noun
deuteron
Technical term in nuclear physics for the nucleus of deuterium, consisting of one proton and one neutron.
重陽子は陽子と中性子からなる。
A deuteron consists of a proton and a neutron.
陽子 (proton) is a single particle; 重陽子 contains a proton and a neutron.
Compound of 重 (heavy) + 陽子 (proton), referring to the heavier nucleus of deuterium compared to a single proton.