20.	NUCLEAR PHYSICS
21.	Nuclear structure
21.10.-k	Properties of nuclei; nuclear energy levels
21.10.Dr	Nuclear binding energies and masses
21.10.Ft	Nuclear charge distribution
21.10.Gv	Nuclear mass and neutron distributions
21.10.Hw	Nuclear spin, parity, and isobaric spin
21.10.Jx	Nuclear spectroscopic factors
21.10.Ky	Nuclear electromagnetic moments
21.10.Ma	Nuclear level density
21.10.Pc	Nuclear single-particle levels and strength functions
21.10.Re	Nuclear collective levels
21.10.Sf	Nuclear Coulomb energies
21.10.Tg	Nuclear lifetimes
21.30.-x	Nuclear forces
21.30.Cb	Nuclear forces in vacuum
21.30.Fe	Forces in hadronic systems and nuclear effective interactions
21.45.+v	Nuclear few-body systems
21.60.-n	Nuclear structure models and methods
21.60.Cs	Nuclear shell model
21.60.Ev	Nuclear collective models
21.60.Fw	Nuclear models based on group theory
21.60.Gx	Nuclear cluster models
21.60.Jz	Hartree-Fock and random-phase approximations in nuclei
21.60.Ka	Nuclear Monte Carlo models
21.65.+f	Nuclear matter
21.80.+a	Hypernuclei
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	Nuclear electromagnetic transitions
23.20.En	Nuclear angular distribution and correlation measurements
23.20.Gq	Nuclear multipole mixing ratios
23.20.Js	Nuclear multipole matrix elements
23.20.Lv	Nuclear gamma transitions and level energies
23.20.Nx	Nuclear internal conversion and extranuclear effects
23.20.Ra	Nuclear internal pair production
23.40.-s	Beta decay; double beta decay; electron and muon capture
23.40.Bw	Weak-interaction and lepton (including neutrino) aspects of beta decay
23.40.Hc	Beta decay relation with nuclear matrix elements and nuclear structure
23.50.+z	Nuclear decay by proton emission
23.60.+e	Alpha decay
23.70.+j	Heavy-particle decay of nuclei
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 of nuclei
24.10.Eq	Coupled-channel and distorted-wave models of nuclei
24.10.Ht	Optical and diffraction models of nuclei
24.10.Jv	Relativistic models of nuclei
24.10.Lx	Monte Carlo simulations of nuclei (including hadron and parton cascades and string breaking models)
24.10.Nz	Hydrodynamic models of nuclei
24.10.Pa	Thermal and statistical models of nuclei
24.30.-v	Nuclear resonance reactions
24.30.Cz	Nuclear giant resonances
24.30.Gd	Other nuclear resonances
24.50.+g	Direct nuclear reactions
24.60.-k	Statistical theory and fluctuations in nuclei
24.60.Dr	Statistical compound-nucleus reactions
24.60.Gv	Statistical multistep direct reactions in nuclei
24.60.Ky	Fluctuation phenomena in nuclei
24.60.Lz	Chaos in nuclear systems
24.70.+s	Polarization phenomena in nuclear reactions
24.75.+i	General properties of nuclear fission
24.80.+y	Nuclear tests of fundamental interactions and symmetries
24.85.+p	Quarks, gluons, and QCD in nuclei and nuclear processes
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	Nuclear photon absorption and scattering
25.20.Lj	Nuclear photoproduction reactions
25.30.-c	Lepton-induced nuclear reactions
25.30.Bf	Nuclear elastic electron scattering
25.30.Dh	Nuclear inelastic electron scattering to specific states
25.30.Fj	Nuclear inelastic electron scattering to continuum
25.30.Hm	Nuclear positron scattering
25.30.Mr	Nuclear muon scattering (including the EMC effect)
25.30.Pt	Nuclear neutrino scattering
25.30.Rw	Nuclear electroproduction reactions
25.40.-h	Nucleon-induced nuclear reactions
25.40.Cm	Nuclear elastic proton scattering
25.40.Dn	Nuclear elastic neutron scattering
25.40.Ep	Nuclear inelastic proton scattering
25.40.Fq	Nuclear inelastic neutron scattering
25.40.Hs	Nucleon-induced transfer reactions
25.40.Kv	Nucleon-induced charge-exchange reactions
25.40.Lw	Nucleon radiative capture
25.40.Ny	Nucleon-induced resonance reactions
25.40.Qa	(p, pi) reactions
25.40.Sc	Nucleon-induced spallation reactions
25.40.Ve	Other nucleon-induced reactions above meson production thresholds (energies>400 MeV)
25.43.+t	Antiproton-induced reactions
25.45.-z	2H-induced reactions
25.45.De	2H-induced elastic and inelastic scattering
25.45.Hi	2H-induced transfer reactions
25.45.Kk	2H-induced charge-exchange reactions
25.55.-e	3H-, 3He-, and 4He-induced reactions
25.55.Ci	3H-, 3He-, and 4He-induced elastic and inelastic scattering
25.55.Hp	3H-, 3He-, and 4He-induced transfer reactions
25.55.Kr	3H-, 3He-, and 4He-induced charge-exchange reactions
25.60.-t	Reactions induced by unstable nuclei
25.60.Bx	Unstable nucleus induced elastic scattering
25.60.Dz	Unstable nucleus induced interaction and reaction cross sections
25.60.Gc	Unstable nucleus induced breakup and momentum distributions
25.60.Je	Unstable nucleus induced transfer reactions
25.60.Lg	Unstable nucleus induced charge-exchange reactions
25.60.Pj	Unstable nucleus induced fusion reactions
25.70.-z	Low and intermediate energy heavy-ion reactions
25.70.Bc	Elastic and quasielastic scattering of heavy ions
25.70.De	Coulomb excitation by heavy ions
25.70.Ef	Resonances in heavy-ion reactions
25.70.Gh	Compound nucleus in heavy-ion reactions
25.70.Hi	Heavy ion-induced transfer reactions
25.70.Jj	Heavy ion-induced fusion and fusion-fission reactions
25.70.Kk	Heavy ion-induced charge-exchange reactions
25.70.Lm	Heavy ion-induced strongly damped collisions
25.70.Mn	Heavy ion-induced projectile and target fragmentation
25.70.Pq	Heavy ion-induced multifragment emission and correlations
25.75.-q	Relativistic heavy-ion collisions
25.75.Dw	Particle and resonance production in relativistic heavy-ion collisions
25.75.Gz	Particle correlations in relativistic heavy-ion collisions
25.75.Ld	Collective flow in relativistic heavy-ion collisions
25.75.Nq	Quark deconfinement, quark-gluon plasma production, and phase transitions in heavy-ion collisions
25.80.-e	Meson- and hyperon-induced nuclear reactions
25.80.Dj	Pion-nucleus elastic scattering
25.80.Ek	Pion-nucleus inelastic scattering
25.80.Gn	Pion-nucleus charge-exchange reactions
25.80.Hp	Pion-induced nuclear reactions
25.80.Ls	Pion inclusive scattering and absorption in nuclei
25.80.Nv	Kaon-induced nuclear reactions
25.80.Pw	Hyperon-induced nuclear reactions
25.85.-w	Fission reactions
25.85.Ca	Spontaneous fission of nuclei
25.85.Ec	Neutron-induced fission of nuclei
25.85.Ge	Charged-particle-induced fission of nuclei
25.85.Jg	Photofission of nuclei
25.90.+k	Other topics in nuclear reactions: specific reactions (restricted to new topics in section 25)
26.	Nuclear astrophysics
26.20.+f	Hydrostatic stellar nucleosynthesis
26.30.+k	Nucleosynthesis in novae, supernovae and other explosive environments
26.35.+c	Big Bang nucleosynthesis
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
26.65.+t	Solar neutrinos in nuclear astrophysics
27.	Properties of specific nuclei listed by mass ranges
27.10.+h	Properties of nuclei with A(less-than-or-equal-to)5
27.20.+n	Properties of nuclei with 6(less-than-or-equal-to)A(less-than-or-equal-to)19
27.30.+t	Properties of nuclei with 20(less-than-or-equal-to)A(less-than-or-equal-to)38
27.40.+z	Properties of nuclei with 39(less-than-or-equal-to)A(less-than-or-equal-to)58
27.50.+e	Properties of nuclei with 59(less-than-or-equal-to)A(less-than-or-equal-to)89
27.60.+j	Properties of nuclei with 90(less-than-or-equal-to)A149
27.70.+q	Properties of nuclei with 150(less-than-or-equal-to)A(less-than-or-equal-to)189
27.80.+w	Properties of nuclei with 190(less-than-or-equal-to)A(less-than-or-equal-to)219
27.90.+b	Properties of nuclei with 220(less-than-or-equal-to)A
28.	Nuclear engineering and nuclear power studies
28.20.-v	Neutron physics
28.20.Cz	Neutron scattering
28.20.Fc	Neutron absorption
28.20.Gd	Neutron transport: diffusion and moderation
28.41.-i	Fission reactors
28.41.Ak	Theory, design, and computerized simulation of fission reactors
28.41.Bm	Fission reactor fuel elements, preparation, reloading, and reprocessing
28.41.Fr	Fission reactor coolants, reactor cooling, and heat recovery
28.41.Kw	Fission reactor radioactive wastes, waste disposal
28.41.My	Fission reactor control systems
28.41.Pa	Fission reactor moderators
28.41.Qb	Fission reactor structural and shielding materials
28.41.Rc	Fission reactor instrumentation
28.41.Te	Fission reactor protection systems, safety, radiation monitoring, accidents, and dismantling
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 (fission reactors)
28.52.-s	Fusion reactors
28.52.Av	Fusion reactor theory, design, and computerized simulation
28.52.Cx	Fusion reactor fueling, heating and ignition
28.52.Fa	Fusion reactor materials
28.52.Lf	Fusion reactor components and instrumentation
28.52.Nh	Fusion reactor safety
28.60.+s	Isotope separation and enrichment
28.70.+y	Nuclear explosions
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
29.17.+w	Electrostatic, collective, and linear accelerators
29.20.-c	Cyclic accelerators and storage rings
29.20.Dh	Storage rings
29.20.Fj	Betatrons
29.20.Hm	Cyclotrons
29.20.Lq	Synchrotrons
29.25.-t	Particle sources and targets
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
29.27.Ac	Beam injection and extraction in accelerators
29.27.Bd	Beam dynamics; collective effects and instabilities in accelerators
29.27.Eg	Beam handling; beam transport in accelerators
29.27.Fh	Beam characteristics in accelerators
29.27.Hj	Polarized beams in accelerators
29.30.-h	Spectrometers and spectroscopic techniques
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 gamma-ray spectroscopy
29.30.Lw	Nuclear orientation devices
29.40.-n	Radiation detectors
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	Particle calorimeters
29.40.Wk	Solid-state radiation detectors
29.50.+v	Computer interfaces for elementary-particle and nuclear physics
29.85.+c	Computer data analysis for elementary-particle and nuclear physics
29.90.+r	Other topics in elementary-particle and nuclear physics experimental methods and instrumentation (restricted to new topics in section 29)