Journal
PHYSICS LETTERS B
Volume 767, Issue -, Pages 20-24Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2017.01.039
Keywords
Storage rings; Q(EC) values; Superallowed 0(+) -> 0(+) beta-emitters; CVC test
Funding
- Major State Basic Research Development Program of China [2013CB834401]
- National Key Program for S&T Research and Development [2016YFA0400504]
- NSFC [U1232208, U1432125, 11205205, 11035007, 11235001, 11320101004, 11575007, 11575112, 11135005]
- Chinese Academy of Sciences
- Helmholtz-CAS Joint Research Group [HCJRG-108]
- CAS President's International Fellowship Initiative Grant [2016VMA043]
- Nuclear Astrophysics Virtual Institute (NAVI) of the Helmholtz Association
- CAS Light of West China Program
- Grants-in-Aid for Scientific Research [16K13799, 17H01123, 26287036] Funding Source: KAKEN
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Short-lived Cr-46, Fe-50 and Ni-54 were studied by isochronous mass spectrometry at the HIRFL-CSR facility in Lanzhou. The measured precision mass excesses (ME) of Cr-46, Fe-50 and Ni-54 are -29471(11) keV, -34477(6) keV and -39278(4) keV, respectively. The superallowed 0(+) -> 0(+) beta-decay Q values were derived to be Q(EC)(Cr-46) = 7604(11) keV, Q(EC)(Fe-50) = 8150(6) keV and Q(EC)(Ni-54) = 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(Fe-50) = 3103(70) s and Ft(Ni-54) = 3076(50) s. The main contribution to the Ft uncertainties is now due to beta-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. (C) 2017 The Authors. Published by Elsevier B.V.
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