The ft value of the superallowed fermi beta decay 26m Al( β + ) 26 Mg

Freeman, Joan M.; Jenkin, J.G.; Murray, G.; Robinson, D.C.; Burcham, W.E.

doi:10.1016/0375-9474(69)90721-0

The ft value of the superallowed fermi beta decay 26m Al( β + ) 26 Mg

1969

18 pages

Published in:

Nucl.Phys.A 132 (1969) 593-610

Published: 1969

DOI:

10.1016/0375-9474(69)90721-0

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Abstract: (Elsevier)

The threshold for the reaction 26 Mg(p, n) 26m Al has been measured in terms of the accurately known energies of the α-particle groups from a ThC source. The result E th = 5208.5 ± 1.7 keV corresponds to a Q -value of −5013.5 ± 1.6 keV. The weighted mean of this and an earlier independent Q -value measurement gives for the end-point in the beta decay 26m Al( β + ) 26 Mg the result 3208.6±1.3 keV. The half-life for the beta decay has been measured as 6.346±0.005 sec. The ft value for the transition is thus found to be 3081±7 sec, including radiative corrections. This result is lower than those for other superallowed Fermi decays. It corresponds to a value for the vector coupling constant G β v = (1.4129±0.0016) x 10 −49 erg · cm 3 . The value inferred for the Cabibbo angle is cos θ β v = 0.985±0.001 , excluding uncertainties in the radiative corrections. This result appears to differ appreciably from the value inferred from the rate of K + → π 0 e + v decay.

RADIOACTIVITY
Nuclear Reaction

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