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Volume 13 Issue 5
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Original Articles
On the Basis of Taiji Relativity
AI Xiao-bai
Chin. Phys. Lett. 1996, 13 (5): 321-324 .  
Abstract   PDF(pc) (197KB) ( 534 )
In this letter author argues that the taiji relativity, which recently developed by Hsu et al. [Phys. Lett. A 196 ( 1994 ) 1], can not be founded only upon Einstein’s first postulate, the principle of relativity. In fact it is still based on two postulates of special relativity.
Spectral Dimension of a Modified Checker Board Fractal Lattice
CHEN Shu, YANG Zhan-ru,
Chin. Phys. Lett. 1996, 13 (5): 325-328 .  
Abstract   PDF(pc) (188KB) ( 381 )
We present a kind of modified checker board lattice and investigate the random walk on the fractal . The spectral dimension is determined via renormalization procedures and the inverse matrix method is used to renormalize the master equation describing the random walk.
Quantum Signature of Classical Chaos in a Lipkin Model: Sensitivity of Eigenfunctions to Parameter Perturbations
XIE Rui-hua, XU Gong-ou, ,
Chin. Phys. Lett. 1996, 13 (5): 329-332 .  
Abstract   PDF(pc) (192KB) ( 351 )
In this paper, we have studied the properties of eigenfunctions in a three-level Lipkin model whose classical counterpart can exhibit classical chaos. In the regime of classical chaotic motions, sensitivity of eigenfunctions to parameter perturbation is exposed, which may be taken as a quantum signature of classical chaos.
Controlling Chaos and Bifurcation by a Delayed Nonlinear Feedback
YANG Shi-ping, TIAN Gang, XU Shu-shan
Chin. Phys. Lett. 1996, 13 (5): 333-336 .  
Abstract   PDF(pc) (188KB) ( 441 )
A method for stabilizing unstable periodic orbits ( UPO) embedded in a chaotic attractor is presented. The conditions for controlling chaos and bifurcation through feeding back a delayed discrete variable are analyzed. The feedback procedure is applicable without knowing a priori the location and the periodicity of the UPO. Our method can be applied not only to the chaotic attractor but also to the situation of bifurcation.
Variational Calculation of Lattice SU( N) Gauge System
ZHENG Xi-te, Shahram Alaviad
Chin. Phys. Lett. 1996, 13 (5): 337-339 .  
Abstract   PDF(pc) (123KB) ( 377 )
A general method for an analytical calculation of SU( N) lattice gauge theories with finite N ≥ 3 is developed. As an example, the order parameter < E > of lattice SU (4) gauge system is calculated. The result is in good agreement with Monte Carlo simulations.
Quantum Chromodynamics Sum Rules for the 1- + Vector Odd-Glueball
LU Wen-tao, LIU Jue-ping
Chin. Phys. Lett. 1996, 13 (5): 340-342 .  
Abstract   PDF(pc) (142KB) ( 401 )
The transverse part of the two-point function of the 1- + vector gluonic current is calculated by including the perturbative contributions and the non-perturbative ones resulted from condensates of dimensions up to six. In a usual “resonance plus continuum” model of the spectral function, the quantum chromodynamics sum rules for the 1- + vector odd-glueball are derived, and the mass of that glueball is determined to be 1.87 GeV.
On the A -Dependence of the Okamoto-Nolen-Schiffer Anomaly
SHEN Hong, NING Ping-zhi, CAI Chong-hai, WANG Hong-yu
Chin. Phys. Lett. 1996, 13 (5): 343-346 .  
Abstract   PDF(pc) (181KB) ( 453 )
A new version of the in-medium quark condensate is applied to study the Okamoto-Nolen-Schifferanomaly. The results show that the theoretical mass difference of mirror nuclei due to the neutron-proton mass difference have the right magnitude needed to explain this anomaly, and vary slowly with nuclear mass number A.
Concept of Excessive Mesons in Nuclei
WU Shi-shu, YAO Yu-jie
Chin. Phys. Lett. 1996, 13 (5): 347-350 .  
Abstract   PDF(pc) (224KB) ( 400 )
The concept of excessive mesons in nuclei is discussed. Since nucleons are identical particles, it is pointed out that the physical content of a meson distribution around a bound nucleon in nuclei is different from that of a meson cloud around a free nucleon. if the effect of the principle of identity cannot be neglected. The difference is enunciated in detail.
Polarization of Λ’s Produced in S + Pb Collisions at 200GeV/c per Nucleon
YE Yun-xiu, SU Shu-fang, JI Gang
Chin. Phys. Lett. 1996, 13 (5): 351-354 .  
Abstract   PDF(pc) (219KB) ( 429 )
The Λ0 polarization is analyzed with the experimental data in S + Pb collisions at energy 200 GeV per nucleon, which were produced at SPS of CERN The small polarization value and the correlation between the transverse polarization and transverse momentum were obtained in Feynman parameter xF > 0, xF < 0 and all xF. The results show that the non-polarization of lambda appears in the region of larger transverse momenta, say, at 1 - 2 GeV/c in PT. The origins of polarization reduction are discussed.

Variability of Multiphoton Detachment Rate Versus Laser Intensity
WANG Bing-bing, ZHU Qi-ren, PAN Shou-fu
Chin. Phys. Lett. 1996, 13 (5): 355-358 .  
Abstract   PDF(pc) (212KB) ( 438 )
With the help of a model calculation based on the R-matrix- Floquet theory, the variability of multiphoton detachment rate versus laser intensity is in detail investigated. A number of interesting regularities, which can not be understood in the lowest order perturbation theory, is found out and interpreted.

Periodical Oscillations of Supercurrent Fluctuation in Mesoscopic Josephson Junctions in Quantized Electromagnetic Fields
KUANG Le-man, WANG Yi-wen, GE Mo-lin
Chin. Phys. Lett. 1996, 13 (5): 359-361 .  
Abstract   PDF(pc) (153KB) ( 451 )
Supercurrent fluctuation of a mesoscopic Josephson junction ( MJJ ) in the pre-sence of a dc static voltage and a time-varying quantized electromagnetic field ( QEMF) is investigated. It is shown that the fluctuation of supercurrent in the MJJ exhibits periodical oscillations with a periodicity which depends upon the rate of the classical static external voltage and the frequency of the QEMF.
Direct Observation of Domain-Inverted Regions in Proton-Exchanged LiNbO3 Using Transmission Electron Microscopy
ZHANG Zhi-yong, WANG Lu-chun, ZHU Yong-yuan, ZHU Shi-ning, MIN Nai-ben (Nai-ben Ming)
Chin. Phys. Lett. 1996, 13 (5): 362-365 .  
Abstract   PDF(pc) (307KB) ( 419 )
Direct observation of the domain-inverted regions in LiNbO3 formed by proton exchange followed by heat treatment is performed by using transmission electron microscopy. A charged straight 180°twinning domain boundary was revealed and compared with winding domain boundaries in LiNbO3 grown by Czochralski method. Obtained results are significant to studying the mechanism of domain inversion and morphology of inversion domains.
Liquid-Solid Phase Transition in Sodium Dodecyl Sulfate Aqueous Solutions by Acoustic Nonlinearity Parameter B /A
LU Zhi-qu, GONG Xiu-fen, LIU Jie-hui
Chin. Phys. Lett. 1996, 13 (5): 366-369 .  
Abstract   PDF(pc) (206KB) ( 481 )
The paper reports the study of liquid-solid phase transition in sodium dodecyl sulfate ( SDS) aqueous solution by using acoustic nonlinearity parameter B/A. It was found that the point of inflexion occurred in the B/A - T curve just at the liquid-solid phase transition point of SDS aqueous solution This result indicates that the nonlinearity parameter B/A can perfectly display the liquid-solid phase transition of SDS solution and may develop a new B/A method for determining the phase transition point of fluid.
Generation of Sound by the Ultrashort Intense Laser Pulse in Water
FENG Shao-song, WANG Run-tian, HE Hui-Juan, LI Yong-chun, GU Sheng-ru, ZHANG Xiao-rong, GAN Chang-ming
Chin. Phys. Lett. 1996, 13 (5): 370-373 .  
Abstract   PDF(pc) (200KB) ( 400 )
The ultrashort intense Laser pulse transmitted by a Nd: YAG laser system is used to generate the sound in water.Experiments show that the light beam is converged by an optical lens at two points. This fact implies that the time response is inherent in the changes of optical index of water caused by the Light intensity.
Experimental Investigation of Reflectometry as a Density Fluctuation Diagnostic
XU Hong-liang, CAO Jin-xiang, DING Wei-Xing, YU Chang-xuan
Chin. Phys. Lett. 1996, 13 (5): 374-377 .  
Abstract   PDF(pc) (281KB) ( 305 )
In this paper, a controlled laboratory experiment to investigate the response properties of reflectometry to the density fluctuations is presented. The reflectometer signal is observed to be highly spatially localized in the plasma. The quantitative measurement has demonstrated that the signal originates aboutt one free space wavelength of the probe wave in front of the critical layer and this position is independentt of the fluctuation wavenumber. It is also found that the sensitivity of transverse response to wavenumbers is different from that of longitudinal response.
Experimental Results with Siliconization in Reversed Field Pinch Device
ZHANG Peng, LI Qiang, LUO Cui-wen, LI Jie-ping, FANG Shui-quan, YI Ping, XUE Jun, LI Ke-hua, LUO Jun-lin, CAO Zeng, HONG Wen-yu, ZHANG Nian-man, WANG Quan-ming, LU Jie, HUANG Ming, ZHONG Yun-ze, ZHANG Qing-chun, LUO Cui-xian
Chin. Phys. Lett. 1996, 13 (5): 378-381 .  
Abstract   PDF(pc) (193KB) ( 474 )
Reversed field pinch ( RFP ) and ultralow safety factor plasma experimental performances with pulsed discharge cleaning and siliconization on SWIP-RFP device are presented. The wall siliconization was performed by using the device discharges. The experimental results with siliconization in RFP devices showed that the impurity concentrations were decreased in the plasma and better plasma parameters were obtained in the device.
Dislocation Movement in Nitrogen-Doped Czochralski Silicon
WEI Ya-dong, LIANG Jun-wu
Chin. Phys. Lett. 1996, 13 (5): 382-385 .  
Abstract   PDF(pc) (160KB) ( 452 )
Dislocation movement in N-doped Czochralski silicon ( Cz-Si ) was surveyed by four point bend method, Dislocation movement velocities in Cz-Si doped with nitrogen, with both nitrogen and antimony, and with only antimony were investigated, The order of measured dislocation movement velocities, at 700°C ≤ T≤ 800°C and under resolved stress σ = 4.1 kg/ mm2, was Vsb,O >VN,sb,O >VN,O. The experiments showed that nitrogen doping could retard the movement of dislocations.

Pressure Dependence of the Orientational Ordering in Solid C60: the Statistical Theory
LIU Ying, SUN Hui-ling, HUA Wen-shen
Chin. Phys. Lett. 1996, 13 (5): 386-389 .  
Abstract   PDF(pc) (186KB) ( 467 )
Experiments on the pressure dependence of the orientational ordering in solid C60 suggest that the critical temperature increases with the increase of pressure. This paper has successfully explained this phenomenon from the view point of statistical physics on the basis of the order-disorder theory.

YBa2Cu3O7 Bicrystal Josephson Junctions and dc SQUIDs
Yu. V. Kislinskii, ZHAO Bai-ru, WU Pei-jun, PENG Zhi-qiang, CHEN Ying-fei, YANG Tao, CHEN Lie, SUN Ji-jun, XU Bo, WU Fei, ZHOU Yue-liang, LI Lin, ZHAO Zhong-xian, E. A. Stepantsov
Chin. Phys. Lett. 1996, 13 (5): 390-393 .  
Abstract   PDF(pc) (204KB) ( 421 )
Bicrystal Josephson junctions and direct current superconducting quantum interference devices ( dc SQUIDs) were prepares on YBa2Cu3O7( YBCO ) thin films deposited on yttrium stabilized ZrO2 bicrystal substrates The critical current densities Jc ~ 2 X 106 A/cm2 for YBCO thin film and (1 - 3 ) X 103 A/cm2 at boundaries were obtained at 77K. For YBCO Josephson junction made on 28°misorientated boundary, the Shapiro steps were observed. The dc SQUID was made on the 32° misorientated boundary junctions, which consisted of 40 X 40μm of loop and 2000 X 2000μm planar superconductive flux focuser. The voltage modulation depth of this SQUID was 6μV, and the magnetic field sensitivity was estimated to be ~ 2pT /√Hz from the measured noise level.
Raman Scattering Study of ND4+ -Ion Motion and Structural Phase Transitions in ( ND4)2PbCl6
SHI Jin-rong, XU Yong-chen, Y. Kume, R. Arnscheidt, J. Pelzl, WU Xiang
Chin. Phys. Lett. 1996, 13 (5): 394-396 .  
Abstract   PDF(pc) (178KB) ( 504 )
Raman spectra of the internal modes of ND4+-Ion in ( ND4)2PbCl6 crystal have been recorded in the temperature range of 5 - 300K. A new structural phase transition was observed at 34 K because of deuterium effect. Discontinuous behaviours of the interna1 modes of the ND4+-ion at this temperature show that the structural transition is one of first order.
Thermal Annealing of Si+ Implanted Chemical Vapor Deposition SiO2
ZHENG Xiang-qin, LIAO Liang-sheng, YAN Feng, BAO Xi-mao, WANG Wei*,
Chin. Phys. Lett. 1996, 13 (5): 397-400 .  
Abstract   PDF(pc) (227KB) ( 430 )
Ion implantation was used to bring silicon atoms into chemical vapor deposition SiO2. Two bands of photoluminescence spectra at about 540 and 640 nm were observed from the as-prepared samples. Thermal annealing behavior of the photoluminescence was studied The possible origin of the photoluminescence is discussed.
21 articles