Heidelberg 2015 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 6: Posters

MS 6.9: Poster

Dienstag, 24. März 2015, 17:00–19:00, C/Foyer

An ion trap for in-trap nuclear decay-spectroscopy experiments* — •Christine Weber and Peter G. Thirolf — Fakultät für Physik, LMU - München, 85748 Garching

A novel type of ion-trap setup, dedicated for decay-spectroscopy experiments on stored ions, is presently being built at the MLLTRAP Penning trap system in Garching [1]. Being free from any background or scattering effects, a trapped ion resembles the ideal source, and hence will facilitate a direct, in-situ observation of its decay products. For this purpose, a customized ’detector trap’ made from Si-strip detectors will provide the ion storage potential and allow for the detection of alpha particles, whereas emitted electrons can be very efficiently guided by the magnetic field of the trap’s solenoid to an auxiliary detector.

Possible experiments are in-trap alpha-decay experiments of heavy actinides and conversion-electron spectroscopy. Moreover, a coincident detection of an alpha decay with electron detection allows for a reconstruction of the original positions of electron clouds initiated by shake-off as well as from subsequent conversion decay. Via this decay length, the half-lives of states, e.g., 2⁺, populated by alpha decay can be derived in a unique type of recoil-distance method. In this presentation, the design and characterization results of the detector systems are presented and possible physics experiments are highlighted.

[1] C. Weber et al., Int. J. of Mass Spectrometry 349-350, 270 (2013).

* Supported by BMBF (06ML9148, 05P12WMFNE), DFG (HA 1101/14-1).