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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2018
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/1801.08432 |
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| _version_ | 1866911251351732224 |
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| author | Johnson, Calvin W. Ormand, W. Erich McElvain, Kenneth S. Zbikowski, Ryan Shan, Hongzhang |
| author_facet | Johnson, Calvin W. Ormand, W. Erich McElvain, Kenneth S. Zbikowski, Ryan Shan, Hongzhang |
| contents | 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 |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_1801_08432 |
| institution | arXiv |
| publishDate | 2018 |
| record_format | arxiv |
| spellingShingle | BIGSTICK: A flexible configuration-interaction shell-model code (updated) Johnson, Calvin W. Ormand, W. Erich McElvain, Kenneth S. Zbikowski, Ryan Shan, Hongzhang Computational Physics Nuclear Theory 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 |
| title | BIGSTICK: A flexible configuration-interaction shell-model code (updated) |
| topic | Computational Physics Nuclear Theory |
| url | https://arxiv.org/abs/1801.08432 |