The type of nuclear decay which is shown in the question by the lithium is beta minus decay.
When an unstable radioactive nuclei will emit beta particle for the formation of stable nuclei, the process will known as beta decay.
Beta decay if of two types:
As in the given question after radio active decay we get the daughter nuclei with greater atomic mass than parent nuclei, so given decay is beta minus decay.
Hence resultant decay of the helium is beta minus.
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