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Physical Review C 85 (2012) 055501
High-precision branching-ratio measurement for the superallowed β+ emitter $^{26}$Al$^{m}$
P. Finlay, G.C. Ball, J.R. Leslie, C.E. Svensson, C. Andreoiu, R.A.E. Austin, D. Bandyopadhyay, D.S. Cross, G. Demand, M. Djongolov, S. Ettenauer, P.E. Garrett, K.L. Green, G.F. Grinyer1, G. Hackman, K.G. Leach, C.J. Pearson, A.A. Phillips, E.T. Rand, C.S. Sumithrarachchi, S. Triambak, S.J. Williams
(2012)

A high-precision branching-ratio measurement for the superallowed β + emitter 26Alm was performed at the TRIUMF-ISAC radioactive ion beam facility. An upper limit of 12 ppm at 90% confidence level was found for the second forbidden β + decay of 26Alm to the 2+ 1 state at 1809 keV in 26Mg. An inclusive upper limit of 15 ppm at 90% confidence level was found when considering all possible nonanalog β + /EC decay branches of 26Alm, resulting in a superallowed branching ratio of 100.0000+0 −0.0015%.
1:  GANIL - Grand Accélérateur National d'Ions Lourds
Physics/Nuclear Experiment