Main Page | See live article | Alphabetical index The Interacting Boson Model (IBM) is a model in nuclear physics in which nucleons (protons or neutrons) pair up, essentially acting as a single particle with boson properties, with integral spin of 0, 2 or 4. The IBM-I treats both types of nucleons the same. The IBM-II treats protons and neutrons separately. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.