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

被引：38

作者：

Zhang, R. ^{[1
]}

Xu, X. ^{[1
]}

Shuai, P. ^{[1
]}

Chen, R. J. ^{[1
]}

Yan, X. L. ^{[1
]}

Zhang, Y. H. ^{[1
]}

Wang, M. ^{[1
]}

Litvinov, Yu. A. ^{[1
,3
]}

Blaum, K. ^{[4
]}

Xu, H. S. ^{[1
]}

Bao, T. ^{[1
]}

Chen, X. C. ^{[1
]}

Chen, H. ^{[1
,2
]}

Fu, C. Y. ^{[1
,2
]}

He, J. J. ^{[1
,5
]}

Kubono, S. ^{[1
]}

Lam, Y. H. ^{[1
]}

Liu, D. W. ^{[1
,2
]}

Mao, R. S. ^{[1
]}

Ma, X. W. ^{[1
]}

Sun, M. Z. ^{[1
,2
]}

Tu, X. L. ^{[1
,4
]}

Xing, Y. M. ^{[1
,2
]}

Yang, J. C. ^{[1
]}

Yuan, Y. J. ^{[1
]}

Zeng, Q. ^{[1
,6
]}

Zhou, X. ^{[1
,2
]}

Zhou, X. H. ^{[1
]}

Zhan, W. L. ^{[1
]}

Litvinov, S. ^{[3
]}

Audi, G. ^{[7
]}

Uesaka, T. ^{[8
]}

Yamaguchi, Y. ^{[8
]}

Yamaguchi, T. ^{[9
]}

Ozawa, A. ^{[10
]}

Sun, B. H. ^{[11
]}

Sun, Y. ^{[12
]}

Xu, F. R. ^{[13
]}

机构：

[1] Chinese Acad Sci, Ctr Nucl Matter Sci, Inst Modern Phys, Key Lab High Precis Nucl Spect, Lanzhou 730000, Peoples R China

[2] Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China

[3] GSI Helmholtzzentrum Schwerionenforschung, Planckstr 1, R-64291 Darmstadt, Germany

[4] Max Planck Inst Kernphys, Saupfercheckweg 1, D-69117 Heidelberg, Germany

[5] Chinese Acad Sci, Key Lab Opt Astron Natl Astron Observ, Beijing 100012, Peoples R China

[6] Univ Sci & Technol China, Hefei 230026, Peoples R China

[7] Univ Paris Saclay, Univ Paris Sud, CNRS, CSNSM,IN2P3, F-91405 Orsay, France

[8] RIKEN, Nishina Ctr, Saitama 3510198, Japan

[9] Saitama Univ, Dept Phys, Saitama 3388570, Japan

[10] Univ Tsukuba, Inst Phys, Ibaraki 3058571, Japan

[11] Beihang Univ, Sch Phys & Nucl Energy Engn, Beijing 100191, Peoples R China

[12] Shanghai Jiao Tong Univ, Dept Phys & Astron, Shanghai 200240, Peoples R China

[13] Peking Univ, Sch Phys, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China

来源：

PHYSICS LETTERS B | 2017年 / 767卷

关键词：

Storage rings; Q(EC) values; Superallowed 0(+) -> 0(+) beta-emitters; CVC test; ISOCHRONOUS MASS-SPECTROMETRY; PROTON-RICH NUCLEI; CHARGE;

D O I：

10.1016/j.physletb.2017.01.039

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：20 / 24

页数：5

共 4 条

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