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基于CSR高精度核质量测量

项目来源

国家重点研发计划(NKRD)

项目主持人

张玉虎

项目受资助机构

中国科学院近代物理研究所

项目编号

2018YFA0404401

立项年度

2018

立项时间

未公开

项目级别

国家级

研究期限

未知 / 未知

受资助金额

1035.00万元

学科

大科学装置前沿研究

学科代码

未公开

基金类别

“大科学装置前沿研究”重点专项

关键词

原子核质量测量 ; 储存环 ; 等时性质谱术 ; nuclear mass measurement ; storage ring ; isochronous mass spectrometry

参与者

梁晋洁

参与机构

未公开

项目标书摘要：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。

Application Abstract: 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.

项目受资助省

甘肃省

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  • 1.Improving the resolving power of Isochronous Mass Spectrometry by employing an in-ring mechanical slit

    • 关键词：
    • Storage ring; Isochronous mass spectrometry; Mass resolving power;TRANSITION ENERGY GAMMA(T); STORAGE-RING; EXOTIC NUCLEI; PROJECT;PHYSICS; MODE; IONS
    • Liu, J. H.;Xu, X.;Zhang, P.;Shuai, P.;Yan, X. L.;Zhang, Y. H.;Wang, M.;Litvinov, Yu. A.;Xu, H. S.;Blaum, K.;Bao, T.;Chen, H.;Chen, X. C.;Chen, R. J.;Fu, C. Y.;Liu, D. W.;Ge, W. W.;Mao, R. S.;Ma, X. W.;Sun, M. Z.;Tu, X. L.;Xing, Y. M.;Yang, J. C.;Yuan, Y. J.;Zeng, Q.;Zhou, X.;Zhou, X. H.;Zhan, W. L.;Litvinov, S.;Uesaka, T.;Yamaguchi, Y.;Yamaguchi, T.;Ozawa, A.;Sun, B. H.
    • 《18th International Conference on Electromagnetic Isotope Separators andRelated Topics 》
    • 2020年
    • SEP 16-21, 2018
    • CERN, Geneva, SWITZERLAND
    • 会议

    Isochronous Mass Spectrometry (IMS) in heavy-ion storage rings is an excellent experimental method for precision mass measurements of exotic nuclei. In the IMS, the storage ring is tuned in a special isochronous ion-optical mode. Thus, the mass-over-charge ratios of the stored ions are directly reflected by their respective revolution times in first order. However, the inevitable momentum spread of secondary ions increases the peak widths in the measured spectra and consequently limits the achieved mass precision. In order to achieve a higher mass resolving power, the ring aperture was reduced to 60 mm by applying a mechanical slit system at the dispersive straight section. The momentum acceptance was reduced as well as better isochronous conditions were achieved. The results showed a significant improvement of the mass resolving power reaching 5.2 x 10(5), though at the cost of about 40% ion loss.

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