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2012年  第29卷  第2期

核物理
致密物质性质和适用于超新星及中子星研究的状态方程(英文)
申虹, 王延楠
2012, 29(2): 117-122. doi: 10.11804/NuclPhysRev.29.02.117
摘要:
采用相对论平均场方法研究了致密物质的性质, 构造了包括较宽温度、 同位旋不对称度和密度范围的适用于超新星模拟研究的状态方程, 均匀物质由相对论平均场理论描述, 非均匀物质由托马斯费米近似给出。讨论了包含超子自由度的中子星物质的状态方程。 计算结果表明, 包含超子可以有效地软化高密度区的状态方程, Λ超子的超流态有可能存在于大质量中子星内部。The properties of dense matter are studied within the relativistic meanfield theory. The equation of state (EOS) of dense matter are constructed covering a wide range of temperature, proton fraction, and density for the use of supernova simulations. The relativistic meanfield theory is employed to describe the uniform matter, while the ThomasFermi approximation is adopted to describe the nonuniform matter. The EOS of neutron star matter is discussed with the inclusion of hyperons. It is found that the EOS at high density can be significantly softened by the inclusion of hyperons. The 1S0 superfluidity of Λ hyperons may exist in massive neutron stars.
对称核物质中核子-核子散射截面的研究
梁栋, 左维, 董建敏
2012, 29(2): 123-128. doi: 10.11804/NuclPhysRev.29.02.123
摘要:
在扩展的Brueckner-Hartree-Fock (BHF)理论框架下, 采用Argonne V14 两体相互作用势研究了对称核物质中核子-核子散射的总截面和微分截面, 分别讨论了三体核力(TBF)重排效应和基态关联效应对全同和非全同核子散射截面的影响。 计算表明: 低动量区域的基态关联效应会导致介质中核子-核子散射截面的增大; 而随着密度的增加,TBF重排效应的逐渐加强会减小介质中的核子-核子散射截面。 The nucleonnucleon cross sections in symmetric nuclear matter were investigated in the framework of the extended Brueckner-Hartree-Fock(BHF) approach with Argonne V14 two body interaction. The influences of the ground state correlation and the rearrangement contribution of the threebody force (TBF) on the cross section have been obtained and discussed separately for identical and nonidentical nucleon collisions. It is shown that the magnitudes of the cross section are increased by the effects of the ground state correlation in low momentum transfers,and are suppressed in medium with increasing density when the rearrangement contribution of the TBF force is considered.
利用同质异位素产额比提取对称能的近似方法
普洁, 乔庆鹏, 魏慧玲, 王闪闪, 马春旺, 张同林
2012, 29(2): 129-132. doi: 10.11804/NuclPhysRev.29.02.129
摘要:
在修改的Fisher模型框架下, 利用同质异位素产额比和结合能方程中对称能系数与温度比率的关联, 可以提取对称能系数与温度的比值。 利用3种不同的近似方法得到了重离子核反应产生丰中子余核的对称能系数与温度比(asym/T),并研究了相关物理量对asym/T的影响。结果表明, 库仑能对提取丰中子余核的asym/T影响较小,且参考核的选取对asym/T的提取也有一定的影响。 In the framework of the modified Fisher model, correlations between the symmetryenergy coefficient in semiclassical mass formula to temperature (asym/T) and the isobaric yield ratio in Heavyion collisions are established. asym/Tof neutronrich fragments are extracted using these correlations. It is found that the Coulombenergy term has little effect on asym/T of fragments, while the reference isobars adopted have great influence on the extracted a sym/T of fragments.
变形核强阻尼碰撞中巨复合体系的形成和衰变
邓天煜, 田俊龙, 田博博, 付栋之
2012, 29(2): 133-138. doi: 10.11804/NuclPhysRev.29.02.133
摘要:
利用改进的量子分子动力学(ImQMD)模型研究了质心系入射能量为980 MeV时变形核238U+238U体系的3种不同碰撞模式(腹对腹、 尖对腹和尖对尖)下强阻尼反应过程中初级超重碎块的产生几率和复合体系的寿命、 形状和拉长取向等性质, 发现尖对腹碰撞模式有利于初级超重碎块的产生, 还发现这种碰撞模式产生的复合体系有最长的寿命。Three different collision modes ( Bellybelly, Bellytip and Tiptip) of the deformed uranium nucleus 238U bombarding the deformed 238U in strongly damped reaction at the incident energy 980 MeV has been investigated based on the improved quantum molecular dynamics (ImQMD) model. The formation and properties of the formed composite system during the reaction process were carefully studied including the lifetime, the shape configuration and the angular distribution of primary fragment. It was found that the Bellytip mode is suitable for producing the superheavy fragments, and the composite system has the longest lifetime in this mode.
中子引起氘核破裂反应的实验研究
阮锡超, 欧阳晓平, 周祖英, 李霞, 蒋婧, 黄翰雄, 蒋顶悦, 仲启平, 任杰, 唐洪庆
2012, 29(2): 139-144. doi: 10.11804/NuclPhysRev.29.02.139
摘要:
对25 MeV中子引起氘核破裂反应的中子中子准自由散射和17.36 MeV中子引起氘核破裂反应的中子-中子末态相互作用进行了细致的研究。 首先, 以小于5%的不确定度, 精确测量了25 MeV中子中子准自由散射出射的中子三重微分截面。 实验数据用基于现实核子核子势(CD Bonn,Argonne ??18,Nijm I和II)的理论计算配合MonteCarlo模拟进行了分析。 实验结果比基于CDBonn势的理论预言高(16.0±4.6)%, 进一步证实了目前的理论在中子-中子准自由散射方面还无法准确描述实验数据。 其次, 通过运动学非完全测量, 精确测量了17.36 MeV中子引起氘核破裂反应在0°角附近出射的质子能谱, 用基于现实核子核子势(CDBonn、 BonnB和Nijm I)的理论计算以及MonteCarlo模拟分析了所测得的质子能谱, 确定了中子-中子散射长度ann=(-16.8±0.6) fm。 The neutronneutron (nn) quasifree scattering (QFS) at 25.0 MeV and nn final state interaction (FSI) at 17.4 MeV in the nd breakup reaction were studied in this work. First, the absolute breakup cross section was measured with an accuracy of <5 % in the nn QFS. The measured data was analyzed by MonteCarlo simulation based on modern realistic NN potentials (CDBonn, Argonne ??18, Nijm I and II). The measured data exceeds the theoretical prediction based on CDBonn by (16.0±4.6%). Second, the proton emission spectrum around 0° was measured in the nd breakup reaction at 17.4 MeV with kinematical incomplete setup. The data was analyzed by MonteCarlo simulation based on CDBonn. The nn scattering length determined in this work was ann=(-16.8±0.6) fm.
126Ce的EC/β+衰变
谢元祥, 徐树威, 马飞, 李占奎, 刘洪亮, 许甫荣
2012, 29(2): 145-148. doi: 10.11804/NuclPhysRev.29.02.145
摘要:
利用187 MeV的40Ca离子轰击同位素靶92Mo, 由熔合蒸发反应生成目标核126Ce。 藉助氦喷嘴快速带传输系统和X-X-t与X-γ-t符合测量, 首次建立了126Ce的EC/β+衰变纲图。 建议了可能属于126Ce一个高自旋同核异能态的衰变, 其β衰变后布居在与126La的高自旋同核异能态相关的低位能级区, 测定的半衰期是57(9) s。 也建议了可能属于126Ce基态的衰变, 其β衰变后布居在与126La的低自旋同核异能态相关的低位能级区,它的半衰期被测定为12(4) s。 但偶偶核126Ce存在高自旋同核异能态的物理原因还有待进一步探究。 Ce was produced by bombarding an enriched target of 92Mo with 187 MeV 40Ca beam and studiedby using a heliumjet fast tape transport system in combination with X-γ and γ-γ coincidencemeasurements. An EC/β+ decay scheme of 126Ce was proposed for the first time. A group of lowlying states associated with the lowspin isomer in 126La feeding by β decay was possibly from the groundstate EC/β+ decay of 126Ce with the measured half-life 12(4) s. Another group of lowlying states associated with the highspin isomer in 126La feeding by β decay was possibly from a highspin isomer EC/β+ decay of 126Ce with the measured half-life 57(9) s. However, the physical reason for the existence of a highspin isomer in even-even nucleus 126Ce is still an open problem.
利用波函数研究Bc介子纯轻衰变的QCD非微扰特性
郭鹏, 智海素, 侯召宇
2012, 29(2): 149-153. doi: 10.11804/NuclPhysRev.29.02.149
摘要:
Bc介子辐射性纯轻衰变的理论计算具有很大的强子型不确定性。利用3种类型的Bc介子波函数描述这种纯轻衰变的QCD非微扰特性, 并通过控制函数中参数的变化在理论上详细地计算了由介子波函数而引起的Bc介子辐射性纯轻衰变的这种强子型的不确定性。 结果表明,介子波函数的形式对计算的衰变结果有非常明显的影响, 该过程的分支比可在1.819 81×10-5~3.189 61×10-5间变化。 The radiative and pureleptonic decays of Bcmesons are of hadrons uncertainty in theoretical calculations. Using three types of the Bc meson wave functions which describe the characteristics of the QCD nonperturbative and by controlling the parameters in them, the uncertainties of Bc meson decay caused by the hadron decay model are studied in detail. The theoretical results show the branching ratios are (1.819 81~3.189 61)×10-5, which are sensitive to the type of wave functions.
加速器
偶极场扰动与冷却效应对同步运动的影响
吴木营, 罗诗裕, 邵明珠
2012, 29(2): 154-157. doi: 10.11804/NuclPhysRev.29.02.154
摘要:
在同步加速器特别是冷却存储环中,偶极场扰动和冷却效应将会对粒子的Betatron振荡和同步振荡产生影响。 叙述了偶极场扰动对粒子同步运动的影响与高频相位调制等效, 重点研究了偶极场扰动与冷却效应同时存在的情况对粒子的同步运动产生的影响。 在经典力学框架内把粒子的同步运动方程化为广义的摆方程, 然后利用Melnikov方法对系统的稳定性进行了分析, 讨论了系统进入Smale马蹄混沌的物理意义,并导出了系统稳定的临界条件。根据稳定性判据, 给出了系统稳定性所需要的偶极场扰动的高频相位调制幅度和冷却系数的限制条件。 结果表明, 系统的稳定性与它的参数有关, 只需适当调节这些参数, 混沌便可原则上控制或避免。 The Betatron oscillation and the synchrotron oscillation for the particles are effected by the dipole field perturbation and the cooling effect. Both effects are considered in the paper and the synchrotron motion equation of the particle in the synchroton is reduced to the general pendulum equation in the classical mechanics frame. The stabilities of the system caused by dipole field perturbation and cooling are analyzed by using Melnikov method. The thresholds entered a Smale horseshoe chaos are derived in detail and the stability conditions for the system caused by dipole field perturbation and cooling are dicussed. The results show that the critical condition or the stability thresholds are related to the system parameters. The chaos or an instability can be avoided or controlled in principle by regulating some parameters of the system.
耦合带状线定向耦合器大功率合成器的设计
王皓宁, 许哲, 赵红卫, 边志彬
2012, 29(2): 158-161. doi: 10.11804/NuclPhysRev.29.02.158
摘要:
介绍了直线加速器高频全固态功率源中大功率合成器件-3 dB定向耦合器的理论计算和工程设计过程, 该合成器工作频率80.5 MHz, 输出连续波功率大于20 kW。 分析了合成器的功率容量, 并对相应的理论计算结果、 CST (Computer Simulation Technology)软件模拟计算结果和实际功率合成器件测量结果进行了比较。 通过比较得出, CST仿真结果与测试结果基本一致, 隔离度和电压驻波比等实测指标优于设计指标, 只有耦合度与设计指标有些偏差, 总体上达到了预期的设计要求。 在输出功率20 kW时, 取样波形无失真, 合成器无明显温升, 满足固态功率源大功率稳定运行的要求。 The principle of design and calculation of the power synthesis in the solidstate amplifier are described in this paper. The working frequency of the synthesizer is 80.5 MHz. The output continuous wave power is more than 20 kW; The synthesizer power capacity is analyzed. The theoretical calculation results, Computer Simulation Technology (CST) simulated results are compared with the measured results of the actual 3 dB couplers. The analysis of the measured results and CST calculated results shows that the simulation is in agreement with the measurement results which meet the design requirements of the solidstate amplifier. Except the coupling coefficient, the isolation, the VSWR and other parameters are better than the design target. When the output power is 20 kW, the sampling waveform has no deform and the temperature of the synthesizer is stable.
核技术
基于飞行时间技术的PET发展历史与现状
贠明凯, 李婷, 章志明, 张玉包, 单保慈, 魏龙
2012, 29(2): 162-168. doi: 10.11804/NuclPhysRev.29.02.162
摘要:
简要介绍了基于飞行时间(Time of Flight, 简称TOF)技术的正电子发射断层扫描成像(Positron Emission Tomography, 简称PET)的基本原理, 回顾了TOF-PET成像设备的发展历史, 讨论了影响TOFPET时间分辨率的主要因素, 并对TOF-PET给图像重建技术带来的挑战进行了分析。 最后, 重点介绍了TOF-PET技术所带来的优势, 使用TOF技术可以有效地改善图像质量, 并且为临床诊断和临床前研究带来便利。 The principle of time of flight (TOF) positron emission tomography (PET) and a brief review of the history of TOF-PET are introduced. The factors influencing the time resolution of a TOF-PET scanner are presented, especially focus on the intrinsic properties of scintillators and frontend electronics. Challenges and achievements of the structure of data organization and image reconstruction are reviewed. Finally, the benefits of TOF-PET on image quality improvement and tumor detection are emphasized.
用于中子测量的俘获探测器研究
王玫, 温中伟, 林菊芳, 蒋励, 刘荣, 王大伦
2012, 29(2): 169-172. doi: 10.11804/NuclPhysRev.29.02.169
摘要:
为了在弱中子场和有限小空间内测量绝对裂变率, 制作了俘获探测器, 研究了俘获探测器的性能。 介绍了用于中子测量的俘获探测器和铅屏蔽室, 以及该探测器系统在特定条件下测量裂变反应率的结果, 并与裂变室测量结果进行了比较。 探讨了铅屏蔽室大小对测量结果的影响。 To detect the absolute neutron flux in a weak neutron field and restricted space, the fission fragment trapping detector was fabricated and the properties of the detector were studied. In this paper, the detector and shielding chamber used in neutron detection were described and the experimental measurements of the fission rate in specific condition were performed with the detection system and the result has been compared with that obtained by fission chamber. The influence of the shielding chamber on the measured results was analyzed.
低能中子探测的GEANT4模拟研究
吴冲, 张强, 孙志嘉, 唐彬, 周健荣, 许虹, 杨桂安, 王艳凤, 王拓, 杨振
2012, 29(2): 173-177. doi: 10.11804/NuclPhysRev.29.02.173
摘要:
研究了GEANT4蒙特卡罗模拟程序在低能中子核反应中应用的可行性, 新版的GEANT(4.9.4版本)升级了老版本在模拟6Li(n, α)3H核反应道的不足, 并且加入了最新截面数据库。 对多个核反应道进行了研究, 模拟结果显示核反应截面、 次级粒子能量和反应的分支比等是正确的; 比较了掺6Li材料热中子探测效率的实验结果与MCNP和GEANT4模拟结果, 它们基本一致。 研究表明, 利用GEANT4研究6Li(n, α)3H是可行的, 这为进一步研究闪烁体中子探测器的位置分辨率模拟提供了有力支持。 The feasible study of Monte Carlo simulation of lowenergy nuclear reaction was performed based on GEANT4. The reaction channel 6Li(n, α)3H, simulated insufficiently in the old version Geant4, can be given correct results in the new version (version 4.9.4). New cross section library was added into the program. The study of several nuclear reaction channels shows that the cross sections, the secondary particle energies and the branching ratios are consistent with the experimental values. For doped 6Li materials, the comparison of thermal neutrons detection efficiencies of experimental results, MCNP and GEANT4 simulations, shows that the simulations are reasonable. From the studies above, it is feasible to simulate the 6Li(n, α)3H reaction with GEANT4. It will provide helpful information for the further study of the position resolution of scintillation neutron detector.
交叉学科
Xe8+离子双电子复合速率系数的理论研究
张国鼎, 符彦飙, 董晨钟, 张义钊
2012, 29(2): 178-183. doi: 10.11804/NuclPhysRev.29.02.178
摘要:
利用基于全相对论组态相互作用理论的FAC程序包, 详细研究了温度在0.1~1650 eV范围内Xe8+离子的双电子复合(DR)过程。 通过比较4s, 4p和4d壳层电子激发的双电子复合速率系数, 发现温度在10 eV以上时, 内壳层4p电子激发的双电子复合速率数对总双电子复合速率系数有很重要的贡献, 而4s电子激发对总双电子复合速率数贡献小于7.5%。 给出了△n=0, 1和2 三类芯激发对总双电子复合速率系数的贡献以及自由电子俘获到不同主量子数的双电子复合速率系数, 发现△n=2的芯激发和n′>15的DR速率系数对总DR速率系数的贡献也很重要。 进一步给出了△n=0, 1和2 三类芯激发和总DR速率系数的拟合参数, 拟合结果和计算值符合, 偏差小于1%。 通过对双电子复合、 辐射复合以及三体复合速率系数的比较得知, 在温度高于1 eV时, DR过程是Xe8+离子的主要复合过程。Based on the fully relativistic configuration interaction method, theoretical calculations are carried out for the dielectronic recombination (DR) rate coefficients of Xe8+ ions in the temperature region from 0.1 to 1 650 eV. The comparison of the DR rate coefficients from 4s, 4p and 4d subshell excitations shows that 4d subshell excitation dominates in the whole temperature region. The contribution from 4p subshell excitation is very important at temperature above 10 eV and the contributions from 4s subshell excitation is lower than 7.5% in the whole temperature region. Similarly, the comparison of the DR rate coefficients through △n=0, 1 and 2 core excitation shows that the contribution from △n=2 core excitation can not be neglected, the contributions from n′>15 can also not be neglected. The DR rate coefficients of △n=0, 1 and 2 core excitation and the total DR rate coefficients are fitted with some parameters, which are in good agreement with theoretical calculations values (within 1% difference). The total DR rate coefficients are greater than radiative recombination (RR) and threebody recombination (TBR) rate coefficients at temperature above 1 eV. Therefore, the DR process can strongly influence the ionization balance of laser produced xenon plasmas.
强流电子束入射弯曲宏观石英管的导向效应研究
张明武, 王伟, 薛迎利, 于得洋, 陈婧, 武晔虹, 杨变, 蔡晓红
2012, 29(2): 184-188. doi: 10.11804/NuclPhysRev.29.02.184
摘要:
研究了强流(~129 nA)、 高能(1 500~1 900 eV)电子束在大角度(9°)弯曲宏观石英管中的导向效应。 实验分别测量了入射流强及能量对出射电子角分布值(FWHM)和传输效率的影响。 实验观察到出射电子角分布FWHM随着入射电子流强和入射电子能量增加变化均不明显; 发现电子传输效率随入射流强增加而增加, 但随入射能量增加而减小, 这与高电荷态离子导向中离子传输效率随入射能量增加而增加的现象相反。 分析发现, 与高电荷态离子导向机制不同, 电子束导向并非是由电子在石英管内壁的自组织充电过程引起的, 而是入射电子与管内壁弹性和非弹性散射碰撞共同作用的结果。
By using an incident electron beam with the high current and high energy, the guiding effect of the bended macroscopic quartz tube for the electron beam has been investigated. The angular distributions of outgoing electrons depending on the current and energy of incident electrons were measured. The dependences of electron transmitted fraction on energy and current of incident electrons are also shown. As the incident electron energy increasing, the electron transmitted fraction increases, but it decreases while the incident electron current increasing. The results have been compared with the present data. This work presents, the process of guiding electrons is essentially different from that of guiding highly charged ions, the guiding electron beam was caused by both elastic and inelastic collisions between electrons and inner walls of quartz tube, rather than selforganized charging effect on the surface of inner wall of quartz tube.
C离子辐照引起细胞分泌旁效应信号因子浓度随时间的变化
崔大超, 李强, 吴庆丰, 刘新国, 戴中颖
2012, 29(2): 189-195. doi: 10.11804/NuclPhysRev.29.02.189
摘要:
信号因子通常能介导旁效应的发生。 利用高LET C离子辐照体外培养的人肝癌QGY-7703细胞, 检测辐照后不同时刻培养基中信号因子TGF-β1和NO的浓度, 并通过转移培养基法检测照射后不同时刻转移培养基对人肝L02旁细胞存活率和代谢活力的影响, 发现受照射细胞在时间与空间上调控着周围信号因子的浓度, 并且通过信号因子浓度的变化影响旁细胞的各种效应发生。 实验为旁效应的解释提供了新的实验数据。
Signaling factors usually play an important role in bystander effect. In this work, human hepatoma QGY7703 cells in vitro were irradiated with highLET carbon ions. Concentrations of signaling factors such as TGF-β1 and NO were measured in the media of the irradiated QGY-7703 cells at different time points after irradiation. The conditioned media harvested at various times postirradiation were transferred to human hepatocyte L02 cells as bystander cells and then the influence of the conditioned media on survival fraction and cell viability of the bystander cells were determined. The results show that the irradiated cells regulate the concentration of the signaling factors released nearby themselves temporally and spatially, and the bystander cells response to the signaling factors differentially according to the concentration change. This work provides new basic data for exploring the bystander effect, especially caused by highLET radiation.
集簇性DNA损伤在辐射研究中的进展
杨立娜, 张红, 狄翠霞, 张秋宁, 王小虎
2012, 29(2): 196-201. doi: 10.11804/NuclPhysRev.29.02.196
摘要:
高LET重离子引起的集簇性DNA损伤会造成细胞突变、 癌变和凋亡。 促进肿瘤细胞凋亡一直是治愈肿瘤的出发点, 所以集簇性DNA损伤已经成为放射生物学领域研究的热点问题。 由于其提取和检测方法多样, 但并没有一个详细和完整的方案对集簇性DNA损伤进行透彻分析。 综述了集簇性DNA损伤的特点和详细讨论了集簇性DNA损伤最新研究进展, 简介了集簇性DNA损伤的研究方法, 以期为集簇性DNA损伤在放疗中的研究提供一些参考。 Clustered DNA damage which caused by high LET heavy ion radiation can lead to mutation, tumorigenesis and apoptosis. Promoting apoptosis of cancer cells is always the basis of cancer treatment. Clustered DNA damage has been the hot topic in radiobiology. The detect method is diversity, but there is not a detail and complete protocol to analyze clustered DNA damage. In order to provide reference for clustered DNA damage in the radiotherapy study, the clustered DNA damage characteristics, the latest progresses on clustered DNA damage and the detecting methods are reviewed and discussed in deteil in this paper.
基于BP神经网络的诱发铀部件裂变信号特征分析及识别
谢军华, 刘知贵, 任立学, 张活力
2012, 29(2): 202-207. doi: 10.11804/NuclPhysRev.29.02.202
摘要:
在对诱发铀部件裂变信号的测量原理及特点分析的基础上,开展了基于BP神经网络的诱发铀部件裂变时间关联信号特征参量分析处理的研究工作。 采用无偏估计方法, 计算信号的自相关函数和互相关函数, 再利用比较法和导数法两种特征量提取方法, 提取出不同状态下裂变信号的特征参量, 借助于BP神经网络模式识别应用原理进行训练和预测。 理论分析和研究结果表明: 基于比较法和导数法获得的特征参量能较好地反映诱发铀部件裂变信号的特征; 用BP神经网络对裂变信号进行模式识别, 取得了较高的正确率, 验证了此方法的有效性和合理性。 The paper presents feature parameter analysis and processing in fission timedependent signal of induced uranium components based on BPNeural Networks through the analysis of the measuring principle and signal characteristics of induced uranium components fission signal. The auto correlation functions and cross correlation functions are calculated by using unbiased estimate, and then the feature parameters of fission signal in different status are extracted by using feature abstraction method, comparative method and derivative method, and then applied to training and prediction by means of BPneural networks based on pattern recognition. Theoretical analysis and the results show that, it is effective to obtain feature parameters of induced uranium component fission signal via comparative method and derivative method. UsingBP neural network to recognize patter of fission signal, we got good results that verified the effectiveness and reasonability of the method.
核能与核数据
裂变产物产额数据的评价
陈永静, 刘廷进, 孙正军, 舒能川
2012, 29(2): 208-215. doi: 10.11804/NuclPhysRev.29.02.208
摘要:
以中子诱发235U裂变产生的135Xe 的累积产额数据为例, 利用了所有可利用的实验数据, 介绍了裂变产物产额数据的评价方法, 包括数据的收集、 修正、 评价、 误差调整和数据处理, 特别是协方差数据的评价、 半经验模型理论计算数据的应用和相关数据的处理, 给出了135Xe热能点产额的推荐值以及0~20 MeV产额-能量关系曲线。 Takeing 135Xe produced by neutron induced fission of 235U as an example, the evaluation method for fission yield was introduced using the all experimental data available. The evaluation procedure includes the experimental data collection, correction, evaluation, error assessment and data analysis. The study of the uncertainty covariance, application of semiempirical theoretical calculation and the yield energydependence of 135Xe in the incident energy range 0~20 MeV were emphasized in this work.