Function `adas.wig3j`

def wig3j(j1, j2, j3, m1, m2, m3)

Evaluates the Wigner 3j symbol.

Parameters

j1, j2, j3, m1, m2, m3 : float: j and m angular-momentum quantum numbers

Returns

w3j : float: Wigner 3j

Notes

Calls a fortran based shared object file - not pure python.

The j and m inputs should be integer or half-integer but this is not enforced.

This routine is made available to avoid a dependence on the sympy, or similar, library. Use that library for an extensive set of Wigner, Racah and Clebsch-Gordan coefficients.

References

Version History

Martin O'Mullane, 20-08-2022
- First version

Example

Wigner-3j: (2, 6, 4) = sqrt(715)/143 = 0.18698939 (0, 0, 0)

>>> import adas as adas
>>> adas.wig3j(2, 6, 4, 0, 0, 0)
0.18698939800169143