High-precision QEC values of superallowed 0+ → 0+ β-emitters 46Cr, 50Fe and 54Ni
- Chinese Academy of Sciences (CAS), Lanzhou (China). Key Lab. of High Precision Nuclear Spectroscopy, Center for Nuclear Matter Science, and Inst. of Modern Physics; Chinese Academy of Sciences (CAS), Beijing (China). Graduate Univ. of Chinese Academy of Sciences
- Chinese Academy of Sciences (CAS), Lanzhou (China). Key Lab. of High Precision Nuclear Spectroscopy, Center for Nuclear Matter Science, and Inst. of Modern Physics
- Chinese Academy of Sciences (CAS), Lanzhou (China). Key Lab. of High Precision Nuclear Spectroscopy, Center for Nuclear Matter Science, and Inst. of Modern Physics; GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
- Max Planck Inst. fur Kernphysik, Heidelberg (Germany)
- Chinese Academy of Sciences (CAS), Lanzhou (China). Key Lab. of High Precision Nuclear Spectroscopy, Center for Nuclear Matter Science, and Inst. of Modern Physics; Chinese Academy of Sciences (CAS), Beijing (China). Key Lab. of Optical Astronomy
- Chinese Academy of Sciences (CAS), Lanzhou (China). Key Lab. of High Precision Nuclear Spectroscopy, Center for Nuclear Matter Science, and Inst. of Modern Physics; Max Planck Inst. fur Kernphysik, Heidelberg (Germany)
- Chinese Academy of Sciences (CAS), Lanzhou (China). Key Lab. of High Precision Nuclear Spectroscopy, Center for Nuclear Matter Science, and Inst. of Modern Physics; Univ. of Science and Technology of China, Hefei (China)
- GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
- Univ. of Paris-Sud, Orsay (France). Centre for Nuclear Science and Matter Sciences (CSNSM)
- RIKEN, Saitama (Japan). Nishina Center
- Saitama Univ., Saitama (Japan). Dept. of Physics
- Univ. of Tsukuba (Japan). Inst. of Physics
- Beihang Univ., Beijing (China). School of Physics and Nuclear Energy Engineering
- Shanghai Jiao Tong Univ. (China). Dept. of Physics and Astronomy
- Peking Univ., Beijing (China). School of Physics, State Key Lab. of Nuclear Physics and Technology
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(46Cr) =7604(11) keV, QEC(50Fe) =8150(6) keV and QEC(54Ni) =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.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); Imperial College, London (United Kingdom); National Basic Research Program of China(973 Program); National Key Program for S&T Research and Development (China); National Natural Science Foundation (NSFC) (China); Chinese Academy of Sciences; Helmholtz–CAS Joint Research Group (Germany); Nuclear Astrophysics Virtual Institute (NAVI) (Germany)
- Grant/Contract Number:
- AC02-05CH11231; 2013CB834401; U1232208; U1432125; 11205205; 11035007; 11235001; 11320101004; 11575007; 11575112; 11135005; 2016VMA043
- OSTI ID:
- 1422734
- Journal Information:
- Physics Letters B, Vol. 767, Issue C; ISSN 0370-2693
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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