-consistent cranked Wood-Saxon calculations. 相似文献
6.
A single band t-U-J1-J2 model is proposed as the minimum model to describe the superconductivity of the newly discovered iron-based superconductorsR(O1-xFx)FeAs and RO1-xFeAs (R=La, Ce, Sm, Pr, Nd, Gd). With the mean-field approach, it is found that the pairing occurs in the d-wave channel. In the likely parameter region of the real materials, by lowering temperature, the system enters firstly the dxy superconducting phase with D4h-symmetryand then enters the time-reversal-symmetry-broken dxy+idx2-y2 superconducting phase with C4h-symmetry. 相似文献
7.
LI Bing-An 《中国物理C(英文版)》1984,8(3):279-284
In this paper the MIT bag model and wave Packet Method are used to calculate the width of the process π0→2γ It is found that mπ→0 is a good approximation. The results are consistent with PCAC. The theoretical value of Γ(π0→2γ) is 2.7 times of the experimental value. The deviation is mainly from the calculation of Fπ. It is also found that the deviation strongly depends on the equation and the boundary contion of the MIT bag model. 相似文献
8.
YU SHOU-MIEN 《中国物理C(英文版)》1982,6(1):36-43
A relativistic equation of motion of a two particle system under the constraints pi2-mi2-U(x2)=0.(i=1,2), where U(x2) is an infinite spherical square well poten-tial, is applied to the SU(4) quark model of mesons. A set of linear mass relations areobtained. Instead of the linear relation between J and M2, the Regge trajectory ob-tained is a relation between pnl2 and M2, where ζnlπ are zeros of the spherical Besselfunctions. The new trajectory seems more satisfactory than the former one. 相似文献
9.
In this paper the forms of the gluon distribution function at different Q2 are discussed with the aid of the three-quarks model associated with dynamical calculations of QCD (the LLA approximation). The Buras-Gaemers parametrization is improved and the gluon distribution functions are obtained. It can be described by a simple parameter form: xG(x, Q2)=xG1(x, Q2)+xG2(x, Q2)=[1+B(s)]1(Q2)>2(1-x)[B(s)]+[1+D(s)]2)>(1-x)D(s), The form satisfies the QCD evolution equations and does not contradict evidently with existing experimental data. Then the properties of the constituent gluons in a nucleon are analyzed on these basis and it is indicated that the gluon distribution function could be considered as to be made of two different parts-soft and hard parts. 相似文献
10.
11.
S. L. Yuan Z. J. Yang J. Q. Li K. Kadowaki 《Applied Physics A: Materials Science & Processing》1995,62(1):73-76
The c-axis resistivity, Ac(T,rH,r/), of La1.86 Sr0.14CuO4 is experimentally studied as a function of temperature T, magnetic field H and angle / between H and ab-plane. It is argued that the experimental findings cannot be accounted for by previously considered mechanisms. By contrast, they can be explained by a phenomenological model, which is developed by replacing H in the dissipation model for HÁIÁc with the reduced field h=H(sin2/+cos2//%2)1/2, where % is the anisotropic parameter in magnetic fields. Based on this phenomenological model, it is shown that all the measured Ac(T,rH,r/) curves could consistently map onto a single curve. 相似文献
12.
13.
Phenomenological Scaling of Rapidity Dependence for Anisotropic Flows in 25 MeV/nucleon Ca+Ca by Quantum Molecular Dynamics Model
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Anisotropic flows (v1, v2, v3 and v4) of light fragments up to the mass number 4 as a function of rapidity are studied for 25 MeV/nucleon ^40Ca + ^40Ca at large impact parameters by a quantum molecular dynamics model. A phenomenological scaling behaviour of rapidity dependent flow parameters vn (n = 1, 2, 3 and 4) is found as a function of mass number plus a constant term, which may arise from the interplay of collective and random motions. In addition, v4/v2^2 keeps to be almost independent of rapidity and remains a rough constant of 1/2 for all light fragments. 相似文献
14.
Impact parameter dependence of the scaling of anisotropic flowsin intermediate energy heavy-ion collisions
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The scaling behaviors of anisotropic flows of light charged particles are studied for 25 MeV/u 40Ca+40Ca collisions at different impact parameters by the isospin-dependent quantum molecular dynamics model. The nucleon-number scaling of elliptic flow exists and the scaling of the ratios of v4/v22 and v3/(v1v2) is applicable to collisions at almost all impact parameters except for peripheral collisions. 相似文献
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16.
BES Collaboration 《中国物理C(英文版)》1993,17(2):97-106
Based on the 2.5 million J/ψ's collected by the BES at BEPC,through the hadronic decay J/ψ→ωf2(1270),f2(1270)→π+π-,ω→π+π-π0,the properties of the resonance f2(1270) are studied:its mass,width,and branching ratio.the angular distribution is fitted with maximum likelihood methood,determining its.JPC=2++ and giving in the first time the helicity amplitude ratios of this process as:x=0.99±0.29; y=-0.24±0.17; z1=0.90±0.57;z2=0.56±0.22. 相似文献
17.
A chiral quark model is applied to calculate the spectra of pseudoscalar mesons η and η'. By analyzing the obtained spectra, we find that the mesons η'(21S0), η(41S0), η'(31S0) and η'(41S0) are the possible candidates of η(1760), X(1835), X(2120) and X(2370). The strong decay widths of these pseudoscalars to all the possible two-body decay channels are calculated within the framework of the 3P0 model. Although the total width of η'(21S0) is compatible with the BES Collaboration's experimental value for η(1760), the partial decay width to ωω is too small, which is not consistent with the BES result. If X(1835) is interpreted as η(41S0), the total decay width is compatible with the experimental data, and the main decay modes will be mπ a0(980) and m π a0(1450), which needs to be checked experimentally. The assignment of X(2120) and X(2370) to η'(31S0) and η'(41S0) is disfavored in the present calculation because of the incompatibility of the decay widths. 相似文献
18.
Mixing between the 23S1 and 13D1 Ds is studied within the 3P0 model. If mixing between these two 1- states exists, Ds1*(2700)± and DsJ*(2860)± could be interpreted as the two orthogonal mixed states with mixing angle θ≈ -80° in the case of a special β for each meson. However, in the case of a universal β for all mesons, Ds1*(2700)± could be interpreted as the mixed state of 23S1 and 13D1 with mixing angle 12° < θ < 21° but DsJ*(2860)± seems difficult to interpret as the orthogonal partner of Ds1*(2700)±. 相似文献
19.
ZHU ShengJiang GAN CuiYun ZHU LingYan YANG LiMing XU RuiQing JON MyonGil JIANG Zhuo ZHANG Zheng 《中国物理C(英文版)》2000,24(11):1018-1023
Through study of the prompt r-rays emitted in the spontaneous fission of 252Cf, high spin states of neutron-rich odd-A 145,147Ce nuclei have been investigated. The levels in 147Ce have been extended. A collective band in 145Ce have been identified for the first time. The results from the particle rotor model calculations indicate that the yrast bands in 145Ce and 147Ce originate from vi13/2 orbital coupling and the ground states of 145Ce and 147Ce originate from (vh9/2,vf7/2) and vh9/2 configiration, respectively. No obvious octupole deformation was observed in these two isotopes, but a side band obtained in 147Ce may show some octupole correlations. 相似文献
20.
Using the HFB cranking model, the RAL effect of g9/2 proton pair and neutron pair for three forking phenomenon in 68Ge is studied. Calculations show that two backbending of three forking in 68Ge are mainly caused by rotation alignment of g9/2 proton pair and neutron pair. 相似文献