engZhang, P.Xu, X.Bao, T.Chen, X. C.Chen, H.Fu, C. Y.He, J. J.Kubono, S.Lam, Y. H.Liu, D. W.Mao, R. S.Ma, X. W.Shuai, P.Sun, M. Z.Tu, X. L.Xing, Y. M.Yang, J. C.Yuan, Y. J.Zeng, Q.Zhou, X.Zhou, X. H.Zhan, W. L.Litvinov, S.Chen, R. J.Audi, G.Uesaka, T.Yamaguchi, Y.Yamaguchi, T.Ozawa, A.Sun, B. H.Sun, Y.Xu, F. R.Yan, X. L.Zhang, Y. H.Wang, M.Litvinov, YuryBlaum, K.Xu, H. S.High-precision Q$_{EC}$ values of superallowed $0^+ \to$ 0$^+ \beta$-emitters $^{46}$Cr, $^{50}$Fe and $^{54}$Niinfo:eu-repo/classification/ddc/530Short-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 (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 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 50Fe and 54Ni are by one order of magnitude more precise than the adopted literature values. By combining the existing half-lives and branching ratios, we obtained the corrected Ft values to be Ft(50Fe) = 3103(70) s and Ft(54Ni) = 3076(50) s. The main contribution to the Ft uncertainties is now due to β-decay branching ratios, still, more high-precision measurements of the half-lives, the masses, and especially the branching ratios are needed in order to satisfy the requirements for a stringent CVC test.Physics letters / B 767, 20 - 24 (2017). doi:10.1016/j.physletb.2017.01.039info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionNorth-Holland Publ.2017info:eu-repo/semantics/openAccessDEhttps://repository.gsi.de/record/208764https://repository.gsi.de/search?p=id:%22GSI-2018-00147%22Researchersinfo:eu-repo/semantics/altIdentifier/doi/10.15120/GSI-2018-00147info:eu-repo/semantics/altIdentifier/wos/WOS:000397861700004info:eu-repo/semantics/altIdentifier/doi/10.1016/j.physletb.2017.01.039info:eu-repo/semantics/altIdentifier/issn/1873-2445info:eu-repo/semantics/altIdentifier/issn/0370-2693