Precise measurements of half-lives and branching ratios for the ββ mirror transitions in the decay of 23Mg and 27Si
Magron, C., Alfaurt, P., Blank, B., Daudin, L., Eronen, T., Gerbaux, M., . . . Xayavong, L. (2017). Precise measurements of half-lives and branching ratios for the ββ mirror transitions in the decay of 23Mg and 27Si. European Physical Journal A, 53 (4), 77. doi:10.1140/epja/i2017-12271-0
Published inEuropean Physical Journal A
© Societa Italiana di Fisica / Springer-Verlag 2017. This is a final draft version of an article whose final and definitive form has been published by Springer. Published in this repository with the kind permission of the publisher.
Half-lives and branching ratios for the two mirror ββ decays of 23Mg and 27Si have been measured at the University of Jyväskylä with the IGISOL facility. The results obtained, T1/2=11.303(3)T1/2=11.303(3) s and T1/2=4.112(2)T1/2=4.112(2) s for the half-lives of 23Mg and 27Si , respectively, are 7 and 8 times more precise than the averages of previous measurements. The values obtained for the super-allowed branching ratios of 23Mg and 27Si are B.R.=92.18(8)%B.R.=92.18(8)% and B.R.=99.74(2)%B.R.=99.74(2)% , respectively. The result for 23Mg is three times more precise than the average of the previous measurements, while for 27Si the precision has not been improved, the average of the previous measurements being already very precise. Isospin-symmetry-breaking corrections have been calculated for the two nuclei to determine the corrected FtFt value.