ADOPTED LEVELS, GAMMAS for 249Fm

Author: C.D. Nesaraja |  Citation: Nucl. Data Sheets 195, 718 (2024) |  Cutoff date: 12-Oct-2023 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-3.66×103 keV 16S(n)= 6450 keV 10S(p)= 4070 keV SYQ(α)= 7709 keV 6
Reference: 2021WA16

References:
  A  253No α decay 

General Comments:

All data are from 253No α decay

Q-value: ΔS(p)=50 (syst,2021Wa16)

Q-value: S(2n)=14300 180 (syst), S(2p)=7168 16 (2021Wa16)










E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
    0.0A (7/2+) 2.05 m 25 
% ε = 84 1
% α = 16 1
     
   58.20 17 A (9/2+)      58.3 2 
  100
(M1)
    0.0
(7/2+)
  129.2 3 A (11/2+)     129.2 4 
  100
E2
    0.0
(7/2+)
  140 20 ?A        
  209.30 20 A (5/2+)     209.3 2 
  100
M1
    0.0
(7/2+)
  248 17 A        
  279.80 16 A (9/2-)     150.6 3 
  221.7 2 
  279.7 2 
   19.9 19 
  100.0 34 
   46.3 23 
E1
E1
E1
  129.2
   58.20
    0.0
(11/2+)
(9/2+)
(7/2+)
  669.5 4 A (7/2-)     669.5 4 
  100
[E1]
    0.0
(7/2+)

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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[624]
    0.0 (7/2+) 2.05 m 25 
% ε = 84 1
% α = 16 1
     
   58.20 17  (9/2+)      58.3 2 
  100
(M1)
    0.0
(7/2+)
  129.2 3  (11/2+)     129.2 4 
  100
E2
    0.0
(7/2+)

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Additional Gamma Data:













E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityConversion
Coefficient		Additional Data
   58.20 (9/2+)      58.3 2 (M1)50.6α=50.6 9, α(L)=37.8 7, α(M)=9.36 16, α(N)=2.62 5, α(O)=0.691 12, α(P)=0.1342 23, α(Q)=0.00758 13
  129.2 (11/2+)     129.2 4 E28.19α=8.19 16, α(L)=5.88 12, α(M)=1.690 34, α(N)=0.481 10, α(O)=0.1216 24, α(P)=0.0195 4, α(Q)=9.24×10-5 17
  209.30 (5/2+)     209.3 2 M15.61α=5.61 8, α(K)=4.35 6, α(L)=0.945 13, α(M)=0.2335 33, α(N)=0.0652 9, α(O)=0.01722 25, α(P)=0.00334 5, α(Q)=0.0001866 27
  279.80 (9/2-)     150.6 3 E10.2151α=0.2151 32, α(K)=0.1594 23, α(L)=0.0416 6, α(M)=0.01035 15, α(N)=0.00287 4, α(O)=0.000734 11, α(P)=0.0001266 19, α(Q)=4.54×10-6 7
(9/2-)     221.7 2 E10.0916α=0.0916 13, α(K)=0.0698 10, α(L)=0.01631 23, α(M)=0.00404 6, α(N)=0.001119 16, α(O)=0.000289 4, α(P)=5.14×10-5 7, α(Q)=2.054E-6 29
(9/2-)     279.7 2 E10.0556α=0.0556 8, α(K)=0.0429 6, α(L)=0.00953 13, α(M)=0.002349 33, α(N)=0.000652 9, α(O)=0.0001687 24, α(P)=3.05×10-5 4, α(Q)=1.294E-6 18
  669.5 (7/2-)     669.5 4 [E1]0.01023α=0.01023 14, α(K)=0.00814 11, α(L)=0.001571 22, α(M)=0.000382 5, α(N)=0.0001059 15, α(O)=2.77×10-5 4, α(P)=5.22E-6 7, α(Q)=2.64E-7 4

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
    0.0(7/2+) 2.05 m 25 
% ε = 84 1
% α = 16 1
E(level): 7/2[624].
   58.20(9/2+)   E(level): 7/2[624].
  129.2(11/2+)   E(level): 7/2[624].
  209.30(5/2+)   Configuration=5/2[622] (2012He09).
  279.80(9/2-)   Configuration=9/2[734] (2012He09).
  669.5(7/2-)   Configuration=7/2[743] (2012He09).

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Additional Gamma Comments:

E(level)E(gamma)Comments
   58.20   58.3M(γ): From 2012He09 who notes that for M1 transition, the expected I(γ+ce)(58.3γ)/I(γ+ce)(221.5γ)=1. The experimental ratio is 0.73 25 for M1, 4.1 15 for E2, 0.022 10 for E1; thus M1 (or M1 with small E2 admixture) for 58.3γ is most probable.
  129.2  129.2M(γ): From α(LMN+)exp=4.0 18 (2006Lo12),.
  209.30  209.3M(γ): From α(LMN+)exp==2.8 22 (2006Lo12), α(K)exp=4.4 12 (2012He09), α(K)exp=4.9 19 (2012He09) α(LMN+)exp=3.42 87 (2011Lo06)
  279.80  150.6M(γ): From α(LMN+)exp=0.11 3 (2006Lo12), α(K)exp<0.98 (2004He28), α(L)exp<0.3 (2004He28), α(LMN+)exp=0.11 2 (2011Lo06)
  221.7M(γ): From α(LMN+)exp=0.04 1 (2006Lo12), α(K)exp<0.17 (2004He28), α(L)exp<0.05 (2004He28), α(LMN+)exp=0.023 4 (2011Lo06)
  279.7M(γ): α(LMN+)exp=0.08 2 (2006Lo12), α(K)exp=0.12 3 (2006Lo12), α(K)exp<0.35 (2004He28), α(L)exp<0.1 (2004He28), α(K)exp=0.145 22 (2011Lo06), α(LMN+)=0.076 12 (2011Lo06).

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