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Hannover 2016 – scientific programme

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MS: Fachverband Massenspektrometrie

MS 4: Resonance Ionization MS and others

MS 4.3: Talk

Tuesday, March 1, 2016, 15:15–15:30, f128

Separation and Implantation of the Rare Isotope 163Ho for the ECHo Project — •Tom Kieck1, Katerina Chrysalidis1, Holger Dorrer1, Christoph Düllmann1,2, Lisa Gamer3, Loredana Gastaldo3, Stefan Kormannshaus1, Sebastian Schmidt1, Fabian Schneider1, and Klaus Wendt11JGU Mainz — 2GSI Darmstadt — 3Universität Heidelberg

The ECHo collaboration aims at measuring the electron neutrino mass by recording the spectrum following electron capture of 163Ho. To reach a sub-eV sensitivity, a large number of individual microcalorimeters is needed, into which the isotope must be implanted in a well-controlled manner. The necessary amount of 163Ho is produced by neutron irradiation of enriched 162Er in the ILL high flux reactor. This introduces significant contaminations of other radioisotopes, which have to be quantitatively removed both, by chemical and mass spectrometric separation. The application of resonance ionization at the RISIKO mass separator guarantees the required isotope selectivity for purification and suitable energy for ion implantation. The efficiency and stability of the laser ion source was improved by Finite-Element Analysis of the thermal processes. For optimum implantation into the detector pixels (170 × 170 µ m2) with minimum losses a small ion beam spot at the implantation site is needed. For this purpose, post focusing ion optics were installed. Simulations were performed in order to optimize the homogeneous distribution of the implanted ions. The necessity to alternate implantation phases with deposition of a thin metallic layer for 163Ho activities larger than 10 Bq is being discussed.

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