$B\rho$-defined isochronous mass spectrometry: a new approach for high-precision mass measurements of short-lived nuclei

Abstract

A novel technique for broadband high-precision mass measurements of short-lived exotic nuclides is reported. It is based on the isochronous mass spectrometry (IMS) and realizes simultaneous determinations of revolution time and velocity of short-lived stored ions at the cooler storage ring CSRe in Lanzhou. The new technique, named as the $B\rho$-defined IMS or $B\rho$-IMS, boosts the efficiency, sensitivity, and accuracy of mass measurements, and is applied here to measure masses of neutron-deficient $fp$-shell nuclides. In a single accelerator setting, masses of ${}^{46}$Cr, ${}^{50}$Fe and ${}^{54}$Ni are determined with relative uncertainties of (5~-~6)$\times 10^{-8}$, thereby improving the input data for testing the unitarity of the Cabibbo-Kobayashi-Maskawa quark mixing matrix. This is the technique of choice for future high-precision measurements of the most rarely produced shortest-lived nuclides.

8 pages, 4 figures

References in corpus (6)

• All the Fun of the FAIR: Fundamental physics at the Facility for Antiproton and Ion Research
• Mass measurements of 99-101In challenge ab initio nuclear theory of the nuclide 100Sn
• Identification of the Lowest $T=2$, $J^{\pi =}{0}^{+}$ Isobaric Analog State in ${}^{52}$Co and Its Impact on the Understanding of $\beta$-Decay Properties of ${}^{52}$Ni
• Nuclear Mass Measurements Map the Structure of Atomic Nuclei and Accreting Neutron Stars
• High-precision mass measurement of ${}^{56}$Cu and the redirection of the rp-process flow
• Particle identification and revolution time corrections for the isochronous mass spectrometry in storage rings