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Feature: Add model.description

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# Description This pull request introduces a description attribute to the Model class, allowing users to add a descriptive text to their models. This description is saved in the settings.xml...

ondrejch

Migrate to SciPy sparse arrays

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# Description In recent versions of scipy, they have introduced sparse arrays (e.g., `csc_array`) that generalize the existing sparse matrix classes to N dimensions. The scipy documentation [recommends migrating](https://docs.scipy.org/doc/scipy/reference/sparse.migration_to_sparray.html) to...

paulromano

# Description This pr generalize CylindricalIndependent to support symmetry axis in every direction and not only in z direction. This pr also implement cylindrical_uniform and ring_uniform to generate uniform spatial...

GuySten

Tally spectrum of secondary particles

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# Description This PR enable tallying spectrum of secondary particles. This PR is a different approach to #3453 . # Checklist - [x] I have performed a self-review of my...

GuySten

Add incident proton data class

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I'm adding incident proton data class for the library conversion from ACE to HDF5. In the code implementation, it is almost a replication of the incident neutron data class with...

jiankai-yu

## Description In order to study which isotopes contribute to the $\beta_{eff}$ estimation, a very studied aspect, it could be interesting to add a nuclide filter to the beta_numerator tally....

OlivaresDarian

Implement vector fitting to replace external `vectfit` package

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# Description This pull request removes the dependency on the unmaintained external `vectfit` package (https://github.com/liangjg/vectfit) used in OpenMC's windowed multipole (WMP) infrastructure. In its place, a vector fitting is introduced...

azimgivron

get_microxs_and_flux Incorrect Meshbase

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## Bug Description **get_microxs_and_flux** uses the meshbase of an existing weight window rather than prescribed domains meshbase ## Steps to Reproduce - take an OpenMC model - apply weight windows...

yrrepy

## Description Add a `description` attribute to the `openmc.Model` class, allowing users to store an arbitrary description string for the model. This description should be written as an XML element...

ondrejch

Hi, I have created an XML schema (XSD) from the depletion chains structure documented in [link](https://docs.openmc.org/en/stable/io_formats/depletion_chain.html). This schema can be used to detect structural and type errors before any data...

Canzian