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Volume 7 Issue 1
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Original Articles
SCALAR SOLITON BLACK HOLE AT FINITE TEMPERATURE
PAN Rongshi, SU Rukeng*
Chin. Phys. Lett. 1990, 7 (1): 1-4 .  
Abstract   PDF(pc) (49KB) ( 502 )
The non-topological solutions of scalar soliton black hole are extended to finite temperature. We find that the mass of soliton black hole is a monotonously rising function of temperature. A system of soliton black holes is thermodynamical stability. The thermodynamical behaviour between soliton black hole and usual black hole are compared.
OPTICAL ISOTOPE SHIFT MEASUREMENTS USING COLLINEAR ION BEAM LASER SPECTROSCOPY AND THE CONFIGURATION OF THE NdII(23537)09/2 LEVEL
LU Fuquan, WU Songmao, WANG Yansen, SHI Wei, SHI Peixiong, SONG Linggen, YANG Jianjun, TANG Jiayong, YANG Fujia*
Chin. Phys. Lett. 1990, 7 (1): 5-8 .  
Abstract   PDF(pc) (52KB) ( 313 )
The optical isotope shifts,of five even isotopes of neodymium have been measured by using collinear ion beam laser spectroscopy(CZBLS). Isotopically pure NdII ions with energy of 30ke V from an isotope separator were collinearly interacted with light from a tunable dye laser and selectively excited from a metastable level of 4f45d6K9/2 to the (23537)09/2 level by Doppler tuning technique. The resonant excitation frequency values for each Nd isotope with mass number of 142, 144, 146, 148 and 150 were obtained. After the separation of the normal and specific mass shift and the field shift from the experimentally measured isotope shift, the configuration of the (23537)09/2, level was decomposed into 4f46p, 4f3 5d2 and 4f3 5d6p , and their fractions, for the first time. were determined to be 0.1 2-0.13, 0.88-0.85 and 0-0.02, respectively.
OPTICAL FIELD INDUCED REFRACTIVE INDEX CHANGE DUE TO COLLISION-ENHANCED ZEEMAN COHERENCE
Zou Yinghua (Y.H.Zou) and YANG Yang
Chin. Phys. Lett. 1990, 7 (1): 9-11 .  
Abstract   PDF(pc) (42KB) ( 484 )
The collision-enhanced Zeeman coherence ρ(2) (ωl -ω2) has been demonstrated by the effect of optical field induced index of refraction change, which is described by the real part of the nonlinear susceptibility x(3) (- ωl,ωl - ω2,ω2) . The experiments are performed in sodium vapor by a Mach-Zehnder interferometer. The dependences of the effect on the magnetic field, pump beam intensity, and Ar pressure are consistent with the theory.

FERMI-PASTA-ULAM RECURRENCE AND THE BOUND-STATE SOLITARY-WAVES ON THE FLUID FREE-SURFACE IN A TROUGH
XU Yangguang, WEI Rongjue
Chin. Phys. Lett. 1990, 7 (1): 12-15 .  
Abstract   PDF(pc) (79KB) ( 280 )
The solution of bound-state of solitary-waves of a NLS type equation governing the modulational evolution of standing gravity wave in a rectangular fluid-trough is given. The time evolution of this solution exhibits the FPU recurrence behaviour, which is in good agreement with the phenomenon observed by Wu et al. in a water trough experiment [Phys.Rev.Lett.52(1984)1421].
STUDY OF MICROTURBULENCE ON THE KT-5 TOKAMAK BY CO2 LASER SCATTERING
CHANG Liyan, ZENG Lei, CAO Jinxiang, YU Changxuan, ZU Qinxin*
Chin. Phys. Lett. 1990, 7 (1): 16-19 .  
Abstract   PDF(pc) (64KB) ( 422 )
We report our observation of low frequency (LF) density fluctuation of microturbulence in KT-5 tokamak. Broad frequency and wavenumber power spectra are observed. The density fluctuation frequencies are found to be around a few hundred kHz, and at higher frequencies the fluctuation level rolls off as n2 (f) ∝ f with β = 1 - 3. The wavenumber power spectrum S(k) can be fitted into S(k) ∝ k with a around 3.0.

RFPRODUCTION OF HIGH DENSITY F2+ CENTERS IN UNDOPED AND DOPED SODIUM FLUOWE CRYSTALS
GU Hongen, QI Lan*
Chin. Phys. Lett. 1990, 7 (1): 20-23 .  
Abstract   PDF(pc) (53KB) ( 319 )
F2 centers in colored undoped and doped NaF crystals can be converted nearly completely into F2+ centers with the high density of more than 1017cm-3 by irradiating the crystals with a 505nm laser at room temperature. A process of conversion from F2+ to (F2+)* centers in the NaF crystals doped with divalent metal ions such as Mn++, Mg++ and Ni++ after the 505nm laser irradiation was observed in our experiments.

THEORETICAL PREDICTION OF MELTING TEMPERATURE FOR SILICON
ZI Jian, ZHANG Kaiming, XIE Xide
Chin. Phys. Lett. 1990, 7 (1): 24-27 .  
Abstract   PDF(pc) (43KB) ( 359 )
A dynamical calculation of the state equation is presented to give a good prediction of the melting temperature for silicon which is much better than the molecular dynamics simulation result and agrees satisfactorily with the experimental value.
THE POSSIBILITIES OF COLD NUCLEAR FUSION OF DEUTERIUM
JIN Shangxian, DING Yibing, LIU Yongzhen, WU Bailu, YAO Decheng
Chin. Phys. Lett. 1990, 7 (1): 28-31 .  
Abstract   PDF(pc) (51KB) ( 339 )
The possible mechanisms of deuteron-deuteron fusion during electrolytic infusion of deuterons into metallic palladium electrode are studied, and a rough estimations of the fusion rate are made. Our results show that D-D fusion rate in the equilibrium deuteron system at normal temperature and atmospheric pressure can not reach the level which can be measured experimentally.
INFLUENCE OF LITHOGRAPHICAL PROCESSES ON THE SUPERCONDUCTIVITY OF YBaCuO THIN FILMS
SUN Yuping, LIU Genqing, XU Xingcai, ZHU Xi, LUO Tangsheng
Chin. Phys. Lett. 1990, 7 (1): 32-35 .  
Abstract   PDF(pc) (46KB) ( 395 )
This letter presents the results of the influnces of an ultra-violet lithography (UVL) and a h e r beam canning lithography (LBSL) on the superconductivity of YBaCuO thin films on SrTiO3 substrates. The degeneration of superconductivity of YBaCuO thin films in UVL process is more than that in LBSL process.
NONEQUILIBRIUM PHENOMENA IN Sn-Sn-PbBi SYSTEM PLACED IN VARIOUS SAMPLE SURROUNDINGS
ZHAO Shiping, LIU Guirong, YANG Qiansheng
Chin. Phys. Lett. 1990, 7 (1): 36-39 .  
Abstract   PDF(pc) (61KB) ( 278 )
Nonequilibrium superconductivity and intermediate states in Sn-Sn-PbBi system have been studied in different sample surroundings of vacuum, gas helium, and liquid helium. General behaviors under quasiparticle injection are presented. Nonequilibrium quasiparticle distribution function is modeled by the μ* - T* scheme, and the phonon trapping factor τesB is calculated through R-T equations.
THE LUMINOSITY OF A FREELY FALLING LIGHT SOURCE AND THE HAWKING TEMPERATURE
ZHAO Zheng
Chin. Phys. Lett. 1990, 7 (1): 40-43 .  
Abstract   PDF(pc) (40KB) ( 439 )
It is proposed that the luminosity, the information and the frequency of a freely falling light source to an event horizon appear to the observer resting with respect to the horizon to decrease exponentially with a time scale which depends on the temperature of the horizon. This conclusion is valid not only for the Schwarzschild black hole, but also for the other black holes, the Rindler horizon, and the deSitter horizon.
IMAGE SPLITTINGS IN AN INHOMOGENEOUS UNIVERSE
WU Xiangping
Chin. Phys. Lett. 1990, 7 (1): 44-47 .  
Abstract   PDF(pc) (54KB) ( 572 )
In the previous paper(Chin.Phys.lett.6(1989)233) the-amplification, luminosity distances and probabilities for lensing an the case of small optical depth were discussed. As the second part of this work, the present paper will deal with multiple images produced by pointlike lensing objects which are assumed to be the dominant contributors of inhomogeneities in the universe. The expectation values of image separations, the visual magnitude and solid angle of each image will be calculated.
12 articles