ADOPTED LEVELS, GAMMAS for 248Cm

Author: C.D. Nesaraja |  Citation: Nucl. Data Sheets 204, 374 (2025) |  Cutoff date: 30-Jun-2024 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-740 keV 50S(n)= 6212 keV 4S(p)= 7050 keV SYQ(α)= 5161.81 keV 25
Reference: 2021WA16

References:
  A  248Bk ε decay  B  252Cf α decay
  C  246Cm(t,p)  D  248Cm(α,α’),(d,d’)
  E  248Cm(209Bi,209Bi’γ)  F  Coulomb Excitation








E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
     0.0ABCDEF 0+ 3.48×10+5 y 6 
% α = 91.61 16
% SF = 8.39 16
     
    43.399 25 ABCDEF 2+ 122.5 ps 25      43.399 25 
   100
E2
     0.0
0+
   143.80 20  B DEF 4+ 80 ps +14-19     100.4 2 
   100
E2
    43.399
2+
   298.90 29  B DEF 6+ 34 ps +11-3     155.1 2 
   100
E2
   143.80
4+
   506.5 6  B DEF 8+ 16.0 ps +31-23     207.4 2 S
   100
E2
   298.90
6+
   762.9 6      F 10+ 7.5 ps +7-6     256.4 2 
   100
E2
   506.5
8+
  1050 2    D F (2+) 1.23 ps +18-16       
  1050 2    D F (1-)        
  1064.2 7      F 12+ 3.71 ps +22-18     301.3 2 
   100
E2
   762.9
10+
  1084  C  F 0+        
  1095 2    D F 3-        
  1131 3    D F 2+        
  1144 2    D F (4+)        
  1172 3    D F (5-)        
  1222 3    D F 4+        
  1236 2    D   (3-)        
  1284.4 7     EF 6+      985
 

   298.90
6+
  1295.2 6      F 7-      789.0 5 
   996.4 5 
  ≤100
    ≤8.2


   506.5
   298.90
8+
6+
  1305 3    D   (3-)        
  1319 3    D          
  1358 3    D          
  1399 3    D          
  1406.2 7      F 14+ 1.75 ps +9-7     342.0 2 
   100
E2
  1064.2
12+
  1440 3    D          
  1452.4 7     EF 8+      167.9 5 
   946.1 5 
  ≤152
     1E2 1 


  1284.4
   506.5
6+
8+
  1460.5 12     E  (8-) 146 µs 18 
% IT = 100
     7S
   954
 
 


  1452.4
   506.5
8+
8+
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
  1466.0 6      F 9-      171.2 5 
   703.1 4 
   959.0 5 
    49 41 
   100 20 
     5 5 



  1295.2
   762.9
   506.5
7-
10+
8+
  1466.2 5      F 8+     1167.3 4 
   100

   298.90
6+
  1469 4    D          
  1484 2    D   (3-)        
  1514 3    D          
  1552 4    D          
  1651 4    D          
  1651.9 7      F 10+      185.9 4 
  1145.4 4 
   100 73 
    25 20 


  1466.0
   506.5
9-
8+
  1669.4 7      F 10+      217.1 5 
   906.6 4 
   <80
   100 43 


  1452.4
   762.9
8+
10+
  1682.5 7      F 11-      216.4 4 
   618.3 3 
   919.6 4 
    23 11 
   100 14 
     7 7 



  1466.0
  1064.2
   762.9
9-
12+
10+
  1784.1 7      F 16+ 1.43 ps +9-11     377.8 2 
   100
E2
  1406.2
14+
  1880.2 7      F 12+      228.4 4 
  1117.4 5 
   100 67 
     7 5 


  1651.9
   762.9
10+
10+
  1883 3    D          
  1929.1 7      F 12+      259.9 4 
   865.2 4 
    59 23 
   100 26 


  1669.4
  1064.2
10+
12+
  1938 4    D          
  1942.1 7      F 13-      259.6 3 
   535.9 3 
   877.9 4 
    49 9 
   100 14 
     9 5 



  1682.5
  1406.2
  1064.2
11-
14+
12+
  1969 4    D          
  2000 4    D          
  2150.1 7      F 14+      270.0 5 
  1085.5 5 
     1E2 1 
   <11


  1880.2
  1064.2
12+
12+
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
  2192.7 7      F 18+ 0.87 ps +9-7     408.6 2 
   100
E2
  1784.1
16+
  2229.5 7      F 14+      300.8 4 
   822.9 4 
   100 67 
    87 27 


  1929.1
  1406.2
12+
14+
  2242.1 7      F 15-      300.0 3 
   458.1 3 
   835.9 4 
   100 57 
    83 37 
     8.0 23 



  1942.1
  1784.1
  1406.2
13-
16+
14+
  2460.6 8      F 16+      310.2 5 
  1054.7 5 
  <100
    <7.4


  2150.1
  1406.2
14+
14+
  2566.9 7      F 16+      337.4 3 
   782.7 4 
   100 60 
    36 19 


  2229.5
  1784.1
14+
16+
  2578.3 7      F 17-      336.2 3 
   385.7 3 
   794.3 4 
   100 15 
    24.0 21 
     6.9 21 



  2242.1
  2192.7
  1784.1
15-
18+
16+
  2627.2 7      F 20+ 0.76 ps +11-8     434.4 2 
   100
E2
  2192.7
18+
  2808.6 9      F 18+      348.0 5 
   100

  2460.6
16+
  2937.2 7      F 18+      370.3 3 
   744.6 4 
   100 58 
    33 16 


  2566.9
  2192.7
16+
18+
  2947.2 7      F 19-      320.1 5 
   369.4 4 
   754.0 5 
     8.5 22 
   100 9 
     6.5 26 



  2627.2
  2578.3
  2192.7
20+
17-
18+
  3083.6 8      F 22+ 0.44 ps 4     456.4 2 
   100
E2
  2627.2
20+
  3190.1 10      F 20+      381.5 5 
   100

  2808.6
18+
  3331.7 8      F 20+      394.6 4 
   704.5 5 
   100 64 
   ≤17


  2937.2
  2627.2
18+
20+
  3347.0 8      F 21-      263.5 5 ?
   400.0 4 
   719.6 5 ?
   ≤11
   100 11 
    ≤9.8



  3083.6
  2947.2
  2627.2
22+
19-
20+
  3559.7 8      F 24+ 0.41 ps +9-6     476.1 2 
   100
E2
  3083.6
22+
  3601.9 12      F 22+      411.8 5 
   100

  3190.1
20+
  3738.3 9      F 22+      406.6 4 
   100

  3331.7
20+
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
  3775.0 9      F 23-      428.0 4 
   100

  3347.0
21-
  4041.0 13      F 24+      439.1 5 
   100

  3601.9
22+
  4055.5 8      F 26+ 0.32 ps +9-6     495.8 3 
   100
E2
  3559.7
24+
  4158.1 10      F 24+      419.8 5 
   100

  3738.3
22+
  4229.4 10      F 25-      454.4 4 
   100

  3775.0
23-
  4572.5 9      F 28+ 0.27 ps +18-9     517.0 4 
   100
E2
  4055.5
26+
  4599.5 11      F 26+      441.4 5 
   100

  4158.1
24+
  4709.3 11      F 27-      479.9 5 
   100

  4229.4
25-
  5114.1 11      F 30+      541.6 5 
   100

  4572.5
28+
  5215.9 12      F 29-      506.6 5 
   100

  4709.3
27-
  5680.8 12 ?     F (32+)      566.7 5 ?
   100

  5114.1
30+

E(level): From least-squares fit to Eγ data by the evaluator, except as noted

Jπ(level): From assignments to bands. Confirming arguments are given where available

T1/2(level): From Coulomb excitation, except as noted

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Band Transitions:

E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 1 - Kπ=0+ g.s. band
     0.0 0+ 3.48×10+5 y 6 
% α = 91.61 16
% SF = 8.39 16
     
    43.399 25  2+ 122.5 ps 25      43.399 25 
   100
E2
     0.0
0+
   143.80 20  4+ 80 ps +14-19     100.4 2 
   100
E2
    43.399
2+
   298.90 29  6+ 34 ps +11-3     155.1 2 
   100
E2
   143.80
4+
   506.5 6  8+ 16.0 ps +31-23     207.4 2 S
   100
E2
   298.90
6+
   762.9 6  10+ 7.5 ps +7-6     256.4 2 
   100
E2
   506.5
8+
  1064.2 7  12+ 3.71 ps +22-18       
  1406.2 7  14+ 1.75 ps +9-7       
  1784.1 7  16+ 1.43 ps +9-11     377.8 2 
   100
E2
  1406.2
14+
  2192.7 7  18+ 0.87 ps +9-7       
  2627.2 7  20+ 0.76 ps +11-8       
  3083.6 8  22+ 0.44 ps 4       
  3559.7 8  24+ 0.41 ps +9-6       
  4055.5 8  26+ 0.32 ps +9-6       
  4572.5 9  28+ 0.27 ps +18-9       
  5114.1 11  30+        
  5680.8 12  (32+)      566.7 5 ?
   100

  5114.1
30+
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 2 - Kπ=1- octupole-vibrational band
  1050 2  (1-)        
  1095 2  3-     
  1172 3  (5-)     
  1295.2 6  7-      789.0 5 
   996.4 5 
  ≤100
    ≤8.2


   506.5
   298.90
8+
6+
  1466.0 6  9-      171.2 5 
   703.1 4 
   959.0 5 
    49 41 
   100 20 
     5 5 



  1295.2
   762.9
   506.5
7-
10+
8+
  1682.5 7  11-      216.4 4 
   618.3 3 
   919.6 4 
    23 11 
   100 14 
     7 7 



  1466.0
  1064.2
   762.9
9-
12+
10+
  1942.1 7  13-        
  2242.1 7  15-        
  2578.3 7  17-      336.2 3 
   385.7 3 
   794.3 4 
   100 15 
    24.0 21 
     6.9 21 



  2242.1
  2192.7
  1784.1
15-
18+
16+
  2947.2 7  19-        
  3347.0 8  21-        
  3775.0 9  23-        
  4229.4 10  25-        
  4709.3 11  27-        
  5215.9 12  29-        
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 3 - Kπ=2+ gamma-vibrational band
  1050 2  (2+) 1.23 ps +18-16       
  1144 2  (4+)     
  1284.4 7  6+      985
 

   298.90
6+
  1452.4 7  8+      167.9 5 
   946.1 5 
  ≤152
     1E2 1 


  1284.4
   506.5
6+
8+
  1669.4 7  10+      217.1 5 
   906.6 4 
   <80
   100 43 


  1452.4
   762.9
8+
10+
  1929.1 7  12+      259.9 4 
   865.2 4 
    59 23 
   100 26 


  1669.4
  1064.2
10+
12+
  2229.5 7  14+        
  2566.9 7  16+        
  2937.2 7  18+      370.3 3 
   744.6 4 
   100 58 
    33 16 


  2566.9
  2192.7
16+
18+
  3331.7 8  20+        
  3738.3 9  22+        
  4158.1 10  24+        
  4599.5 11  26+        
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 4 - Kπ=0+
  1084 0+        
  1131 3  2+     
  1222 3  4+     
  1466.2 5  8+     1167.3 4 
   100

   298.90
6+
  1651.9 7  10+      185.9 4 
  1145.4 4 
   100 73 
    25 20 


  1466.0
   506.5
9-
8+
  1880.2 7  12+      228.4 4 
  1117.4 5 
   100 67 
     7 5 


  1651.9
   762.9
10+
10+
  2150.1 7  14+        
  2460.6 8  16+        
  2808.6 9  18+      348.0 5 
   100

  2460.6
16+
  3190.1 10  20+        
  3601.9 12  22+        
  4041.0 13  24+        

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Additional Gamma Data:













E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityConversion
Coefficient		Additional Data
    43.399 2+ 122.5 ps 25      43.399 25 E21000B(E2)(W.u.)=324 8, α=1000 14, α(L)=724 10, α(M)=203.9 29, α(N)=56.7 8, α(O)=13.70 20, α(P)=2.238 32, α(Q)=0.00553 8
   143.80 4+ 80 ps +14-19     100.4 2 E218.38B(E2)(W.u.)=3.9E2 +11-6, α=18.38 31, α(L)=13.28 22, α(M)=3.75 6, α(N)=1.045 18, α(O)=0.253 4, α(P)=0.0420 7, α(Q)=0.0001737 28
   298.90 6+ 34 ps +11-3     155.1 2 E22.71B(E2)(W.u.)=5.4E2 +6-9, α=2.71 4, α(K)=0.1741 24, α(L)=1.837 28, α(M)=0.517 8, α(N)=0.1440 22, α(O)=0.0350 5, α(P)=0.00589 9, α(Q)=3.82E-5 6
   506.5 8+ 16.0 ps +31-23     207.4 2 E20.858B(E2)(W.u.)=5.4E2 9, α=0.858 12, α(K)=0.1394 20, α(L)=0.521 8, α(M)=0.1458 21, α(N)=0.0405 6, α(O)=0.00987 14, α(P)=0.001683 25, α(Q)=1.604E-5 23
   762.9 10+ 7.5 ps +7-6     256.4 2 E20.401B(E2)(W.u.)=524 47, α=0.401 6, α(K)=0.1027 14, α(L)=0.2165 31, α(M)=0.0602 9, α(N)=0.01673 24, α(O)=0.00408 6, α(P)=0.000704 10, α(Q)=9.06E-6 13
  1064.2 12+ 3.71 ps +22-18     301.3 2 E20.2362B(E2)(W.u.)=537 +28-31, α=0.2362 33, α(K)=0.0790 11, α(L)=0.1143 16, α(M)=0.0316 4, α(N)=0.00876 12, α(O)=0.002144 31, α(P)=0.000373 5, α(Q)=6.04E-6 9
  1406.2 14+ 1.75 ps +9-7     342.0 2 E20.1608B(E2)(W.u.)=643 +27-31, α=0.1608 23, α(K)=0.0638 9, α(L)=0.0707 10, α(M)=0.01938 27, α(N)=0.00538 8, α(O)=0.001318 19, α(P)=0.0002315 33, α(Q)=4.46E-6 6
  1784.1 16+ 1.43 ps +9-11     377.8 2 E20.1210B(E2)(W.u.)=496 +41-30, α=0.1210 17, α(K)=0.0538 8, α(L)=0.0491 7, α(M)=0.01338 19, α(N)=0.00371 5, α(O)=0.000911 13, α(P)=0.0001612 23, α(Q)=3.54E-6 5
  2192.7 18+ 0.87 ps +9-7     408.6 2 E20.0978B(E2)(W.u.)=5.6E2 5, α=0.0978 14, α(K)=0.0470 7, α(L)=0.0372 5, α(M)=0.01008 14, α(N)=0.00279 4, α(O)=0.000687 10, α(P)=0.0001223 17, α(Q)=2.97E-6 4
  2627.2 20+ 0.76 ps +11-8     434.4 2 E20.0834B(E2)(W.u.)=4.8E2 6, α=0.0834 12, α(K)=0.0422 6, α(L)=0.0301 4, α(M)=0.00812 11, α(N)=0.002251 32, α(O)=0.000554 8, α(P)=9.91E-5 14, α(Q)=2.59E-6 4
  3083.6 22+ 0.44 ps 4     456.4 2 E20.0735B(E2)(W.u.)=6.5E2 +7-6, α=0.0735 10, α(K)=0.0388 5, α(L)=0.0255 4, α(M)=0.00685 10, α(N)=0.001897 27, α(O)=0.000468 7, α(P)=8.40E-5 12, α(Q)=2.325E-6 33
  3559.7 24+ 0.41 ps +9-6     476.1 2 E20.0662B(E2)(W.u.)=5.7E2 +10-11, α=0.0662 9, α(K)=0.0361 5, α(L)=0.02213 31, α(M)=0.00594 8, α(N)=0.001643 23, α(O)=0.000406 6, α(P)=7.30E-5 10, α(Q)=2.122E-6 30
  4055.5 26+ 0.32 ps +9-6     495.8 3 E20.0601B(E2)(W.u.)=6.0E2 +14-13, α=0.0601 8, α(K)=0.0336 5, α(L)=0.01939 27, α(M)=0.00518 7, α(N)=0.001435 20, α(O)=0.000355 5, α(P)=6.40E-5 9, α(Q)=1.947E-6 27
  4572.5 28+ 0.27 ps +18-9     517.0 4 E20.0544B(E2)(W.u.)=5.8E2 +29-23, α=0.0544 8, α(K)=0.0313 4, α(L)=0.01695 24, α(M)=0.00452 6, α(N)=0.001250 18, α(O)=0.000309 4, α(P)=5.60E-5 8, α(Q)=1.782E-6 25

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.00+ 3.48×10+5 y 6 
% α = 91.61 16
% SF = 8.39 16
T1/2(SF)=4.15×106 3 recommended by 2000Ho27 from weighted average of 4.22 ×106 y 12 (1969Me01), 4.20 ×106 y 5 (1971Ma32), and 4.115 ×106 y 34 (1971Mc19).
E(level): Kπ=0+ g.s. band.
    43.3992+ 122.5 ps 25  E(level): Kπ=0+ g.s. band.
   143.804+ 80 ps +14-19  E(level): Kπ=0+ g.s. band.
   298.906+ 34 ps +11-3  E(level): Kπ=0+ g.s. band.
   506.58+ 16.0 ps +31-23  E(level): Kπ=0+ g.s. band.
   762.910+ 7.5 ps +7-6  E(level): Kπ=0+ g.s. band.
  1050(2+) 1.23 ps +18-16  E(level): Kπ=2+ gamma-vibrational band.
  1050(1-)   XREF: d(1050?).
E(level): Kπ=1- octupole-vibrational band.
  1064.212+ 3.71 ps +22-18  E(level): Kπ=0+ g.s. band.
  10953-   E(level): Kπ=1- octupole-vibrational band. From 248Cm(α,α’),(d,d’).
  1144(4+)   E(level): Kπ=2+ gamma-vibrational band. From 248Cm(α,α’),(d,d’).
  1172(5-)   E(level): Kπ=1- octupole-vibrational band. From 248Cm(α,α’),(d,d’).
  12224+   E(level): From 248Cm(α,α’),(d,d’).
  1236(3-)   E(level): From 248Cm(α,α’),(d,d’).
  1284.46+   E(level): Kπ=2+ gamma-vibrational band.
  1295.27-   E(level): Kπ=1- octupole-vibrational band.
  1305(3-)   E(level): From 248Cm(α,α’),(d,d’).
  1319   E(level): From 248Cm(α,α’),(d,d’).
  1358   E(level): From 248Cm(α,α’),(d,d’).
  1399   E(level): From 248Cm(α,α’),(d,d’).
  1406.214+ 1.75 ps +9-7  E(level): Kπ=0+ g.s. band.
  1440   E(level): From 248Cm(α,α’),(d,d’).
  1452.48+   E(level): Kπ=2+ gamma-vibrational band.
  1466.09-   E(level): Kπ=1- octupole-vibrational band.
  1469   E(level): From 248Cm(α,α’),(d,d’).
E(level)Jπ(level)T1/2(level)Comments
  1484(3-)   E(level): From 248Cm(α,α’),(d,d’).
  1514   E(level): From 248Cm(α,α’),(d,d’).
  1552   E(level): From 248Cm(α,α’),(d,d’).
  1651   E(level): From 248Cm(α,α’),(d,d’).
  1669.410+   E(level): Kπ=2+ gamma-vibrational band.
  1682.511-   E(level): Kπ=1- octupole-vibrational band.
  1784.116+ 1.43 ps +9-11  E(level): Kπ=0+ g.s. band.
  1883   E(level): From 248Cm(α,α’),(d,d’).
  1929.112+   E(level): Kπ=2+ gamma-vibrational band.
  1938   E(level): From 248Cm(α,α’),(d,d’).
  1942.113-   E(level): Kπ=1- octupole-vibrational band.
  1969   E(level): From 248Cm(α,α’),(d,d’).
  2000   E(level): From 248Cm(α,α’),(d,d’).
  2192.718+ 0.87 ps +9-7  E(level): Kπ=0+ g.s. band.
  2229.514+   E(level): Kπ=2+ gamma-vibrational band.
  2242.115-   E(level): Kπ=1- octupole-vibrational band.
  2566.916+   E(level): Kπ=2+ gamma-vibrational band.
  2578.317-   E(level): Kπ=1- octupole-vibrational band.
  2627.220+ 0.76 ps +11-8  E(level): Kπ=0+ g.s. band.
  2937.218+   E(level): Kπ=2+ gamma-vibrational band.
  2947.219-   E(level): Kπ=1- octupole-vibrational band.
  3083.622+ 0.44 ps 4  E(level): Kπ=0+ g.s. band.
  3331.720+   E(level): Kπ=2+ gamma-vibrational band.
  3347.021-   E(level): Kπ=1- octupole-vibrational band.
  3559.724+ 0.41 ps +9-6  E(level): Kπ=0+ g.s. band.
E(level)Jπ(level)T1/2(level)Comments
  3738.322+   E(level): Kπ=2+ gamma-vibrational band.
  3775.023-   E(level): Kπ=1- octupole-vibrational band.
  4055.526+ 0.32 ps +9-6  E(level): Kπ=0+ g.s. band.
  4158.124+   E(level): Kπ=2+ gamma-vibrational band.
  4229.425-   E(level): Kπ=1- octupole-vibrational band.
  4572.528+ 0.27 ps +18-9  E(level): Kπ=0+ g.s. band.
  4599.526+   E(level): Kπ=2+ gamma-vibrational band.
  4709.327-   E(level): Kπ=1- octupole-vibrational band.
  5114.130+   E(level): Kπ=0+ g.s. band.
  5215.929-   E(level): Kπ=1- octupole-vibrational band.
  5680.8(32+)   E(level): Kπ=0+ g.s. band.

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Additional Gamma Comments:

E(level)E(gamma)Comments
   143.80   100.4E(γ): from Coulomb excitation. Other: 100.2 4 from 252Cf α decay
   506.5   207.4E(γ): from 252Cf α decay. Other: 207.4 2 from Coulomb excitation
  1284.4   985E(γ): from 248Cm(209Bi,209Bi’γ)
  1460.5     7E(γ): from 248Cm(209Bi,209Bi’γ)
   954E(γ): from 248Cm(209Bi,209Bi’γ)

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