unzhakov
ab164fbf98
fix: robust Am-241 calibration with width-constrained peak detection
...
- Use find_peaks width=(5,50) to reject noise bumps
- Simplify peak matching: find two strongest peaks with largest
channel separation, assign min/max known energies
- Require absolute threshold of 400 counts to avoid noise peaks
- Calibration now correctly maps: ch 97→13.0 keV, ch 537→59.54 keV
- Tc-99 endpoint at ch 2750 → 293.6 keV (expected ~294)
- Add .rpiv/ to .gitignore
2026-05-21 18:21:51 +03:00
unzhakov
8952d0f789
fix: robust Am-241 peak detection for energy calibration
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- Search full spectrum (exclude pulser region) instead of just low-energy
- Include 59.54 keV line in known Am-241 energies
- Brute-force peak-to-energy matching with physical gain constraint
(3-40 ch/keV) to reject spurious fits
- Fixed find_peaks parameters: height=100, distance=5 for accurate
peak detection
- Calibration now correctly maps: ch 97→13 keV, ch 134→17.4 keV,
ch 537→59.6 keV, giving Tc-99 endpoint at ch 2750→291.6 keV
- Add .rpiv/ to .gitignore
2026-05-21 16:43:10 +03:00
unzhakov
5c2b12c0e6
feat: experimental data calibration pipeline with ROOT I/O
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- Fix chi2 calculation bug in calibration.py (remove incorrect
coeffs[::-1] reversal in np.polyval)
- Fix broken beta_spectrum/cli.py (remove orphaned detector response
add_argument calls and unused imports)
- Add ExpSpectrum.apply_calibration() and EnergyCalibrator.from_am241_spectrum()
- Add LivetimeDetermination class for pulser-based livetime
- Add SpectrumPipeline orchestration (read→subtract→calibrate→livetime→validate)
- Add ROOT I/O with PyROOT primary + uproot fallback
- Add bs_exp CLI with process, livetime, export subcommands
- Add exp_calibration notebook with pre-calibration visualization
- Add comprehensive tests (73 passing)
- Add bs_exp console script and [root] extra to pyproject.toml
- Remove obsolete detector_response module and unused notebooks
2026-05-21 16:01:25 +03:00
unzhakov
caa4a77ebd
fix: correct energy calibration from Am-241 peaks
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- Am-241 peaks at ch 134=13.8, ch 163=17.8, ch 218=26.3 keV
- Calibration: E = 0.397 + 0.0995 × ch (previously wrong)
- Kurie fit endpoint 425 keV vs Q=297.5 keV — spectrum extends
beyond MCA range (407 keV), simple extrapolation unreliable
- Proper endpoint extraction requires theory model + detector
convolution (fitter module), not simple Kurie plot
2026-05-18 00:01:28 +03:00
unzhakov
5f70e3a15a
feat: add raw binary spectrum reader and data quality analysis
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- exp_data/raw_reader.py: read binary MCA spectra (128-byte header,
int32 counts), subtract cumulative spectra, Am-241 calibration
- exp_data/spectrum.py: allow negative counts for difference spectra
- scripts/analyze_raw.py: analyze 236 individual runs from cumulative
data, compute rates and endpoint drift
- Am-241 calibration: E = -0.96 + 0.451 * ch (CAM1),
E = 0.75 + 0.442 * ch (CAM2)
- Results: stable rate ~2M counts/run, stable endpoint ~374 keV
(smeared Q-value), spike at runs 214-219 (acquisition glitch)
2026-05-17 22:55:52 +03:00
unzhakov
38b44b56e6
feat: v0.4.0 package restructuring — split into 4 modules
...
Separate monolithic beta_spectrum package into:
beta_spectrum — pure theory (components, spectrum, CLI, visualize)
exp_data — experimental data handling (spectrum, calibration,
fitters, corrections)
fitter — analysis framework (model, fit_engine, extractor,
result)
beta_spectrum.visualize — plotting (BetaSpectrumAnalyzer)
Phase 1 — exp_data module:
ExpSpectrum dataclass with metadata, normalization, serialization
EnergyCalibrator (linear/quadratic calibration)
GaussianFitter + PeakFitter for calibration sources
DeadTimeCorrection, PileUpCorrection, BackgroundSubtractor
43 new tests, ruff + mypy clean
Phase 2 — fitter module:
SpectrumModel wraps BetaSpectrum + DetectorResponse with convolution
SpectrumFitter with χ² minimization, covariance, profile likelihood,
confidence intervals, robust loss functions
CWExtractor + GVAExtractor for C(W) and g_V/g_A extraction
AnalysisResult + FitSummary for physics-specific results
CurveFitter general-purpose callable model fitter
34 new tests, ruff + mypy clean
Phase 3 — clean up beta_spectrum:
Remove cw_extractor.py and fitter.py (moved to fitter/)
Clean __init__.py to export only theory classes
Add backward-compat methods to CWExtractor
Fix BetaSpectrumAnalyzer._get_branch_spectrum returning BetaSpectrum
objects instead of numpy arrays (plot fix)
Phase 4 — package structure:
Auto-discovered by setuptools (4 packages)
All imports updated across 26 source files
Black formatting applied
322 tests pass (262 original + 60 new)
ruff + mypy clean on all source files
Bug fixes:
- Fix multi-branch spectrum plotting: universal component keys
(Fermi, Screening, etc.) don't have per-branch prefix; fixed
fallback lookup.
- Fix negative phase space beyond endpoint: BetaSpectrum returns
negative values for W > W0; clamp branch spectra to zero.
2026-05-17 18:58:04 +03:00
unzhakov