Speaker
Description
Accurate nuclear masses not only provide indispensable information on nuclear structure, but also deliver important input data for applications in nuclear astrophysics. The challenge today is to obtain accurate masses of nuclei located far away from the valley of stability. Recently, we have developed a brand new technique, the Brho-defined isochronous mass spectrometry (IMS), at the cooler storage ring CSRe in Lanzhou. Using the simultaneously determined revolution times and velocities of the stored ions, the relation between ions’ magnetic rigidities and orbit lengths is established, allowing to determine the magnetic rigidity of any stored ion according to its orbit length. Consequently, m/q values of the unknown-mass nuclides are determined. High mass resolving power has been achieved covering a large m/q-range over the full Brho-acceptance of the storage ring, starting a new era of the IMS. By using the Brho-defined IMS, the masses of 70Kr, 66Se, 64As, 62Ge, 23Si, 26P, 27S, 31Ar were measured for the first time and the mass precision was improved for some other nuclides. The new mass results were used to study relevant problems in nuclear structure and astrophysics [1,2,3].
1. X. Zhou et al., Nature Physics 19, 1091–1097 (2023)
2. M. Wang et al., Phys. Rev. Lett. 130, 192501 (2023)
3. Y. Yu et al., Phys. Rev. Lett. 133, 222501 (2024)
