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Article
Title	Precise half-life measurements for $^{38}$Ca and $^{39}$Ca
Author(s)	Blank, B (CENBG, Gradignan) ; Giovinazzo, J (CENBG, Gradignan) ; Demonchy, C-E (CENBG, Gradignan) ; Borge, M J G (Madrid, Inst. Estructura Materia) ; Matea, I (CENBG, Gradignan) ; Munoz, F (CENBG, Gradignan) ; Huikari, J (CENBG, Gradignan) ; Dominguez-Reyes, R (Madrid, Inst. Estructura Materia) ; Plaisir, C (CENBG, Gradignan) ; Sturm, S (Mainz U.) ; Canchel, G (CENBG, Gradignan) ; Delahaye, P (CERN) ; Audirac, L (CENBG, Gradignan) ; Fraile, L M (Madrid U.) ; Serani, L (CENBG, Gradignan) ; Lunney, D (U. Paris-Sud 11) ; Pedroza, J-L (CENBG, Gradignan) ; Bey, A (CENBG, Gradignan) ; Souin, J (CENBG, Gradignan) ; Hui, Tran Trong (CENBG, Gradignan) ; Delalee, F (CENBG, Gradignan) ; Tengblad, O (Madrid, Inst. Estructura Materia) ; Wenander, F (CERN)
Publication	2010
In:	Eur. Phys. J. A 44 (2010) 363-372
DOI	10.1140/epja/i2010-10958-2
Subject category	Nuclear Physics - Experiment
Abstract	The half-lives of Ca-38 and Ca-39 have been measured at ISOLDE of CERN. The REXTRAP facility was used to prepare ultra-clean samples of radioactive nuclei for precision decay spectroscopy. Ca-38 is one of the T-z = -1, 0(+). 0(+) beta-emitting nuclides used to determine the vector coupling constant of the weak interaction and the V-ud quark-mixing matrix element. The result obtained, T-1/2 = 443.8(19) ms, is four times more precise than the average of previous measurements. For Ca-39, a half-life of T-1/2 = 860.7(10) ms is obtained, a result in agreement with the average value from the literature.