1 - IAEA Nuclear Data Services

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our e-X-coincidence method ("33] to a, = 0.092. A first
preliminary result of the branching to the ground state
is 5.1%. The final results, which are under calculation,
will yield a few tenths of a percent accuracy on all
branchings.
5.3.4-. Decay of ^ 8 Co
V. Bambynek, E. De Roost, E. Eunck +
Co-58 sources were prepared by evaporation and electrodeposition
and measured with several methods. Promising
results were obtained for the EC/p + and the Y-branching
ratios, especially with the 4-TT- pressure, the coincidence
and the Ge(Li) counters.
5.3.5. Decay of 7 Be
E. De Roost, A. Spernol, W. van der Eijk, R. Vaninbroukx
Measurements of the branching-ratio of 'Be have been
prepared. The possible methods for preparation of
thinnest sources are under investigation. Disturbances
from recoils and secondary processes have been estimated
and have to be checked experimentally.
5.3.6. EG/p* ratios
E. Eunck , A. Spernol
A new series of EC/p determinations has been started,
with extreme attention to second order effects as -y-efficiency
of the p-counters, second order modes of annihilation,
intervention of atomic shell effects in
p-decay, etc.
6. Isotope Standards of Stable and Fissile Nuclides
6.1. Boron
P.J. De Bièvre, G.H. Debus
Certified standard boron samples in the form of boric
+ Research Eellow EURATOM