G M Lewis 1955 Proc. Phys. Soc. A 68 735 doi:10.1088/0370-1298/68/8/311
G M Lewis
Show affiliationsThe lifetime of the 46.5 keV excited state following β-decay of RaD has been shown, by delayed coincidence methods, to be less than 3 × 10-9 sec; this specifies the 46.5 keV transition to be a dipole one. An investigation of the scintillations from an activated sodium iodide crystal containing RaD has determined the complete integrated spectrum of RaD, free from effects of source absorption. This spectrum consists in the main of a single peak, and indicates directly that at least 90% of the disintegrations involve soft β-decay to the 46.5 keV excited state followed by rapid de-excitation. Less than 5% of the disintegrations pass through metastable states. The β-decay is briefly discussed.
23.40.Hc Relation with nuclear matrix elements and nuclear structure
Issue 8 (1 August 1955)
Received 16 February 1955
G M Lewis 1955 Proc. Phys. Soc. A 68 735
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