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Short-lived 46Cr, 50Fe and 54Ni were studied by isochronous mass spectrometry at the HIRFL-CSR facility in Lanzhou. The measured precision mass excesses (ME) of 46Cr, 50Fe and 54Ni are −29471(11) keV, −34477(6) keV and −39278(4) keV, respectively. The superallowed 0+→0+ β-decay Q values were derived to be QEC(Cr46)=7604(11) keV, QEC(Fe50)=8150(6) keV and QEC(Ni54)=8731(4) keV. The values for 50Fe...
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