Such a nucleus is often too heavy for its charge and might emit an electron (beta particle) to attain a more stable state. (britannica.com)
The model has two stable states with two points of abrupt climate change — the latter at the transitions from the blue lines to the red from above and below. (watertechbyrie.com)
Solid lines represent stable states, and the system usually sticks to these paths like a ball in a track. (blogs.nature.com)