Development of Metallic Magnetic Calorimeters for High Precision Measurements of Calorimetric 187Re and 163Ho Spectra
| Autor: | J.-P. Porst, S. Schäfer, D. Hengstler, P. C. O. Ranitzsch, C. Pies, Sebastian Kempf, Loredana Gastaldo, Achim Fleischmann, Christian Enss |
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| Rok vydání: | 2012 |
| Předmět: | |
| Zdroj: | Journal of Low Temperature Physics. 167:1004-1014 |
| ISSN: | 1573-7357 0022-2291 |
| DOI: | 10.1007/s10909-012-0556-0 |
| Popis: | The measurement of calorimetric spectra following atomic weak decays, beta (b) and electron capture (EC), of nuclides having a very low Q-value, can provide an impressively high sensitivity to a non-vanishing neutrino mass. The achievable sensitivity in this kind of experiments is directly connected to the performance of the used detectors. In particular an energy resolution of a few eV and a pulse formation time well below 1 microsecond are required. Low temperature Metallic Magnetic Calorimeters (MMCs) for soft X-rays have already shown an energy resolution of 2.0 eV FWHM and a pulse rise-time of about 90 ns for fully micro-fabricated detectors. We present the use of MMCs for high precision measurements of calorimetric spectra following the beta-decay of Re-187 and the EC of Ho-163. We show results obtained with detectors optimized for Re-187 and for Ho-163 experiments respectively. While the detectors equipped with superconducting Re absorbers have not yet reached the aimed performance, a first detector prototype with a Au absorber having implanted Ho-163 ions already shows excellent results. An energy resolution of 12 eV FWHM and a rise time of 90 ns were measured. |
| Databáze: | OpenAIRE |
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