Precise half-life measurement for the superallowed 0(+)-->0(+) beta emitter (74)Rb: first results from the new radioactive beam facility (ISAC) at TRIUMF. Academic Article uri icon


  • Presently, the world data for superallowed beta decay leads to a result in disagreement (at the 98% confidence level) with the predictions of the minimal standard model for the unitarity of the Cabibbo-Kobayashi-Maskawa matrix. Precise data for the superallowed 0(+)-->0(+) beta decay of (74)Rb would provide a critical test of the nucleus-dependent isospin symmetry-breaking corrections that must be calculated for these superallowed Fermi beta decays. The present work reports the first precise measurement of the half-life for (74)Rb ( t(1/2) = 64.761+/-0.031 ms). The data were obtained at the radioactive beam facility (ISAC) at TRIUMF using a beam of approximately 4000 (74)Rb ions s(-1).

published proceedings

  • Phys Rev Lett

author list (cited authors)

  • Ball, G. C., Bishop, S., Behr, J. A., Boisvert, G. C., Bricault, P., Cerny, J., ... Towner, I. S.

citation count

  • 46

complete list of authors

  • Ball, GC||Bishop, S||Behr, JA||Boisvert, GC||Bricault, P||Cerny, J||D'Auria, JM||Dombsky, M||Hardy, JC||Iacob, V||Leslie, JR||Lindner, T||Macdonald, JA||Mak, HB||Moltz, DM||Powell, J||Savard, G||Towner, IS

publication date

  • February 2001