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

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

doi:10.1016/j.physletb.2017.01.039

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

Journal Article · Mon Jan 23 00:00:00 EST 2017 · Physics Letters B

DOI:https://doi.org/10.1016/j.physletb.2017.01.039· OSTI ID:1422734

Zhang, P. ^[1]; Xu, X. ^[2]; Shuai, P. ^[2]; Chen, R. J. ^[2]; Yan, X. L. ^[2]; Zhang, Y. H. ^[2]; Wang, M. ^[2]; Litvinov, Yu. A. ^[3]; Blaum, K. ^[4]; Xu, H. S. ^[2]; Bao, T. ^[2]; Chen, X. C. ^[2]; Chen, H. ^[1]; Fu, C. Y. ^[1]; He, J. J. ^[5]; Kubono, S. ^[2]; Lam, Y. H. ^[2]; Liu, D. W. ^[1]; Mao, R. S. ^[2]; Ma, X. W. ^[2] more »

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 Q_EC(₄₆Cr) =7604(11) keV, Q_EC(₅₀Fe) =8150(6) keV and Q_EC(₅₄Ni) =8731(4) keV. The values for⁵⁰Fe 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.

View Accepted Manuscript (DOE)

Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: Chinese Academy of Sciences; Helmholtz–CAS Joint Research Group (Germany); 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); Nuclear Astrophysics Virtual Institute (NAVI) (Germany); USDOE Office of Science (SC)

Grant/Contract Number:: AC02-05CH11231

OSTI ID:: 1422734

Journal Information:: Physics Letters B, Journal Name: Physics Letters B Journal Issue: C Vol. 767; ISSN 0370-2693

Publisher:: ElsevierCopyright Statement

Country of Publication:: United States

Language:: English

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