利用强流ISOL束研究^(20)Na的奇异衰变模式（英文）  

Study of the Exotic Decay Mode of ^(20)Na with an Intense ISOL Beam

作　　者：王友宝[1] 苏俊[1,2] 韩治宇 唐兵[1] 崔保群[1] 葛涛[1] 吕银龙[1] 陈志强[3] 郭冰[1] 李鑫悦[1] 李云居 李志宏[1] 连钢[1] 马田丽[1] 马鹰俊 谌阳平[1] 苏毅 王春光 吴弘毅 颜胜权 曾晟[1] 郑云[1] 周超[1,4] 党永乐 付光永[1] 何阳帆 刘伏龙 吴笛 张天爵 柳卫平 WANG Youbao;SU Jun;HAN Zhiyu;TANG Bing;CUI Baoqun;GE Tao;LU Yinlong;CHEN Zhiqiang;GUO Bing;LI Xinyue;LI Yunju;LI Zhihong;LIAN Gang;MA Tianli;MA Yingjun;SHEN Yangping;SU Yi;WANG Chunguang;WU Hongyi;YAN Shengquan;ZENG Sheng;ZHENG Yun;ZHOU Chao;DANG Yongle;FU Guangyong;HE Yangfan;LIU Fulong;WU Di;ZHANG Tianjue;LIU Weiping(China Institute of Atomic Energy,Beijing 102313,China;College of Nuclear Science and Technology,Beijing Normal University,Beijing 100875,China;School of Physics,Peking University,Beijing 100871,China;University of South China,Hengyang 421001,Hunan,China)

机构地区：[1]中国原子能科学研究院,北京102413 [2]北京师范大学核科学与技术学院,北京100875 [3]北京大学物理学院,北京100871 [4]南华大学,湖南衡阳421001

出　　处：《原子核物理评论》2018年第4期445-449,共5页Nuclear Physics Review

基　　金：国家自然科学基金资助项目(11875322,11327508);国家重点研发计划项目(2016YFA0400502).

摘　　要：北京放射性离子束装置(Beijing Radioactive Ion-beam Facility,BRIF)是基于在线同位素分离器技术的国家大科学平台。在BRIF装置上利用100 MeV的质子束轰击较厚的反应靶产生放射性核素;反应产物经离子源电离和在线分离,在线同位素分离段可引出100～300 keV的放射性核束,质量分辨率达20 000。在基金委科学仪器基础研究专项的支持下,建成了多用途的衰变实验终端,包括束流传输管道、通用靶室、带电粒子和γ探测器、集成电子学和数据获取系统等。利用100 MeV的质子束轰击MgO厚靶产生了流强高达1×105pps的^(20)Na放射性核束。通过高效率地同时测量β,γ和α,第一次直接观测到^(20)Na非常稀有的β-γ-α衰变模式。Beijing Radioactive Ion-beam Facility(BRIF) has been commissioned as the national Radioactive Ion Beam(RIB) facility based on the Isotope Separator On Line(ISOL) technique since 2016. At BRIF,the radioactive nuclides are produced by the proton beam of 100 MeV bombarding a thick-target, the reaction products diffusing out of the target are ionized by an ion source and delivered to the online mass separator. In addition to the post-accelerated radioactive ion beams, BRIF can provide low-energy ISOL beams of 100 to 300 keV with a mass resolution of 20 000. A general-purpose decay station has been built including the ISOL beam transport line, a conventional reaction chamber, charge-particle and γ detectors with integrated electronics and data acquisition system. An intense20Na ISOL beam up to 1 × 105 pps was produced by using the 100 MeV proton beam bombarding a MgO thick target. With high-efficiency measurements of β, γ and α simultaneously, very rare β-γ-α decay mode in20Na has been directly observed for the first time in the present work.

关 键 词：北京放射性离子束装置 在线同位素分离器 20Na放射性 奇异衰变模式 

分 类 号：O571.3[理学—粒子物理与原子核物理]