| 20. | NUCLEAR PHYSICS | |
| 21. | 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) | |
| 21.10.-k | Properties of nuclei; nuclear energy levels (for properties of specific nuclei listed by mass ranges, see section 27) | |
| 21.10.Dr | Binding energies and masses | |
| 21.10.Ft | Charge distribution | |
| 21.10.Gv | Nucleon distributions and halo features | |
| 21.10.Hw | Spin, parity, and isobaric spin | |
| 21.10.Jx | Spectroscopic factors and asymptotic normalization coefficients | |
| 21.10.Ky | Electromagnetic moments | |
| 21.10.Ma | Level density | |
| 21.10.Pc | Single-particle levels and strength functions | |
| 21.10.Re | Collective levels | |
| 21.10.Sf | Coulomb energies, analogue states | |
| 21.10.Tg | Lifetimes, widths | |
| 21.30.-x | Nuclear forces (see also 13.75.Cs Nucleon-nucleon interactions) | |
| 21.30.Cb | Nuclear forces in vacuum | |
| 21.30.Fe | Forces in hadronic systems and effective interactions | |
| 21.45.-v | Few-body systems | |
| 21.45.Bc | Two-nucleon system | |
| 21.45.Ff | Three-nucleon forces | |
| 21.60.-n | Nuclear structure models and methods | |
| 21.60.Cs | Shell model | |
| 21.60.De | Ab initio methods | |
| 21.60.Ev | Collective models | |
| 21.60.Fw | Models based on group theory | |
| 21.60.Gx | Cluster models | |
| 21.60.Jz | Nuclear Density Functional Theory and extensions (includes Hartree-Fock and random-phase approximations) | |
| 21.60.Ka | Monte Carlo models | |
| S | 21.65.-f | Nuclear matter |
| M | 21.65.-f | Nuclear matter (for exotic atoms and molecules, see 36.10.-k) |
| 21.65.Cd | Asymmetric matter, neutron matter | |
| 21.65.Ef | Symmetry energy | |
| 21.65.Jk | Mesons in nuclear matter | |
| 21.65.Mn | Equations of state of nuclear matter (see also 26.60.Kp Equations of state of neutron-star matter) | |
| 21.65.Qr | Quark matter (see also 12.38.Mh Quark-gluon plasma in quantum chromodynamics; 25.75.Nq Quark deconfinement, quark-gluon plasma production and phase transitions in relativistic heavy-ion collisions) | |
| 21.80.+a | Hypernuclei | |
| 21.85.+d | Mesic nuclei | |
| 21.90.+f | Other topics in nuclear structure (restricted to new topics in section 21) | |
| 23. | Radioactive decay and in-beam spectroscopy | |
| 23.20.-g | Electromagnetic transitions | |
| 23.20.En | Angular distribution and correlation measurements | |
| 23.20.Gq | Multipole mixing ratios | |
| 23.20.Js | Multipole matrix elements | |
| 23.20.Lv | γ transitions and level energies | |
| 23.20.Nx | Internal conversion and extranuclear effects (including Auger electrons and internal bremsstrahlung) | |
| 23.20.Ra | Internal pair production | |
| 23.35.+g | Isomer decay | |
| 23.40.-s | β decay; double β decay; electron and muon capture | |
| 23.40.Bw | Weak-interaction and lepton (including neutrino) aspects (see also 14.60.Pq Neutrino mass and mixing) | |
| 23.40.Hc | Relation with nuclear matrix elements and nuclear structure | |
| 23.50.+z | Decay by proton emission | |
| 23.60.+e | α decay | |
| 23.70.+j | Heavy-particle decay | |
| 23.90.+w | Other topics in radioactive decay and in-beam spectroscopy (restricted to new topics in section 23) | |
| 24. | Nuclear reactions: general | |
| 24.10.-i | Nuclear reaction models and methods | |
| 24.10.Cn | Many-body theory | |
| 24.10.Eq | Coupled-channel and distorted-wave models | |
| 24.10.Ht | Optical and diffraction models | |
| 24.10.Jv | Relativistic models | |
| 24.10.Lx | Monte Carlo simulations (including hadron and parton cascades and string breaking models) | |
| 24.10.Nz | Hydrodynamic models | |
| 24.10.Pa | Thermal and statistical models | |
| 24.30.-v | Resonance reactions | |
| 24.30.Cz | Giant resonances | |
| 24.30.Gd | Other resonances | |
| 24.50.+g | Direct reactions | |
| 24.60.-k | Statistical theory and fluctuations | |
| 24.60.Dr | Statistical compound-nucleus reactions | |
| 24.60.Gv | Statistical multistep direct reactions | |
| 24.60.Ky | Fluctuation phenomena | |
| 24.60.Lz | Chaos in nuclear systems | |
| 24.70.+s | Polarization phenomena in reactions | |
| 24.75.+i | General properties of fission | |
| 24.80.+y | Nuclear tests of fundamental interactions and symmetries | |
| 24.85.+p | Quarks, gluons, and QCD in nuclear reactions | |
| 24.87.+y | Surrogate reactions | |
| 24.90.+d | Other topics in nuclear reactions: general (restricted to new topics in section 24) | |
| 25. | Nuclear reactions: specific reactions | |
| 25.10.+s | Nuclear reactions involving few-nucleon systems | |
| 25.20.-x | Photonuclear reactions | |
| 25.20.Dc | Photon absorption and scattering | |
| 25.20.Lj | Photoproduction reactions | |
| 25.30.-c | Lepton-induced reactions | |
| 25.30.Bf | Elastic electron scattering | |
| 25.30.Dh | Inelastic electron scattering to specific states | |
| 25.30.Fj | Inelastic electron scattering to continuum | |
| 25.30.Hm | Positron-induced reactions | |
| 25.30.Mr | Muon-induced reactions (including the EMC effect) | |
| 25.30.Pt | Neutrino-induced reactions | |
| 25.30.Rw | Electroproduction reactions | |
| 25.40.-h | Nucleon-induced reactions (see also 28.20.-v Neutron physics) | |
| 25.40.Cm | Elastic proton scattering | |
| 25.40.Dn | Elastic neutron scattering | |
| 25.40.Ep | Inelastic proton scattering | |
| 25.40.Fq | Inelastic neutron scattering | |
| 25.40.Hs | Transfer reactions | |
| 25.40.Kv | Charge-exchange reactions | |
| 25.40.Lw | Radiative capture | |
| 25.40.Ny | Resonance reactions | |
| 25.40.Qa | (p, π) reactions | |
| 25.40.Sc | Spallation reactions | |
| 25.40.Ve | Other reactions above meson production thresholds (energies > 400 MeV) | |
| 25.43.+t | Antiproton-induced reactions | |
| 25.45.-z | 2H-induced reactions | |
| 25.45.De | Elastic and inelastic scattering | |
| 25.45.Hi | Transfer reactions | |
| 25.45.Kk | Charge-exchange reactions | |
| 25.55.-e | 3H-, 3He-, and 4He-induced reactions | |
| 25.55.Ci | Elastic and inelastic scattering | |
| 25.55.Hp | Transfer reactions | |
| 25.55.Kr | Charge-exchange reactions | |
| 25.60.-t | Reactions induced by unstable nuclei | |
| 25.60.Bx | Elastic scattering | |
| 25.60.Dz | Interaction and reaction cross sections | |
| 25.60.Gc | Breakup and momentum distributions | |
| 25.60.Je | Transfer reactions | |
| 25.60.Lg | Charge-exchange reactions | |
| 25.60.Pj | Fusion reactions | |
| 25.60.Tv | Radiative capture | |
| 25.70.-z | Low and intermediate energy heavy-ion reactions | |
| 25.70.Bc | Elastic and quasielastic scattering | |
| 25.70.De | Coulomb excitation | |
| 25.70.Ef | Resonances | |
| 25.70.Gh | Compound nucleus | |
| 25.70.Hi | Transfer reactions | |
| 25.70.Jj | Fusion and fusion-fission reactions | |
| 25.70.Kk | Charge-exchange reactions | |
| 25.70.Lm | Strongly damped collisions | |
| 25.70.Mn | Projectile and target fragmentation | |
| 25.70.Pq | Multifragment emission and correlations | |
| 25.75.-q | Relativistic heavy-ion collisions (collisions induced by light ions studied to calibrate relativistic heavy-ion collisions should be classified under both 25.75.-q and sections 13 or 25 appropriate to the light ions) | |
| 25.75.Ag | Global features in relativistic heavy ion collisions | |
| 25.75.Bh | Hard scattering in relativistic heavy ion collisions | |
| 25.75.Cj | Photon, lepton, and heavy quark production in relativistic heavy ion collisions | |
| 25.75.Dw | Particle and resonance production | |
| 25.75.Gz | Particle correlations and fluctuations | |
| 25.75.Ld | Collective flow | |
| 25.75.Nq | Quark deconfinement, quark-gluon plasma production, and phase transitions (see also 12.38.Mh Quark-gluon plasma in quantum chromodynamics; 21.65.Qr Quark matter in nuclear matter) | |
| 25.80.-e | Meson- and hyperon-induced reactions | |
| 25.80.Dj | Pion elastic scattering | |
| 25.80.Ek | Pion inelastic scattering | |
| 25.80.Gn | Pion charge-exchange reactions | |
| 25.80.Hp | Pion-induced reactions | |
| 25.80.Ls | Pion inclusive scattering and absorption | |
| 25.80.Nv | Kaon-induced reactions | |
| 25.80.Pw | Hyperon-induced reactions | |
| 25.85.-w | Fission reactions | |
| 25.85.Ca | Spontaneous fission | |
| 25.85.Ec | Neutron-induced fission | |
| 25.85.Ge | Charged-particle-induced fission | |
| 25.85.Jg | Photofission | |
| 25.90.+k | Other topics in nuclear reactions: specific reactions (restricted to new topics in section 25) | |
| 26. | Nuclear astrophysics (see also 95.30.-k Fundamental aspects of astrophysics in astronomy) | |
| 26.20.-f | Hydrostatic stellar nucleosynthesis (see also 97.10.Cv Stellar structure, interiors, evolution, nucleosynthesis, ages in astronomy) | |
| 26.20.Cd | Stellar hydrogen burning | |
| 26.20.Fj | Stellar helium burning | |
| 26.20.Kn | s-process | |
| 26.20.Np | Nucleosynthesis in late stellar evolution | |
| 26.20.Qr | Quasistatistical processes | |
| 26.30.-k | Nucleosynthesis in novae, supernovae, and other explosive environments | |
| 26.30.Ca | Explosive burning in accreting binary systems (novae, x-ray bursts) | |
| 26.30.Ef | Explosive burning in supernovae shock fronts | |
| 26.30.Hj | r-process | |
| 26.30.Jk | Weak interaction and neutrino induced processes, galactic radioactivity | |
| 26.35.+c | Big Bang nucleosynthesis (see also 98.80.Ft Origin, formation, and abundances of the elements in astronomy) | |
| 26.40.+r | Cosmic ray nucleosynthesis | |
| 26.50.+x | Nuclear physics aspects of novae, supernovae, and other explosive environments | |
| 26.60.-c | Nuclear matter aspects of neutron stars | |
| 26.60.Dd | Neutron star core | |
| 26.60.Gj | Neutron star crust | |
| 26.60.Kp | Equations of state of neutron-star matter | |
| 26.65.+t | Solar neutrinos (see also 96.60.Vg Particle emission, solar wind in solar physics) | |
| 26.90.+n | Other topics in nuclear astrophysics (restricted to new topics in section 26) | |
| 27. | 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) | |
| 27.10.+h | A ≤ 5 | |
| 27.20.+n | 6 ≤ A ≤ 19 | |
| 27.30.+t | 20 ≤ A ≤ 38 | |
| 27.40.+z | 39 ≤ A ≤ 58 | |
| 27.50.+e | 59 ≤ A ≤ 89 | |
| 27.60.+j | 90 ≤ A ≤ 149 | |
| 27.70.+q | 150 ≤ A ≤ 189 | |
| 27.80.+w | 190 ≤ A ≤ 219 | |
| 27.90.+b | A ≥ 220 | |
| 28. | Nuclear engineering and nuclear power studies | |
| 28.20.-v | Neutron physics (see also 25.40.-h Nucleon-induced reactions and 25.85.Ec Neutron-induced fission) | |
| 28.20.Cz | Neutron scattering | |
| 28.20.Fc | Neutron absorption | |
| 28.20.Gd | Neutron transport: diffusion and moderation | |
| 28.20.Ka | Thermal neutron cross sections | |
| 28.20.Np | Neutron capture γ-rays | |
| N | 28.20.Pr | Neutron imaging; neutron tomography |
| 28.41.-i | Fission reactors (see also 89.30.Gg nuclear fission power in energy resources) | |
| 28.41.Ak | Theory, design, and computerized simulation | |
| 28.41.Bm | Fuel elements, preparation, reloading, and reprocessing | |
| 28.41.Fr | Reactor coolants, reactor cooling, and heat recovery | |
| 28.41.Kw | Radioactive wastes, waste disposal | |
| 28.41.My | Reactor control systems | |
| 28.41.Pa | Moderators | |
| 28.41.Qb | Structural and shielding materials | |
| 28.41.Rc | Instrumentation | |
| 28.41.Te | Protection systems, safety, radiation monitoring, accidents, and dismantling | |
| 28.41.Vx | Fuel cycles | |
| 28.50.-k | Fission reactor types | |
| 28.50.Dr | Research reactors | |
| 28.50.Ft | Fast and breeder reactors | |
| 28.50.Hw | Power and production reactors | |
| 28.50.Ky | Propulsion reactors | |
| 28.50.Ma | Auxiliary generators | |
| 28.52.-s | Fusion reactors (see also 52.55.-s Magnetic confinement and equilibrium, 52.57.-z Laser inertial confinement, and 52.58.-c Other confinement methods in physics of plasmas; 89.30.Jj Nuclear fusion power in energy resources) | |
| 28.52.Av | Theory, design, and computerized simulation | |
| 28.52.Cx | Fueling, heating and ignition | |
| 28.52.Fa | Materials | |
| 28.52.Lf | Components and instrumentation | |
| 28.52.Nh | Safety (see also 87.55.N- Radiation monitoring, control, and safety in biological and medical physics) | |
| 28.60.+s | Isotope separation and enrichment | |
| 28.65.+a | Accelerator-driven transmutation of nuclear waste | |
| 28.70.+y | Nuclear explosions (see also 47.40.-x Compressible flows; shock waves; for radiation protection from fallout, see 87.53.Bn; for nuclear explosion seismology, see 91.30.Rz) | |
| 28.90.+i | Other topics in nuclear engineering and nuclear power studies (restricted to new topics in section 28) | |
| 29. | Experimental methods and instrumentation for elementary-particle and nuclear physics | |
| 29.20.-c | Accelerators (for accelerators used in medical applications, see 87.56.bd) | |
| 29.20.Ba | Electrostatic accelerators | |
| 29.20.D- | Cyclic accelerators and storage rings | |
| 29.20.db | Storage rings and colliders | |
| 29.20.df | Betatrons | |
| 29.20.dg | Cyclotrons | |
| 29.20.dk | Synchrotrons | |
| 29.20.Ej | Linear accelerators | |
| 29.25.-t | Particle sources and targets (see also 52.59.-f Intense particle beams and radiation sources in physics of plasmas; 87.56.bg Radioactive sources in medical physics) | |
| 29.25.Bx | Electron sources | |
| 29.25.Dz | Neutron sources | |
| 29.25.Lg | Ion sources: polarized | |
| 29.25.Ni | Ion sources: positive and negative | |
| 29.25.Pj | Polarized and other targets | |
| 29.25.Rm | Sources of radioactive nuclei | |
| 29.27.-a | Beams in particle accelerators (for low energy charged-particle beams, see 41.75.-i and 41.85.-p) | |
| 29.27.Ac | Beam injection and extraction | |
| 29.27.Bd | Beam dynamics; collective effects and instabilities | |
| 29.27.Eg | Beam handling; beam transport | |
| 29.27.Fh | Beam characteristics | |
| 29.27.Hj | Polarized beams | |
| S | 29.30.-h | Spectrometers and spectroscopic techniques |
| M | 29.30.-h | Spectrometers and spectroscopic techniques (for energy loss and stopping power, see 34.50.Bw in atomic physics, and 61.85.+p in condensed matter physics) |
| 29.30.Aj | Charged-particle spectrometers: electric and magnetic | |
| 29.30.Dn | Electron spectroscopy | |
| 29.30.Ep | Charged-particle spectroscopy | |
| 29.30.Hs | Neutron spectroscopy | |
| 29.30.Kv | X- and γ-ray spectroscopy | |
| 29.30.Lw | Nuclear orientation devices | |
| 29.38.-c | Radioactive beams | |
| 29.38.Db | Fast radioactive beam techniques | |
| 29.38.Gj | Reaccelerated radioactive beams | |
| 29.40.-n | Radiation detectors (for mass spectrometers, see 07.75.+h; see also 95.55.Vj Neutrino, muon, pion, and other particle detectors; cosmic ray detectors in astronomy) | |
| 29.40.Cs | Gas-filled counters: ionization chambers, proportional, and avalanche counters | |
| 29.40.Gx | Tracking and position-sensitive detectors | |
| 29.40.Ka | Cherenkov detectors | |
| 29.40.Mc | Scintillation detectors | |
| 29.40.Rg | Nuclear emulsions | |
| 29.40.Vj | Calorimeters | |
| 29.40.Wk | Solid-state detectors | |
| 29.50.+v | Computer interfaces | |
| 29.85.-c | Computer data analysis | |
| 29.85.Ca | Data acquisition and sorting | |
| 29.85.Fj | Data analysis | |
| 29.87.+g | Nuclear data compilation | |
| 29.90.+r | Other topics in elementary-particle and nuclear physics experimental methods and instrumentation (restricted to new topics in section 29) | |