ADOPTED LEVELS, GAMMAS for 211Ra

Authors: D. Abriola, P. Demetriou, M. Hassanvand, M. Hussain |  Citation: Nucl. Data Sheets 114, 661 (2013) |  Cutoff date: 28-FEB-2013 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-6370 keV 50S(n)= 7700 keV 17S(p)= 3124 keV 17Q(α)= 7042 keV 3
Reference: 2012WA38

References:
  A  211Ra IT decay  B  215Th α decay

General Comments:

211Ra evaluated by d. Abriola, p. Demetriou, M. Hassanvand, M. Hussain

Q-value: S(2n)=17160 50, S(2p)=4817 22, Q(εp)=3148 9 (2012Wa38)










E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
     0.0AB 5/2(-) 13 s 2 
% α > 93
% ε < 7
     
   133.86 10  B (1/2-)     133.88 10 
  100
E2
     0.0
5/2(-)
   194.54 13  B (3/2-)      60.9 3 
  194.49 14 
   11 3 
  100 14 
(M1,E2)
M1
   133.86
     0.0
(1/2-)
5/2(-)
   295.1 3  B (3/2-)     295.1 3 
  100
(M1)
     0.0
5/2(-)
   802.0 6 A  (9/2-)     802.0 6 
  100
(E2)
     0.0
5/2(-)
  1198.1 8 A  (13/2+) 9.7 µs 6    396.1 6 
  100
M2
   802.0
(9/2-)

E(level): From least squares fit to Eγ values.

E(γ): From weighted average of values from 2005Ku31 and 2000He17, unless otherwise stated

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Additional Gamma Data:













E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityConversion
Coefficient		Additional Data
   133.86 (1/2-)     133.88 10 E22.78α=2.78, α(K)=0.296 5, α(L)=1.82 3, α(M)=0.496 8, α(N)=0.1310 19, α(O)=0.0279 4, α(P)=0.00407 6, α(Q)=2.20×10-5 4
   194.54 (3/2-)      60.9 3 (M1,E2)57α=57 44, α(L)=47 37, α(M)=11 9, α(N)=3.0 24, α(O)=0.6 5, α(P)=0.09 7, α(Q)=0.0012 8, α(N+)=4 3
(3/2-)     194.49 14 M12.37α=2.37, α(K)=1.90 3, α(L)=0.352 5, α(M)=0.0840 12, α(N)=0.0222 4, α(O)=0.00506 8, α(P)=0.000881 13, α(Q)=6.91×10-5 10
   295.1 (3/2-)     295.1 3 (M1)0.742α=0.742, α(K)=0.597 9, α(L)=0.1096 16, α(M)=0.0262 4, α(N)=0.00690 10, α(O)=0.001574 23, α(P)=0.000275 4, α(Q)=2.15×10-5 3
   802.0 (9/2-)     802.0 6 (E2)0.01387α=0.01387 20, α(K)=0.01037 15, α(L)=0.00263 4, α(M)=0.000653 10, α(N)=0.0001721 25, α(O)=3.84×10-5 6, α(P)=6.37E-5 6, α(Q)=3.59E-7 5
  1198.1 (13/2+) 9.7 µs 6    396.1 6 M21.014B(M2)(W.u.)=0.0046 3, α=1.014 15, α(K)=0.759 12, α(L)=0.192 3, α(M)=0.0479 8, α(N)=0.01275 19, α(O)=0.00290 5, α(P)=0.000499 8, α(Q)=3.6×10-5 6

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.05/2(-) 13 s 2 
% α > 93
% ε < 7
Q=+0.46 5 (2011StZZ), μ=+0.8780 38 (2011StZZ)
%α and %ε; from general assumption of log ft>5.9 for forbidden ε decay to the 211Fr 9/2- ground state. More specifically, from systematics (1998Si17) for a ΔJ=2 forbidden transition most likely log ft>7.5 leading to even lower %ε.
E(level): %α and %ε; from general assumption of log ft>5.9 for forbidden ε decay to the 211Fr 9/2- ground state. More specifically, from systematics (1998Si17) for a ΔJ=2 forbidden transition most likely log ft>7.5 leading to even lower %ε.

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Additional Gamma Comments:

E(level)E(gamma)Comments
   133.86   133.88M(γ): from comparison of α(exp) and α(E2,theory)=2.78
   194.54    60.9M(γ): from spin assignments of initial and final levels of γ ray.
   194.49M(γ): from comparison of α(exp) and α(M1,theory)=2.37
   295.1   295.1M(γ): from comparison of α(exp) with α(M1,theory)=0.742 and α(E3,theory)=1.1, M1 and E3 are possible; Weisskopf half-life estimates for M1 T1/2=8.57×10+-7 μs 7 and E3 T1/2=2.36 ms 4 rule out E3 since γ ray is observed to be prompt according to 2005Ku31.
   802.0   802.0M(γ): from spins of initial and final states.
  1198.1   396.1M(γ): From comparison of α(exp) and αk/α with α(M2,theory)=1.014 and α(E4,theory)=1.387 M2 and E4 are possible; Weisskopf estimates for M2 T1/2=0.09 μs 15 and E4 T1/2=172 s 5 compared with measured T1/2=4.0 μs 5 rule out E4.

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