Figure 3 (IMAGE) Osaka University Caption Illustration of spin-orbit coupling force. Atomic nuclei gain extra stability when the angular orbital momentum and spin of a proton or neutron are in the same direction. Credit Hooi Jin Ong Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.