Authors: Balraj Singh, M.S. Basunia, Murray Martin Et Al., |  Citation: Nucl. Data Sheets 160, 405 (2019) |  Cutoff date: 30-Oct-2019 

 Full ENSDF file | Adopted Levels (PDF version) 

Q(β-)=2881 keV 12S(n)= 4368 keV 13S(p)= 5074 keV 13Q(α)= 6874 keV 3
Reference: 2017WA10

General Comments:

2019Ba22: hyperfine-structure measurements for the 795-nm atomic transitions in 218At at CERN-ISOLDE, using the in-source resonance-ionization laser spectroscopy technique. The 218At source prepared in U(p,X),E=1.4 GeV reaction using UCx target. Deduced change in rms charge radius, isotope shift, magnetic moment and quadrupole moment

No information is available from 218Po β- decay to 218At

218At α decay experimental study: 1990Mo08

Theory references: consult NSR database ( for 11 primary references for calculations of half-lives of radioactive decays, and one for nuclear structure

Q-value: S(2n)=10301 12, S(2p)=12354 16 (2017Wa10)

Jπ(level) T1/2(level)
  0 (3-,2-) 1.28 s 6 
% β- = 0.05 5
% α = 99.95 5

Back to top

Back to top

Additional Level Data and Comments:

  0(3-,2-) 1.28 s 6 
% β- = 0.05 5
% α = 99.95 5
%α=99.9 and %β-=0.1 were deduced by 1949Wa05 from α intensities of 218At and 218Rn. These results are consistent with non-observation of α decay from 218Rn (β- daughter of 218At decay) in the study of 218At α decay by 2019Cu02. Theoretical partial T1/2>100 s for 218At β decay and (2019Mo01) gives %β-<1.3.

Back to top