IPA: //nɒnˈɪntərˌæktɪŋ//
KK: /nɑnˈɪntərˌæktɪŋ/
Not engaging or communicating with others; not having any interaction.
The two particles are considered noninteracting in this experiment.
Noninteracting → It is formed from "non-" (meaning not) and "interact" (from Latin "inter-" meaning between and "agere" meaning to act). The word describes a state where entities do not act or influence each other between them.
Think of 'not' ('non-') acting 'between' ('inter-') — that's why noninteracting means not influencing each other.