“Know how to solve every problem that has been solved.” “What I cannot create, I do not understand.” — Richard Feynman

m-scheme shell model CI (from scratch)

283 lines of Python: sd-shell configuration interaction with the USDB interaction — bitstring basis, fermionic phase rules, sparse Lanczos. Validated against two production codes run on the same machine: ¹⁸O matches cosmo to every printed digit; ²⁴Mg (dim 28,503) matches cosmo and BIGSTICK to 4 decimals. Results files included.

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• gen_shell_model.py 283 lines · 11.9 KB • results_18O.txt 13 lines · 274 B • results_24Mg.txt 31 lines · 1.2 KB