ADOPTED LEVELS, GAMMAS for 217Fr

Authors: S. Kumar and F.G. Kondev |  Citation: Nucl. Data Sheets 147, 382 (2018) |  Cutoff date: 1-DEC-2017 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-1575 keV 10S(n)= 6728 keV 8S(p)= 3227 keV 9Q(α)= 8469 keV 4
Reference: 2017Wa10

References:
  A  221Ac α decay  B  210Pb(11B,4nγ)

General Comments:

217Fr evaluated by F.γ. Kondev and S. Kumar

Q-value: S(2n)=12146 9; S(2p)=9008 9 (2017Wa10)










E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
     0.0AB 9/2- 22 µs 5 
% α = 100
     
   210 4 A         
   274 4 A         
   363.6 3  B 13/2-     363.6 3 
  100
E2
     0.0
9/2-
   482 8 A         
   704.2 5  B 17/2-     340.6 3 
  100
E2
   363.6
13/2-
  1077.0 6  B 21/2-     372.8 3 
  100
E2
   704.2
17/2-
  1256.2 6  B     179.1 3 
  100
D
  1077.0
21/2-
  1355.0 6  B 23/2+     278.0 3 
  100
E1
  1077.0
21/2-
  1509.7 6  B 25/2-     154.4 3 
  432.8 3 
   35 9 
  100 9 
E1
E2
  1355.0
  1077.0
23/2+
21/2-
  1688.9 6  B     334.0 3 
  432.6 3 
 
 
(E2)
E2
  1355.0
  1256.2
23/2+

  1713.7 6  B 27/2+     204.0 3 
  358.8 4 
  100 8 
   61 8 
E1
E2
  1509.7
  1355.0
25/2-
23/2+
  1988.5 6  B 29/2-     274.7 3 
  478.8 3 
  100 15 
   92 15 
[E1]
E2
  1713.7
  1509.7
27/2+
25/2-
  2111.0 7  B 31/2+     122.5 3 
  397.4 3 
   24 7 
  100 7 
[E1]
E2
  1988.5
  1713.7
29/2-
27/2+
  2154.5 7  B     465.6 3 
  100

  1688.9

  2516.4 7  B (35/2+)     405.4 3 
  100
(E2)
  2111.0
31/2+
  2582.0 8  B     427.5 3 
  100
E2
  2154.5

  2618.0 7 ? B     507.0 3 ?
  100

  2111.0
31/2+
  3002.2 8  B (39/2+)     485.8 3 
  100
E2
  2516.4
(35/2+)

E(level): From a least-squares fit to Eγ data, unless otherwise stated.

Jπ(level): From 1988Ai02 210Pb(11B,4nγ), based on deduced γ-ray transition multipolarities and the established band structures, unless otherwise stated

M(γ): From 210Pb(11B,4nγ) based on angular distributions and angular correlations data analysis, and on intensity balance consideration which allowed to differentiate between E1 from M1 alternatives. Since no delayed components were observed, M2 assignments were ruled out for quadrupole transitions. DCO ratios were obtained by gating on known stretched E2 transitions; expected values are >1 for stretched Q and <1 for stretched d.

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Band Transitions:

E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 1 - ground state band.
     0.0 9/2- 22 µs 5 
% α = 100
     
   363.6 3  13/2-        
   704.2 5  17/2-        
  1077.0 6  21/2-     372.8 3 
  100
E2
   704.2
17/2-
  1509.7 6  25/2-        
  1988.5 6  29/2-     274.7 3 
  478.8 3 
  100 15 
   92 15 
[E1]
E2
  1713.7
  1509.7
27/2+
25/2-
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 2 - positive parity band.
  1355.0 6  23/2+        
  1713.7 6  27/2+        
  2111.0 7  31/2+        
  2516.4 7  (35/2+)     405.4 3 
  100
(E2)
  2111.0
31/2+
  3002.2 8  (39/2+)        
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 3 - side band.
  1256.2 6         
  1688.9 6         
  2154.5 7         
  2582.0 8      427.5 3 
  100
E2
  2154.5

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Additional Gamma Data:













E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityConversion
Coefficient		Additional Data
   363.6 13/2-     363.6 3 E20.0832α=0.0832
   704.2 17/2-     340.6 3 E20.0999α=0.0999
  1077.0 21/2-     372.8 3 E20.0777α=0.0777
  1355.0 23/2+     278.0 3 E10.0407α=0.0407
  1509.7 25/2-     154.4 3 E10.1647α=0.1647
25/2-     432.8 3 E20.0525α=0.0525
  1688.9     432.6 3 E20.0526α=0.0526
  1713.7 27/2+     358.8 4 E20.0863α=0.0863
  1988.5 29/2-     478.8 3 E20.0409α=0.0409
  2111.0 31/2+     122.5 3 [E1]0.289α=0.289 5
31/2+     397.4 3 E20.0655α=0.0655
  2516.4 (35/2+)     405.4 3 (E2)0.0621α=0.0621
  2582.0     427.5 3 E20.0542α=0.0542
  3002.2 (39/2+)     485.8 3 E20.0395α=0.0395

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.09/2- 22 µs 5 
% α = 100
E(level): ground state band.
   210   E(level): From 221Ac α decay.
   274   E(level): From 221Ac α decay.
   363.613/2-   E(level): ground state band.
   482   E(level): From 221Ac α decay.
   704.217/2-   E(level): ground state band.
  1077.021/2-   E(level): ground state band.
  1256.2   E(level): side band.
  1355.023/2+   E(level): positive parity band.
  1509.725/2-   E(level): ground state band.
  1688.9   E(level): side band.
  1713.727/2+   E(level): positive parity band.
  1988.529/2-   E(level): ground state band.
  2111.031/2+   E(level): positive parity band.
  2154.5   E(level): side band.
  2516.4(35/2+)   E(level): positive parity band.
  2582.0   E(level): side band.
  3002.2(39/2+)   E(level): positive parity band.

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Additional Gamma Comments:

E(level)E(gamma)Comments
   363.6   363.6E(γ): γγ coin analysis in 210Pb(11B,4nγ) (1988Ai02) reveals that 363.6γ is multiplet and, therefore, the ordering of 340.6γ and 363.6γ is not unambiguous.
M(γ): DCO=1.32 11; A2=0.24 6, A4=-0.13 8
   704.2   340.6M(γ): A2=0.34 5, A4=-0.17 7; DCO=1.37 8
  1077.0   372.8M(γ): A2=0.34 5; DCO=1.28 6
  1256.2   179.1M(γ): DCO=0.85 {11
  1355.0   278.0M(γ): DCO=0.63 6, A2=-0.24 3. Total intensity for 278.0γ suggests E1 rather than M1 assignment, when considering the intensity balance at the 1077-keV level by gating on the preceding 154.4γ and 358.8γ
  1509.7   154.4I(γ): from B(E1)/B(E2)=1.1×10-6 4 (1988Ai02)
M(γ): A2=-0.28 14; DCO=0.80 {14
   432.8I(γ): from B(E1)/B(E2)=1.1×10-6 4 (1988Ai02)
M(γ): DCO=1.31 31, but it may be associated with 432.6γ, depopulating the 1688.9-keV level
  1688.9   334.0M(γ): DCO=1.59 30, but it is also in agreement with a possible ΔJ=0, J to J transition
   432.6M(γ): DCO=1.31 31, but it may be associated with 432.8γ, depopulating the 1509.7-keV level
  1713.7   204.0I(γ): from B(E1)/B(E2)=0.9×10-6 2 (1988Ai02)
M(γ): DCO=0.75 8, A2=-0.19 6. Doublet consisting of 202.3γ and 204.0γ transition, the former is E1 in 215Fr (1984Sc25).
   358.8I(γ): from B(E1)/B(E2)=0.9×10-6 2 (1988Ai02)
M(γ): DCO=1.28 23, A2=0.34 5, A4=-0.17 7
  1988.5   274.7I(γ): from B(E1)/B(E2)=1.0×10-6 3 (1988Ai02)
M(γ): DCO=0.61 8
   478.8I(γ): from B(E1)/B(E2)=1.0×10-6 3 (1988Ai02)
M(γ): DCO=1.30 11
  2111.0   122.5I(γ): from B(E1)/B(E2)=1.1×10-6 4 (1988Ai02)
M(γ): DCO=0.54 21
   397.4I(γ): from B(E1)/B(E2)=1.1×10-6 4 (1988Ai02)
M(γ): DCO=1.58 20, A2=0.37 8
  2154.5   465.6M(γ): DCO=1.58 20
  2516.4   405.4M(γ): DCO=1.14 16
  2582.0   427.5M(γ): DCO=1.46 19
  3002.2   485.8M(γ): DCO=1.46 12

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