ADOPTED LEVELS, GAMMAS for 255Fm

Authors: E. Browne, J. K. Tuli |  Citation: Nucl. Data Sheets 114, 1041 (2013) |  Cutoff date: 1-Nov-2011 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-1043 keV 8S(n)= 5175 keV 5S(p)= 5481 keV 6Q(α)= 7239.7 keV 18
Reference: 2012WA38

References:
  A  255Es β- decay  B  255Md ε decay
  C  259No α decay 

General Comments:

Calculations, compilations:

Cluster decay (20O): 1994Ci12

Delayed neutron emission: 1989Br25

Favored α decays: 1993Bu09, 1992Bu03

Ground state configuration: 1995Ci09, 1995Du05

Single-particle Nilsson levels: 2005Pa73, 1994Cw02

Q(α), half-lives, and decay branching ratios: 2010Ni02, 2010Si27, 2009Sa25, 2008Do12

Spontaneous fission half-lives: 2004Ro01, 2000Ho27

1994Cw02 have calculated the following single-particle level sequence: g.s. 1/2[620], 0.01 MeV, 3/2[622]; 0.09 MeV, 7/2[613]; 0.14 MeV, 11/2[725]; 0.49 MeV, 9/2[615].










E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
    0.0ABC 7/2+ 20.07 h 7 
% α = 100
% SF = 2.4×10-5 10
     
   61.6 3 ABC (9/2+)      61.7
  100
[M1]
    0.0
7/2+
  231.1 2  BC 9/2+     169.5 2 
  231.1 2 
   11 1 
  100 11 
M1+E2
M1+E2
   61.6
    0.0
(9/2+)
7/2+

E(level): From 255Md ε decay, unless otherwise 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 - 7/2[613]
    0.0 7/2+ 20.07 h 7 
% α = 100
% SF = 2.4×10-5 10
     
   61.6 3  (9/2+)      61.7
  100
[M1]
    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
   61.6 (9/2+)      61.7[M1]42.9α=42.9 9

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
    0.07/2+ 20.07 h 7 
% α = 100
% SF = 2.4×10-5 10
μ=-3.46, Q=10.6
E(level): 7/2[613].
   61.6(9/2+)   E(level): 7/2[613].

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