Bρ -defined isochronous mass spectrometry: An approach for high-precision mass measurements of short-lived nuclei

Le résumé fourni par la source

A 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 technique, named the $B\ensuremath{\rho}$-defined IMS or $B\ensuremath{\rho}$-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 $^{46}\mathrm{Cr}$, $^{50}\mathrm{Fe}$, and $^{54}\mathrm{Ni}$ are determined with relative uncertainties of (5--6)$\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}8}$, 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.

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