This work details an application of collinear resonance ionization
spectroscopy for the separation of short-lived isomeric states and
their subsequent study with decay spectroscopy. It reports
the successful construction of a novel decay spectroscopy
apparatus that can operate at pressures below 1 x 10^-9 mbar. The
method is demonstrated by separating the nuclear ground and
isomeric states of 204Fr and performing alpha-decay spectroscopy.
An equivalent mass spectrometer would require 4.6 million times as
much resolution to achieve the same result. This work unambiguously
confirms the existence of a second isomeric state in 204Fr. The
author also demonstrates the effectiveness of this method for laser
spectroscopy and identification of hyperfine-structure components
with energy tagging. This method was successfully used in 202Fr to
identify ground and isomeric states. The measurement of 202Fr
reported in this thesis demonstrates a factor of 100 improvement in
sensitivity compared to state-of-the-art fluorescence techniques.
The work reported in this thesis won the author the IOP Nuclear
Physics Group Early Career Prize.
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