KIP-Veröffentlichungen

For the first time we have investigated the behavior of fully micro-fabricated low temperature metallic magnetic calorimeters (MMCs) after undergoing an ion-implantation process. This experiment had the aim to show the possibility to perform a high precision calorimetric measurement of the energy spectrum following the electron capture of ¹⁶³Ho using MMCs having the radioactive ¹⁶³Ho ions implanted in the absorber. The isotope ¹⁶³Ho decays through electron capture to ¹⁶³Dy and features the smallest known Q_EC value. This peculiarity makes ¹⁶³Ho a very interesting candidate to investigate the value of the electron neutrino mass by the analysis of the energy spectrum. The implantation of ¹⁶³Ho ions was performed at ISOLDE-CERN. The performance of a detector that underwent an ion-implantation process is compared to the one of a detector without implanted ions. The results show that the implantation dose of ions used in this experiment does not compromise the properties of the detector. Moreover the performance of the detector prototype having the ¹⁶³Ho ions implanted in the absorber is already close to the requirements needed for an experiment with sub-eV sensitivity to the electron neutrino mass. Based on these results, an optimized detector design for future ¹⁶³Ho experiments is presented.

For the first time we have investigated the behavior of fully micro-fabricated low temperature metallic magnetic calorimeters (MMCs) after undergoing an ion-implantation process. This experiment had the aim to show the possibility to perform a high precision calorimetric measurement of the energy spectrum following the electron capture of ¹⁶³Ho using MMCs having the radioactive ¹⁶³Ho ions implanted in the absorber. The isotope ¹⁶³Ho decays through electron capture to ¹⁶³Dy and features the smallest known Q_EC value. This peculiarity makes ¹⁶³Ho a very interesting candidate to investigate the value of the electron neutrino mass by the analysis of the energy spectrum. The implantation of ¹⁶³Ho ions was performed at ISOLDE-CERN. The performance of a detector that underwent an ion-implantation process is compared to the one of a detector without implanted ions. The results show that the implantation dose of ions used in this experiment does not compromise the properties of the detector. Moreover the performance of the detector prototype having the ¹⁶³Ho ions implanted in the absorber is already close to the requirements needed for an experiment with sub-eV sensitivity to the electron neutrino mass. Based on these results, an optimized detector design for future ¹⁶³Ho experiments is presented.