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docs: remove empty recoil.py stub, update README and TODO to reflect actual state

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- Remove empty beta_spectrum/components/recoil.py (0-line stub)
- Remove recoil.py from README.md project tree and components table
- Update TODO.md: replace specific recoil section with generic 'Additional
  Corrections' deferred item, update Current Status to 0.3.0 with actual
  implementation list, mark A4 as complete, set A3 as next step
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unzhakov
2026-05-04 11:56:41 +03:00
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TODO.md
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@@ -175,9 +175,9 @@ ______________________________________________________________________
## Deferred (Not Planned)
### Nuclear Recoil Correction (`recoil.py`)
### Additional Corrections
Not implementing at this time. The recoil correction (weak magnetism, recoil kinematics) is a small O(q/M_N) effect (~0.1%) that is subdominant to the shape factor C(W) we aim to extract. In the ⁹⁹Tc analysis, the shape factor absorbs all unmodelled energy-dependent effects — including recoil — so implementing recoil explicitly is unnecessary for the scientific goal.
Not implementing at this time. Additional corrections (weak magnetism, recoil kinematics, etc.) require a complex implementation with project-wide consequences. This is a far-future plan, irrelevant to the current ⁹⁹Tc analysis goal where the shape factor C(W) absorbs all unmodelled energy-dependent effects.
### Nuclear Shape Factors C(Z,W)
@@ -194,9 +194,9 @@ ______________________________________________________________________
## Current Status
**Version:** 0.2.0\
**Implemented:** Phase space, Fermi function, finite size, screening, exchange, radiative corrections (with delta_cut resummation). Detector response module with analytical models (Gaussian, Gaussian+tail, Tikhonov), convolution API, declarative config integration. Comprehensive test suite (106 tests). Notebook quality control with nbmake and auto-save plot hooks.
**Version:** 0.3.0\
**Implemented:** Phase space, Fermi function, finite size, screening, exchange, radiative corrections (with delta_cut resummation). Detector response module with analytical models (Gaussian, Gaussian+tail, Tikhonov), convolution API, declarative config integration. χ² curve fitting framework (CurveFitter) with confidence intervals, profile likelihood, and correlation analysis. C(W) shape factor extraction pipeline (CWExtractor) with Kurie plot analysis, parametrized fitting, and g_V/g_A extraction. CLI interface (`bs_pnpi`) with paceENSDF integration. Comprehensive test suite (167 tests). Notebook quality control with nbmake and auto-save plot hooks.
**Completed:** A2 — detector response function and convolution routines.
**Completed:** A2 — detector response function and convolution routines. A4 — fitter routine and C(W) extraction pipeline.
**Next immediate step:** A4 — implement fitter routine to extract experimental C(W) from data.
**Next immediate step:** A3 — data processing pipeline for experimental spectra (background subtraction, energy calibration, dead-time correction, pulse pile-up correction).