High-precision QEC values of superallowed 0+→ 0+ β-emitters 46Cr, 50Fe and 54Ni

Abstract

Superallowed 0 + 0 + -emitters CVC test Short-lived 46 Cr, 50 Fe and 54 Ni were studied by isochronous mass spectrometry at the HIRFL-CSR facility in Lanzhou. The measured precision mass excesses (M E) of 46 Cr, 50 Fe and 54 Ni are -29471(11) keV, -34477(6) keV and -39278(4) keV, respectively. The superallowed 0 + 0 + -decay Q values were derived to be Q EC ( 46 Cr) = 7604(11) keV, Q EC ( 50 Fe) = 8150(6) keV and Q EC ( 54 Ni) = 8731(4) keV. The values for 50 Fe and 54 Ni are by one order of magnitude more precise than the adopted literature values.