20.00.00 NUCLEAR PHYSICS
- 21.00.00 Nuclear structure (for nucleon structure, see 14.20.Dh Properties of protons and neutrons; 13.40.-f for electromagnetic processes and properties; 13.60.Hb for deep-inelastic structure functions) (20)
- 23.00.00 Radioactive decay and in-beam spectroscopy (10)
- 24.00.00 Nuclear reactions: general (42)
- 25.00.00 Nuclear reactions: specific reactions (66)
- 26.00.00 Nuclear astrophysics (see also 95.30.-k Fundamental aspects of astrophysics in astronomy) (3)
- 27.00.00 Properties of specific nuclei listed by mass ranges (an additional heading must be chosen with these entries, where the given mass number limits are, to some degree, arbitrary) (12)
- 28.00.00 Nuclear engineering and nuclear power studies
- 29.00.00 Experimental methods and instrumentation for elementary-particle and nuclear physics (6)