2001年 第18卷 第3期
2001, 18(3): 129-137.
doi: 10.11804/NuclPhysRev.18.03.129
摘要:
包含s夸克的强子称为奇异强子,它与核子相互作用的研究近年来有了长足发展 .在指出这种研究的重要意义后,从实验和理论两方面介绍奇异强子 (主要是K介子和超子 )与核子相互作用的研究现状及方法等 ,包括运动学和动力学机制、介子交换模型和夸克模型解释诸方面的问题. We try to highlight some of the key issues regarding the interactions between strange hadron and nucleon, which relate to the kinematics and dynamics mechanism, meson exchange model and quark model. Starting from a brief introduction on the main research goals, we focus on the status of experimental and theoretical investigations of kaon nucleon and hyperon nucleon interactions, which may be considered to be a necessary basis for the studies of nuclear physics with strangeness.
包含s夸克的强子称为奇异强子,它与核子相互作用的研究近年来有了长足发展 .在指出这种研究的重要意义后,从实验和理论两方面介绍奇异强子 (主要是K介子和超子 )与核子相互作用的研究现状及方法等 ,包括运动学和动力学机制、介子交换模型和夸克模型解释诸方面的问题. We try to highlight some of the key issues regarding the interactions between strange hadron and nucleon, which relate to the kinematics and dynamics mechanism, meson exchange model and quark model. Starting from a brief introduction on the main research goals, we focus on the status of experimental and theoretical investigations of kaon nucleon and hyperon nucleon interactions, which may be considered to be a necessary basis for the studies of nuclear physics with strangeness.
2001, 18(3): 138-142.
doi: 10.11804/NuclPhysRev.18.03.138
摘要:
报道了用 1 996年 1 0月完成的羊八井 EAS加密阵列探测器 ( Tibet 和 HD)于 1 997- 1 998年进行的全天区观测数据 ,对 3Te Vγ暴进行寻找的结果 .发现了一批显著性明显超过 3σ、少数显著性超过 4σ的事例团. A search for γ ray bursts at 3 TeV energy region was done by using the data of Tibet HD air shower array, which was obtained in the period of Febuary 1997-June 1998. About 2.5×10 9 EAS events were analysed to search for the shower clusters appearing in a fixed time intervial and small sky bin. An equal zenith angle method is used to estimate the background and three different time intervals(Δ t =1, 10, 100 s) were adopted in the research. A part of clusters show excess over the...
报道了用 1 996年 1 0月完成的羊八井 EAS加密阵列探测器 ( Tibet 和 HD)于 1 997- 1 998年进行的全天区观测数据 ,对 3Te Vγ暴进行寻找的结果 .发现了一批显著性明显超过 3σ、少数显著性超过 4σ的事例团. A search for γ ray bursts at 3 TeV energy region was done by using the data of Tibet HD air shower array, which was obtained in the period of Febuary 1997-June 1998. About 2.5×10 9 EAS events were analysed to search for the shower clusters appearing in a fixed time intervial and small sky bin. An equal zenith angle method is used to estimate the background and three different time intervals(Δ t =1, 10, 100 s) were adopted in the research. A part of clusters show excess over the...
2001, 18(3): 143-146.
doi: 10.11804/NuclPhysRev.18.03.143
摘要:
用相对论性密度依赖的 Hartree方法研究晕核的基本性质 ,在晕核的唯象图景中 ,作为剩余相互作用的对关联效应对核晕的描述有关键作用 .用只有一个自由参数的模型 ,同时给出了晕核11Li,11Be和 19C的分离能和质量密度分布 ,和实验数据符合很好. The basic properties of halo nuclei are investigated in the relativistic density dependent Hartree approach, where the correlation effects among halo particles are crucial for the description of the halo property. Adapting only one free parameter, we have calculated the separation energies and mass density distributions of halo nuclei 11 Li, 11 Be and 19 C and they are in good agreement with the experimental data.
用相对论性密度依赖的 Hartree方法研究晕核的基本性质 ,在晕核的唯象图景中 ,作为剩余相互作用的对关联效应对核晕的描述有关键作用 .用只有一个自由参数的模型 ,同时给出了晕核11Li,11Be和 19C的分离能和质量密度分布 ,和实验数据符合很好. The basic properties of halo nuclei are investigated in the relativistic density dependent Hartree approach, where the correlation effects among halo particles are crucial for the description of the halo property. Adapting only one free parameter, we have calculated the separation energies and mass density distributions of halo nuclei 11 Li, 11 Be and 19 C and they are in good agreement with the experimental data.
2001, 18(3): 147-151.
doi: 10.11804/NuclPhysRev.18.03.147
摘要:
讨论了天体物理环境中爆发性核合成及其与核结构的紧密关系.用反射不对称壳模型计算了远离稳定线丰中子核148Ba的低能八极转动带,结果与实验很好符合.展示了其应用于不稳定核低能态计算的有效性 ,以及在核天体物理研究中的应用前景.The explosive nucleosynthesis in the astrophysical environment and its close link to nuclear structure are discussed. The low lying octupole bands for neutron rich nucleus 148 Ba far from the stability line have been calculated by the reflection asymmetric shell model and the results are in good agreement with the experimental data, presenting the capability of the model for calculations of the low lying states of unstable nuclei as well as the foreground of application in nuclear astrophysics.
讨论了天体物理环境中爆发性核合成及其与核结构的紧密关系.用反射不对称壳模型计算了远离稳定线丰中子核148Ba的低能八极转动带,结果与实验很好符合.展示了其应用于不稳定核低能态计算的有效性 ,以及在核天体物理研究中的应用前景.The explosive nucleosynthesis in the astrophysical environment and its close link to nuclear structure are discussed. The low lying octupole bands for neutron rich nucleus 148 Ba far from the stability line have been calculated by the reflection asymmetric shell model and the results are in good agreement with the experimental data, presenting the capability of the model for calculations of the low lying states of unstable nuclei as well as the foreground of application in nuclear astrophysics.
2001, 18(3): 152-155.
doi: 10.11804/NuclPhysRev.18.03.152
摘要:
质子放射性是极端丰质子核的一个重要性质 .球形核的质子发射用 WKB方法可以很好地描述 ,变形核的质子发射则须解耦合道的薛定谔方程 .通过140Ho和141Ho质子发射体的研究可给出非束缚 Nilsson轨道的结构信息.Proton emission is a very important property of the extreme proton rich nuclei. It is introduced that the proton emission from a spherical nucleus can be well described by WKB method, while that from a deformed nucleus must be described by means of solving coupled channel Schrdinger equations. The investigation of the proton emitters 140Ho, 141Ho offered information about the structure of unbound Nilsson orbitals.
质子放射性是极端丰质子核的一个重要性质 .球形核的质子发射用 WKB方法可以很好地描述 ,变形核的质子发射则须解耦合道的薛定谔方程 .通过140Ho和141Ho质子发射体的研究可给出非束缚 Nilsson轨道的结构信息.Proton emission is a very important property of the extreme proton rich nuclei. It is introduced that the proton emission from a spherical nucleus can be well described by WKB method, while that from a deformed nucleus must be described by means of solving coupled channel Schrdinger equations. The investigation of the proton emitters 140Ho, 141Ho offered information about the structure of unbound Nilsson orbitals.
2001, 18(3): 156-159.
doi: 10.11804/NuclPhysRev.18.03.156
摘要:
以很长半衰期 ( 4 2× 1 0 9a)的 β-衰变的187Re-187Os核对作为大尺度的宇宙核钟来量度宇宙的年纪 ,是近代天文学与核物理学相结合的又一典范 .这种宇宙时钟是利用裸核187Re与它的衰变子体187Os同位素在共生矿中天然含量的比值来测定时间的 .利用187Re裸核的半衰期通过核物理计算可对中性 187Re的半衰期进行修定.To the great scale of the universe age, 187 Re- 187 Os isotopic pair, which have very long half life, was used as a cosmic nuclear clock of cosmochronometr. It is a typical relationship between modern astronomy and nuclear physics. The neutral isotope abundance ratio of 187 Re over daughter nucleus 187 Os in common growth mineral can be used as the clock to measure the time. After the 75 electrons in all shells of 187 Re were stripped ...
以很长半衰期 ( 4 2× 1 0 9a)的 β-衰变的187Re-187Os核对作为大尺度的宇宙核钟来量度宇宙的年纪 ,是近代天文学与核物理学相结合的又一典范 .这种宇宙时钟是利用裸核187Re与它的衰变子体187Os同位素在共生矿中天然含量的比值来测定时间的 .利用187Re裸核的半衰期通过核物理计算可对中性 187Re的半衰期进行修定.To the great scale of the universe age, 187 Re- 187 Os isotopic pair, which have very long half life, was used as a cosmic nuclear clock of cosmochronometr. It is a typical relationship between modern astronomy and nuclear physics. The neutral isotope abundance ratio of 187 Re over daughter nucleus 187 Os in common growth mineral can be used as the clock to measure the time. After the 75 electrons in all shells of 187 Re were stripped ...
2001, 18(3): 160-163.
doi: 10.11804/NuclPhysRev.18.03.160
摘要:
正在建设中的兰州重离子加速器冷却储存环 ( HIRFL- CSR)的主环加速腔系统用于将累积的重离子束流进行加速 .其频率范围为 0 .2 5 - 1 .7MHz,峰值电压为 8.0 k V.重点介绍了主环加速腔系统的设计及主要高频参数 ,包括高频腔体的设计及低电平控制部分的设计. An ion cooler storage ring HIRFL CSR is constructing at Institute of Modern Physics(IMP). It consists of two rings--main ring (CSRm) and experimental ring (CSRe). For the CSRm, two RF systems will be employed. One is for RF stacking, and another is for beam accelerating. The designed parameters of CSRm accelerating system and the control block diagram of RF system are described. The RF accelerating system has a specification of lower and wider frequency range from 0.25 to 1.7 MHz...
正在建设中的兰州重离子加速器冷却储存环 ( HIRFL- CSR)的主环加速腔系统用于将累积的重离子束流进行加速 .其频率范围为 0 .2 5 - 1 .7MHz,峰值电压为 8.0 k V.重点介绍了主环加速腔系统的设计及主要高频参数 ,包括高频腔体的设计及低电平控制部分的设计. An ion cooler storage ring HIRFL CSR is constructing at Institute of Modern Physics(IMP). It consists of two rings--main ring (CSRm) and experimental ring (CSRe). For the CSRm, two RF systems will be employed. One is for RF stacking, and another is for beam accelerating. The designed parameters of CSRm accelerating system and the control block diagram of RF system are described. The RF accelerating system has a specification of lower and wider frequency range from 0.25 to 1.7 MHz...
2001, 18(3): 164-168.
doi: 10.11804/NuclPhysRev.18.03.164
摘要:
简要地介绍了单晶Si中注入掺杂原子在热激活退火中发生的瞬间增强扩散现象 ,综述了该现象发生的可能的微观机制和目前提出的几种抑制方法 ,展望了高能重离子在该领域的应用前景.The transient enhanced diffusion in crystalline silicon implanted with dopants and followed by high temperature annealing to activate the dopants is introduced. The physical mechanisms of transient enhanced dopant diffusion are then reviewed together with a short introduction to the proposed suppressing methods. Finally, the perspectives with using high energy heavy ions in this field are briefly discussed.
简要地介绍了单晶Si中注入掺杂原子在热激活退火中发生的瞬间增强扩散现象 ,综述了该现象发生的可能的微观机制和目前提出的几种抑制方法 ,展望了高能重离子在该领域的应用前景.The transient enhanced diffusion in crystalline silicon implanted with dopants and followed by high temperature annealing to activate the dopants is introduced. The physical mechanisms of transient enhanced dopant diffusion are then reviewed together with a short introduction to the proposed suppressing methods. Finally, the perspectives with using high energy heavy ions in this field are briefly discussed.
2001, 18(3): 169-173.
doi: 10.11804/NuclPhysRev.18.03.169
摘要:
在理论分析的基础上 ,提出了一种利用兰州重离子加速器提供的高能12C离子模拟质子引起单粒子效应的途径 .在保证核反应机制是引起单粒子效应主要机制的前提下,用高能12C离子可以模拟质子在功率金属 -氧化物 -半导体场效应晶体管中引起的单粒子烧毁以及单粒子栅极击穿 ,获得质子单粒子效应的饱和截面 ,定性研究质子单粒子效应的角度效应 ,还可以作为高能质子单粒子效应实验前的预备实验 .该方法拓展了兰州重离子加速器加速的轻的重离子在单粒子效应实验研究方面的应用 ,对现阶段国内开展质子单粒子效应实验研究具有重要意义. The mechanisms for proton and heavy ion induced single event effect (SEE) are discussed and a method to simulate proton induced SSEE (PSEE) with high energy 12 C is proposed in this paper. The experiments which can be done by using this method include single event burnout (SEB) and single event gate rupture in power MOSFET, single event upset (SEU) and single event transient (SET) in less sensitive device and angle effect. The experimets with high energy ...
在理论分析的基础上 ,提出了一种利用兰州重离子加速器提供的高能12C离子模拟质子引起单粒子效应的途径 .在保证核反应机制是引起单粒子效应主要机制的前提下,用高能12C离子可以模拟质子在功率金属 -氧化物 -半导体场效应晶体管中引起的单粒子烧毁以及单粒子栅极击穿 ,获得质子单粒子效应的饱和截面 ,定性研究质子单粒子效应的角度效应 ,还可以作为高能质子单粒子效应实验前的预备实验 .该方法拓展了兰州重离子加速器加速的轻的重离子在单粒子效应实验研究方面的应用 ,对现阶段国内开展质子单粒子效应实验研究具有重要意义. The mechanisms for proton and heavy ion induced single event effect (SEE) are discussed and a method to simulate proton induced SSEE (PSEE) with high energy 12 C is proposed in this paper. The experiments which can be done by using this method include single event burnout (SEB) and single event gate rupture in power MOSFET, single event upset (SEU) and single event transient (SET) in less sensitive device and angle effect. The experimets with high energy ...
2001, 18(3): 174-176.
doi: 10.11804/NuclPhysRev.18.03.174
摘要:
介绍了在兰州重离子加速器上采用 75 Me V/u16O8+离子进行了贯穿与定点注入的实验 ,以及不同注入部位的种子在实验室萌发的根尖细胞染色体的微核率和畸变率与大田培育结果随剂量的变化情况 .经过 3年 5代 (南繁加代 )的系统选育 ,筛选出增产、矮杆、抗 (锈 )病、抗干热风和早熟等 9个稳定突变系.Penetration and site chosen implantation of spring wheat seeds at HIRFL with 75 MeV/u 16 O 8+ ions were caried out. The seeds, of which the different sites ware implanted by the ions were germinated in room. The frequency of micronuclei and chromosome aberration in their root tip cells was observed. The results of their cultivation in the field were different. Through selection of three year five generations (adding a generation in southern China each year), nine stable...
介绍了在兰州重离子加速器上采用 75 Me V/u16O8+离子进行了贯穿与定点注入的实验 ,以及不同注入部位的种子在实验室萌发的根尖细胞染色体的微核率和畸变率与大田培育结果随剂量的变化情况 .经过 3年 5代 (南繁加代 )的系统选育 ,筛选出增产、矮杆、抗 (锈 )病、抗干热风和早熟等 9个稳定突变系.Penetration and site chosen implantation of spring wheat seeds at HIRFL with 75 MeV/u 16 O 8+ ions were caried out. The seeds, of which the different sites ware implanted by the ions were germinated in room. The frequency of micronuclei and chromosome aberration in their root tip cells was observed. The results of their cultivation in the field were different. Through selection of three year five generations (adding a generation in southern China each year), nine stable...
2001, 18(3): 177-180.
doi: 10.11804/NuclPhysRev.18.03.177
摘要:
在论述重离子治癌照射的基本思想及其特点的基础上,着重对磁扫描照射野形成的两种技术路线——点扫描和栅扫描的优缺点进行了分析阐述.初步给出了 HIRFL上的重离子治癌终端磁扫描相关参数. The basic principle and characteristic of irradiation in heavy ion radiotherapy are introduced. Based on the basic principle and characteristic of irradiation in heavy ion radiotherapy, two magnetic scan methods for creating uniform irradiation field--the spot scan and the raster scan, are compared briefly. The parameter requests to the magnetic scanning system of the heavy ion radiotherapy facility planned in IMP(Institute of Modern Physics) are presented.
在论述重离子治癌照射的基本思想及其特点的基础上,着重对磁扫描照射野形成的两种技术路线——点扫描和栅扫描的优缺点进行了分析阐述.初步给出了 HIRFL上的重离子治癌终端磁扫描相关参数. The basic principle and characteristic of irradiation in heavy ion radiotherapy are introduced. Based on the basic principle and characteristic of irradiation in heavy ion radiotherapy, two magnetic scan methods for creating uniform irradiation field--the spot scan and the raster scan, are compared briefly. The parameter requests to the magnetic scanning system of the heavy ion radiotherapy facility planned in IMP(Institute of Modern Physics) are presented.
2001, 18(3): 181-187.
doi: 10.11804/NuclPhysRev.18.03.181
摘要:
简要介绍了国际上发展中的核科学和技术及其应用对微观核数据的需求和核数据理论计算中现有标准程序的基本情况,并做了相应的分析和比对 .同时也简要介绍了国际上核数据理论计算中模型方法研究的新进展.Developing nuclear data needs towards to sustainable development on fission reactor design and many nuclear applications out the field of fission reactor technology that are growing economic significance and that have substantial data requirements are introduced. International standard codes used in nuclear data evaluation and calculation are presented and compared with each other. Generally speaking, three rather wide groups of nuclear reaction models used usually are also described...
简要介绍了国际上发展中的核科学和技术及其应用对微观核数据的需求和核数据理论计算中现有标准程序的基本情况,并做了相应的分析和比对 .同时也简要介绍了国际上核数据理论计算中模型方法研究的新进展.Developing nuclear data needs towards to sustainable development on fission reactor design and many nuclear applications out the field of fission reactor technology that are growing economic significance and that have substantial data requirements are introduced. International standard codes used in nuclear data evaluation and calculation are presented and compared with each other. Generally speaking, three rather wide groups of nuclear reaction models used usually are also described...
2001, 18(3): 188-191.
doi: 10.11804/NuclPhysRev.18.03.188
摘要:
以最新的微观评价库CENDL-2.1为基础,用先进的群常数制作程序系统——NJOY来制作新的WIMS69群截面库,研究不同的 NJOY输入参数对 WIMS程序所计算的积分量的影响,并给出了详细的参数研究结果,同时还分析和讨论了计算结果与基准实验结果的比对.WIMS multi group constant library is the associated working library of WIMS/D4 lattice code, and it was created by using rather old and obsolete data based on ENDF/B3 (1972). Recently, the new evaluated data files such as ENDF/B 6.5, JEF 2.2, CENDL 2.1 and JENDL 3.2 were released. It s necessary to update the old library by the new evaluated data. The parameter study is performed to investigate the sensitivity of the integral parameters calculated with WIMS/D4 on the selection...
以最新的微观评价库CENDL-2.1为基础,用先进的群常数制作程序系统——NJOY来制作新的WIMS69群截面库,研究不同的 NJOY输入参数对 WIMS程序所计算的积分量的影响,并给出了详细的参数研究结果,同时还分析和讨论了计算结果与基准实验结果的比对.WIMS multi group constant library is the associated working library of WIMS/D4 lattice code, and it was created by using rather old and obsolete data based on ENDF/B3 (1972). Recently, the new evaluated data files such as ENDF/B 6.5, JEF 2.2, CENDL 2.1 and JENDL 3.2 were released. It s necessary to update the old library by the new evaluated data. The parameter study is performed to investigate the sensitivity of the integral parameters calculated with WIMS/D4 on the selection...
2001, 18(3): 192-196.
doi: 10.11804/NuclPhysRev.18.03.192
摘要:
介绍了当今世界上五大评价中子数据库 ,即美国的 ENDF/B- 6、日本的 JENDL- 3.2、欧洲的 JEF- 2 .2、中国的 CENDL- 2 .1及俄罗斯的 BROND- 2 ,的现况 ,以及国际评价中子数据库的发展趋势和用户如何获得与使用这些数据.The present status of the five major evaluated neutron nuclear data libraries in the world, i.e. ENDF/B 6(America), JENDL 3.2(Japan), JEF 2.2(Europe), CENDL 2.1(China), BROND2(Russia) are introduced. The developing trend of the international neutron evaluated nuclear data library is discussed. How to get and use these data for the domestic users is alro presented.
介绍了当今世界上五大评价中子数据库 ,即美国的 ENDF/B- 6、日本的 JENDL- 3.2、欧洲的 JEF- 2 .2、中国的 CENDL- 2 .1及俄罗斯的 BROND- 2 ,的现况 ,以及国际评价中子数据库的发展趋势和用户如何获得与使用这些数据.The present status of the five major evaluated neutron nuclear data libraries in the world, i.e. ENDF/B 6(America), JENDL 3.2(Japan), JEF 2.2(Europe), CENDL 2.1(China), BROND2(Russia) are introduced. The developing trend of the international neutron evaluated nuclear data library is discussed. How to get and use these data for the domestic users is alro presented.
2001, 18(3): 197-200.
doi: 10.11804/NuclPhysRev.18.03.197
摘要:
利用相对论量子分子动力学模型 RQMD,对 RHIC能区 s =2 0 0 AGe VAu+ Au中心碰撞进行了 2 π干涉学分析,对 HBT关联相干因子 λ的行为进行了研究 .研究表明 ,参数 λ一般小于理想混沌源时的值,这反映了源的部分相干特性外 ,还与源的膨胀和持续冻结有关 ,体现为 λ参数对粒子的冻结时间较为敏感.Using the dynamical transport model RQMD with a correlation after burner, the behavior of two pion HBT λ parameter is studied in Au+Au central collisions at RHIC energy s=200 A GeV. The λ parameter is found to be sensitive to the sequential freeze out in heavy ion collisions.
利用相对论量子分子动力学模型 RQMD,对 RHIC能区 s =2 0 0 AGe VAu+ Au中心碰撞进行了 2 π干涉学分析,对 HBT关联相干因子 λ的行为进行了研究 .研究表明 ,参数 λ一般小于理想混沌源时的值,这反映了源的部分相干特性外 ,还与源的膨胀和持续冻结有关 ,体现为 λ参数对粒子的冻结时间较为敏感.Using the dynamical transport model RQMD with a correlation after burner, the behavior of two pion HBT λ parameter is studied in Au+Au central collisions at RHIC energy s=200 A GeV. The λ parameter is found to be sensitive to the sequential freeze out in heavy ion collisions.
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