Blue toruses = 9 protons
Red toruses = 7 nuclear electrons
Atomic number of He (2) = protons (9) - nuclear electrons (7)
Helium 9 decays by neutron emission of Helium 9 neutron excess to Helium 8
Helium 8 decays by electron emission (from the left position) of Helium 8 decay form to Lithium 8.
Lithium 8 decays by electron emission of Lithium 8 destabilized form through Be8 producing two He4 nucleus (stable).
(The neutron and the subsequent electron emission really happens from the end of the nuclear nanotube, NOT from the central position. Im just depict central neutrons for the sake of picturesque symmetry.)
Click on image for Helium 8 nucleus
Yin-yang model of photon and matter
Structures of atomic nuclei of elements
Helium 9 neutron emission mechanism and torus model of emitted particle of neutron. Neutron not an individual particle, it always just a combined proton and electron torus pair snapping proton into electron torus.