Editing Nucleon (section)

===Nucleons===
{| class="wikitable sortable"  style="text-align:center; width:100%;"
|+ Nucleons (''[[Isospin|I]]'' = {{sfrac|1|2}}; ''[[strangeness|S]]'' = ''[[charm (quantum number)|C]]'' = ''[[bottomness|B]]'' = 0)
|-
! Particle <br />name
! class="unsortable" | Symbol
! class="unsortable" | Quark <br />content
! [[Mass]]<sup>{{ref|nucleonmass|[a]}}</sup>
! ''[[Isospin|I]]''<sub>3</sub>
! ''[[Total angular momentum|J]]''<sup>''[[Parity (physics)|P]]''</sup>
! ''[[Electric charge|Q]]''
! [[Magnetic moment]] ([[Nuclear magneton|''μ''<sub>N</sub>]])
! [[Mean lifetime]]
! class="unsortable" | Commonly decays to
|-
| style="text-align:left;" | [[proton]]<ref name=PDGProton group="PDG">[http://pdg.lbl.gov/2010/listings/rpp2010-list-p.pdf Particle listings – {{SubatomicParticle|Proton}}] {{Webarchive|url=https://web.archive.org/web/20170127034547/http://pdg.lbl.gov/2010/listings/rpp2010-list-p.pdf |date=2017-01-27 }}.</ref>
| {{SubatomicParticle|Proton}} / {{SubatomicParticle|Proton+}} / {{SubatomicParticle|Nucleon+}}
| {{SubatomicParticle|link=yes|Up quark}}{{SubatomicParticle|Up quark}}{{SubatomicParticle|link=yes|Down quark}}
| {{sort|1.00727646688|{{val|938.272013|(23)|ul=MeV/c2}} {{val|1.00727646677|(10)|ul=Da}}}}
| {{sort|0.5|+{{sfrac|1|2}}}}
| {{sort|0.5|{{sfrac|1|2}}}}<sup>+</sup>
| {{sort|1|{{val|+1|ul=e}}}}
| {{sort|2.7|{{val|2.792847356|(23)}}}}
| {{sort|+10|stable}}<sup>{{ref|protonlifetime|[b]}}</sup>
| unobserved
|-
| style="text-align:left;" | [[neutron]]<ref name=PDGNeutron group="PDG">[http://pdg.lbl.gov/2010/listings/rpp2010-list-n.pdf Particle listings – {{SubatomicParticle|Neutron}}] {{Webarchive|url=https://web.archive.org/web/20181003230501/http://pdg.lbl.gov/2010/listings/rpp2010-list-n.pdf |date=2018-10-03 }}.</ref>
| {{SubatomicParticle|Neutron}} / {{SubatomicParticle|Neutron0}} / {{SubatomicParticle|Nucleon0}}
| {{SubatomicParticle|Up quark}}{{SubatomicParticle|Down quark}}{{SubatomicParticle|Down quark}}
| {{sort|1.00866491560|{{val|939.565346|(23)|ul=MeV/c2}} {{val|1.00866491597|(43)|ul=Da}}}}
| {{sort|-0.5|{{sfrac|−|1|2}}}}
| {{sort|0.5|{{sfrac|1|2}}}}<sup>+</sup>
| {{sort|0|{{val|0|ul=e}}}}
| {{sort|-1.9|{{val|-1.91304273|(45)}}}}
| {{sort|+2|{{val|885.7|(8)|ul=s}}}}<sup>{{ref|neutronlifetime|[c]}}</sup>
| {{nowrap|{{SubatomicParticle|link=yes|Proton}} + {{SubatomicParticle|link=yes|Electron}} + {{SubatomicParticle|link=yes|Electron antineutrino}}}}
|-
| style="text-align:left;" | [[antiproton]]
| {{SubatomicParticle|Antiproton}} / {{PhysicsParticle|p|TR=−}} / {{PhysicsParticle|N|TR=−}}
| {{SubatomicParticle|Up antiquark}}{{SubatomicParticle|Up antiquark}}{{SubatomicParticle|Down antiquark}}
| {{sort|1.00727646688|{{val|938.272013|(23)|ul=MeV/c2}} {{val|1.00727646677|(10)|ul=Da}}}}
| {{sort|-0.5|{{sfrac|−|1|2}}}}
| {{sort|0.5|{{sfrac|1|2}}}}<sup>+</sup>
| {{sort|-1|{{val|-1|ul=e}}}}
| {{sort|-2.7|{{val|-2.793|(6)}}}}
| {{sort|+10|stable}}<sup>{{ref|protonlifetime|[b]}}</sup>
| unobserved
|-
| style="text-align:left;" | [[antineutron]]
| {{SubatomicParticle|Antineutron}} / {{SubatomicParticle|Antineutron0}} / {{SubatomicParticle|Antinucleon0}}
| {{SubatomicParticle|Up antiquark}}{{SubatomicParticle|Down antiquark}}{{SubatomicParticle|Down antiquark}}
| {{sort|1.00866491560|{{val|939.485|(51)|ul=MeV/c2}} {{val|1.00866491597|(43)|ul=Da}}}}
| {{sort|0.5|{{sfrac|+|1|2}}}}
| {{sort|0.5|{{sfrac|1|2}}}}<sup>+</sup>
| {{sort|0|{{val|0|ul=e}}}}
| ?
| {{sort|+2|{{val|885.7|(8)|ul=s}}}}<sup>{{ref|neutronlifetime|[c]}}</sup>
| {{nowrap|{{SubatomicParticle|link=yes|Antiproton}} + {{SubatomicParticle|link=yes|Positron}} + {{SubatomicParticle|link=yes|Electron neutrino}}}}
|}
{{note|nucleonmass|a}} The masses of the proton and neutron are known with far greater precision in [[Dalton (unit)|dalton]]s (Da) than in MeV/''c''<sup>2</sup> due to the way in which these are defined. The conversion factor used is 1&nbsp;Da&nbsp;=&nbsp;{{val|931.494028|(23)|u=MeV/c2}}.

{{note|protonlifetime|b}} At least 10<sup>35</sup> years. See [[proton decay]].

{{note|neutronlifetime|c}} For [[free neutron]]s; in most common nuclei, neutrons are stable.

The masses of their antiparticles are assumed to be identical, and no experiments have refuted this to date. Current experiments show any relative difference between the masses of the proton and antiproton must be less than {{val|2|e=-9}}<ref group="PDG" name="PDGProton" /> and the difference between the neutron and antineutron masses is on the order of {{val|9|6|e=-5|u=MeV/c2}}.<ref name=PDGNeutron group="PDG"/>

{| class="wikitable"
|+ Proton–antiproton CPT invariance tests
|-
! Test
! Formula
! PDG result<ref name=PDGProton group="PDG"/>
|-
| [[Mass]]
| <math>\frac{|m_{\rm p}-m_\bar{\rm p}|}{m_{\rm p}}</math>
| <{{val|2|e=-9}}
|-
| [[Charge-to-mass ratio]]
| <math>\frac{\left|\frac{q_\bar{\rm p}}{m_\bar{\rm p}}\right|}{\left(\frac{q_{\rm p}}{m_{\rm p}}\right)}</math>
| {{val|0.99999999991|(9)}}
|-
| Charge-to-mass-to-mass ratio
| <math>\frac{\left|\frac{q_\bar{\rm p}}{m_\bar{\rm p}}\right| - \frac{q_{\rm p}}{m_{\rm p}}}{\frac{q_{\rm p}}{m_{\rm p}}}</math>
| {{val|-9|9|e=-11}}
|-
| Charge
| <math>\frac{\left|q_{\rm p} + q_\bar{\rm p}\right|}{e}</math>
| <{{val|2|e=-9}}
|-
| Electron charge
| <math>\frac{\left|q_{\rm p} + q_{\rm e}\right|}{e}</math>
| <{{val|1|e=-21}}
|-
| Magnetic moment
| <math>\frac{\left|\mu_{\rm p} + \mu_\bar{p}\right|}{\mu_{\rm p}}</math>
| {{val|-0.1|2.1|e=-3}}
|}