| タイトル | Development of Metallic Magnetic Calorimeters for High Precision Measurements of Calorimetric Re-187 and Ho-163 Spectra |
| 著者（英） | Schafer, S.; Pies, C.; Fleischmann, A.; Enss, C.; Porst, J.-P.; Hengstler, D.; Ranitzsch, P. C.-O.; Kempf, S.; Gastaldo, L. |
| 著者所属（英） | Heidelberg Univ. |
| 発行日 | 2012-02-02 |
| 言語 | eng |
| 内容記述 | 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. |
| NASA分類 | Physics of Elementary Particles and Fields |
| レポートNO | GSFC.JA.6888.2012 |
| 権利 | Copyright |
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