Bρ-defined isochronous mass spectrometry and mass measurements of 58 Ni fragments

M. Zhang, X. Zhou, M. Wang*, Y. H. Zhang*, Yu A. Litvinov*, H. S. Xu, R. J. Chen, H. Y. Deng, C. Y. Fu, W. W. Ge, H. F. Li, T. Liao, S. A. Litvinov, P. Shuai, J. Y. Shi, R. S. Sidhu, Y. N. Song, M. Z. Sun, S. Suzuki, Q. WangY. M. Xing, X. Xu, T. Yamaguchi, X. L. Yan, J. C. Yang, Y. J. Yuan, Q. Zeng, X. H. Zhou

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


A novel isochronous mass spectrometry, termed as Bρ-defined IMS, has been established at the experimental cooler-storage ring CSRe in Lanzhou. Its potential has been studied through high precision mass measurements of 58Ni projectile fragments. Two time-of-flight detectors were installed in one of the straight sections of CSRe, thus enabling simultaneous measurements of the velocity and the revolution time of each stored short-lived ion. This allows for calculating the magnetic rigidity Bρ and the orbit length C of each ion. The accurate Bρ(C) function has been constructed, which is a universal calibration curve used to deduce the masses of the stored nuclides. The sensitivity to single stored ions, fast measurement time, and background-free characteristics of the method are ideally suited to address nuclides with very short lifetimes and smallest production yields. In the limiting case of just a single particle, the achieved mass resolving power allows one to determine its mass-over-charge ratio m/q with a remarkable precision of merely ∼5 keV. Masses of Tz=−3/2 fp-shell nuclides are re-determined with high accuracy, and the validity of the isospin multiplet mass equation is tested up to the heaviest isospin quartet with A=55. The new masses are also used to investigate the mirror symmetry of empirical residual proton-neutron interactions.
Original languageEnglish
Article number27
Pages (from-to)1-16
Number of pages16
JournalThe European Physical Journal A (EPJ A)
Publication statusPublished - 14 Feb 2023


  • nucl-ex


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