Recently we have suggested that the state of a single particle should be jointly defined by two wave functions.In this letter we use this suggestion to discuss the motion of a single particle in an infinitely deep squ...Recently we have suggested that the state of a single particle should be jointly defined by two wave functions.In this letter we use this suggestion to discuss the motion of a single particle in an infinitely deep square potential well;the results obiained in the classical limit correctly describe the motion of the single particle with clarity.展开更多
Besed on the symmetry properties of constrained Hamiltonian system,we present one other example to show that Dirac’s conjecture fails in a different way than other examples in that there is no linearization of constr...Besed on the symmetry properties of constrained Hamiltonian system,we present one other example to show that Dirac’s conjecture fails in a different way than other examples in that there is no linearization of constraint in this problem.A clear discussion is made on the relationships of the coefficients connecting with the first-class constraints in the gauge generator for a constrained Hamiltonian system.The results of this counterexample are also in contradiction with the other conclusions.展开更多
Percolation structures of precipitated new phases were observed in Au-Ti and Ni-A1 amorphous films upon ion irradiation.The experimental evidences showed that the observed structures were formed in the surface layer,c...Percolation structures of precipitated new phases were observed in Au-Ti and Ni-A1 amorphous films upon ion irradiation.The experimental evidences showed that the observed structures were formed in the surface layer,ca 20nm thick.It was revealed that the formation of percolation clusters was sensitive to alloy composition as well as irradiation dose.展开更多
The enhancement of adhesion between deposited metal layers(Ti and Cu)and the oxide substrates at RT and 300°c respectively was studied by argon ion irradiation to various doses.The experimental results showed tha...The enhancement of adhesion between deposited metal layers(Ti and Cu)and the oxide substrates at RT and 300°c respectively was studied by argon ion irradiation to various doses.The experimental results showed that the adhesive strength increased after a threshold dose irradiation and reached as aturation value at higher doses in all metal/oxide pairs.RBS spectra showed that chemical reaction had taken place in Ti/oxide case,while in Cu/oxide case,both RBS and XPS analysis showed that no evidence of such reaction had been induced.展开更多
Nuclear effect in nuclear Drell-Yan(DY)process is not clear as that in the European muon collaboration(EMC)effect,and many EMC effect models overestimate it.In this letter,the energy loss effect in nuclear DY process ...Nuclear effect in nuclear Drell-Yan(DY)process is not clear as that in the European muon collaboration(EMC)effect,and many EMC effect models overestimate it.In this letter,the energy loss effect in nuclear DY process is studied,and it is found that the nuclear DY ratio is suppressed due to the energy loss which balances the overestimate of the DY ratio in the EMC effect models.展开更多
The off-shell calculation is studied in the quark-gluon vertex with dimension-4 gluon condensate in the fixed-point gauge.It is noted that the evaluated result depends on whether the zero point is set on the fermionic...The off-shell calculation is studied in the quark-gluon vertex with dimension-4 gluon condensate in the fixed-point gauge.It is noted that the evaluated result depends on whether the zero point is set on the fermionic or gluonic line for the off-shell calculation in the quark-gluon vertex.In order to obtain more reasonable results,it is suggested that a covariant gauge should be adopted.展开更多
Results of resistivity,ac magnetic susceptibility,and Halleffect measurements for Ba_(1.2)Y_(0.9)V_(0.9)Cu_(3)0_(7-δ)are reported.The positive value of Hall constant indicates that the material conducts via holes wit...Results of resistivity,ac magnetic susceptibility,and Halleffect measurements for Ba_(1.2)Y_(0.9)V_(0.9)Cu_(3)0_(7-δ)are reported.The positive value of Hall constant indicates that the material conducts via holes with a carrier concentration of 1.6×10^(21)cm^(-3)at room temperature.A large anomaly in RH near Tc is observed.展开更多
The effect of the pump-noise on the statistical properties of the output photon-number is discussed.The master equation for the radiation field valid for any pump fluctuation with steady atomic injection is presented....The effect of the pump-noise on the statistical properties of the output photon-number is discussed.The master equation for the radiation field valid for any pump fluctuation with steady atomic injection is presented.Far above threshold,the characteristic function for the photon-number distribution is derived without truncating the master equation,the mean value and fluctuation of the output photon-number are also calculated.Thereby the condition of generating sub-Poissonian light is derived and the effect of the pump-noise on the higher-order moment of the output photon-number distribution is analyzed.展开更多
Experimental observation of laser cooling and collimation of moving atoms in an absorption cell by light pressure force of an intense standing light wave field is reported.The hyper fine structure of atomic sodium has...Experimental observation of laser cooling and collimation of moving atoms in an absorption cell by light pressure force of an intense standing light wave field is reported.The hyper fine structure of atomic sodium has been observed due to the cooled and collimated atoms.The mechanism of laser cooling and collimation of atoms is discussed.展开更多
A simple version of coupled channels approach is generalized to the light system ^(16)O+^(16,18)O for subbarrier fusion study.It shows that the contribution of the inelastic channel of 2_(1)^(+) state in ^(18)O is sma...A simple version of coupled channels approach is generalized to the light system ^(16)O+^(16,18)O for subbarrier fusion study.It shows that the contribution of the inelastic channel of 2_(1)^(+) state in ^(18)O is small,while neutron-pair transfer reaction channel of vanishing Q-value is required to explain the trend of the existing low-energy fusion data.展开更多
基金supported by Institute of Theoretical Physics,Academia Sinica.
文摘Recently we have suggested that the state of a single particle should be jointly defined by two wave functions.In this letter we use this suggestion to discuss the motion of a single particle in an infinitely deep square potential well;the results obiained in the classical limit correctly describe the motion of the single particle with clarity.
基金Supported by the National Natural Science Foundation of China under grant No.19275009Beijing Natural Science Foundation of China under grant No.91-A-010.
文摘Besed on the symmetry properties of constrained Hamiltonian system,we present one other example to show that Dirac’s conjecture fails in a different way than other examples in that there is no linearization of constraint in this problem.A clear discussion is made on the relationships of the coefficients connecting with the first-class constraints in the gauge generator for a constrained Hamiltonian system.The results of this counterexample are also in contradiction with the other conclusions.
基金Project supported in part by the National Science Foundation of China.
文摘Percolation structures of precipitated new phases were observed in Au-Ti and Ni-A1 amorphous films upon ion irradiation.The experimental evidences showed that the observed structures were formed in the surface layer,ca 20nm thick.It was revealed that the formation of percolation clusters was sensitive to alloy composition as well as irradiation dose.
基金Project supported by the National Science Foundation of China.
文摘The enhancement of adhesion between deposited metal layers(Ti and Cu)and the oxide substrates at RT and 300°c respectively was studied by argon ion irradiation to various doses.The experimental results showed that the adhesive strength increased after a threshold dose irradiation and reached as aturation value at higher doses in all metal/oxide pairs.RBS spectra showed that chemical reaction had taken place in Ti/oxide case,while in Cu/oxide case,both RBS and XPS analysis showed that no evidence of such reaction had been induced.
基金Supported by the National Natural Science Foundation of China under Grant No.19475047the Natural Science Foundation of Jiangsu Province,China.
文摘Nuclear effect in nuclear Drell-Yan(DY)process is not clear as that in the European muon collaboration(EMC)effect,and many EMC effect models overestimate it.In this letter,the energy loss effect in nuclear DY process is studied,and it is found that the nuclear DY ratio is suppressed due to the energy loss which balances the overestimate of the DY ratio in the EMC effect models.
基金Supported by the National Natural Science Foundation of China under Grant No.19475047,and the Natural Science Foundation of Jiangsu Province,China.
文摘The off-shell calculation is studied in the quark-gluon vertex with dimension-4 gluon condensate in the fixed-point gauge.It is noted that the evaluated result depends on whether the zero point is set on the fermionic or gluonic line for the off-shell calculation in the quark-gluon vertex.In order to obtain more reasonable results,it is suggested that a covariant gauge should be adopted.
文摘Results of resistivity,ac magnetic susceptibility,and Halleffect measurements for Ba_(1.2)Y_(0.9)V_(0.9)Cu_(3)0_(7-δ)are reported.The positive value of Hall constant indicates that the material conducts via holes with a carrier concentration of 1.6×10^(21)cm^(-3)at room temperature.A large anomaly in RH near Tc is observed.
基金Supported by the National Natural Science Foundation of China under Grant No.19675014。
文摘The effect of the pump-noise on the statistical properties of the output photon-number is discussed.The master equation for the radiation field valid for any pump fluctuation with steady atomic injection is presented.Far above threshold,the characteristic function for the photon-number distribution is derived without truncating the master equation,the mean value and fluctuation of the output photon-number are also calculated.Thereby the condition of generating sub-Poissonian light is derived and the effect of the pump-noise on the higher-order moment of the output photon-number distribution is analyzed.
基金Supported by the National Natural Science Foundation of China under Grant No.18974049.
文摘Experimental observation of laser cooling and collimation of moving atoms in an absorption cell by light pressure force of an intense standing light wave field is reported.The hyper fine structure of atomic sodium has been observed due to the cooled and collimated atoms.The mechanism of laser cooling and collimation of atoms is discussed.
基金Supported by the National Natural Science Foundation of China。
文摘A simple version of coupled channels approach is generalized to the light system ^(16)O+^(16,18)O for subbarrier fusion study.It shows that the contribution of the inelastic channel of 2_(1)^(+) state in ^(18)O is small,while neutron-pair transfer reaction channel of vanishing Q-value is required to explain the trend of the existing low-energy fusion data.
