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Isotopes with half life more than 3 minutes are listed Fr, more than 10 minutes for all other cases.

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N.J. Stone, Table of recommended nuclear magnetic dipole moments: Part I, long-lived states, INDC(NDS)-079 Available online

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Juris Meija et al., Isotopic compositions of the elements 2013 (IUPAC Technical Report), Pure Appl. Chem. 88, 293 (2016), DOI

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I. Angeli, K.P. Marinova,Table of experimental nuclear ground state charge radii: An update, Atomic Data and Nuclear Data Tables 99, 69 (2013), DOI, Weblink

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N.J. Stone, Table of nuclear electric quadrupole moments, At. Data Nucl. Data Tables 111-112, 1 (2016), DOI

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Isotope info

Half-life info

Natural abundance (%) info
Nuclear spin

Rms radii (fm) info

Magnetic moment (μN) info Quadrupole moment (b) info
223Ra 223 Ra 11.43 days 3/2 5.6973(253) 5.6973 0.0253 0.2692(8) 0.2692 0.0008 1.21(3) 1.21 0.03
225Ra 225 Ra 14.9 days 1/2 5.7150(279) 5.715 0.0279 -0.730(2) -0.73 0.002
226Ra 226 Ra 1599 years 0 5.7211(288) 5.7211 0.0288
227Ra 227 Ra 42.2 minutes 3/2 5.7283(300) 5.7283 0.03 -0.4010(11) -0.401 0.0011 1.53(6) 1.53 0.06
Isotope State    Theory    Experiment
223Ra+ 7s1/2 3398.3(2.9) E60
3404.0(1.9) E61
6d3/2 79.56 E59
6d5/2 -24.08 E59
7p1/2 671.5 E59 667.1(2.1) E60
7p3/2 54.4 E59 56.5(8) E61
213Ra+ 7s1/2 22920(6) E60
7p1/2 4542(7) E116
4525(5) E60
6d3/2 528(5) E116
State Property Theory
6d3/2 Lifetime 0.6382(94) s
6d5/2 Lifetime 0.3028(37) s
   Initial
 
   Final
 
   Transition
 
   Wavelength (nm) Matrix element    Units
 
Transition rate (s -1 ) Branching ratio
6d3/2 7s1/2 E2 827.522 14.74(11) a.u. 1.567(23) 1
6d5/2 7s1/2 E2 727.644 18.85(11) a.u. 3.253(39) 0.98505
6d5/2 6d3/2 M1 6028.8 1.551 μB 0.0494 0.01495