refactor: remove stale detector schema keys and single-mode duplicates

- DEFAULT_JSON_SCHEMA: drop the 8 detector_* keys left over from the
  removed detector_response module; CLI dry-run drops the dead
  'Detector: not configured (Phase 4)' line
- CSV export: single-mode no longer writes branch_1_PhaseSpace /
  branch_1_Radiative duplicates next to the bare PhaseSpace/Radiative
  columns; per-branch core factors only in multi-branch mode
- Visualizer: debug panels fall back to the unprefixed core-factor
  columns for single-mode CSVs instead of skipping them
- Spectrum ylabel now states the actual units: normalized spectrum
  [MeV^-1], not 'Normalized Counts / keV'
- tests: defaults assert detector keys gone; column layout pinned for
  single vs multi; panel and ylabel assertions

beta_spectrum/cli.py

@@ -372,8 +372,6 @@ def _print_dry_run_output(config, source_type: str) -> None:
     else:
         print("Mode: single-branch")
 
-    # Detector response is a Phase 4 feature — not yet implemented
-    print("Detector:   not configured (Phase 4)")
     print("========================================")
 
 

beta_spectrum/nuclear_data.py

@@ -554,14 +554,6 @@ DEFAULT_JSON_SCHEMA = {
     "transition_type": "F2",
     "e_step_MeV": 0.001,
     "neutrino_mass_MeV": 0.0,
-    "detector_model": "gaussian",
-    "detector_sigma_a_keV": 1.0,
-    "detector_sigma_b": 0.0,
-    "detector_tail_fraction": 0.0,
-    "detector_tau_keV": 5.0,
-    "detector_fano_factor": 0.12,
-    "detector_n_channels": 4096,
-    "detector_channel_energy_range": [0.0, 0.35],
 }
 
 

beta_spectrum/output/csv_export.py

@@ -211,14 +211,20 @@ class CSVEmitter:
 
         if csv_verbosity == "full":
             # Per-branch component columns (factorized ingredients).
-            for i in range(n_branches):
-                for comp_name in ["PhaseSpace", "Radiative"]:
-                    key = analyzer._get_component_key(i, comp_name)
-                    if key in components:
-                        data[f"branch_{i + 1}_{comp_name}"] = components[key]
+            # Only multi-branch mode carries per-branch factors: in single
+            # mode the bare PhaseSpace/Radiative columns below already
+            # describe the single spectrum, and prefixed duplicates would
+            # silently disagree with them once renamed.
+            if analyzer._is_multi:
+                for i in range(n_branches):
+                    for comp_name in ["PhaseSpace", "Radiative"]:
+                        key = analyzer._get_component_key(i, comp_name)
+                        if key in components:
+                            data[f"branch_{i + 1}_{comp_name}"] = components[key]
 
             # Universal components (no prefix): Fermi plus universal
-            # higher-order corrections.
+            # higher-order corrections. In single mode the core factors
+            # (PhaseSpace, Radiative) also appear here unprefixed.
             for name, values in components.items():
                 if not name.startswith("branch_"):
                     data[name] = values

beta_spectrum/output/visualization.py

@@ -235,7 +235,6 @@ def _plot_spectra_view_from_df(
 ) -> Figure:
     """Plot total spectrum and per-branch spectra from CSV columns."""
     energies = df["energy_MeV"].to_numpy()
-    e_step_keV = (meta["e_step_MeV"] or 0.0) * 1000.0
 
     fig, ax = plt.subplots(figsize=(12, 7))
 
@@ -266,7 +265,7 @@ def _plot_spectra_view_from_df(
         )
 
     ax.set_xlabel(r"Electron kinetic energy $E$ [MeV]", fontsize=12)
-    ax.set_ylabel(f"Normalized Counts / {e_step_keV:.1f} keV", fontsize=12)
+    ax.set_ylabel(r"Normalized spectrum [MeV$^{-1}$]", fontsize=12)
     fig.suptitle(_spectrum_title(meta), fontsize=14, fontweight="bold")
     ax.set_yscale("log")
     ax.grid(True, alpha=0.3)
@@ -288,7 +287,6 @@ def _plot_debug_view_from_df(
 ) -> Figure:
     """Debug view (4 panels) built entirely from CSV columns."""
     energies = df["energy_MeV"].to_numpy()
-    e_step_keV = (meta["e_step_MeV"] or 0.0) * 1000.0
     active = _active_branches(meta)
 
     fig, axes = plt.subplots(4, 1, figsize=(12, 16), sharex=True)
@@ -318,7 +316,7 @@ def _plot_debug_view_from_df(
             label=f"Br. {b['index']} ({b['intensity'] * 100:.1f}%)",
         )
     ax.set_yscale("log")
-    ax.set_ylabel(f"Normalized Counts / {e_step_keV:.1f} keV", fontsize=10)
+    ax.set_ylabel(r"Normalized spectrum [MeV$^{-1}$]", fontsize=10)
     ax.set_title("Spectrum", fontsize=11)
     ax.grid(True, alpha=0.3)
     ax.legend(fontsize=8, loc="best", ncol=2)
@@ -331,6 +329,9 @@ def _plot_debug_view_from_df(
         ax.plot(energies, fermi_scaled, "r-", lw=1.5, label="Fermi", alpha=0.8)
     for color_i, b in enumerate(active):
         col = f"branch_{b['index']}_PhaseSpace"
+        if col not in df.columns:
+            # Single-branch CSVs carry the core factors unprefixed.
+            col = "PhaseSpace"
         if col not in df.columns:
             continue
         ps_vals = df[col].to_numpy()
@@ -374,6 +375,9 @@ def _plot_debug_view_from_df(
     ax = axes[3]
     for color_i, b in enumerate(active):
         col = f"branch_{b['index']}_Radiative"
+        if col not in df.columns:
+            # Single-branch CSVs carry the core factors unprefixed.
+            col = "Radiative"
         if col not in df.columns:
             continue
         ax.plot(

tests/physics/test_core_spectrum.py

@@ -605,9 +605,7 @@ class TestNormalizationModeMatrix:
         )
         assert np.isclose(area, 1.0, rtol=5e-4)
 
-    def test_intensity_concise_branch_columns_sum_to_total(
-        self, tmp_path: Any
-    ) -> None:
+    def test_intensity_concise_branch_columns_sum_to_total(self, tmp_path: Any) -> None:
         config = make_multi_config()
         spectrum = BetaSpectrum.from_config(config)
         analyzer = BetaSpectrumAnalyzer(spectrum, config)
@@ -622,10 +620,7 @@ class TestNormalizationModeMatrix:
         )
         total = df["total_spectrum"].to_numpy()
         nonzero = total > 1e-12
-        assert np.all(
-            np.abs(summed[nonzero] - total[nonzero])
-            <= total[nonzero] * 5e-4
-        )
+        assert np.all(np.abs(summed[nonzero] - total[nonzero]) <= total[nonzero] * 5e-4)
 
     def test_plot_from_csv_to_one_plots_branches_without_total(
         self, tmp_path: Any
@@ -635,9 +630,7 @@ class TestNormalizationModeMatrix:
         analyzer = BetaSpectrumAnalyzer(spectrum, config)
         path, df = export_and_read(analyzer, tmp_path, "to_one_plot.csv")
 
-        fig = Visualizer.plot_from_csv(
-            path, save_path=None, show_components=True
-        )
+        fig = Visualizer.plot_from_csv(path, save_path=None, show_components=True)
         assert len(fig.axes) == 4
         # Panel 1 has exactly the 3 branch curves — no total spectrum
         # exists in to_one mode.
@@ -646,9 +639,7 @@ class TestNormalizationModeMatrix:
         assert len(curves) == 3
         energies = df["energy_MeV"].to_numpy()
         assert np.allclose(curves[0][:, 0], energies)
-        assert np.allclose(
-            curves[0][:, 1], df["branch_1_spectrum"].to_numpy()
-        )
+        assert np.allclose(curves[0][:, 1], df["branch_1_spectrum"].to_numpy())
 
     def test_plot_analysis_to_one_returns_figure(self, tmp_path: Any) -> None:
         config = make_multi_config(normalize_to_one=True)
@@ -669,11 +660,70 @@ class TestNormalizationModeMatrix:
             analyzer, tmp_path, "to_one_concise2.csv", csv_verbosity="concise"
         )
 
-        fig = Visualizer.plot_from_csv(
-            path, save_path=None, show_components=True
-        )
+        fig = Visualizer.plot_from_csv(path, save_path=None, show_components=True)
         captured = capsys.readouterr()
         assert "Warning" in captured.out
         # Simple spectra view: one axis, 3 branch curves, no total curve.
         assert len(fig.axes) == 1
         assert len(fig.axes[0].lines) == 3
+
+
+class TestSingleModeColumnCleanup:
+    """Single-mode CSVs carry the factorized components once, unprefixed;
+    multi-mode CSVs carry them per branch; the visualizer reads whichever
+    naming the file actually uses."""
+
+    def test_single_mode_full_export_has_unprefixed_components_only(
+        self, tmp_path: Any
+    ) -> None:
+        config = make_single_config(use_radiative=True)
+        spectrum = BetaSpectrum.from_config(config)
+        analyzer = BetaSpectrumAnalyzer(spectrum, config)
+        path, df = export_and_read(analyzer, tmp_path, "single_components.csv")
+
+        assert "PhaseSpace" in df.columns
+        assert "Radiative" in df.columns
+        assert "Fermi" in df.columns
+        assert "branch_1_spectrum" in df.columns
+        assert "branch_1_PhaseSpace" not in df.columns
+        assert "branch_1_Radiative" not in df.columns
+
+    def test_multi_mode_full_export_has_prefixed_core_factors(
+        self, tmp_path: Any
+    ) -> None:
+        config = make_multi_config(use_radiative=True)
+        spectrum = BetaSpectrum.from_config(config)
+        analyzer = BetaSpectrumAnalyzer(spectrum, config)
+        path, df = export_and_read(analyzer, tmp_path, "multi_components.csv")
+
+        assert "branch_1_PhaseSpace" in df.columns
+        assert "branch_2_Radiative" in df.columns
+        assert "Fermi" in df.columns
+        # The bare core-factor names belong to single mode only.
+        assert "PhaseSpace" not in df.columns
+        assert "Radiative" not in df.columns
+
+    def test_debug_view_single_csv_includes_core_panels(self, tmp_path: Any) -> None:
+        config = make_single_config(use_radiative=True)
+        spectrum = BetaSpectrum.from_config(config)
+        analyzer = BetaSpectrumAnalyzer(spectrum, config)
+        path, _df = export_and_read(analyzer, tmp_path, "single_plot.csv")
+
+        fig = Visualizer.plot_from_csv(path, None, show_components=True)
+        assert len(fig.axes) == 4
+        # Panel 2: Fermi + the single branch's phase space.
+        assert len(fig.axes[1].lines) == 2
+        labels = [ln.get_label() for ln in fig.axes[1].lines]
+        assert "Fermi" in labels
+        assert any("PS Br" in str(lbl) for lbl in labels)
+        # Panel 4: the radiative correction for the single branch.
+        assert len(fig.axes[3].lines) == 1
+
+    def test_ylabel_uses_per_MeV_units(self, tmp_path: Any) -> None:
+        config = make_multi_config()
+        spectrum = BetaSpectrum.from_config(config)
+        analyzer = BetaSpectrumAnalyzer(spectrum, config)
+        path, _df = export_and_read(analyzer, tmp_path, "ylabel.csv")
+
+        fig = Visualizer.plot_from_csv(path, None, show_components=True)
+        assert "MeV$^{-1}$" in fig.axes[0].get_ylabel()

tests/quality/test_nuclear_data.py

@@ -161,9 +161,12 @@ class TestJsonInput:
         path = self._write_json(data)
         try:
             loaded = load_json_input(str(path))
-            # Defaults should be filled in
-            assert loaded["detector_model"] == "gaussian"
-            assert loaded["detector_sigma_a_keV"] == 1.0
+            # Defaults should be filled in. The detector_* schema keys were
+            # removed together with the detector_response module; JSON
+            # defaults carry spectrum physics only.
+            assert "detector_model" not in loaded
+            assert loaded["neutrino_mass_MeV"] == 0.0
+            assert loaded["transition_type"] == "F2"
         finally:
             path.unlink()