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Beta spectrometry with metallic magnetic calorimeters
M Loidl1, M Rodrigues1, C Le-Bret1
1LNE-Laboratoire National Henri Becquerel, CEA Saclay, DRT/LIST/DM2I, Gif-sur-Yvette 91191, France.
Summary
Metallic magnetic calorimeters precisely measure low-energy beta spectra. Electroplated sources yield reproducible, theoretically sound results, confirming atomic exchange effects down to 200 eV.
Area of Science:
- Physics
- Nuclear Physics
- Metrology
Background:
- Metallic magnetic calorimeters (MMCs) are advanced cryogenic detectors.
- MMCs enable precise measurements of low-energy beta spectra shapes.
- Accurate beta spectrum analysis is crucial for fundamental physics and metrology.
Purpose of the Study:
- To determine the shape factors of beta spectra using MMCs at LNHB.
- To investigate the influence of source preparation methods on spectral measurements.
- To confirm subtle atomic effects in beta decay at low energies.
Main Methods:
- Utilizing metallic magnetic calorimeters for high-efficiency beta spectrum detection.
- Enclosing the beta source within the detector absorber.
- Comparing spectral data from sources prepared via different methods (drying vs. electroplating).
Main Results:
- Beta spectra of Nickel-63 ((63)Ni) varied significantly based on source preparation.
- Drying NiCl2 solutions resulted in irreproducible spectra deviating from theoretical predictions.
- Electroplated sources yielded reproducible spectra consistent with theoretical models.
- Atomic exchange effects were confirmed down to 200 eV using electroplated sources.
Conclusions:
- The choice of beta source preparation is critical for accurate spectral measurements with MMCs.
- Electroplating is the preferred method for preparing (63)Ni sources for precise beta spectroscopy.
- This study validates the sensitivity of MMCs for detecting low-energy atomic effects in beta decay.
Keywords:
Beta spectrometryCryogenic detectorsIonizing radiation metrologyMetallic magnetic calorimetersNuclear dataMore Related Videos
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