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charge resolution in the isochronous mass spectrometry and the mass of ^(51)Co

Nuclear Science and Techniques 2021年第4期32卷 30-37页

作者： Xu Zhou Meng Wang Yu-Hu Zhang Hu-Shan Xu You-Jin Yuan Jian-Cheng Yang Yu.A.Litvinov S.A.Litvinov Bo Mei Xin-Liang Yan Xing Xu Peng Shuai Yuan-Ming Xing Rui-Jiu Chen Xiang-Cheng Chen Chao-Yi Fu Qi Zeng Ming-Ze Sun Hong-Fu Li Qian Wang Tong Bao Min Zhang Min Si Han-Yu Deng Ming-Zheng Liu Ting Liao Jin-Yang Shi Yu-Nan Song Institute of Modern Physics Chinese Academy of SciencesLanzhou 730000China School of Nuclear Science and Technology University of Chinese Academy of SciencesBeijing 100049China GSI Helmholtzzentrum fu¨r Schwerionenforschung Planckstraße 164291 DarmstadtGermany Sino-French Institute of Nuclear Engineering and Technology Sun Yat-sen UniversityZhuhai 519082China School of Science Xi’an Jiaotong UniversityXi’an 710049China School of Nuclear Science and Engineering East China University of TechnologyNanchang 330013China CNRS/IN2P3 IJCLabUniversite´Paris-Saclay91405 OrsayFrance

Isochronous mass spectrometry(IMS)of heavyion storage rings is a powerful tool for the mass measurements of short-lived *** IMS experiments,masses are determined through precision measurements of the revolution times of the ions stored in the ***,the revolution times cannot be resolved for particles with nearly the same mass-to-charge(m/q)*** overcome this limitation and to extract the accurate revolution times for such pairs of ion species with very close m/q ratios,in our early work on particle identification,we analyzed the amplitudes of the timing signals from the detector based on the emission of secondary ***,the previous data analysis method is further improved by considering the signal amplitudes,detection efficiencies,and number of stored ions in the ring.A sensitive Z-dependent parameter is introduced in the data analysis,leading to a better resolution of ^(34)Ar^(18+) and ^(51)Co^(27+) with A/Z=17/*** mean revolution times of ^(34)Ar^(18+) and ^(51)Co^(27+) are deduced,although their time difference is merely 1.8 *** uncorrected,overlapped peak of these ions has a full width at half maximum of 7.7 *** mass excess of ^(51)Co was determined to be-27;332e41T keV,which is in agreement with the previous value of-27;342e48T keV.

关键词： Isochronous mass spectrometry charge resolution Signal amplitude Micro-channel plate ^(51)Co

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