Haɗin sanyi yana nufin nau'in halayen makaman nukiliya wanda ke faruwa a ko kusa da zafin jiki, yana samar da makamashi ba tare da matsanancin zafi da matsin lamba da ake buƙata don halayen haɗakar makaman nukiliya na al'ada ba. Tun asali an yi amfani da kalmar “haɗaɗɗen sanyi” don bayyana gwaje-gwajen da suka bayyana sun haifar da irin wannan amsa a ƙarshen 1980s, amma waɗannan gwaje-gwajen ba a sami nasarar maimaita su ba kuma a halin yanzu ba a ɗauke su a matsayin tushen kuzari.