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Title: High-precision Q EC values of superallowed 0 + → 0 + β-emitters 46Cr, 50Fe and 54Ni

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 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.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [3] ;  [4] ;  [2] ;  [2] ;  [2] ;  [1] ;  [1] ;  [5] ;  [2] ;  [2] ;  [1] ;  [2] ;  [2] more »;  [1] ;  [6] ;  [1] ;  [2] ;  [2] ;  [7] ;  [1] ;  [2] ;  [2] ;  [8] ;  [9] ;  [10] ;  [10] ;  [11] ;  [12] ;  [13] ;  [14] ;  [15] « less
  1. 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
  2. Chinese Academy of Sciences (CAS), Lanzhou (China). Key Lab. of High Precision Nuclear Spectroscopy, Center for Nuclear Matter Science, and Inst. of Modern Physics
  3. 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)
  4. Max Planck Inst. fur Kernphysik, Heidelberg (Germany)
  5. 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
  6. 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)
  7. 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)
  8. GSI-Helmholtzzentrum fur Schwerionenforschung, Darmstadt (Germany)
  9. Univ. of Paris-Sud, Orsay (France). Centre for Nuclear Science and Matter Sciences (CSNSM)
  10. RIKEN, Saitama (Japan). Nishina Center
  11. Saitama Univ., Saitama (Japan). Dept. of Physics
  12. Univ. of Tsukuba (Japan). Inst. of Physics
  13. Beihang Univ., Beijing (China). School of Physics and Nuclear Energy Engineering
  14. Shanghai Jiao Tong Univ. (China). Dept. of Physics and Astronomy
  15. Peking Univ., Beijing (China). School of Physics, State Key Lab. of Nuclear Physics and Technology
Publication Date:
Grant/Contract Number:
AC02-05CH11231; 2013CB834401; U1232208; U1432125; 11205205; 11035007; 11235001; 11320101004; 11575007; 11575112; 11135005; 2016VMA043
Type:
Accepted Manuscript
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 767; Journal Issue: C; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
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)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; Storage rings; values; QEC values; Superallowed 0+ → 0+; β-emitters; CVC test
OSTI Identifier:
1422734

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., and Xu, F. R.. High-precision QEC values of superallowed 0+ → 0+ β-emitters 46Cr, 50Fe and 54Ni. United States: N. p., Web. doi:10.1016/j.physletb.2017.01.039.
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.. High-precision QEC values of superallowed 0+ → 0+ β-emitters 46Cr, 50Fe and 54Ni. United States. doi:10.1016/j.physletb.2017.01.039.
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., and Xu, F. R.. 2017. "High-precision QEC values of superallowed 0+ → 0+ β-emitters 46Cr, 50Fe and 54Ni". United States. doi:10.1016/j.physletb.2017.01.039. https://www.osti.gov/servlets/purl/1422734.
@article{osti_1422734,
title = {High-precision QEC values of superallowed 0+ → 0+ β-emitters 46Cr, 50Fe and 54Ni},
author = {Zhang, P. and Xu, X. and Shuai, P. and Chen, R. J. and Yan, X. L. and Zhang, Y. H. and Wang, M. and Litvinov, Yu. A. and Blaum, K. and Xu, H. S. and Bao, T. and Chen, X. C. and Chen, H. and Fu, C. Y. and He, J. J. and Kubono, S. and Lam, Y. H. and Liu, D. W. and Mao, R. S. and Ma, X. W. and Sun, M. Z. and Tu, X. L. and Xing, Y. M. and Yang, J. C. and Yuan, Y. J. and Zeng, Q. and Zhou, X. and Zhou, X. H. and Zhan, W. L. and Litvinov, S. and Audi, G. and Uesaka, T. and Yamaguchi, Y. and Yamaguchi, T. and Ozawa, A. and Sun, B. H. and Sun, Y. and Xu, F. R.},
abstractNote = {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.},
doi = {10.1016/j.physletb.2017.01.039},
journal = {Physics Letters. Section B},
number = C,
volume = 767,
place = {United States},
year = {2017},
month = {1}
}