Precision half-life determination of a mirror β transition: The decay of 31S A. Bacquias, T. Kurtukian-Nieto, P. Ascher, L. Audirac, J. Äystö, B. Blank, V. -V. Elomaa, T. Eronen, J. Giovinazzo, J. Hakala et al. (10 more) Eur. Phys. J. A, 48 11 (2012) 155 Published online: 19 November 2012 DOI: 10.1140/epja/i2012-12155-9