ADOPTED LEVELS, GAMMAS for 217Po

Authors: B. Singh, T. Roy, K. Banerjee |  Citation: Nucl. Data Sheets 147, 382 (2018) |  Cutoff date: 1-DEC-2017 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=1489 keV 8S(n)= 3970 keV 7S(p)= 7279 keV 13Q(α)= 6662.1 keV 24
Reference: 2017WA10

References:
  A  217Bi β- decay (98.5 S)  B  221Rn α decay (25.7 M)

General Comments:

217Po evaluated by B. Singh, t. Roy and K. Banerjee

1956Mo15: production and identification of 217Po nuclide as daughter of 221Rn α decay

2015Fi07: measured laser resonance spectrum with laser on and off; deduced spin, isotope shifts, mean-square charge radius, magnetic dipole moment and electric quadrupole moment at ISOLDE-CERN facility. 217Po produced in 238U(p,F),E=1.4 GeV. Comparison with theoretical calculations using spherical droplet model and mean-field approach

Q-value: S(2n)=9717 7, S(2p)=13040 50 (syst, 2017Wa10)










E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
     0.0AB (9/2+) 1.53 s 5 
% α > 95
% β- < 5
     
   254.1 1 AB (7/2+)      254.1 1 
  100
(E2)
     0.0
(9/2+)
   264.68 4 AB (11/2+)      264.68 4 
  100
(M1(+E2))
     0.0
(9/2+)
   376 1 A       376
  100

     0.0
(9/2+)
   554 1 A       554
  100

     0.0
(9/2+)
   632 1 A       632
  100

     0.0
(9/2+)
   701.5 7 A       436 3 ?
   447.4 7 
  188 56 
  100 20 


   264.68
   254.1
(11/2+)
(7/2+)
   757 1 A       757
  100

     0.0
(9/2+)
   887.7 10 ?A       623?
  100

   264.68
(11/2+)
  1095.6 18 A       841.5 18 
  100

   254.1
(7/2+)
  1154.6 6 A       889.9 6 
  100

   264.68
(11/2+)
  1281.7 10 ?A      1017 1 ?
  100

   264.68
(11/2+)
  1314.6 12 ?A       160?
  100

  1154.6

  1496.0 15 ?A       739?
 

   757

E(level): From Eγ data, assuming 1 keV uncertainty for Eγ when not stated

Jπ(level): From analogy to 219Rn. See also comments for each level.

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Additional Gamma Data:















E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityMixing
Ratio		Conversion
Coefficient		Additional Data
   254.1 (7/2+)      254.1 1 (E2) 0.210α=0.210 3, α(K)=0.0975 14, α(L)=0.0841 13, α(M)=0.0220 4, α(N)=0.00565 9, α(O)=0.001096 17, α(P)=0.0001067 16
   264.68 (11/2+)      264.68 4 (M1(+E2))1.8 LT0.5α=0.5 2, α(K)=0.4 2, α(L)=0.09 1, α(M)=0.022 2, α(N)=0.0056 6, α(O)=0.00115 14

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.0(9/2+) 1.53 s 5 
% α > 95
% β- < 5
Q=+0.06 44 (2015Fi07), μ=-1.106 103 (2015Fi07)
Limit on β- decay was obtained by comparing the intensities of the α groups from 221Rn, 221Fr, 217Po, and 217At decays. Other measurement: %α>80, %β-<20 (1956Mo15). Gross β-decay calculation of 1973Ta30 gives %β-<1.
E(level): Limit on β- decay was obtained by comparing the intensities of the α groups from 221Rn, 221Fr, 217Po, and 217At decays. Other measurement: %α>80, %β-<20 (1956Mo15). Gross β-decay calculation of 1973Ta30 gives %β-<1.

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Additional Gamma Comments:

E(level)E(gamma)Comments
   264.68   264.68E(γ): from 221Rn α decay

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