unzhakov
876e1e3ab8
- Add neutrino mass parameter to SpectrumConfig and CLI interface - Update PhaseSpace component to handle neutrino mass effects properly - Update CSV headers to show basic endpoint and all transition types - Add --csv-verbosity option to CLI with 'full' and 'concise' options - Fix comparison plots to properly show linear scale variations - Add comprehensive tests for neutrino mass functionality
1.5 KiB
1.5 KiB
Paulsen et al. (2024) — High precision measurement of 99Tc β spectrum
Citation
Paulsen, M., Ranitzsch, P.C.-O., Loidl, M., et al. (2024). High precision measurement of the ⁹⁹Tc β spectrum. Physical Review C, 110, 055503. DOI: 10.1103/PhysRevC.110.055503
Key Results
| Parameter | Value | Method |
|---|---|---|
| Q_β | 295.82(16) keV | MMC measurement |
| g_A^eff | 1.526(92) | Spectrum shape (CVC-fixed sNME) |
| g_V^eff | 0.376(5) | Half-life normalization |
| g_A^eff (quenched) | 0.574(36) | Half-life normalization |
| E_β | 98.51(23) keV | Theoretical spectrum integration |
| log f | −0.47660(22) | Theoretical spectrum |
| log f t | 12.3478(23) | Partial half-life |
Methodology
- Detector: Metallic Magnetic Calorimeters (MMCs) at LNHB and PTB
- Energy threshold: 0.65 keV (orders of magnitude lower than previous measurements)
- Energy resolution: 0.1 keV at 383 keV
- Nuclear model: NUSHELLX with GLEKPN valence space, Mach interaction
- sNME treatment: CVC-fixed (not ESSM)
Key Figures
- Figure 9: g_A-dependent theoretical β spectrum — shows dramatic shape changes for g_A ∈ {0.5, 0.8, 1.0, 1.2, 1.4, 1.6, 2.0}
- Figure 10: Best-fit theoretical spectrum vs. measurement
Limitations
- Used CVC-fixed sNME (not ESSM) → enhanced g_A value
- Song et al. (2025) contradicts this result using ESSM