Cikin neutron yana nufin yawa ko adadin neutron da ke cikin wani sarari ko mahalli da aka bayar. Ma'auni ne na adadin neutron da ke wucewa ta wani yanki na musamman a kowace raka'a na lokaci. Juyin Neutron muhimmin ma'auni ne a cikin ilimin kimiyyar nukiliya da injiniyanci, saboda yana taka muhimmiyar rawa wajen tantance halaye da kaddarorin halayen nukiliya da tsarin nukiliya. Nau'in juzu'in neutron yawanci ana bayyana shi a cikin neutrons a kowace centimita murabba'in daƙiƙa (n/cm²/s).