Elsevier

Physics Letters B

Volume 767, 10 April 2017, Pages 20-24
Physics Letters B

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

https://doi.org/10.1016/j.physletb.2017.01.039Get rights and content
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Abstract

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 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(Fe50)=3103(70) s and Ft(Ni54)=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.

Keywords

Storage rings
QEC values
Superallowed 0+0+ β-emitters
CVC test

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