Charge resolution in the isochronous mass spectrometry and the mass of ~(51)Co
Charge resolution in the isochronous mass spectrometry and the mass of ~(51)Co
复制标题
等时质谱中的电荷分辨率和 Co-51 的质量
DOI：
10.1007/s41365-021-00876-0
复制
发表时间：
2021
影响因子：
2.8
通讯作者：
Deng H
中科院分区：
文献类型：
--
作者：
Zhou Xu;Wang Meng;Zhang Yuhu;Xu Hushan;Yuan Youjin;Yang Jiancheng;Litvinov Yu A;Litvinov S A;Mei Bo;Yan Xinliang;Xu Xing;Shuai Peng;Xing Yuanming;Chen Ruijiu;Chen Xiangcheng;Fu Chaoyi;Zeng Qi;Sun Mingze;Li Hongfu;Wang Qian;Bao Tong;Zhang Min;Si Min;Deng H
重离子储存环等离子体质谱（IMS）是测量短寿命核质量的有力工具。在IMS实验中，通过精确测量储存在环中的离子的旋转时间来确定质量。然而，对于具有几乎相同的质荷比（m/q）的粒子，无法解析旋转时间。为了克服这一限制，并提取精确的旋转时间，这样的离子种类对非常接近的m/q比，在我们的早期工作的粒子识别，我们分析了从检测器的定时信号的幅度的基础上发射的二次电子。在此，通过考虑信号幅度、检测效率和环中存储离子的数量，进一步改进了先前的数据分析方法。在数据分析中引入了一个敏感的Z相关参数，使~（34）Ar~（18+）和~（51）Co~（27+）的分辨率更好，A/Z = 17/9。虽然~（34）Ar~（18+）和~（51）Co~（27+）的时间差仅为1.8ps，但它们的平均公转时间却被推算出来。这些离子的未校正的重叠峰具有7.7ps的半峰全宽。测得~（51）Co的质量过剩为-27，332（41）keV，与以前的-27，342（48）keV值一致。
Isochronous mass spectrometry (IMS) of heavyion storage rings is a powerful tool for the mass measurements of short-lived nuclei. In IMS experiments, masses are determined through precision measurements of the revolution times of the ions stored in the ring. However, the revolution times cannot be resolved for particles with nearly the same mass-to-charge (m/q) ratios. To 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 electrons. Here, 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 = 17/9. The mean revolution times of ~(34)Ar~(18+) and ~(51)Co~(27+) are deduced, although their time difference is merely 1.8 ps. The uncorrected, overlapped peak of these ions has a full width at half maximum of 7.7 ps. The mass excess of ~(51)Co was determined to be -27,332(41) keV, which is in agreement with the previous value of -27,342(48) keV.