ADOPTED LEVELS, GAMMAS for 253Cf

Authors: E. Browne, J. K. Tuli |  Citation: Nucl. Data Sheets 114, 1041 (2013) |  Cutoff date: 1-Mar-2012 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=287 keV 6S(n)= 4804 keV 4S(p)= 6522 keV SYQ(α)= 6126 keV 4
Reference: 2012WA38

References:
  A  257Fm α decay 

General Comments:

Calculations, compilations:

Favored α decay: 2011Zh36, 1993Bu09, 1992Bu03

g.s. properties: 1997Mo25, 1995Mo29, 2005Pa73

Single-particle Nilsson levels: 1994Cw02, 2005Pa73

1994Cw02 have calculated the following predominant configurations: g.s., 1/2[620]; 20 keV, 3/2[622]; 50 keV, 7/2[613]; 170 keV, 11/2[725]; 430 keV, 9/2[615].

2005Pa73 have calculated the following predominant configurations: g.s., 1/2[620]; 10 keV, 3/2[622]; 100 keV, 11/2[725]; 100 keV, 7/2[613]; 440 keV, 9/2[615].

Gammas: All γ data are from 257Fm α decay

Q-value: Estimated ΔS(p)=200 (2012Wa38)










E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
    0.0A (7/2+) 17.81 d 8 
% β- = 99.69 4
% α = 0.31 4
     
   61.61 8 A (9/2+)      61.6 1 
  100
M1+E2
    0.0
(7/2+)
  136.62 9 A (11/2+)      75.0 1 
  136.7 2 
  100 9 
   30 10 
(M1)

   61.61
    0.0
(9/2+)
(7/2+)
  241.01 8 A (9/2+)     104.4 1 
  179.4 1 
  241.0 1 
    5.6 5 
   79 6 
  100 6 
(M1)
M1+E2
M1+E2
  136.62
   61.61
    0.0
(11/2+)
(9/2+)
(7/2+)
  321.21 22 A (11/2+)      80.2 2 
  100
(M1+E2)
  241.01
(9/2+)
  417 5 A (13/2+)      96 5 S
  100
[M1,E2]
  321.21
(11/2+)

E(level): From 257Fm α decay. The band assignments are those proposed by 1967As02 and 1982Ah01.

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Band Transitions:

E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 1 - Band 7/2+[613].
    0.0 (7/2+) 17.81 d 8 
% β- = 99.69 4
% α = 0.31 4
     
   61.61 8  (9/2+)      61.6 1 
  100
M1+E2
    0.0
(7/2+)
  136.62 9  (11/2+)      75.0 1 
  136.7 2 
  100 9 
   30 10 
(M1)

   61.61
    0.0
(9/2+)
(7/2+)
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 2 - Band 9/2+[615].
  241.01 8  (9/2+)        
  321.21 22  (11/2+)      80.2 2 
  100
(M1+E2)
  241.01
(9/2+)
  417 5  (13/2+)      96 5 S
  100
[M1,E2]
  321.21
(11/2+)

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Additional Gamma Data:















E(level)
(keV)
Jπ(level)T1/2(level)E(γ)
(keV)
MultipolarityMixing
Ratio
Conversion
Coefficient
Additional Data
   61.61 (9/2+)      61.6 1 M1+E20.27 247.4α=47.4 19, α(L)=35.1 14, α(M)=9.1 4, α(N)=2.52 12, α(O)=0.64 3, α(P)=0.117 5, α(Q)=0.00503 9, α(N+)=3.29 15
  136.62 (11/2+)      75.0 1 (M1) 19.7α=19.7, α(L)=14.72 22, α(M)=3.62 6, α(N)=1.004 15, α(O)=0.261 4, α(P)=0.0504 8, α(Q)=0.00298 5, α(N+)=1.318 20
  241.01 (9/2+)     104.4 1 (M1) 7.52α=7.52, α(L)=5.63 8, α(M)=1.386 20, α(N)=0.384 6, α(O)=0.0997 15, α(P)=0.0193 3, α(Q)=0.001136 17, α(N+)=0.504 8
(9/2+)     179.4 1 M1+E20.58 135.8α=5.8 5, α(K)=4.2 5, α(L)=1.182 17, α(M)=0.301 6, α(N)=0.0839 15, α(O)=0.0215 4, α(P)=0.00398 7, α(Q)=0.000185 18, α(N+)=0.1095 19
(9/2+)     241.0 1 M1+E21.06 131.78α=1.78 17, α(K)=1.22 16, α(L)=0.419 14, α(M)=0.109 3, α(N)=0.0304 8, α(O)=0.00775 21, α(P)=0.00140 5, α(Q)=5.4×10-5 7, α(N+)=0.0396 10
  321.21 (11/2+)      80.2 2 (M1+E2) 39α=39 24, α(L)=29 17, α(M)=8 5, α(N)=2.2 14, α(O)=0.6 4, α(P)=0.09 5, α(Q)=0.0014 10, α(N+)=2.9 18
  417 (13/2+)      96 5 [M1,E2] 18α=18 10, α(L)=13 7, α(M)=3.6 21, α(N)=1.0 6, α(O)=0.26 15, α(P)=0.043 22, α(Q)=0.0008 7, α(N+)=1.3 8

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
    0.0(7/2+) 17.81 d 8 
% β- = 99.69 4
% α = 0.31 4
E(level): Band 7/2+[613].
   61.61(9/2+)   E(level): Band 7/2+[613].
  136.62(11/2+)   E(level): Band 7/2+[613].
  241.01(9/2+)   E(level): Band 9/2+[615].
  321.21(11/2+)   E(level): Band 9/2+[615].
  417(13/2+)   E(level): Band 9/2+[615].

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