ADOPTED LEVELS, GAMMAS for 228Ac

Author: Khalifeh Abusaleem |  Citation: Nucl. Data Sheets 116, 163 (2014) |  Cutoff date: 31-Dec-2012 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=2124 keV 3S(n)= 5026.0 keV 25S(p)= 5572.0 keV 24Q(α)= 4676 keV 13
Reference: 2012WA38

References:
  A  228Ra β- decay 

General Comments:

Calculations, compilations, systematics:

α-decay half life: 2012Po01

Level structure in odd-odd actinides: 1994So16

Octupole deformation in odd-odd nuclei: 1988Sh01

Spontaneous emission of heavy ions: 1986Po06

Discussion of level configurations: 1995So11

Allowed β transitions in heavy nuclei: 2009So02, 2006Xu10

1969Lu12 assign a 4.27 MeV α with %α=5.5×10-6 22 to this nucleus. However, such α decay gives an α HF=3.9×10-4, an extremely unreasonable value. It appears that the α has been misassigned.

2006Xu10: Observed β-delayed fission of 228Ac. 228Ac source was chemically prepared from Thorium solution, then exposed to mica foils (α-detector) and HPGe (γ-detector) for 720 days. 17 α-events were observed. These were interpreted from 228Ac fission based on analysis of β- decay energy and fission systematics. Also, several γ-rays were observed and interpreted from the β- decay of 228Ac. These γ-rays are presented in figure 2 of 2006Xu10. No γ-uncertainty, intensity, or level energies are given. Probability of β-delayed fission (NβDF/Nβ) was found to be 5×10-12 2

Gammas: γ data are from 228Ra β- decay

Q-value: Q(β-)= 2124 3; S(n)= 5026 3; S(p)= 5572 2; Q(α)= 4810 50 2003Au03









E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		M(γ)Final Levels
   0A 3+ 6.15 h 2 
% β- = 100
    
   6.28 3 A 1-      6.28 3 
(M2)
   0
3+
   6.670 20 A 1+      6.67 2 
E2
   0
3+
  20.19 3 A 1-     13.52 2 
E1
   6.670
1+
  33.07 11 A 1+     12.75 5 ?
  26.4 1 
[E1+M2]
M1+E2
  20.19
   6.670
1-
1+

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Additional Gamma Data:













E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityConversion
Coefficient		Additional Data
   6.28 1-      6.28 3 (M2)6.68×106α=6.68×106 19
   6.670 1+      6.67 2 E21.56×106α=1.56×106 4
  20.19 1-     13.52 2 E15.86α=5.86 9

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
   03+ 6.15 h 2 
% β- = 100
Configuration=((π 3/2[651])(ν 3/2[631])), K=3.
   6.281-   Configuration=((π 3/2[532])(ν 3/2[631])), K=0.
   6.6701+   Configuration=((π 3/2[651])(ν 3/2[631])), K=0.
  20.191-   Configuration=((π 3/2[532])(ν 5/2[633])), K=1.
  33.071+   Configuration=((π 3/2[651])(ν 5/2[633])), K=1.

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