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1. Commits on Oct 10, 2026

   • Annihilate positrons below the positron energy cutoff (#4157)

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2. Commits on Oct 9, 2026

   • Fix temperature interpolation at the high endpoint (#4169)

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     agourakis82

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     paulromano

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3. Commits on Oct 8, 2026

   • Fix variance tally trigger to use its own uncertainty ratio (#4175)

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     yrrepy

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     paulromano

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   • Use int64 flat filter index in WeightWindows::update_weights (#4174)

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     yrrepy

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     paulromano

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   • Report unresolvable nuclide names instead of terminating (#4130)

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   • Preserve ENDF target excitation and reaction metadata in HDF5 (#4146)

     paulromano

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4. Commits on Oct 7, 2026

   • Broadcast tally results in chunks (#4125)

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   • Close tally group for internal tallies on statepoint load (#4173)

     yrrepy

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5. Commits on Oct 4, 2026

   • Avoid ldexp call when converting random numbers to double (#4159)

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     GuySten

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     claude

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6. Commits on Oct 3, 2026

   • Add a length multiplier option for XDG meshes. (#4155)

     nuclearkevin

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7. Commits on Sep 27, 2026

   • Add XDG support for unstructured mesh tallies (#3889)

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8. Commits on Sep 19, 2026

   • Enable unused variable warnings (#4142)

     paulromano

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9. Commits on Sep 16, 2026

   • Add domain decomposition for random ray solver (#4026)

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10. Commits on Sep 13, 2026

    • Distinguish atomic and nuclear masses (#4129)

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      paulromano

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      claude

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      141cd30View commit details

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11. Commits on Sep 11, 2026

    • Random Ray Linear Source Gradient Limiter (#4121)

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    • Naive Flux Linear Source Consistency Fix (#4111)

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12. Commits on Sep 10, 2026

    • Deprecate surf_source_read in favor of a file source (#4123)

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    • Reset settings leaked across openmc_finalize() (#4122)

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      GuySten

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      claude

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    • Compute bounding boxes for general planes and tori in C++ (#4087)

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      dylanpulver

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      paulromano

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13. Commits on Sep 9, 2026

    • Adaptive Volume Estimators (#4110)

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    • Export large weight window files through openmc.lib without XML serialization (#4057)

      paulromano

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    • Simplify `get_energy_index` and use it in place of duplicated lookup logic (#4099)

      GuySten

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14. Commits on Sep 8, 2026

    • Fix zero k-effective in random ray runs with generations_per_batch > 1 (#4114)

      GuySten

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      7521471View commit details

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15. Commits on Sep 4, 2026

    • Replace exported settings globals with typed accessors (#4080)

      paulromano

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16. Commits on Sep 1, 2026

    • Replace the IFP parameter enum with independent flags (#4094)

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    • Fix weight window energy defaults being derived before the particle type is known (#4091)

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      GuySten

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      paulromano

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    • Reset temperature range data to original values (#4092)

      GuySten

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17. Commits on Aug 31, 2026

    • Allow mesh material volume calculations outside model geometry (#4028)

      paulromano

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18. Commits on Aug 30, 2026

    • Simplify code using std::clamp (#4086)

      GuySten

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19. Commits on Aug 29, 2026

    • Void guard kappa-fission when tallying in the random ray solver (#4082)

      nuclearkevin

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    • Fix delayed group filter indexing for kinetic parameters calculation (#4077)

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      GuySten

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      paulromano

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    • Fix Mgxs::get_xs CHI_DELAYED indexing the wrong tensor when gout is null (#4067)

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    • Return discrete lines exactly in lin-lin tabular energy sampling (#4069)

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20. Commits on Aug 28, 2026

    • Fix inverse-velocity score bug (#4076)

      GuySten

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      15cd5ebView commit details

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21. Commits on Aug 24, 2026

    • Free WeightWindowGenerators' memory on cpp side (#4066)

      GuySten

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