TY - JOUR
T1 - MetroMMC
T2 - Electron-Capture Spectrometry with Cryogenic Calorimeters for Science and Technology
AU - Ranitzsch, P. C.O.
AU - Arnold, D.
AU - Beyer, J.
AU - Bockhorn, Lina
AU - Bonaparte, J. J.
AU - Enss, C.
AU - Kossert, K.
AU - Kempf, S.
AU - Loidl, M.
AU - Mariam, R.
AU - Nähle, O. J.
AU - Paulsen, M.
AU - Rodrigues, M.
AU - Wegner, M.
N1 - Funding information: This work was performed as part of the EMPIR Project 17FUN02 MetroMMC. This project has received funding from the EMPIR program co-financed by the Participating States and from the European Union’s Horizon 2020 research and innovation program. Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations. This work was performed as part of the EMPIR Project 17FUN02 MetroMMC. This project has received funding from the EMPIR program co-financed by the Participating States and from the European Union?s Horizon 2020 research and innovation program.
PY - 2020/4
Y1 - 2020/4
N2 - Accurate decay data of radionuclides are necessary for many fields of science and technology, ranging from medicine and particle physics to metrology. However, data that are in use today are mostly based on measurements or theoretical calculation methods that are rather old. Recent measurements with cryogenic detectors and other methods show significant discrepancies to both older experimental data and theory in some cases. Moreover, the old results often suffer from large or underestimated uncertainties. This is in particular the case for electron-capture (EC) decays, where only a few selected radionuclides have ever been measured. To systematically address these shortcomings, the European metrology project MetroMMC aims at investigating six radionuclides decaying by EC. The nuclides are chosen to cover a wide range of atomic numbers Z, which results in a wide range of decay energies and includes different decay modes, such as pure EC or EC accompanied by γ- and/or β+-transitions. These will be measured using metallic magnetic calorimeters (MMCs), cryogenic energy-dispersive detectors with high-energy resolution, low-energy threshold and high, adjustable stopping power that are well suited for measurements of the total decay energy and X-ray spectrometry. Within the MetroMMC project, these detectors are used to obtain X-ray emission intensities of external sources as well as fractional EC probabilities of sources embedded in a 4 π absorber. Experimentally determined nuclear and atomic data will be compared to state-of-the-art theoretical calculations which will be further developed within the project. This contribution introduces the MetroMMC project and in particular its experimental approach. The challenges in EC spectrometry are to adapt the detectors and the source preparation to the different decay channels and the wide energy range involved, while keeping the good resolution and especially the low-energy threshold to measure the EC from outer shells.
AB - Accurate decay data of radionuclides are necessary for many fields of science and technology, ranging from medicine and particle physics to metrology. However, data that are in use today are mostly based on measurements or theoretical calculation methods that are rather old. Recent measurements with cryogenic detectors and other methods show significant discrepancies to both older experimental data and theory in some cases. Moreover, the old results often suffer from large or underestimated uncertainties. This is in particular the case for electron-capture (EC) decays, where only a few selected radionuclides have ever been measured. To systematically address these shortcomings, the European metrology project MetroMMC aims at investigating six radionuclides decaying by EC. The nuclides are chosen to cover a wide range of atomic numbers Z, which results in a wide range of decay energies and includes different decay modes, such as pure EC or EC accompanied by γ- and/or β+-transitions. These will be measured using metallic magnetic calorimeters (MMCs), cryogenic energy-dispersive detectors with high-energy resolution, low-energy threshold and high, adjustable stopping power that are well suited for measurements of the total decay energy and X-ray spectrometry. Within the MetroMMC project, these detectors are used to obtain X-ray emission intensities of external sources as well as fractional EC probabilities of sources embedded in a 4 π absorber. Experimentally determined nuclear and atomic data will be compared to state-of-the-art theoretical calculations which will be further developed within the project. This contribution introduces the MetroMMC project and in particular its experimental approach. The challenges in EC spectrometry are to adapt the detectors and the source preparation to the different decay channels and the wide energy range involved, while keeping the good resolution and especially the low-energy threshold to measure the EC from outer shells.
KW - Electron-capture decay
KW - Metallic magnetic calorimeter
KW - Radionuclide metrology
UR - https://www.scopus.com/pages/publications/85076779320
U2 - 10.1007/s10909-019-02278-4
DO - 10.1007/s10909-019-02278-4
M3 - Article
AN - SCOPUS:85076779320
SN - 0022-2291
VL - 199
SP - 441
EP - 450
JO - Journal of low temperature physics
JF - Journal of low temperature physics
IS - 1-2
ER -