ADOPTED LEVELS, GAMMAS for 248Fm

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-)=-5050 keV SYS(n)= 7850 keV SYS(p)= 3970 keV 21Q(α)= 7995 keV 8
Reference: 2021WA16

References:
  A  252No α decay  B  202Hg(48Ca,2nγ)







E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)Final Levels
      0.0AB 0+ 34.5 s 12 
% SF = 0.10 5
% ε < 7
% α < 100
    
     46 1 AB (2+)      46 1 S
 
      0.0
0+
    152 2  B (4+)     106 1 S
 
     46
(2+)
    317.2 3  B (6+)     165.2 3 
  100
    152
(4+)
    538.6 4  B (8+)     221.4 4 
  100
    317.2
(6+)
    813.3 5  B (10+)     274.7 3 
  100
    538.6
(8+)
  ≈1080? B 10.1 ms 6 
% IT = ?
% ε = ?
% α = ?
    
   1137.3 6  B (12+)     324.0 3 
  100
    813.3
(10+)
   1507.7 7  B (14+)     370.4 3 
  100
   1137.3
(12+)
   1921 2  B (16+)     413 1 
  100
   1507.7
(14+)
   2372 2  B (18+)     451 1 
  100
   1921
(16+)

E(level): From the Eγ data

Jπ(level): Member of the g.s. rotational band

E(γ): From 202Hg(48Ca,2nγ). The 46 and 106 transitions are not observed in that reaction. The energies are from a fit to a rotational band formula.

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Band Transitions:

E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)Final Levels
Band 1 - Kπ=0+ GS band.
      0.0 0+ 34.5 s 12 
% SF = 0.10 5
% ε < 7
% α < 100
    
     46 1  (2+)      46 1 S
 
      0.0
0+
    152 2  (4+)     106 1 S
 
     46
(2+)
    317.2 3  (6+)     165.2 3 
  100
    152
(4+)
    538.6 4  (8+)     221.4 4 
  100
    317.2
(6+)
    813.3 5  (10+)     274.7 3 
  100
    538.6
(8+)
   1137.3 6  (12+)       
   1507.7 7  (14+)     370.4 3 
  100
   1137.3
(12+)
   1921 2  (16+)     413 1 
  100
   1507.7
(14+)
   2372 2  (18+)     451 1 
  100
   1921
(16+)

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
      0.00+ 34.5 s 12 
% SF = 0.10 5
% ε < 7
% α < 100
E(level): Kπ=0+ GS band.
     46(2+)   E(level): Kπ=0+ GS band.
    152(4+)   E(level): Kπ=0+ GS band.
    317.2(6+)   E(level): Kπ=0+ GS band.
    538.6(8+)   E(level): Kπ=0+ GS band.
    813.3(10+)   E(level): Kπ=0+ GS band.
   1080 10.1 ms 6 
% IT = ?
% ε = ?
% α = ?
No definitive configuration assignment can be made. See 2010KeZY for a discussion of several possibilities.
   1137.3(12+)   E(level): Kπ=0+ GS band.
   1507.7(14+)   E(level): Kπ=0+ GS band.
   1921(16+)   E(level): Kπ=0+ GS band.
   2372(18+)   E(level): Kπ=0+ GS band.

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