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Trap-assisted decay spectroscopy
The aim of trap-assisted spectroscopy is to perform decay spectroscopy with ultra pure samples. This is e.g. needed for high-precision measurements in weak-interaction studies like the measurements of the half-life and the branching ratios of super-allowed 0+ -> 0+ 
decays to test the conserved vector current hypothesis and to determine the Vud matrix element of the CKM quark mixing matrix. In these measurements, the radioactive samples are accumulated in a Penning trap, purified and finally ejected toward a measurement station. Penning traps can also trap the daughter products and as such offer access to species otherwise unobtainable from thick targets (i.e. some refractory elements). Decay Q-values can be determined in this way and hence, binding energies of exotic nuclides.
