Microscopic Basis and Introduction to IBM-2
Takaharu Otsuka · 2020
The nuclear force, which combines nucleons together into a nucleus, has two basic components, a short-range attractive interaction between two nucleons, a repulsive core at even shorter distances. The nuclear force should be of short range because of its origin in meson exchange effects. A nucleon inside the nucleus feels an attractive force from surrounding nucleons, and this effect is expressed as the mean potential for the nucleon. The interaction between valence nucleons in the nucleus is different from that between free nucleons due to various medium effects, for instance, the core polarization. The pairing interaction is important also for the proton-proton channel. The proton-neutron interaction differs drastically in character. The boson-boson interaction is comprised of two creation operators and two annihilation operators. The Interacting Boson Model is normally applied to nuclei with masses larger than about 80.