High-precision Q$_{EC}$ values of superallowed $0^+ \to$ 0$^+ \beta$-emitters $^{46}$Cr, $^{50}$Fe and $^{54}$Ni

Zhang, P.; Audi, G.; Mao, R. S.; Chen, R. J.; Fu, C. Y.; Yang, J. C.; Sun, Y.; Xing, Y. M.; Liu, D. W.; Kubono, S.; Sun, B. H.; Blaum, K.; Xu, H. S.; Litvinov, S.; Chen, X. C.; Chen, H.; Bao, T.; Zhou, X.; Zhou, X. H.; Xu, X.; Ozawa, A.; He, J. J.; Yuan, Y. J.; Ma, X. W.; Wang, M.; Litvinov, Yury; Zeng, Q.; Lam, Y. H.; Shuai, P.; Xu, F. R.; Zhang, Y. H.; Yamaguchi, T.; Tu, X. L.; Sun, M. Z.; Zhan, W. L.; Uesaka, T.; Yamaguchi, Y.; Yan, X. L.

doi:10.1016/j.physletb.2017.01.039

Journal Article

GSI-2018-00147

High-precision Q$_{EC}$ values of superallowed $0^+ \to$ 0$^+ \beta$-emitters $^{46}$Cr, $^{50}$Fe and $^{54}$Ni

Zhang, P. ; Xu, X. ; Shuai, P. ; Chen, R. J. ; Yan, X. L. ; Zhang, Y. H. ; Wang, M. ; Litvinov, Y.GSI* ; Blaum, K. ; Xu, H. S. ; 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. ; 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.GSI* ; Audi, G. ; Uesaka, T. ; Yamaguchi, Y. ; Yamaguchi, T. ; Ozawa, A. ; Sun, B. H. ; Sun, Y. ; Xu, F. R.

2017
North-Holland Publ. Amsterdam

Physics letters / B 767, 20 - 24 (2017) [10.1016/j.physletb.2017.01.039]

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Please use a persistent id in citations: doi:10.1016/j.physletb.2017.01.039 doi:10.15120/GSI-2018-00147

Abstract: 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 (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.

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ddc:530

Note: Open Access funded by SCOAP³ - Sponsoring Consortium for Open Access Publishing in Particle Physics "Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3."

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