This quantity is not exactly defined. It is given approximately for nuclei in their ground state only by $R = r_0 A^{\frac{1}{3}}$, where $r_0 \approx 1.2 x 10^{-15} m$ and $A$ is the nucleon number.
{"resource":"Nuclear Radius"
,"qname":"quantitykind:NuclearRadius"
,"uri":"http:\/\/qudt.org\/vocab\/quantitykind\/NuclearRadius"
,"properties":["applicable unit":"unit:ANGSTROM"
,"applicable unit":"unit:AU"
,"applicable unit":"unit:BTU_IT-PER-LB_F"
,"applicable unit":"unit:CH"
,"applicable unit":"unit:CHAIN_US"
,"applicable unit":"unit:CentiM"
,"applicable unit":"unit:DecaM"
,"applicable unit":"unit:DeciM"
,"applicable unit":"unit:FATH"
,"applicable unit":"unit:FM"
,"applicable unit":"unit:FT"
,"applicable unit":"unit:FT_US"
,"applicable unit":"unit:FUR"
,"applicable unit":"unit:FUR_Long"
,"applicable unit":"unit:FemtoM"
,"applicable unit":"unit:GAUGE_FR"
,"applicable unit":"unit:GA_Charriere"
,"applicable unit":"unit:HectoM"
,"applicable unit":"unit:IN"
,"applicable unit":"unit:KiloM"
,"applicable unit":"unit:LY"
,"applicable unit":"unit:M"
,"applicable unit":"unit:MI"
,"applicable unit":"unit:MI_N"
,"applicable unit":"unit:MI_US"
,"applicable unit":"unit:MicroIN"
,"applicable unit":"unit:MicroM"
,"applicable unit":"unit:MilLength"
,"applicable unit":"unit:MilliIN"
,"applicable unit":"unit:MilliM"
,"applicable unit":"unit:NanoM"
,"applicable unit":"unit:PARSEC"
,"applicable unit":"unit:PCA"
,"applicable unit":"unit:PT"
,"applicable unit":"unit:PicoM"
,"applicable unit":"unit:PlanckLength"
,"applicable unit":"unit:ROD"
,"applicable unit":"unit:YD"
,"applicable unit":"unit:ZOLL"
,"comment":"Applicable units are those of quantitykind:Length"
,"description":"\"Nuclear Radius\" is the conventional radius of sphere in which the nuclear matter is included"
,"description (plain text)":"\"Nuclear Radius\" is the conventional radius of sphere in which the nuclear matter is included"
,"has broader":"quantitykind:Length"
,"has dimension vector":"dimension:A0E0L1I0M0H0T0D0"
,"informative reference":"http:\/\/en.wikipedia.org\/wiki\/Atomic_nucleus"
,"isDefinedBy":"<http:\/\/qudt.org\/2.1\/vocab\/quantitykind>"
,"label":"Nuclear Radius"
,"latex definition":"This quantity is not exactly defined. It is given approximately for nuclei in their ground state only by $R = r_0 A^{\\frac{1}{3}}$, where $r_0 \\approx 1.2 x 10^{-15} m$ and $A$ is the nucleon number."
,"normative reference":"http:\/\/www.iso.org\/iso\/catalogue_detail?csnumber=31895"
,"symbol":"R"
,"type":"qudt:QuantityKind"
]}