ADOPTED LEVELS, GAMMAS for 248Cm

Author: M. J. Martin |  Citation: Nucl. Data Sheets 122, 377 (2014) |  Cutoff date: 1-Sep-2014 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-687 keV SYS(n)= 6212 keV 5S(p)= 7050 keV SYQ(α)= 5161.73 keV 25
Reference: 2012WA38

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








E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
     0.0ABCDE 0+ 3.48×10+5 y 6 
% α = 91.61 16
% SF = 8.39 16
     
    43.40 3 A CDE 2+ 122.5 ps 25      43.399 25 
 
E2
     0.0
0+
   143.80 21 A CD  4+ 80 ps +14-19     100.4 2 
 
E2
    43.40
2+
   298.9 3 A CD  6+ 34 ps +11-3     155.1 2 
 
E2
   143.80
4+
   506.4 4 A CD  8+ 16.0 ps +31-23     207.4 2 
 
E2
   298.9
6+
   762.8 4   C   10+ 7.5 ps +7-6     256.4 2 
 
E2
   506.4
8+
  1050 2   CD  (2+) 1.23 ps +18-16       
  1050 2    D  1-        
  1064.1 4   C   12+ 3.71 ps +22-18     301.3 2 
 
E2
   762.8
10+
  1084  C E 0+        
  1095 2   CD  3-        
  1131 3   CD  2+        
  1144 2   CD  4+        
  1172 3   CD  5-        
  1222 3   CD  4+        
  1236 2    D  (3-)        
  1284.4 8   C   6+        
  1295.1 5   C   7-      789.0 5 
   996.4 5 
 
 


   506.4
   298.9
8+
6+
  1305 3    D  (3-)        
  1319 3    D         
  1358 3    D         
  1399 3    D         
  1406.2 5   C   14+ 1.75 ps +9-7     342.0 3 
 
E2
  1064.1
12+
  1440 3    D         
  1452.3 6   C   8+      167.9 5 
   946.1 5 
   ≤76
  ≤100


  1284.4
   506.4
6+
8+
  1465.9 5   C   9-      171.2 5 
   703.1 4 
   959.0 5 
    22 5 
   100 8 
     5.1 47 



  1295.1
   762.8
   506.4
7-
10+
8+
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
  1466.1 4   C   8+     1167.3 4 
 

   298.9
6+
  1469 4    D         
  1484 2    D  (3-)        
  1514 3    D         
  1552 4    D         
  1651 4    D         
  1651.8 5   C   10+      185.9 4 
  1145.4 4 
   100 21 
    44 19 


  1466.1
   506.4
8+
8+
  1669.3 5   C   10+      217.1 5 
   906.6 4 
   <52
   100 33 


  1452.3
   762.8
8+
10+
  1682.4 5   C   11-      216.4 4 
   618.3 3 
   919.6 4 
    16 7 
   100 10 
   ≤15



  1466.1
  1064.1
   762.8
8+
12+
10+
  1784.0 5   C   16+ 1.43 ps +9-11     377.8 2 
 
E2
  1406.2
14+
  1880.2 5   C   12+      228.4 4 
  1117.4 5 
   100 9 
    10 5 


  1651.8
   762.8
10+
10+
  1883 3    D         
  1929.1 5   C   12+      259.9 4 
   865.2 4 
    47 12 
   100 14 


  1669.3
  1064.1
10+
12+
  1938 4    D         
  1942.1 5   C   13-      259.6 3 
   535.9 3 
   877.9 4 
    39 5 
   100 6 
     9 4 



  1682.4
  1406.2
  1064.1
11-
14+
12+
  1969 4    D         
  2000 4    D         
  2150.1 5   C   14+      270.0 5 
  1085.5 5 
   100 3 
     6.3 56 


  1880.2
  1064.1
12+
12+
  2192.7 5   C   18+ 0.87 ps +9-7     408.6 2 
 
E2
  1784.0
16+
  2229.5 5   C   14+      300.8 4 
   822.9 4 
   100 60 
    93 15 


  1929.1
  1406.2
12+
14+
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
  2242.1 5   C   15-      300.0 3 
   458.1 3 
   835.9 4 
    89 24 
   100 7 
     7 3 



  1942.1
  1784.0
  1406.2
13-
16+
14+
  2460.6 6   C   16+      310.2 5 
  1054.7 5 
   100 12 
   <13


  2150.1
  1406.2
14+
14+
  2566.8 5   C   16+      337.4 3 
   782.7 4 
   100 4 
    26.4 24 


  2229.5
  1784.0
14+
16+
  2578.2 5   C   17-      336.2 3 
   385.7 3 
   794.3 4 
   100 4 
    26.4 24 
     9.2 22 



  2242.1
  2192.7
  1784.0
15-
18+
16+
  2627.1 5   C   20+ 0.76 ps +11-8     434.4 2 
 
E2
  2192.7
18+
  2808.6 8   C   18+      348.0 5 
 

  2460.6
16+
  2937.2 6   C   18+      370.3 3 
   744.6 4 
   100 12 
    31 10 


  2566.8
  2192.7
16+
18+
  2947.2 6   C   19-      320.1 5 
   369.4 4 
   754.0 5 
     9 3 
   100 6 
     7 3 



  2627.1
  2578.2
  2192.7
20+
17-
18+
  3083.5 6   C   22+ 0.44 ps 4     456.4 2 
 
E2
  2627.1
20+
  3190.1 9   C   20+      381.5 5 
 

  2808.6
18+
  3331.7 6   C   20+      394.6 4 
   704.5 5 
   100 20 
   ≤18


  2937.2
  2627.1
18+
20+
  3347.2 7   C   21-      263.5 5 ?
   400.0 4 
   719.6 5 ?
   ≤12
   100 11 
   ≤10



  3083.5
  2947.2
  2627.1
22+
19-
20+
  3559.6 6   C   24+ 0.41 ps +9-6     476.1 2 
 
E2
  3083.5
22+
  3601.9 11   C   22+      411.8 5 
 

  3190.1
20+
  3738.3 7   C   22+      406.6 4 
 

  3331.7
20+
  3775.2 8   C   23-      428.0 4 
 

  3347.2
21-
  4041.0 12   C   24+      439.1 5 
 

  3601.9
22+
  4055.4 7   C   26+ 0.32 ps +9-6     495.8 3 
 
E2
  3559.6
24+
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
  4158.1 9   C   24+      419.8 5 
 

  3738.3
22+
  4229.6 9   C   25-      454.4 4 
 

  3775.2
23-
  4572.4 8   C   28+ 0.27 ps +18-9     517.0 4 
 
E2
  4055.4
26+
  4599.5 10   C   26+      441.4 5 
 

  4158.1
24+
  4709.5 10   C   27-      479.9 5 
 

  4229.6
25-
  5114.0 10   C   30+      541.6 5 
 

  4572.4
28+
  5216.1 12   C   29-      506.6 5 
 

  4709.5
27-
  5680.7 11 ?  C   (32+)      566.7 5 ?
 

  5114.0
30+

E(level): No decay from the lower members of the Kπ=1- octupole-vibrational band up to 5-, or from the Kπ=2+ γ-vibrational and Kπ=0+ bands up to 6+ has been observed. Also, the 6+ member of the Kπ=0+ band has not been seen in any dataset

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

T1/2(level): Values for the excited levels are from B(E2) in Coulomb excitation

E(γ): Eγ for the levels up to 8+ are weighted averages of values from 252Cf α decay and Coulomb excitation. Values for the higher levels are from Coulomb excitation

I(γ): From branching ratios as given in Coulomb excitation

M(γ): From Coulomb excitation

Back to top

Band Transitions:

E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 1 - Kπ=0+ GS band
     0.0 0+ 3.48×10+5 y 6 
% α = 91.61 16
% SF = 8.39 16
     
    43.40 3  2+ 122.5 ps 25      43.399 25 
 
E2
     0.0
0+
   143.80 21  4+ 80 ps +14-19     100.4 2 
 
E2
    43.40
2+
   298.9 3  6+ 34 ps +11-3     155.1 2 
 
E2
   143.80
4+
   506.4 4  8+ 16.0 ps +31-23     207.4 2 
 
E2
   298.9
6+
   762.8 4  10+ 7.5 ps +7-6     256.4 2 
 
E2
   506.4
8+
  1064.1 4  12+ 3.71 ps +22-18       
  1406.2 5  14+ 1.75 ps +9-7       
  1784.0 5  16+ 1.43 ps +9-11     377.8 2 
 
E2
  1406.2
14+
  2192.7 5  18+ 0.87 ps +9-7       
  2627.1 5  20+ 0.76 ps +11-8       
  3083.5 6  22+ 0.44 ps 4       
  3559.6 6  24+ 0.41 ps +9-6       
  4055.4 7  26+ 0.32 ps +9-6       
  4572.4 8  28+ 0.27 ps +18-9       
  5114.0 10  30+        
  5680.7 11  (32+)        
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-     
  1295.1 5  7-      789.0 5 
   996.4 5 
 
 


   506.4
   298.9
8+
6+
  1465.9 5  9-      171.2 5 
   703.1 4 
   959.0 5 
    22 5 
   100 8 
     5.1 47 



  1295.1
   762.8
   506.4
7-
10+
8+
  1682.4 5  11-      216.4 4 
   618.3 3 
   919.6 4 
    16 7 
   100 10 
   ≤15



  1466.1
  1064.1
   762.8
8+
12+
10+
  1942.1 5  13-        
  2242.1 5  15-        
  2578.2 5  17-      336.2 3 
   385.7 3 
   794.3 4 
   100 4 
    26.4 24 
     9.2 22 



  2242.1
  2192.7
  1784.0
15-
18+
16+
  2947.2 6  19-        
  3347.2 7  21-        
  3775.2 8  23-        
  4229.6 9  25-        
  4709.5 10  27-        
  5216.1 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 8  6+     
  1452.3 6  8+      167.9 5 
   946.1 5 
   ≤76
  ≤100


  1284.4
   506.4
6+
8+
  1669.3 5  10+      217.1 5 
   906.6 4 
   <52
   100 33 


  1452.3
   762.8
8+
10+
  1929.1 5  12+      259.9 4 
   865.2 4 
    47 12 
   100 14 


  1669.3
  1064.1
10+
12+
  2229.5 5  14+        
  2566.8 5  16+        
  2937.2 6  18+      370.3 3 
   744.6 4 
   100 12 
    31 10 


  2566.8
  2192.7
16+
18+
  3331.7 6  20+        
  3738.3 7  22+        
  4158.1 9  24+        
  4599.5 10  26+        
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 4 - Kπ=0+ band
  1084 0+        
  1131 3  2+     
  1222 3  4+     
  1466.1 4  8+     1167.3 4 
 

   298.9
6+
  1651.8 5  10+      185.9 4 
  1145.4 4 
   100 21 
    44 19 


  1466.1
   506.4
8+
8+
  1880.2 5  12+      228.4 4 
  1117.4 5 
   100 9 
    10 5 


  1651.8
   762.8
10+
10+
  2150.1 5  14+        
  2460.6 6  16+        
  2808.6 8  18+      348.0 5 
 

  2460.6
16+
  3190.1 9  20+        
  3601.9 11  22+        
  4041.0 12  24+        

Back to top

Additional Gamma Data:













E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityConversion
Coefficient		Additional Data
    43.40 2+ 122.5 ps 25      43.399 25 E21000B(E2)(W.u.)=324 4, α=1000 15
   143.80 4+ 80 ps +14-19     100.4 2 E218.4B(E2)(W.u.)=380 +120-50, α=18.4 3
   298.9 6+ 34 ps +11-3     155.1 2 E22.71B(E2)(W.u.)=550 +40-140, α=2.71 4
   506.4 8+ 16.0 ps +31-23     207.4 2 E20.858B(E2)(W.u.)=540 90, α=0.858 12
   762.8 10+ 7.5 ps +7-6     256.4 2 E20.401B(E2)(W.u.)=530 50, α=0.401 6
  1064.1 12+ 3.71 ps +22-18     301.3 2 E20.236B(E2)(W.u.)=540 30, α=0.236 4
  1406.2 14+ 1.75 ps +9-7     342.0 3 E20.1608B(E2)(W.u.)=640 30, α=0.1608 23
  1784.0 16+ 1.43 ps +9-11     377.8 2 E20.1210B(E2)(W.u.)=500 40, α=0.1210 17
  2192.7 18+ 0.87 ps +9-7     408.6 2 E20.0978B(E2)(W.u.)=560 50, α=0.0978 14
  2627.1 20+ 0.76 ps +11-8     434.4 2 E20.0834B(E2)(W.u.)=480 60, α=0.0834 12
  3083.5 22+ 0.44 ps 4     456.4 2 E20.0735B(E2)(W.u.)=660 +60-50, α=0.0735 11
  3559.6 24+ 0.41 ps +9-6     476.1 2 E20.0662B(E2)(W.u.)=570 100, α=0.0662 10
  4055.4 26+ 0.32 ps +9-6     495.8 3 E20.0601B(E2)(W.u.)=610 +140-130, α=0.0601 9
  4572.4 28+ 0.27 ps +18-9     517.0 4 E20.0544B(E2)(W.u.)=580 +290-130, α=0.0544 8

Back to top

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 is recommended by 2000Ho27 from a weighted average of 4.22 12 (1969Me01), 4.20 5 (1971Ma32), and 4.11 3 (1971Mc19) in units of 10×106 years.
E(level): Kπ=0+ GS band.
    43.402+ 122.5 ps 25  E(level): Kπ=0+ GS band.
Jπ(level): E2 γ to level with J=J-2.
   143.804+ 80 ps +14-19  E(level): Kπ=0+ GS band.
Jπ(level): E2 γ to level with J=J-2.
   298.96+ 34 ps +11-3  E(level): Kπ=0+ GS band.
Jπ(level): E2 γ to level with J=J-2.
   506.48+ 16.0 ps +31-23  E(level): Kπ=0+ GS band.
Jπ(level): E2 γ to level with J=J-2.
   762.810+ 7.5 ps +7-6  E(level): Kπ=0+ GS band.
Jπ(level): E2 γ to level with J=J-2.
  1050(2+) 1.23 ps +18-16  E(level): Kπ=2+ GAMMA-VIBRATIONAL band.
  10501-   E(level): Kπ=1- OCTUPOLE-VIBRATIONAL band.
  1064.112+ 3.71 ps +22-18  E(level): Kπ=0+ GS band.
Jπ(level): E2 γ to level with J=J-2.
  10840+   E(level): Kπ=0+ band.
  10953-   B(E3)=0.41 10
E(level): Kπ=1- OCTUPOLE-VIBRATIONAL band.
  11312+   E(level): Kπ=0+ band.
  11444+   E(level): Kπ=2+ GAMMA-VIBRATIONAL band.
  11725-   E(level): Kπ=1- OCTUPOLE-VIBRATIONAL band.
  12224+   E(level): Kπ=0+ band.
  1284.46+   E(level): Kπ=2+ GAMMA-VIBRATIONAL band.
  1295.17-   E(level): Kπ=1- OCTUPOLE-VIBRATIONAL band.
  1406.214+ 1.75 ps +9-7  E(level): Kπ=0+ GS band.
Jπ(level): E2 γ to level with J=J-2.
  1452.38+   E(level): Kπ=2+ GAMMA-VIBRATIONAL band.
  1465.99-   E(level): Kπ=1- OCTUPOLE-VIBRATIONAL band.
  1466.18+   E(level): Kπ=0+ band.
  1651.810+   E(level): Kπ=0+ band.
  1669.310+   E(level): Kπ=2+ GAMMA-VIBRATIONAL band.
  1682.411-   E(level): Kπ=1- OCTUPOLE-VIBRATIONAL band.
  1784.016+ 1.43 ps +9-11  E(level): Kπ=0+ GS band.
Jπ(level): E2 γ to level with J=J-2.
E(level)Jπ(level)T1/2(level)Comments
  1880.212+   E(level): Kπ=0+ band.
  1929.112+   E(level): Kπ=2+ GAMMA-VIBRATIONAL band.
  1942.113-   E(level): Kπ=1- OCTUPOLE-VIBRATIONAL band.
  2150.114+   E(level): Kπ=0+ band.
  2192.718+ 0.87 ps +9-7  E(level): Kπ=0+ GS band.
Jπ(level): E2 γ to level with J=J-2.
  2229.514+   E(level): Kπ=2+ GAMMA-VIBRATIONAL band.
  2242.115-   E(level): Kπ=1- OCTUPOLE-VIBRATIONAL band.
  2460.616+   E(level): Kπ=0+ band.
  2566.816+   E(level): Kπ=2+ GAMMA-VIBRATIONAL band.
  2578.217-   E(level): Kπ=1- OCTUPOLE-VIBRATIONAL band.
  2627.120+ 0.76 ps +11-8  E(level): Kπ=0+ GS band.
Jπ(level): E2 γ to level with J=J-2.
  2808.618+   E(level): Kπ=0+ band.
  2937.218+   E(level): Kπ=2+ GAMMA-VIBRATIONAL band.
  2947.219-   E(level): Kπ=1- OCTUPOLE-VIBRATIONAL band.
  3083.522+ 0.44 ps 4  E(level): Kπ=0+ GS band.
Jπ(level): E2 γ to level with J=J-2.
  3190.120+   E(level): Kπ=0+ band.
  3331.720+   E(level): Kπ=2+ GAMMA-VIBRATIONAL band.
  3347.221-   E(level): Kπ=1- OCTUPOLE-VIBRATIONAL band.
  3559.624+ 0.41 ps +9-6  E(level): Kπ=0+ GS band.
Jπ(level): E2 γ to level with J=J-2.
  3601.922+   E(level): Kπ=0+ band.
  3738.322+   E(level): Kπ=2+ GAMMA-VIBRATIONAL band.
  3775.223-   E(level): Kπ=1- OCTUPOLE-VIBRATIONAL band.
  4041.024+   E(level): Kπ=0+ band.
  4055.426+ 0.32 ps +9-6  E(level): Kπ=0+ GS band.
Jπ(level): E2 γ to level with J=J-2.
  4158.124+   E(level): Kπ=2+ GAMMA-VIBRATIONAL band.
E(level)Jπ(level)T1/2(level)Comments
  4229.625-   E(level): Kπ=1- OCTUPOLE-VIBRATIONAL band.
  4572.428+ 0.27 ps +18-9  E(level): Kπ=0+ GS band.
Jπ(level): E2 γ to level with J=J-2.
  4599.526+   E(level): Kπ=2+ GAMMA-VIBRATIONAL band.
  4709.527-   E(level): Kπ=1- OCTUPOLE-VIBRATIONAL band.
  5114.030+   E(level): Kπ=0+ GS band.
  5216.129-   E(level): Kπ=1- OCTUPOLE-VIBRATIONAL band.
  5680.7(32+)   E(level): Kπ=0+ GS band.

Back to top

Additional Gamma Comments:

E(level)E(gamma)Comments
  1295.1   789.0I(γ): Iγ(789γ):Iγ(996γ)= |<5.0 48:|<100 20
   996.4I(γ): Iγ(789γ):Iγ(996γ)= |<5.0 48:|<100 20
  1669.3   217.1I(γ): the authors report Iγ:Iγ(907γ)=22 30:100 33

Back to top