x1 pertains/is related to/reflects (the) weak nuclear force [fundamental interaction] in manner/with properties/in state/with realization x2, coupling to x3 in manner/with strength x4
Also: possibly radioactive/nuclear/atomic decay/emission/fission (especially in connection with dirce). Proposed short rafsi: -vul-. See also: jikfi, tsaba, dicma, grava, xigzo