Physics - Modern Physics Question with Solution | TestHub

The given nuclear reaction represents positron emission (${\beta }^{+}$ decay).

In ${\beta }^{+}$ decay, a proton inside the nucleus is converted into a neutron, a positron (${\beta }^{+}$), and a neutrino ($\nu$).

The general equation for ${\beta }^{+}$ decay is:

${}_Z^A\mathrm{X}⟶{}_{Z-1}^A\mathrm{Y}+{}_{+1}^0\beta +\nu$

Comparing this with the given reaction:

${}_6^{11}\mathrm{C}⟶{}_5^{11}\mathrm{B}+{\beta }^{+}+\mathrm{X}$

The particle $\mathrm{X}$ is a neutrino.

Answer: neutrino