ADOPTED LEVELS, GAMMAS for 168Dy

Author: Coral M. Baglin |  Citation: Nucl. Data Sheets 111, 1807 (2010) |  Cutoff date: 15-Jun-2010 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=1.50×103 keV 15S(n)= 6.70×103 keV 16S(p)= 9.92×103 keV SYQ(α)= -1.21×103 keV SY
Reference: 2012WA38

References:
  A  168Tb β- decay  B  170Er(82Se,84KrG)

General Comments:

Identification: genetic relationship to 168Ho activity, as observed in Dy/Ho fraction from spontaneous fission of 252Cf (1982Ge04).

The adopted level scheme is taken from 1999As03. The energy offset x for the 0.0+x and 227+x levels is possibly of the order of 1 MeV; see comment on tentative Jπ for these levels.

Other Reactions:

170Er(18O,20Ne) (1998Lu08): E(18O)=104 MeV; determined mass excess for 168Dy.

Q-value: Note: Current evaluation has used the following Q record

Q-value: ΔS(p)=420, ΔQ(α)=420 (2003Au03, 2009AuZZ).










E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
     0.0AB 0+ 8.7 m 3 
% β- = 100
     
     0.0+XA  (3+)        
    74.96 6 AB (2+)      74.96 6 
  100
[E2]
     0.0
0+
   227.03+X 16 A  (4-)     227.03 16 
  100
[E1]
     0.0+X
(3+)
   248.33 10 AB (4+)     173.37 8 
  100
[E2]
    74.96
(2+)
   516 B (6+)     268
  100
[E2]
   248.33
(4+)
   873 B (8+)     357
  100
[E2]
   516
(6+)
  1315 B (10+)     442
  100
[E2]
   873
(8+)

E(level): From Eγ.

Jπ(level): From apparent g.s. band structure in 170Er(82Se,84Krγ), except as noted.

E(γ): From 168Tb β- decay, except as 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 - Kπ=0+ GS band (2010So03).
     0.0 0+ 8.7 m 3 
% β- = 100
     
    74.96 6  (2+)        
   248.33 10  (4+)     173.37 8 
  100
[E2]
    74.96
(2+)
   516 (6+)     268
  100
[E2]
   248.33
(4+)
   873 (8+)     357
  100
[E2]
   516
(6+)
  1315 (10+)     442
  100
[E2]
   873
(8+)

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Additional Gamma Data:













E(level)
(keV)
Jπ(level)T1/2(level)E(γ)
(keV)
MultipolarityConversion
Coefficient
Additional Data
    74.96 (2+)      74.96 6 [E2]8.18α=8.18
   227.03+X (4-)     227.03 16 [E1]0.0349α=0.0349
   248.33 (4+)     173.37 8 [E2]0.383α=0.383
   516 (6+)     268[E2]0.0915α=0.0915
   873 (8+)     357[E2]0.0384α=0.0384
  1315 (10+)     442[E2]0.0210α=0.0210

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.00+ 8.7 m 3 
% β- = 100
E(level): From 170Er(82Se,84Krγ); uncertainties unstated by authors. Kπ=0+ GS band (2010So03).
     0.0+X(3+)   Jπ(level): Speculative value from 1999As03, who assign the 227γ as an interband γ because its energy exceeds that expected from systematics for intraband γ’s in lighter even-even Dy, in which intense octupole to γ band ΔJ=-1 transitions are known. Strong β- feeding from (4-) 168Tb to the J=4 member of the octupole band is likely, and band energy systematics suggest that the J=4 member of the octupole band and the J=3 member of the γ band lie in the vicinity of 1300 and 1050, respectively, consistent with observed Eγ. Poor statistics precluded the observation by 1999As03 of expected transitions connecting the γ and g.s. bands.
    74.96(2+)   E(level): From 170Er(82Se,84Krγ); uncertainties unstated by authors. Kπ=0+ GS band (2010So03).
   227.03+X(4-)   Jπ(level): Speculative value from 1999As03, who assign the 227γ as an interband γ because its energy exceeds that expected from systematics for intraband γ’s in lighter even-even Dy, in which intense octupole to γ band ΔJ=-1 transitions are known. Strong β- feeding from (4-) 168Tb to the J=4 member of the octupole band is likely, and band energy systematics suggest that the J=4 member of the octupole band and the J=3 member of the γ band lie in the vicinity of 1300 and 1050, respectively, consistent with observed Eγ. Poor statistics precluded the observation by 1999As03 of expected transitions connecting the γ and g.s. bands.
   248.33(4+)   E(level): From 170Er(82Se,84Krγ); uncertainties unstated by authors. Kπ=0+ GS band (2010So03).
   516(6+)   E(level): From 170Er(82Se,84Krγ); uncertainties unstated by authors. Kπ=0+ GS band (2010So03).
   873(8+)   E(level): From 170Er(82Se,84Krγ); uncertainties unstated by authors. Kπ=0+ GS band (2010So03).
  1315(10+)   E(level): From 170Er(82Se,84Krγ); uncertainties unstated by authors. Kπ=0+ GS band (2010So03).

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