Chin. Phys. B
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CN 11-5639/O4
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Chin. Phys. B  
  Chin. Phys. B--1999, Vol.8, No.1
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GENERAL

BERRY PHASES IN THE QUANTUM STATE OF THE ISOTROPIC HARMONIC OSCILLATOR WITH TIME-DEPENDENT FREQUENCY AND BOUNDARY CONDITIONS

Liu Deng-yun
Acta Phys. Sin. (Overseas Edition), 1999, 8 (1): 1-7 doi: 10.1088/1004-423X/8/1/001
Full Text: [PDF 194 KB] (Downloads:351)
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The problem of the isotopic harmonic oscillator of time-dependent frequency confined in a spherical box with time-dependent radius is studied. We show that the exact solution and the Lewis invariant operator can be obtained by performing two consecutive gauge transformations on the time-dependent Schr?dinger equation. On the basis of the exact solution the non-adiabatic Berry phases for the system are calculated.

VECTOR LADDER OPERATORS FOR THE CENTRAL POTENTIALS

Ni Zhi-xiang
Acta Phys. Sin. (Overseas Edition), 1999, 8 (1): 8-13 doi: 10.1088/1004-423X/8/1/002
Full Text: [PDF 177 KB] (Downloads:1032)
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A new class of nonlinear Lie algebra has been found, which is generated naturally by the Hamiltonian operator, the square of the angular momentum operator and the ladder operator for the central potentials. According to the theory of nonlinear Lie algebra, without using the factorization method, we obtained the vector ladder operators for the three-dimensional isotropic harmonic oscillator and hydrogen atom. The radial components of these operators, which are independent of the quantum numbers, are just the radial ladder operators for the same potentials.

DOMAIN STRUCTURES AND ANISOTROPY IN Pt1-xCux/Co MULTILAYER THIN FILMS

Xu Hai, Han Bao-shan, Ma Ping-ping, Zheng Wu, Chen Jin-chang
Acta Phys. Sin. (Overseas Edition), 1999, 8 (1): 14-20 doi: 10.1088/1004-423X/8/1/003
Full Text: [PDF 446 KB] (Downloads:309)
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The domain structures of Pt1-xCux/Co multilayer films in as-grown and remanent states have been investigated by using magnetic force microscope. The magnetic domain patterns are strongly influenced by the Cu concentration. For pure Pt/Co multilayer in as-grown state, its domain pattern is depicted as island-like one; however, with the Cu doped in Pt spacer layers, the doman patterns become dot-like, but the island-like domain pattern appears again for the Cu concentration of 14 at%. The domain patterns variation can be attributed to the change of effective perpendicular anisotropy Kueff due to the effect of Cu atom doped in the Pt spacer layers. Besides, the domain structures of Pt/Co multilayer films in remanent state after the application of various perpendicular magnetic fields have also been studied.
NUCLEAR PHYSICS

THE SEPARATION TECHNIQUES FOR SECONDARY BEAMS AT RIBLL

Guo Zhong-yan, Zhan Wen-long, Liu Guan-hua, Sun Zhi-yu, Xiao Guo-qing, Jiang Shan-hong, Li Jia-xing, Wang Jin-chuan, Meng Xiang-wei, Zhang Wan-sheng, Qin Li-jun, Wang Quan-jin
Acta Phys. Sin. (Overseas Edition), 1999, 8 (1): 21-26 doi: 10.1088/1004-423X/8/1/004
Full Text: [PDF 249 KB] (Downloads:339)
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The Bρ-ΔE-Bρ-TOF techniques used for the identification and separation of radioactive nuclear beams (RNB) at RIBLL, are described. As a PF-type radioactive nuclear beam line, RIBLL can deliver RNB with high purity for light projectiles by using Bρ-ΔE-Bρ techniques, while for heavy ones, the Bρ-ΔE-Bρ-TOF methods must be adopted in order to identify the RNB clearly.
CLASSICAL AREAS OF PHENOMENOLOGY

ACOUSTIC INVERSE METHOD FOR MEASURING THE SIZE-DISTRIBUTION OF THE DROPS AND THE MOISTURE CONTENT IN WATER (CLOUD) FOG

Qian Zu-wen, Shao Dao-yuan, Li Xian-hui, Wang De-zhao
Acta Phys. Sin. (Overseas Edition), 1999, 8 (1): 27-31 doi: 10.1088/1004-423X/8/1/005
Full Text: [PDF 191 KB] (Downloads:344)
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The acoustic-energy loss was measured when the sound wave propagated through a layer of water fog. By the application of the sound attenuation theory in granular media and by means of the acoustic inverse (optimization) method, the size-distribution of the drops and the moisture content in the water fog were measured. It is demonstrated that the sizes of the water drops obey the normal distribution approximately. Comparison of the size-distribution results between data obtained by the inverse measurements and those obtained by the optic-microscopic-size methods shows good agreement with each other. The results of the moisture content and the thickness of the fog layers obtained by this method are also consistent with the results measured by other methods (for example, the water-content weight and the direct measurement of layer's thickness by a scale, etc.) reasonably.
PHYSICS OF GASES, PLASMAS, AND ELECTRIC DISCHARGES

ION HEATING EFFECTS IN LHCD SUSTAINED LOW DENSITY TOKAMAK PLASMAS

Kuang Guang-li
Acta Phys. Sin. (Overseas Edition), 1999, 8 (1): 32-39 doi: 10.1088/1004-423X/8/1/006
Full Text: [PDF 214 KB] (Downloads:482)
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In low density (~1018 cm-3) plasmas sustained by lower hybrid current drive in the high magnetic field superconducting tokamak Triam-1M (Kyushu University, Japan), high ion temperature has been frequently observed by an NEA diagnostic. The experimental phenomena are briefly described and analyzed in the paper. It is suggested by the analysis that the high ion temperature of the low density tokamak plasmas is attributed to ion Landau damping of lower hybrid wave.
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES

ORGANOMETALLIC SYNTHESIS AND QUANTUM SIZE EFFECT OF CdSe NANOCRYSTALLITES

Huang Hong-bin, Xu Ling, Chen Hong-ming, Huang Xin-fan, Chen Kun-ji, Feng Duan
Acta Phys. Sin. (Overseas Edition), 1999, 8 (1): 40-45 doi: 10.1088/1004-423X/8/1/007
Full Text: [PDF 224 KB] (Downloads:351)
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We have prepared nearly monodisperse CdSe nanocrystallites with diameters of 1-4 nm from the rapid pyrolysis of organometallic precursors in a hot coordinating solvent. The nanocrystal structures have been characterized by transmission electron microscopy and electron diffraction. From the absorption spectrum, we have observed the prominent peak of 1S-1S excitonic transition, which is obviously blue-shifted from the bulk bandgap and the largest shift is about 1.25 eV. We have used a theoretical model based on the tight binding approximation to analyze the quantum size effect of these nanocrystallites. The results have been compared with those of the effective mass approximation model.

CALCULATION OF ELECTRONIC STATES OF Si(337) SURFACE

Jia Yu, Ma Bing-xian, Shen San-guo, Yang Shi-e
Acta Phys. Sin. (Overseas Edition), 1999, 8 (1): 46-51 doi: 10.1088/1004-423X/8/1/008
Full Text: [PDF 196 KB] (Downloads:355)
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Using the scattering-theoretic method and employing the nearest-neighbor tight-binding formalism to describe the bulk electronic structure, we have studied the electronic structure of Si(337) surface. The wave-vector-resolved layer densities of states are presented. The results show that there are six surface bound states in the range from -12.0 to 2.0 eV. Some properties of these surface states are discussed.

PARABOLIC APPROXIMATION OF THE SPECIFIC HEAT IN QUANTUM XY SPIN GLASS MODEL WITH PLANAR DZYALOSHINSKII-MORIYA INTERACTIONS IN LONGITUDINAL FIELD

Shang Yu-min, Yao Kai-lun
Acta Phys. Sin. (Overseas Edition), 1999, 8 (1): 52-56 doi: 10.1088/1004-423X/8/1/009
Full Text: [PDF 199 KB] (Downloads:473)
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The quantum infinite range XY spin glass model with the infinite range planar Dzyaloshinskii-Moriya interaction in external field for spin S=1/2 is investigated theoretically. Numerical calculations show that, the specific heat depending on the temperature has crossover behavior; the weak field dependence of the specific heat can be fitted by the parabolic approximation, C/T=A+Bh2, the coefficient B is peaked near the transition point.

X-RAY PHOTOELECTRON SPECTROSCOPY STUDY ON ELECTROCHROMIC V2O5 THIN FILM

Wang Zhong-chun, Li Zhi-yong, Chen Xiao-feng, Hu Xing-fang
Acta Phys. Sin. (Overseas Edition), 1999, 8 (1): 57-62 doi: 10.1088/1004-423X/8/1/010
Full Text: [PDF 195 KB] (Downloads:940)
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Nanocrystalline V2O5 thin films were reactively radio-frequency magnetron-sputtered under optimal deposition parameters. Their electrochemical and electrochromic characteristics were investigated by cyclic voltammetry and in-situ monochromatic transmittance measurements. Upon lithium intercalation, V2O5 thin films showed a double electrochromic behavior depending on the wavelength and the intercalation extent. X-ray photoelectron spectroscopy results showed that part of the V5+ in V2O5 was reduced to V4+ during the Li+ intercalation process.
GEOPHYSICS, ASTRONOMY, AND ASTROPHYSICS

PULSED EMISSION OF VERY HIGH ENERGY GAMMA RAYS FROM CRAB PULSAR

Xu Chun-xian, He Hui-lin, He Hui-hai, Chen Yong-zhong, Li Hui-dong, Jiang Yin-lin
Acta Phys. Sin. (Overseas Edition), 1999, 8 (1): 63-70 doi: 10.1088/1004-423X/8/1/011
Full Text: [PDF 237 KB] (Downloads:419)
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We present here the results of observation of very high energy(VHE) gamma-ray emission from Crab Pulsar with the Beijing Atmospheric Cerenkov Telescopes, named ACT2 and ACT3, during the 1995-1996 season. The data are based on 168 h (ACT2) and 125 h (ACT3) of exposure over the period of observation in tracking mode. After converting the event time to the solar barycentre, the data have been searched for evidence of pulsed emission at 33 ms period of Crab Pulsar. We found no steady emission of VHE Gamma-ray with 33 ms period at the time scale of month or nights. But there are two evidences of sporadic emission over an hour duration with the same period as the one at radio wave band.
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