$B\rho$-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.

arXiv comment8 pages, 4 figures

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Cited by in corpus (4)

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• Iso-scalar liquid drop model
• Schottky detection techniques for ultra-rare short-lived ions in heavy ion storage rings