Physicists pin down the proton-halo state in Flourine-17

A halo nucleus has one or more nucleons that are only weakly bound to the nuclear core. Consequently, they drift far away from it, forming, in effect, a halo. These nuclei are difficult to study because their lives are both short and fragile. The more tools scientists have to calculate the properties of nuclei, the more clearly they can investigate the limits of nuclear existence.

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