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原子核物理：英文版

原子核物理：英文版

  • 发文量：237
  • 被引量：13
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  • 开始收录时间：1994(1)
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  • 创刊时间：1979
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    国际刊号/ISSN：2L无
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    主办单位：中国核物理学会
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原子核物理：英文版 >1997年第4期

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  • 摘要：ＴｈｅＤｏｕｂｌｅＩｏｎｉｚａｔｉｏｎｏｆＨｅｌｉｕｍｂｙ１．５～７．５ＭｅＶＰａｒｔｉａｌｙＳｔｒｉｐｐｅｄＦｌｕｏｒｉｎｅＩｏｎｓ①ＣａｉＸｉａｏｈｏｎｇａ，ｂ，ＣｈｅｎＸｉｍｅｎｇａ，ＳｈｅｎＺｉｙｏｎｇａ，ＬｉｕＺｈａｏｙｕａｎａ，ＭａＸｉｎ...
  • 摘要：ＴｈｅＭｉｘｅｄＲｅｓｃａｌｉｎｇＭｏｄｅｌａｎｄＮｕｃｌｅａｒＤｒｅｌ┐ＹａｎＰｒｏｃｅｓ①ＬｉｎＺｈｏｎｇｊｉｎ②ＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃｓ，ＸｉａｍｅｎＵｎｉｖｅｒｓｉｔｙ，Ｘｉａｍｅｎ３６１００５Ｒｅｃｅｉｖｅｄ２Ｊａｎｕａｒｙ１...
  • 摘要：ＡＰｒａｃｔｉｃａｌＳＯ（７）ＬｉｍｉｔｉｎｔｈｅＦｅｒｍｉｏｎＤｙｎａｍｉｃａｌＳｙｍｍｅｔｒｙＭｏｄｅｌ①ＬｉｕＧｕａｎｇｚｈｏｕａｎｄＬｉｕＷｅｉＤｅｐａｒｔｍｅｎｔｏｆＰｈｙｓｉｃｓａｎｄＣｅｎｔｅｒｏｆＴｈｅｏｒｅｔｉｃａｌＰｈｙｓｉｃｓ，...
  • 摘要：ＡｎＥｆｅｃｔｉｖｅＭｅｔｈｏｄｆｏｒＳｔｕｄｙｉｎｇＨｅａｖｙＮｅｕｔｒｏｎ┐ＲｉｃｈＮｕｃｌｉｄｅＷａｎｇＪｉｃｈｅｎｇ，ＧｕｏＧｕａｎｇｈｕｉ，ＺｈａｏＪｉｎｈｕａａｎｄＹａｎｇＹｏｎｇｆｅｎｇＩｎｓｔｉｔｕｔｅｏｆＭｏｄｅｒｎＰｈｙｓｉｃｓ，...
  • 摘要：ＣａｌｃｕｌａｔｉｏｎｏｆＣｏｎｔｉｎｕｕｍγ┐ｒａｙＳｐｅｃｔｒｕｍＦｒｏｍＮｅｕｔｒｏｎＩｎｄｕｃｅｄＲｅａｃｔｉｏｎｓＦａｎＳｈｅｎｇａｎｄＺｈａｏＺｈｉｘｉａｎｇＣｈｉｎａＩｎｓｔｉｔｕｔｅｏｆＡｔｏｍｉｃＥｎｅｒｇｙＰ．Ｏ．Ｂｏｘ２７５（４...
  • 摘要：ＣａｌｃｕｌａｔｉｏｎｏｆＲａｄｉａｌＤｏｓｅＤｉｓｔｒｉｂｕｔｉｏｎＡｒｏｕｎｄｔｈｅＰａｔｈｏｆａＨｅａｖｙＩｏｎｉｎＬｉｑｕｉｄＷａｔｅｒ①ＬｉＱｉａｎｇ，ＷｅｉＺｅｎｇｑｕａｎａｎｄＣｈｅｎＷｅｉｑｉａｎｇＩｎｓｔｉｔｕｔｅｏｆＭｏｄｅｒｎＰ...
  • 摘要：ＴｈｅＶｏｌｔｅｒａ，ｓＩｎｔｅｇｒａｌＥｑｕａｔｉｏｎＴｈｅｏｒｙｆｏｒＡｃｅｌｅｒａｔｏｒＳｉｎｇｌｅ┐ＦｒｅｅｄｏｍＮｏｎｌｉｎｅａｒＣｏｍｐｏｎｅｎｔｓＷａｎｇＳｈｅｎｇａｎｄＸｉｅＸｉＧｒａｄｕａｔｅＳｃｈｏｏｌｏｆＮｕｃｌｅａｒＩｎｄｕｓ...
  • 摘要：ＤｅｕｔｅｒｏｎＦｏｒｍＦａｃｔｏｒｓｉｎａＱＣＤＩｎｓｐｉｒｅｄＭｏｄｅｌ①ＣａｏＪｕｎａｎｄＷｕＨｕｉｆａｎｇＩｎｓｔｉｔｕｔｅｏｆＨｉｇｈＥｎｅｒｇｙＰｈｙｓｉｃｓ，Ｐ．Ｏ．Ｂｏｘ９１８（４），Ｂｅｉｊｉｎｇ１０００３９Ｒｅｃｅｉｖｅｄ１６Ｊａ...
  • 摘要：ＡｎｇｕｌａｒＤｅｐｅｎｄｅｎｃｅｏｆＣｏｈｅｒｅｎｃｅＥｎｅｒｇｙｉｎＤｉｓｉｐａｔｉｖｅＲｅａｃｔｉｏｎｏｆ１９Ｆ＋５１Ｖ①ＬｕＪｕｎ，ＷａｎｇＱｉ，ＸｕＨｕｓｈａｎ，ＬｉＳｏｎｇｌｉｎ，ＺｈｕＹｏｎｇｔａｉ，ＹｉｎＸｕ，ＦａｎＥｎｊｉｅａｎｄＺ...
  • 摘要：正 Hot nuclei produced in the reactions of 25 MeV/u40Ar with 209Bi andNa1Ag are studied.Theinitial properties of these nuclei :excitation energies,linear momentum transfer and temperatures are char-acterized through the measurements of folding angle of fission fragments,light charged particle energyspectra and intermediate mass fragments.Nuclei with excitation energies as high as～600 MeV and tem-peratures as high as～6 MeV are produced.The spectra of alpha particles detected in coincidence with fis-sion fragments in the case of different average linear momentum transfer are analyzed and the initial tem-peratures of the hot nuclei are determined.A saturation（or limiting）temperature near 6 MeV is foundfor alpha emission from medium mass nuclei having excitation energies higher than 3 MeV/u.This resultprovides evidence for a soft nuclear equation of state at thee high excitation energies and is consistentwith predictions of statistic multifragmentation model calculations.
  • 摘要：正 A transient magnetic field-ion implanted perturbed angular distribution spectrometer has beenset up at CIAE HI-13 tandem accelerator.This spectrometer is used to measure y-factors of high spinstates with lifetime of pico-or subpico-seconds.The 9-factors of the high spin states in 83y,84Zr and87Nbhave been successfully determined with it.
  • 摘要：正 The synchronization of chaotic nonlinear systems has attracted much attention in recent years.Practical applications are being realized in the area of secure communications.However,a few syn-chronization hyperchaos have been reported.We have extended the drive-response relationship scheme(DRRS)of chaotic synchronizationproposed by Pecora and Carroll to hyperchaos in the complex Lorenz-Haken system.But some-
  • 摘要：正 A two-component(considering the transfer reaction and fragmentation process,respectively)model is proposed to calculate the width of the momentum distribution of projectile-like-fragment(PLF)from heavy ion reaction.The theoretical results are compared with the experimental data.
  • 摘要：正 RF effect and space charge effect are the main sources of the emittance growth in the RF elec-tron gun.The single particle dynamics near the cathode is discussed,and the emittance growth due to RFnonlinear force and time-dependent force are studied in detail.Comparison with the emittance at the gunexit shows that the emittanca growth due to nonlinear RF effect near the cathode can not be neglected.
  • 摘要：正 Coupled oscillators are common in many scientific areas,such as optics,communications,engi-neering,biology,etc.The synchronization of oscillators has important practical applications.This letter focuses on synchronization of coupled hyperchaotic oscillators,which exists in natureand in laboratory and is very important.
  • 摘要：正 With the recently obtained vacuum configuration of the bilocal field,we discuss the decay con-stant f_σ and m_σ of σ-meson in a quantum Chromodynamics(QCD)-based model field theory.Reasonablevalues of f_σ and m_σ are obtained.
  • 摘要：正 Based on the generalized boson-fermion expansion technique,a microscopic sdg IBM plus two-quasiparticle approach is proposed to investigate the high spin states,The effect of the 8-boson on the back-bending phenomenon and the states below 2 MeV are discussed for the Ba isotopes.
  • 摘要：正 The Relativistic Vlasov-Uehling-Uhlenbeck(RVUU)model is used to study the properties of pi-ons and kaons produced in heavy ion collisions.We include the nuclear medium effect on kaon and pionin the model,and simulate pion production and subthreshold kaon production in Kr+Zr reactions at 1GeV/u.The calculated results show that the attractive pion optical potential changes the final-state pionmomentum spectrum,enhancing the yield of pions with low transverse momenta.At the same ti1e it alsoincreases the kaon abundance and modifies the kaon momentum distribution.
  • 摘要：正 A modified renormalization approach based on that proposed by Druce et al.is presented.The over-all agreement between the spectra calculated here and the accurate spectra is significantly improved.We also useDurce’s approach to generate the renormalized spectra.It is shown that in our microscopic study,both of the ap-proaches are very useful to the determination of several free parameters of fermion residual interactions.
  • 摘要：正 A method of neural network identifying tau decay modes is described.The systematic errors re-lated to the neural network are discussed in detail.A method is used to analyze one-prong hadronic tau de-cays in L3 experiment.
  • 摘要：正 A dynamic model of DNA molecules which takes into account the interaction of the nearestbase pairs between the different strands is presented.The nonlinear effect and phase transition aresimulated by the nuclear transport theory and the method of fractorial moment in high energy physics,re-spectively.The results show that the nonlinear interaction of the nearest base pairs between the differentstrands may play a rule in DNA molecules.
  • 摘要：正 Lai and Grebogi demonstrated that by combining the Pecora-Carrool(drive-response)scheme(PISS)with the variable feedback synchronization(VFS),it is possible to synchronize two nearlyidentical hyperchaotic systems.This is called the drive-feedback synchronization(DFS).In thismethod,the feedback control is directly proportional to the difference of dynamical variable fromtwo hyperchaotie systems,and is applied to one of the systems.But in Lai and Grebogi’s work the
  • 摘要：正 In the framework of classical trajectory model the Langevin random force is included in the mo-tion equations.The phase space distribution of an ensemble of trajectories for the 58Ni+58Ni reaction isgiven in the proximity model and Gross-Kalinowski model,respectively.The fusion probabilities for the100Mo+100Mo and 86Kr+123Sb reactions are calculated by Monte Carlo sampling of Langevin trajectories.
  • 摘要：正 The Harmonic OseiUator Quadruple Pairing Cranking Hartree-Fock-Bogoliubov（HFB）theoreti-cal model is established and applied to the superdeforrned（SD）rotational states.The reduction and col-lapse of the pairing fields,including Y20,Y21 and Y22 fields at superdeformation and high spins,are stud-ied.It is found that the correct rotational frequency ω-dependence of the pairing fields is crucial for thetheory to reproduce the rising behavior of dynamic moment of inertia J（2） observed in the A=190 region,and the Y21 pairing contributes significantly to reducing the rising rate of J（2） and thus may strongly influ-enee the collective properties of SD nuclei.The calculated J（2） of 192H8 is in good agreement with the ex-perimental data up to （?）ω=0.32 MeV.
  • 摘要：正 The alignment of the angular momenta in single-particle energy levels is studied based on a ro-taring two-center shell model for heavy-nucleus 238U.It is found that large deformation of the nucleusfavours the alignment and a complete alignment of the angular momenta occurs only at large deformationand high cranked frequency.Meanwhile,it is shown that the shell correction energy is mainly determinedby the deformation of the nucleus and slightly varies with the total spin except that the total spin is largerthan 80（?）.It is also found that the two valleys of the potential energy surface become shaUow and finallydisappear with the increase of total spin.
  • 摘要：正 The first three-fold and four-fold fragmentation measurements in hot compound nuclei pro-duced in the reactions of a 25 MeV/u 40At beam with targets of 209Bi,197Au,159Tb,115In,103Rh,and93Nb are presented.Various distributions are measured for these fragments,including distributions of ve-locities,relative velocities,angles,relative angles,masses,fragment mass ratios,total kinetic energies（TKE）,as well as the yield ratios of three-fold fragmentation to fission P32 and the time difference △t be-tween two scissions after the formation of one compound nucleus.
  • 摘要：正 Defects induced by 5 and 9.5 MeV fast neutron irradiations in N-type HB single crystal GaAsare studied by the positron annihilation lifetime technique.Mono-and di-vacancies are created for the neu-tron irradiation to a fluence of 1013 n/cm2 and only rnono-vacancies are produced for the neutron irradia-tion to a fluence of 1011～1012n/cm2.It is found that the higher the irradiating neutron energy and flu-ence,the higher the intensity of the produced defects.As a result the defect production rate becomes in-creasingly more sensitive to the neutron fluence than to the neutron energy.The annealing behavior of thedefects is also investigated up to 750℃.Tri-vacaneies are formed between 450 and 620℃ in GaAs irra-diated to 1013 n/cm2 by 9.5 MeV neutrons.Three annealing stages are observed for the mono-,di-andtri-vacancies.
  • 摘要：正 The mass of 168Dy is measured for the first time,using the two-proton pick-up reaction 170Er(18O,20Ne)at an 18O energy of 104 MeV.The products of the reaction are detected at the focal plane ofthe Q3D spectrometer.The mass excess of 168Dy is found to be -58.56±0.14 MeV.
  • 摘要：正 The nonlinear space charge effect of bunched beam in linac is one of the important factors thatinduces the emittance growth due to the conversion of the field energy to kinetic energy.In this paper,us-ing a cylinder model of space charge in linac,we derived the internal energy for a bunched beam withsome nonuniform space charge distributions,such as longitudinal Gaussian distribution combined withKapchinskij-Vladimirski1,waterbag,parabolic or Gaussian transverse distribution.And the emittancegrowth caused by the above distributions is worked out.

    原子核物理：英文版的期刊信息

    • 曾用名：原子核物理(英文版)
    • 创刊时间：1979
    • 地区：CN
    • 语言：中文
    • 热门主题：REACTION MEV CROSS NUCLEI MODEL SUB REACTIONS ANGULAR MICROSCOPIC SCATTERING
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