精确测量短寿命原子核的质量是国际核物理前沿研究领域。国家重点研发计划项目“高精度核物理实验研究”下属子课题一“基于CSR高精度核质量测量”重点针对质量数A小于100的一批短寿命原子核的质量开展高精度测量。本课题依托兰州重离子冷却储存环(CSR),研制新型的飞行时间探测器，在国际上率先研发双TOF等时性质谱技术。截止2020年中，课题已经利用58Ni、86Kr和112Sn主束流开展了三轮次质量测量实验，建立了基于双TOF的新型等时性质谱术，数据处理工作已经基本完成。基于新测质量结果，进行了同位旋以及第二类壳演化的研究。另外理论方面，不稳定原子核质量和低位激发态的第一性原理计算也取得了重要成果。The high precision mass mmeasurement of short-lived atomic nuclei is the frontier research field of international nuclear physics.The first sub-project of the National Key Research and Development Program"High-precision Nuclear Physics Experimental Research","High-precision nuclear mass measurement based on CSR"focuses on high-precision measurement of the mass of short-lived nuclei with mass number A less than 100.This project relies on the Lanzhou Heavy Ion Cooling Storage Ring(CSR)to develop a new type of time-of-flight(TOF)detector,and is the first international facility to develop double-TOF isochronous mass spectrometry technology.Up to August of 2020,this subject has carried out three rounds of quality measurement experiments using 58Ni,86Kr and 112Sn as primary beams,built up the new isochronous mass spectrometry technologyand based on double TOFs and the data processing has been basically completed.Based on the newly measured mass values,the isospin and the evolution of the second type of shell are studied.In addition,in theory,the first-principles calculations of the masses and low-level excited states of short-lived nuclei have also achieved important results.

在2019年度内，本课题围绕着短寿命原子核质量的精确测量开展了一系列的研究工作。包括：新型飞行时间探测器的研制，新的数据处理与分析方法，奇A铟同位素中的组态依赖性壳演化，不稳定原子核质量和低位激发态的第一性原理计算。In 2019 we have carried out a series of research work related to the precision mass measurements of short-lived nuclei.A selected list includes development of new time-of-flight detectors,proposal of a new data analysis method,configuration-dependent shell evolution in odd-A indium isotopes,and ab initio calculations of masses and low-lying excitation energies of unstable nuclei.