Mass Measurement of Short-lived Nuclei at HIRFL-CSR

Abstract

Abstract. Four campaigns of mass measurements for short-lived nuclei have been conducted using an isochronous mass spectrometry (IMS) technique at HIRFL-CSR (Cooler Storage Ring) in Lanzhou. The radioactive nuclei were produced by projectile fragmentation and injected into the experimental storage ring CSRe. Revolution times of the ions stored in the CSRe were measured from which masses of 78 Kr, 58 Ni, 86 Kr and 112 Sn fragments have been determined with a relative uncertainty of about 10 -6 -10 -7 . The experimental results are presented and their impacts on nucleosynthesis in the rp process and nuclear structure are discussed.

The 2012 Atomic Mass Evaluation and Future

“…This kind of treatment is suitable for most of the mass measurements, and found some problems with measurements containing strong correlations. For example, in mass measurements with a storage ring [22], a large numbers of nuclides are stored in the ring and measured simultaneously. The nuclear masses of interest are deduced by using a bunch of nuclides as references.…”