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HomeNuclear structure and astrophysicsTrap-assisted decay spectroscopy

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+ \beta 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.