Charge and frequency resolved isochronous mass spectrometry and the mass of 51Co
Charge and frequency resolved isochronous mass spectrometry and the mass of 51Co
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DOI：
10.1016/j.physletb.2014.06.046
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发表时间：
2014-07
影响因子：
4.4
通讯作者：
P. Shuai;Hushan Xu;X. Tu;Yuhu Zhang;B. Sun;Meng Wang;Y. Litvinov;K. Blaum;X. Zhou;
中科院分区：
文献类型：
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作者：
P. Shuai;Hushan Xu;X. Tu;Yuhu Zhang;B. Sun;Meng Wang;Y. Litvinov;K. Blaum;X. Zhou;
储存环中单个离子的旋转频率测量需要复杂的定时探测器。这种检测器的常见方法之一是检测由于所存储的离子的穿透而从薄箔释放的二次电子。提出了一种基于二次电子强度分析的新方法，该方法能够在测量离子旋转频率的同时确定每个离子的电荷。虽然51 Co 27+和34 Ar 18+离子的质荷比几乎相同，因此不能在储存环中分辨，但通过应用新方法，首次确定了短寿命51 Co的质量过剩为ME（Co 51）=− 27 342（48）keV。壳模型计算的fp壳核的新数据相比，表明需要包括同位旋非守恒力。
Revolution frequency measurements of individual ions in storage rings require sophisticated timing detectors. One of common approaches for such detectors is the detection of secondary electrons released from a thin foil due to penetration of the stored ions. A new method based on the analysis of intensities of secondary electrons was developed which enables determination of the charge of each ion simultaneously with the measurement of its revolution frequency. Although the mass-over-charge ratios of 51 Co 27+ and 34 Ar 18+ ions are almost identical, and therefore, the ions cannot be resolved in a storage ring, by applying the new method the mass excess of the short-lived 51 Co is determined for the first time to be ME (Co 51)=− 27 342 (48) keV. Shell-model calculations in the fp-shell nuclei compared to the new data indicate the need to include isospin-nonconserving forces.