BIGSTICK: A flexible configuration-interaction shell-model code (updated)

Abstract

We present BIGSTICK, a flexible configuration-interaction open-source shell-model code for the many-fermion problem. Written mostly in Fortran 90 with some later extensions, BIGSTICK utilizes a factorized on-the-fly algorithm for computing many-body matrix elements, and has both MPI (distributed memory) and OpenMP (shared memory) parallelization, and can run on platforms ranging from laptops to the largest parallel supercomputers. It uses a flexible yet efficient many-body truncation scheme, and reads input files in multiple formats, allowing one to tackle both phenomenological (major valence shell space) and ab initio (the so-called no-core shell model) calculations. BIGSTICK can generate energy spectra, static and transition one-body densities, and expectation values of scalar operators. Using the built-in Lanczos algorithm one can compute transition probability distributions and decompose wave functions into components defined by group theory. This manual provides a general guide to compiling and running BIGSTICK, which comes with numerous sample input files, as well as some of the basic theory underlying the code. Updated November 2025 to version 8.0.0

This code is distributed under the MIT Open Source License. The source code and sample inputs are found at github.com/cwjsdsu/BigstickPublick. Updated November 2025 to version 8.0.0

References in corpus (5)

• Factorization in large-scale many-body calculations
• Density matrix renormalization group and wave function factorization for nuclei
• Solution of large scale nuclear structure problems by wave function factorization
• Nuclear shell-model code for massive parallel computation, "KSHELL"
• Efficient matrix-vector products for large-scale nuclear Shell-Model calculations

Cited by in corpus (23)

• A Guided Tour of Ab Initio Nuclear Many-Body Theory
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• Nuclear Forces for Precision Nuclear Physics -- a collection of perspectives
• From deformed Hartree-Fock to the nucleon-pair approximation
• Constructing approximate shell-model wavefunctions by eigenvector continuation
• Uncertainty quantification of an empirical shell-model interaction using principal component analysis
• Next-to-leading order scalar contributions to $\mu \to e$ conversion
• Transition sum rules in the shell model
• Application of efficient generator-coordinate subspace-selection algorithm to neutrinoless double-$\beta$ decay
• Non-parametric Bayesian approach to extrapolation problems in configuration interaction methods
• The nucleon-pair approximation for nuclei from spherical to deformed regions
• Asymptotic characteristics of decay channels of light nuclei states in the ab initio approach
• Improvement Studies of an Effective Interaction for N=Z sd-shell Nuclei by Neural Networks
• Rotational bands beyond the Elliott model
• Pairing correlations and eigenvalues of two-body density matrix in atomic nuclei
• Importance truncation for the in-medium similarity renormalization group
• Indirect detection of dark matter absorption in the Galactic Center
• Current Status of Very-Large-Basis Hamiltonian Diagonalizations for Nuclear Physics
• Investigation of Nuclear Structures of Ne Isotopes by Nuclear Shell Model
• Study of entanglement in Ne, Mg, and Si isotopic chains
• Earth-Catalyzed Detection of Magnetic Inelastic Dark Matter with Photons in Large Underground Detectors