ADOPTED LEVELS, GAMMAS for 247Bk

Author: C. D. Nesaraja |  Citation: Nucl. Data Sheets 125, 395 (2015) |  Cutoff date: 31-Mar-2014 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-613 keV 16S(n)= 6550 keV 60S(p)= 4417 keV 5Q(α)= 5890 keV 5
Reference: 2012WA38

References:
  A  247Cf ε decay  B  251Es α decay
  C  246Cm(α,t) E=28, 29 MeV  D  249Bk(p,t) E=15 MeV

General Comments:

Identification:

1965Mi08: 247Bk produced by irradiating 246Cm sample with He ions from the Argonne 150-cm cyclotron. It was then followed by chemical purification and mass spectrometric measurements. Half-life was measured.

1956Ch77: 244,245,246Cm bombardment by 28-MeV He ions. Bk was chemically separated from the decay of 247Cf

Theoretical and Systematical studies:

2013Ni13,2012Ni16: α decay T1/2 for transitions from ground-state to favored rotational bands using multichannel cluster model (MCCM)

2012Sa05: Partial T1/2, α branching ratio to individual residual states using Coulomb and proximity potential model for deformed nuclei (CPPMDN).

2011Zh36: Systematic analysis of α decay to members of favored bands using the Geiger-Nutall law. Calculated the partial half-lives

2010Ni02: Systematics and calculations of T1/2 and relative intensities of α decay within the generalized density-dependent cluster model.

2004Pa40: Calculated deformation parameters and the proton one-quasiparticle states of heaviest nuclei using the macroscopic-microscopic approach

2003Re14: Calculated binding energy and Qα and ground-state deformations 2002Du16: Calculated partial half-lives for α and cluster decays

1997Mo25: Calculated ground-state binding energy, proton and neutron pairing gaps, neutron and proton separation energies, Q values and partial half-lives for α and β decays

1995Mo29, 1980Ho32: Calculated ground-state masses and nuclear ground-state deformations

1993Bu09: Calculated partial α decay half-life, α branching, and nuclear radius using the cluster model predictions

1985Lo17: Calculation of spontaneous fission half-life of ground-state.

1981Mo24: Calculated ground-state electric multipole moments Q2, Q4 and masses

1980Ho32: Calculated fission-barrier heights, deformation and energy at saddle-point were










E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
     0.0ABC  3/2- 1380 y 250 
% α ≤ 100
     
    29.88 11 ABC  (5/2-)      29.9 2 
  100

     0.0
3/2-
    40.81 11 AB D 7/2+      10.9S
   40.8 3 
 
 


    29.88
     0.0
(5/2-)
3/2-
    71.60 13 ABC  (7/2-)        
    82.81 23 AB D (9/2)+      42.0 2 
  100

    40.81
7/2+
   125.5 4 A C  (9/2-)        
   137 5    D (11/2+)        
   196 3   CD (13/2+)        
   265 2    D (15/2+)        
   334.92 12 A    (5/2)+     294.1 1 
  305.2 3 
  334.9 2 
  100 8 
    0.91 14 
    2.9 3 
M1


    40.81
    29.88
     0.0
7/2+
(5/2-)
3/2-
   378.1 6 ?A    (7/2+)     337.3 5 
  100

    40.81
7/2+
   447.80 9 A    (5/2-)     376.2 1 
  407.0 1 
  417.9 1 
  447.8 1 
   12.9 13 
   35 4 
   62 5 
  100 7 

(E1)
M1+E2
M1+E2
    71.60
    40.81
    29.88
     0.0
(7/2-)
7/2+
(5/2-)
3/2-
   487 3   C  (1/2+)        
   489.4 3 A    (7/2-)     363.9 2 
  417.9
  459.5 3 
  100 19 
 
  100 15 



   125.5
    71.60
    29.88
(9/2-)
(7/2-)
(5/2-)
   518 5   C  (3/2+)        
   541 3   C  (9/2-)        
   587 4   C  (13/2+)        
   704 4   C  (1/2-)        
   743 3   C  (5/2-)        
   815 4   C  (7/2-)        
   828 5   C  (9/2-)        
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
   904 3   C  (9/2-)        
   983 3   C         
  1149 4   C         
  1166 4   C  (13/2+)        

Jπ(level): Spin and parity assignments from (α,t) were based on L-values deduced from angular distributions and on relative peak intensities. Assignments from (p,t) were based on comparison of experimental spectroscopic factors with calculated ones.

E(γ): From 247Cf ε decay.

I(γ): Relative photon intensities de-exciting each level, as measured in 247Cf ε decay.

M(γ): From ce data taken in 247Cf ε decay.

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Band Transitions:

E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 1 - 3/2[521] band.
     0.0 3/2- 1380 y 250 
% α ≤ 100
     
    29.88 11  (5/2-)      29.9 2 
  100

     0.0
3/2-
    71.60 13  (7/2-)     
   125.5 4  (9/2-)        
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 2 - 7/2[633] band.
    40.81 11  7/2+        
    82.81 23  (9/2)+      42.0 2 
  100

    40.81
7/2+
   137 5  (11/2+)     
   196 3  (13/2+)        
   265 2  (15/2+)     
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 3 - 5/2[642] band.
   334.92 12  (5/2)+        
   378.1 6  (7/2+)     337.3 5 
  100

    40.81
7/2+
   587 4  (13/2+)     
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 4 - 5/2[523] band.
   447.80 9  (5/2-)        
   489.4 3  (7/2-)     363.9 2 
  417.9
  459.5 3 
  100 19 
 
  100 15 



   125.5
    71.60
    29.88
(9/2-)
(7/2-)
(5/2-)
   541 3  (9/2-)     
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 5 - 1/2[400] band.
   487 3  (1/2+)        
   518 5  (3/2+)     
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 6 - 1/2[521] band.
   704 4  (1/2-)        
   743 3  (5/2-)     
   815 4  (7/2-)     
   828 5  (9/2-)        
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 7 - 7/2[514] band.
   904 3  (9/2-)        
E(level)
(keV)		Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 8 - 9/2[624] BAND?.
  1166 4  (13/2+)        

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Additional Gamma Data:















E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityMixing
Ratio		Conversion
Coefficient		Additional Data
   334.92 (5/2)+     294.1 1 M1 1.651α=1.651
   447.80 (5/2-)     407.0 1 (E1) 0.0238α=0.0238
(5/2-)     417.9 1 M1+E20.68 240.494α=0.494 10
(5/2-)     447.8 1 M1+E21.0 20.319α=0.319 7

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.03/2- 1380 y 250 
% α ≤ 100
α calculated half-life of ≈10000 y for spontaneous fission (1985Lo17) yields %SF≈12.
E(level): α calculated half-life of ≈10000 y for spontaneous fission (1985Lo17) yields %SF≈12. 3/2[521] band.
    29.88(5/2-)   E(level): 3/2[521] band.
    40.817/2+   E(level): 7/2[633] band.
    71.60(7/2-)   E(level): 3/2[521] band.
    82.81(9/2)+   E(level): 7/2[633] band.
   125.5(9/2-)   E(level): 3/2[521] band.
   137(11/2+)   E(level): 7/2[633] band.
   196(13/2+)   E(level): 7/2[633] band.
   265(15/2+)   E(level): 7/2[633] band.
   334.92(5/2)+   E(level): 5/2[642] band.
   378.1(7/2+)   E(level): 5/2[642] band.
   447.80(5/2-)   E(level): 5/2[523] band.
   487(1/2+)   E(level): 1/2[400] band.
   489.4(7/2-)   E(level): 5/2[523] band.
   518(3/2+)   E(level): 1/2[400] band.
   541(9/2-)   E(level): 5/2[523] band.
   587(13/2+)   E(level): 5/2[642] band.
   704(1/2-)   E(level): 1/2[521] band.
   743(5/2-)   E(level): 1/2[521] band.
   815(7/2-)   E(level): 1/2[521] band.
   828(9/2-)   E(level): 1/2[521] band.
   904(9/2-)   E(level): 7/2[514] band.
  1166(13/2+)   E(level): 9/2[624] BAND?.

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