High-precision half-life measurements of the T=1/2 mirror β decays 17F and 33Cl

被引：7

作者：

Grinyer, J. ^{[1
]}

Grinyer, G. F. ^{[1
]}

Babo, M. ^{[1
]}

Bouzomita, H. ^{[1
]}

Chauveau, P. ^{[1
]}

Delahaye, P. ^{[1
]}

Dubois, M. ^{[1
]}

Frigot, R. ^{[1
]}

Jardin, P. ^{[1
]}

Leboucher, C. ^{[1
]}

Maunoury, L. ^{[1
]}

Seiffert, C. ^{[2
]}

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

Traykov, E. ^{[1
,3
]}

机构：

[1] CEA, GANIL, DSM, CNRS,IN2P3, F-14076 Caen, France

[2] CERN, ISOLDE, CH-1211 Geneva 23, Switzerland

[3] Univ Strasbourg, CNRS, IN2P3, IPHC, F-67037 Strasbourg, France

来源：

PHYSICAL REVIEW C | 2015年 / 92卷 / 04期

关键词：

LIVES; EMITTERS;

D O I：

10.1103/PhysRevC.92.045503

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

Background: Measurements of the f t values for T = 1/2 mirror beta(+) decays offer a method to test the conserved vector current hypothesis and to determine V-ud, the up-down matrix element of the Cabibbo-Kobayashi-Maskawa matrix. In mostmirror decays used for these tests, uncertainties in the f t values are dominated by the uncertainties in the half-lives. Purpose: Two precision half-life measurements were performed for the T = 1/2 beta(+) emitters, F-17 and Cl-33, in order to eliminate the half-life as the leading source of uncertainty in their f t values. Method: Half-lives of F-17 and Cl-33 were determined using beta counting of implanted radioactive ion beam samples on a moving tape transport system at the Systeme de Production d'Ions Radioactifs Acceleres en Ligne low-energy identification station at the Grand Accelerateur National d'Ions Lourds. Results: The F-17 half-life result, 64.347 (35) s, precise to +/- 0.05%, is a factor of 5 times more precise than the previous world average. The half-life of Cl-33 was determined to be 2.5038 (22) s. The current precision of +/- 0.09% is nearly 2 times more precise compared to the previous world average. Conclusions: The precision achieved during the present measurements implies that the half-life no longer dominates the uncertainty of the f t values for both T = 1/2 mirror decays F-17 and Cl-33.

引用

页数：7

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