Interacting boson model


The interacting boson model is a model in nuclear physics in which
nucleons pair up, essentially
acting as a single particle with boson properties, with
integral spin of 0, 2 or 4.
It is sometimes known as the Interacting boson approximation.
The IBM1/IBM-I model treats both types of nucleons the same and considers only pairs of nucleons coupled to
total angular momentum 0 and 2, called respectively, s and d bosons.
The IBM2/IBM-II model treats protons and neutrons separately.
Both models are restricted to nuclei with even numbers of protons and neutrons.
The model can be used to predict vibrational and rotational modes of non-spherical nuclei.

History

This model was invented by Akito Arima and Francesco Iachello in 1974.