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物理 2008年第10期37卷 733-739页

作者：曹中鑫叶沿林北京大学物理学院核物理与核技术国家重点实验室北京100871

文章介绍了放射性核束物理的现状和进展,给出了一些目前热点的研究问题和方向,比如垒下融合反应、费米能区和高能区直接核反应、滴线核性质、非稳定核区的新幻数和新的集体运动模式等.

关键词：放射性核束垒下融合直接核反应核幻数

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利用直接核反应研究轻丰中子核的奇特结构

中国科学：物理学、力学、天文学 2013年第10期43卷 1271-1281页

作者：杨再宏曹中鑫肖军吕林辉杨康杨彪叶沿林北京大学物理学院和核物理与核技术国家重点实验室北京100871

直接核反应是研究丰中子区核结构的重要手段.我们发展了质子标记的敲出反应实验方法,并用于6He和8He的结构研究,给出了7He共振态至今最精确的测量结果.发展了多中子关联测量技术,并基于此重建了8He激发态以及研究了8He中的双中子关联.通... 详细信息

直接核反应是研究丰中子区核结构的重要手段.我们发展了质子标记的敲出反应实验方法,并用于6He和8He的结构研究,给出了7He共振态至今最精确的测量结果.发展了多中子关联测量技术,并基于此重建了8He激发态以及研究了8He中的双中子关联.通过12Be的非弹散射实验,观测到若干共振态,构成6He+6He和4He+8He两条分子转动带,支持12Be的-4n-集团结构.

关键词：直接核反应质子标记集团结构双中子关联

Probing the halo and cluster structure of exotic nuclei

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Chinese Physics C 2012年第2期36卷 127-131页

作者：叶沿林吕林辉曹中鑫肖军 School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University

The Halo and cluster structure at the ground state of unstable nuclei are among the most exciting phenomena of current nuclear physics. Probing these structures requires a careful selection of reaction tools. In the past twenty years, knockout reactions have been used intensively to investigate spectroscopically the structure of unstable nuclei. In this report we have illustrated the latest development of the knockout reaction tool and have emphasized the recoiled proton tagging method. A quantitative criteria is developed to evaluate the quasi-free feature of the knockout process. The newly discovered ＂towing mode＂ reaction tool is also outlined and its applicability at transit energies is discussed.

关键词： halo nucleus knockout reaction proton tagging towing mode

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利用中高能破碎和敲出反应研究非稳定核结构

原子核物理评论 2010年第4期27卷 390-398页

作者：叶沿林 FAISAL Jamil-Qureshi 楼建玲葛愉成吕林辉曹中鑫肖军李奇特陈天逸杨帆北京大学物理学院和核物理与核技术国家重点实验室北京100871

中高能区的破碎和敲出反应,由于机制相对简单、对核的表面敏感、理论处理比较成熟等原因,在非稳定核的晕结构、壳移动等奇特性质研究中发挥了独到作用。针对次级束流强度较弱、能散较大等特点,实验上发展和应用了逆运动学有效立体角完... 详细信息

中高能区的破碎和敲出反应,由于机制相对简单、对核的表面敏感、理论处理比较成熟等原因,在非稳定核的晕结构、壳移动等奇特性质研究中发挥了独到作用。针对次级束流强度较弱、能散较大等特点,实验上发展和应用了逆运动学有效立体角完全测量、轻重靶结合、高精度消色差磁谱仪、前向中子谱仪、在束γ测量等技术手段,大大提升了实验的探测能力和选择性。从物理问题探索和实验路线演变的角度,回顾了非稳定核破碎和敲出反应的发展过程与启示,并探讨未来的走向。

关键词：破碎反应非稳定核核结构反应机制核探测技术

Monte Carlo simulation of the property of a scintillation bar in the multi-neutron correlation spectrometer

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Chinese Physics C 2009年第10期33卷 860-865页

作者：宋玉收叶沿林葛愉成吕林辉曲乐实江栋兴华辉郑涛李智焕李湘庆楼建玲卢飞范凤英曹中鑫李奇特肖军 School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University

To perform a kinematically complete measurement of the dissociation reaction for neutron-rich nuclei, a multi-neutron correlation spectrometer is proposed at Peking University. A Monte Carlo simulation code based on GEANT4 is developed for a single scintillation bar which processes not only the energy deposition but also the light propagation in the scintillator and the light collection and conversion to signal at the end of the bar in a realistic way. The simulating method is described in detail in this paper, and the timing and position resolutions and detector efficiency are studied based on the simulation and compared with the experimental results. A new method of crosstalk rejection has been demonstrated to be important for the design of the whole spectrometer.

关键词： neutron wall Monte Carlo simulation neutron halo

Experimental Study of Two-Neutron Correlation in ~8He^+

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Plasma Science and Technology 2012年第6期14卷 539-542页

作者：肖军叶沿林游海波杨再宏曹中鑫江栋兴郑涛华辉李智焕葛俞成李湘庆楼建玲李阔昂李奇特乔锐陈瑞九 School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University

A neutron detector array was used in a breakup reaction experiment at RIKEN with an 82.5 MeV/u SHe beam impinging on the CH2 and C targets. The array was calibrated using the cosmic ray, the 7 ray from the 6He＋Pb reaction and the mono-energetic neutrons from the 7Li（p, n）TBe（g.s.＋0.43 MeV） reaction. The position resolution, timing resolution and neutron de- tection efficiency were obtained accordingly. Cross-talk rejection conditions were developed based on analysis of the data taken from the 7Li（p, n）TBe（g.s.＋0.43 MeV） test experiment, and finally a preliminary two-neutron correlation function for the SHe breakup reaction was investigated.

关键词： SHe neutron cross-talk two-neutron correlation

Knockout Reaction Mechanism for ~6He^+

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Plasma Science and Technology 2012年第6期14卷 506-509页

作者：吕林辉叶沿林曹中鑫肖军江栋兴郑涛华辉李智焕葛俞成李湘庆楼建玲李阔昂李奇特乔锐游海波陈瑞九 School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University

A knockout reaction experiment was carried out by using the 6He beam at 82.5 MeV/nucleon impinging on CH2 and C targets. The a core fragments at forward angles were detected in coincidence with the recoiled protons at larger angles. From this exclusive measure- ment the valence nucleon knockout mechanism and the core knockout mechanism are separated. This study provides a basis for the exclusive spectroscopic investigation of the exotic nuclei.

关键词： knockout reaction reaction mechanism invariant mass

Recoiled Proton Tagged Knockout Reaction for 8He

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Plasma Science and Technology 2012年第6期14卷 460-463页

作者：曹中鑫叶沿林江栋兴郑涛李智焕华辉葛榆成李湘庆楼建玲肖军李奇特吕林辉李阔昂王赫乔锐游海波陈瑞九 School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University

An experiment for knockout reaction induced by SHe beam at 82.5 MeV/nucleon on CH2 and C targets was carried out. The 6He and 4He core fragments at forward angles and the recoiled protons at large angles were detected coincidently. From this exclusive measurement the valence nucleon knockout mechanism and the core knockout mechanism are separated, which can be applied to the exclusive spectroscopic study on the structure of exotic nuclei.

关键词： knockout reaction reaction mechanism invariant mass

Elastic Scattering of 6He ＋ p at 82.3 MeV/nucleon

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Chinese Physics Letters 2010年第9期27卷 65-68页

作者： FAISAL Jamil-Qureshi 楼建玲叶沿林曹中鑫江栋兴郑涛华辉李智焕李湘庆葛愉成庞丹阳李奇特肖军吕林辉乔锐游海波陈瑞九卢飞 Sakurai H Otsu H Nishimura M Sakaguchi S Baba H Togano Y Yoneda K 李琛王硕王赫李阔昂 Nakamura T Nakayama Y Kondo Y Deguchi S Satou Y Tshoo K H School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 RIKEN 2-1Hirosawa Wako Saitama 351-0198 Japan Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 Department of Physics Tokyo Institute of Technology Japan School of Physics Seoul NationM University Korea

Differential cross sections for the elastic scattering of halo nucleus 6He on proton target were measured at 82.3 MeV/u. The experimental results axe well reproduced by optical model calculations using global potential KD02 with a reduction of the depth of real volume part by a factor of 0.7. A systematic analysis shows that this behavior might be related to the weakly bound property of unstable nuclei.

关键词： Measurement

Knockout reaction induced by ^6He at 61.2 MeV/u

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Chinese Physics C 2011年第10期35卷 891-895页

作者：吕林辉叶沿林江栋兴华辉郑涛李智焕葛愉成李湘庆楼建玲曹中鑫宋玉收肖军李奇特乔锐游海波陈瑞久徐瑚珊王建松郭忠言张雪荧李琛胡正国陈若富王猛徐治国岳珂唐彬臧永东章学恒姚向武陈金达白真 School of Physics and State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 China Institute of Modern Physics Chinese Academy of Sciences Lanzhou 730000 China

A knockout reaction induced by ^6He at 61.2 MeV/u was carried out at the HIRFL-RIBLL ra- dioactive beam line. The α core fragments at forward angles were detected in coincidence with the recoiled protons at large angles. From this coincident measurement the valence nucleon knockout mechanism and the core knockout mechanism can be separated according to the polar angle correlation between the core fragments and the recoiled protons. It is demonstrated that, when reconstructing the resonant state of a weakly bound nucleus, the contamination resulting from the core knockout mechanism should be eliminated in order to obtain the correct structure information.

关键词： halo nucleus knockout reaction reaction mechanism invariant mass spectra