beta-decay spectrum

beta-decay spectrum

[′bād·ə di′kā ‚spek·trəm]
(nuclear physics)
The distribution in energy or momentum of the beta particles arising from a nuclear disintegration process.
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Factoring in both the positional dependence of the effciency and the beta-decay spectrum of the electrons, we obtain a detection effciency of (48 [+ or -] 6) % when photomultiplier tube (PMT) threshold levels are set to three or more photoelectrons (see Ref.
However, this tail end of the tritium beta-decay spectrum has a puzzling feature.
Koonin of the California Institute of Technology in Pasadena has now shown that electrons surrounding an atomic nucleus have a discernible but hitherto overlooked effect on a given radioactive isotope's beta-decay spectrum.