1 - IAEA Nuclear Data Services
1 - IAEA Nuclear Data Services
1 - IAEA Nuclear Data Services
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5.3. Determination of <strong>Nuclear</strong> Constants<br />
5.3.1. The Fluorescence Yield of Cr<br />
W. Bambynek<br />
The remeasurement of the fluorescence yield of Cr<br />
using the ^nn-decay and several independent counting<br />
methods was completed. The result (0.2793) is<br />
accurate to within a few tenths of a percent and<br />
shows definitely that the values, at present used,<br />
are about 20% lower than the real ones. Fluorescence<br />
65<br />
yield determinations have been started on ^Zn. The<br />
prepared evaporated sources show promising properties<br />
and first measurements give very satisfactory results<br />
(Wk = 0.433). Measurements on Y are under preparation<br />
T30],[31].<br />
5.3.2. Decay Scheme of 60 Co<br />
H. Hansen, A. Spernol<br />
In the presently accepted decay scheme of Co a level<br />
of 2.16 MeV of the daughter nucleus Ni predicted by<br />
the theory, is missing. A p-spectrometer investigation<br />
showed that this level is populated by about 0.15% of<br />
the decays. The subsequent Y-radiation of 0.823 MeV<br />
was also detected in long term (10 days) Ge(Li)-measurements<br />
with about the same intensity. The other<br />
low intensity p-decays were also accurately determined.<br />
Some theoretical conclusions could be drawn from this<br />
new experimental result [32].<br />
5-3.3. Decay of 137 Cs<br />
H. Hansen, G. Lowenthal + , A. Spernol, W. van der Eijk,<br />
R. Vaninbroukx<br />
The decay scheme of -^'Cs was redetermined using as<br />
many as possible methods. The (p+e)/Y ratio has been<br />
determined by 4TT-, liquid scintillation and ^-spectrometer<br />
measurements to 1.288 _+ 0.2%, the e/Y ratio by<br />
Guest from A.A.E.C,