ADOPTED LEVELS, GAMMAS for 237Pu

Author: M. S. Basunia |  Citation: Nucl. Data Sheets 107, 2323 (2006) |  Cutoff date: 15-Mar-2006 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-1.48×103 keV SYS(n)= 5880.7 keV 21S(p)= 5.57×103 keV 5Q(α)= 5748.3 keV 23
Reference: 2012WA38

References:
  A  241Cm α decay  B  237Am ε decay
  C  238Pu(d,t)  D  239Pu(p,t)
  E  237Pu IT decay (0.18 S) 

General Comments:

Calculation of energies and wavefunctions for nonrotational states was reported in 1971Ko31 and 1982Li02.

Levels: The configurations given below are the dominant components.

Q-value: Note: Current evaluation has used the following Q record

Q-value: ΔQ(β-)=60(syst) 2003Au03










E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
     0.0ABC E 7/2- 45.64 d 4 
% ε = 99.9958 4
% α = 0.0042 4
     
    47.71 4 ABC   9/2-       47.71 4 
  100
M1+E2
     0.0
7/2-
   106 5 A C   11/2-        
   145.543 8 ABCDE 1/2+ 0.18 s 2 
% IT = 100
   145.542 8 
  100
E3
     0.0
7/2-
   155.456 12 ABC   3/2+        9.903 16 
  100
M1+E2
   145.543
1/2+
   175 7 A C   13/2-        
   201.179 12 ABCD  5/2+       45.724 8 
    55.638 11 
   46 12 
  100 16 
M1+E2
(E2)
   155.456
   145.543
3/2+
1/2+
   224.25 5 ABCD  7/2+       68.8 1 
  100
(E2)
   155.456
3/2+
   257  C   15/2-        
   280.222 14  BC   5/2+       79.05 2 
   124.72 3 
   280.23 2 
    0.42 7 
    0.59 11 
  100 5 
(M1)
(M1)
E1
   201.179
   155.456
     0.0
5/2+
3/2+
7/2-
   304 4 A CD  9/2+        
   320.970 16  B    7/2+       40.748 6 
   273.3 1 
   321.0 1 
    2.0 4 
   54 4 
  100 8 
M1+E2

E1
   280.222
    47.71
     0.0
5/2+
9/2-
7/2-
   370.40 4 AB    3/2+      214.9 2 
   224.86 4 
  100 21 
  100 21 
(M1)
(M1)
   155.456
   145.543
3/2+
1/2+
   371 5   C   9/2+        
   404.19 5 ABC   5/2+      123.8 3 
   179.94 2 
   203.03 5 
   248.7 2 
   ≈7
   41 9 
   71 9 
  100 10 

(M1(+E2))
M1(+E2)
(M1(+E2))
   280.222
   224.25
   201.179
   155.456
5/2+
7/2+
5/2+
3/2+
   407.82 6  BCD  5/2+      127.5 2 
   183.7 2 
   206.7 1 
   252.2 2 
   407.8 1 
   17 4 
   30 8 
   52 7 
   43 12 
  100 8 

M1(+E2)
M1(+E2)
M1(+E2)
(E1)
   280.222
   224.25
   201.179
   155.456
     0.0
5/2+
7/2+
5/2+
3/2+
7/2-
E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
   438.41 7  BC   7/2+      158.3 3 
   390.7 1 
   438.4 1 
    0.8 3 
    6.6 5 
  100 5 

E1
E1
   280.222
    47.71
     0.0
5/2+
9/2-
7/2-
   453.29 14  BC   7/2+      229.1 3 
   252.2 2 
   453.2 3 
  100 34 
  100 34 
   67 14 



   224.25
   201.179
     0.0
7/2+
5/2+
7/2-
   473.52 7  BC   7/2+      193.4 3 
   425.8 1 
   473.5 1 
    2.1 7 
   45 3 
  100 7 

E1
E1
   280.222
    47.71
     0.0
5/2+
9/2-
7/2-
   486  C   (9/2+)        
   513  C   9/2+        
   545  C   (1/2-)        
   582  C   (5/2-)        
   591  C   (3/2-)        
   655  C          
   655.39 15  BC   (5/2)-      655.3 2 
  100
M1
     0.0
7/2-
   691  C   (7/2-)        
   696.14 15  B    7/2-       40.748 6 
   648.5 3 
   696.2 3 
 
  100 16 
   77 16 

M1
M1
   655.39
    47.71
     0.0
(5/2)-
9/2-
7/2-
   716  C          
   741  C          
   757  C          
   775  C          
   800 2    D  1/2+        
   809  C          
   840  C          
   851 5    D  3/2+,5/2+        
   852  C          
   884  C          
E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
   908.90 12  B    7/2+      435.2 3 
   455.8 3 
   501.2 3 
   504.8 3 
   861.2 3 
   908.8 2 
    9.6 16 
    3.5 8 
   10.8 16 
    7.3 16 
   14.2 16 
  100 6 
M1
M1
M1
M1


   473.52
   453.29
   407.82
   404.19
    47.71
     0.0
7/2+
7/2+
5/2+
5/2+
9/2-
7/2-
   933  C          
   964  C          
   998 5   CD         
  1000.6 3  BC   3/2+,5/2,7/2      720.4 5 
  1000.6 3 
  100 21 
   79 21 


   280.222
     0.0
5/2+
7/2-
  1014  C          
  1025 3    D         
  1053  C          
  1104  C          
  1189  C          
  1216  C          
  1250  C          
  1264  C          
  1348  C          
  1383  C          
  1397  C          
  1463  C          
  1481  C          
  1534  C          
    26.0E+2 20       97 ns 4 
% SF > 0
     
    29.0E+2 25       1.1 µs 1 
% SF > 0
     

E(level): From a least squares fit to the adopted γ-ray energies.

Jπ(level): Assignments are based on the measured absolute cross sections in (d,t) data, expected pattern of the rotational bands, and deduced L transfer values.

E(γ): Except for 145.544γ, all energies are from 237Am ε decay.

I(γ): From 237Am ε decay.

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Band Transitions:

E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 1 - 7/2[743] band.
     0.0 7/2- 45.64 d 4 
% ε = 99.9958 4
% α = 0.0042 4
     
    47.71 4  9/2-       47.71 4 
  100
M1+E2
     0.0
7/2-
   106 5  11/2-        
   175 7  13/2-     
   257 15/2-     
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 2 - 1/2[631] band.
   145.543 8  1/2+ 0.18 s 2 
% IT = 100
     
   155.456 12  3/2+        9.903 16 
  100
M1+E2
   145.543
1/2+
   201.179 12  5/2+        
   224.25 5  7/2+       68.8 1 
  100
(E2)
   155.456
3/2+
   304 4  9/2+     
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 3 - 5/2[622] band.
   280.222 14  5/2+        
   320.970 16  7/2+       40.748 6 
   273.3 1 
   321.0 1 
    2.0 4 
   54 4 
  100 8 
M1+E2

E1
   280.222
    47.71
     0.0
5/2+
9/2-
7/2-
   371 5  9/2+        
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 4 - 3/2[631] band.
   370.40 4  3/2+        
   404.19 5  5/2+      123.8 3 
   179.94 2 
   203.03 5 
   248.7 2 
   ≈7
   41 9 
   71 9 
  100 10 

(M1(+E2))
M1(+E2)
(M1(+E2))
   280.222
   224.25
   201.179
   155.456
5/2+
7/2+
5/2+
3/2+
   453.29 14  7/2+        
   513 9/2+     
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 5 - 5/2[633] band.
   407.82 6  5/2+        
   438.41 7  7/2+      158.3 3 
   390.7 1 
   438.4 1 
    0.8 3 
    6.6 5 
  100 5 

E1
E1
   280.222
    47.71
     0.0
5/2+
9/2-
7/2-
   486 (9/2+)        
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 6 - 7/2[624] band.
   473.52 7  7/2+        
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 7 - 1/2[501] band.
   545 (1/2-)        
   582 (5/2-)     
   591 (3/2-)        
   691 (7/2-)     
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 8 - K=5/2 band.
   655.39 15  (5/2)-        
   696.14 15  7/2-       40.748 6 
   648.5 3 
   696.2 3 
 
  100 16 
   77 16 

M1
M1
   655.39
    47.71
     0.0
(5/2)-
9/2-
7/2-
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 9 - K=1/2 : 0+ PHONON COUPLED TO 1/2[631] STATE.
   800 2  1/2+        

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Additional Gamma Data:















E(level)
(keV)
Jπ(level)T1/2(level)E(γ)
(keV)
MultipolarityMixing
Ratio
Conversion
Coefficient
Additional Data
    47.71 9/2-       47.71 4 M1+E20.24 879α=79 15
   145.543 1/2+ 0.18 s 2 
% IT = 100
   145.542 8 E3 51.6B(E3)=0.028 4, B(E3)(W.u.)=0.028 4, α=51.6
   155.456 3/2+        9.903 16 M1+E20.07 23.2×103α=3.2×103 10
   201.179 5/2+       45.724 8 M1+E20.47 13170α=170 60
5/2+       55.638 11 (E2) 261α=261
   224.25 7/2+       68.8 1 (E2) 94.2α=94.2
   280.222 5/2+       79.05 2 (M1) 12.0α=12.0
5/2+      124.72 3 (M1) 15.1α=15.1
5/2+      280.23 2 E1 0.0484α=0.0484
   320.970 7/2+       40.748 6 M1+E20.19 3123α=123 14
7/2+      321.0 1 E1 0.036α=0.036
   370.40 3/2+      214.9 2 (M1) 3.23α=3.23
3/2+      224.86 4 (M1) 2.85α=2.85
   404.19 5/2+      179.94 2 (M1(+E2))0.7 74.0α=4.0 14
5/2+      203.03 5 M1(+E2)0.4 43.4α=3.4 5
5/2+      248.7 2 (M1(+E2))0.6 61.7α=1.7 5
   407.82 5/2+      183.7 2 M1(+E2)0.7 73.8α=3.8 13
5/2+      206.7 1 M1(+E2)0.3 33.4α=3.4 2
5/2+      252.2 2 M1(+E2)0.6 61.6α=1.6 5
5/2+      407.8 1 (E1) 0.0218α=0.0218
   438.41 7/2+      390.7 1 E1 0.0238α=0.0238
7/2+      438.4 1 E1 0.0188α=0.0188
   473.52 7/2+      425.8 1 E1 0.0200α=0.0200
7/2+      473.5 1 E1 0.0161α=0.0161
   655.39 (5/2)-      655.3 2 M1 0.153α=0.153
E(level)
(keV)
Jπ(level)T1/2(level)E(γ)
(keV)
MultipolarityMixing
Ratio
Conversion
Coefficient
Additional Data
   696.14 7/2-      648.5 3 M1 0.158α=0.158
7/2-      696.2 3 M1 0.131α=0.131
   908.90 7/2+      435.2 3 M1 0.462α=0.462
7/2+      455.8 3 M1 0.407α=0.407
7/2+      501.2 3 M1 0.315α=0.315
7/2+      504.8 3 M1 0.309α=0.309

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.07/2- 45.64 d 4 
% ε = 99.9958 4
% α = 0.0042 4
α branching was calculated from γ intensities measured in α and ε decays of 237Pu (1979El05) (see 237Pu α decay). %α=0.0033 3 was calculated from α activities of 237Pu, 236Pu in a source with known fractions, and K x-ray counting (1957Th10). Other: a%=0.0020 4 in 1957Ho68.
E(level): α branching was calculated from γ intensities measured in α and ε decays of 237Pu (1979El05) (see 237Pu α decay). %α=0.0033 3 was calculated from α activities of 237Pu, 236Pu in a source with known fractions, and K x-ray counting (1957Th10). Other: a%=0.0020 4 in 1957Ho68. 7/2[743] band.
    47.719/2-   E(level): 7/2[743] band.
   10611/2-   E(level): 7/2[743] band.
   145.5431/2+ 0.18 s 2 
% IT = 100
E(level): 1/2[631] band.
   155.4563/2+   E(level): 1/2[631] band.
   17513/2-   E(level): 7/2[743] band.
   201.1795/2+   E(level): 1/2[631] band.
   224.257/2+   E(level): 1/2[631] band.
   25715/2-   E(level): 7/2[743] band.
   280.2225/2+   E(level): 5/2[622] band.
   3049/2+   E(level): 1/2[631] band.
   320.9707/2+   E(level): 5/2[622] band.
   370.403/2+   E(level): 3/2[631] band.
   3719/2+   E(level): 5/2[622] band.
   404.195/2+   E(level): 3/2[631] band.
   407.825/2+   E(level): 5/2[633] band.
   438.417/2+   E(level): 5/2[633] band.
   453.297/2+   E(level): 3/2[631] band.
   473.527/2+   E(level): 7/2[624] band.
   486(9/2+)   E(level): 5/2[633] band.
   5139/2+   E(level): 3/2[631] band.
   545(1/2-)   E(level): 1/2[501] band.
Jπ(level): From (d,t) data.
   582(5/2-)   Spin assignment is tentative.
E(level): Spin assignment is tentative. 1/2[501] band.
Jπ(level): From (d,t) data.
   591(3/2-)   E(level): 1/2[501] band.
Jπ(level): From (d,t) data.
   655   This level, observed in (d,t) reaction, may be identical to the 655.3-keV, 5/2-, K=5/2 level observed in 237Am ε decay. See the comment on Nilsson assignment for the band based on 655.3-keV level.
E(level): This level, observed in (d,t) reaction, may be identical to the 655.3-keV, 5/2-, K=5/2 level observed in 237Am ε decay. See the comment on Nilsson assignment for the band based on 655.3-keV level.
E(level)Jπ(level)T1/2(level)Comments
   655.39(5/2)-   E(level): K=5/2 band.
   691(7/2-)   E(level): 1/2[501] band.
Jπ(level): From (d,t) data.
   696.147/2-   E(level): K=5/2 band.
   8001/2+   E(level): K=1/2 : 0+ PHONON COUPLED TO 1/2[631] STATE.
   852   5/2-, 5/2[503] state assignment was tentatively proposed in (d,t) dataset (1973Gr26).
E(level): 5/2-, 5/2[503] state assignment was tentatively proposed in (d,t) dataset (1973Gr26).
  1014   3/2-, 3/2[501] state assignment was tentatively proposed in 1973Gr26 from (d,t) data.
E(level): 3/2-, 3/2[501] state assignment was tentatively proposed in 1973Gr26 from (d,t) data.
    26.0E+2 97 ns 4 
% SF > 0
SF decay observed. Other decay mode not reported.
E(level): SF decay observed. Other decay mode not reported.
    29.0E+2 1.1 µs 1 
% SF > 0
Only SF decay has been observed, it is not established whether the level decays by γ to the 85Ns SF isomer or by SF only, or both.
E(level): Only SF decay has been observed, it is not established whether the level decays by γ to the 85Ns SF isomer or by SF only, or both.

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Additional Gamma Comments:

E(level)E(gamma)Comments
   145.543   145.542E(γ): weighted average of 145.536 9 (241Cm α decay) and 145.552 12 (237Am ε decay). The unweighted average is 145.544 8.
   320.970    40.748E(γ): Multiply placed with undivided intensity
I(γ): Multiply placed with undivided intensity
   407.82   252.2E(γ): Multiply placed with intensity suitably divided
I(γ): Multiply placed with intensity suitably divided
   453.29   252.2E(γ): Multiply placed with intensity suitably divided
I(γ): Multiply placed with intensity suitably divided
   696.14    40.748E(γ): Multiply placed with undivided intensity
I(γ): Multiply placed with undivided intensity

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