Progress of mass measurements of short-lived nuclides at the heavy-ion storage ring in Lanzhou

Abstract Recent commissioning of the Cooler Storage Ring at the Heavy Ion Research Facility in Lanzhou enabled us to conduct high-precision nuclear mass measurements at the Institute of Modern Physics in Lanzhou (IMP). In the past few years, mass measurements were performed using the storage-ring-based isochronous mass spectrometry (IMS) via the fragmentation of the energetic 36Ar, 40Ar, 58Ni, 78Kr, 86Kr, and 112Sn projectiles. Masses of short-lived nuclides on both sides of the -stability line have been measured. Relative mass precisions of 106 107 are routinely achieved and some issues in the studies of nuclear structure and nuclear astrophysics have been addressed [1-8]. In this seminar, the techniqual details and experimental results are presented, and recent progress and some preliminary results are briefly introduced. The IMS with double ToF detectors for velocity measurements are also developed in CSRe, the future experiments using this double ToF IMS are discussed. References: [1] B. Mei et al., NIM A 624, 109 (2010) [2] X. L. Tu et al., PRL 106, 112501 (2011) [3] X. L. Tu et al., NIM A 654, 213 (2011) [4] Y. H. Zhang et al. PRL 109, 102501 (2012) [5] X. L. Yan et al. ApJL 766, L8 (2013) [6] P. Shuai et al., PLB 735, 327 (2014) [7] X. Xu et al., PRL 117, 182503 (2016) [8] P. Zhang et al., PLB 767, 20 (2017)