학술논문
High-precision QEC values of superallowed 0+→0+ β-emitters 46Cr, 50Fe and 54Ni
Document Type
article
Author
P. Zhang; X. Xu; P. Shuai; R.J. Chen; X.L. Yan; Y.H. Zhang; M. Wang; Yu.A. Litvinov; K. Blaum; H.S. Xu; T. Bao; X.C. Chen; H. Chen; C.Y. Fu; J.J. He; S. Kubono; Y.H. Lam; D.W. Liu; R.S. Mao; X.W. Ma; M.Z. Sun; X.L. Tu; Y.M. Xing; J.C. Yang; Y.J. Yuan; Q. Zeng; X. Zhou; X.H. Zhou; W.L. Zhan; S. Litvinov; G. Audi; T. Uesaka; Y. Yamaguchi; T. Yamaguchi; A. Ozawa; B.H. Sun; Y. Sun; F.R. Xu
Source
Physics Letters B, Vol 767, Iss C, Pp 20-24 (2017)
Subject
Language
English
ISSN
0370-2693
1873-2445
1873-2445
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.