ADOPTED LEVELS, GAMMAS for 184Pb

Author: Coral M. Baglin |  Citation: Nucl. Data Sheets 111,275 (2010) |  Cutoff date: 1-Oct-2009 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-1.224×104 keV 8S(n)= 1.155×104 keV 3S(p)= 1753 keV 16Q(α)= 6774 keV 4
Reference: 2012WA38

References:
  A  148Sm(40Ca,4nγ)  B  188Po α decay
  C  185Bi p decay 

General Comments:

Production: 147,148Sm(40Ca,xn), E(40Ca)≈260 MeV (1980Du02).

For isotope shift data see, e.g., 2007De09.

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

Q-value: Uncertainty in Q(β-) is 130 (2003Au03, 2009AuZZ).










E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
     0.0ABC 0+ 490 ms 25 
% α = 80 15
% ε = 20 15
     
   570 30  B  (0+)     570
 
(E0)
     0.0
0+
   701.5A   (2+)     701.5
  100

     0.0
0+
   938.9A   (4+)     237.4
  100

   701.5
(2+)
  1261.6A   (6+)     322.7
  100

   938.9
(4+)
  1663.4A   (8+)     401.8
  100

  1261.6
(6+)

E(level): From adopted Eγ, except as noted.

Jπ(level): E(702 level) fits Jπ=2+ level-energy systematics for Pb isotopes; the 402γ-323γ-237γ cascade appears to form a rotational band similar to bands built on 2+ states in 186Pb and 188Pb (1998Co27).

E(γ): From 148Sm(40Ca,4nγ), except as noted; uncertainties unstated by authors.

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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+ PROLATE BAND?.
   570 30  (0+)        
   701.5 (2+)     701.5
  100

     0.0
0+
   938.9 (4+)     237.4
  100

   701.5
(2+)
  1261.6 (6+)     322.7
  100

   938.9
(4+)
  1663.4 (8+)     401.8
  100

  1261.6
(6+)

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.00+ 490 ms 25 
% α = 80 15
% ε = 20 15
Δ<r2>(184Pb,208Pb)=-1.150 5 (2007De09). See also 2006Se18.
E(level): Δ<r2>(184Pb,208Pb)=-1.150 5 (2007De09). See also 2006Se18.
   570(0+)   Very tentatively associated with 0+ prolate structures known in 186Pb and 188Pb (1999An52); however, a 0+ oblate state is also expected (based on systematics) at comparable energy, and the proximity of these states may result in highly mixed configurations.
E(level): Very tentatively associated with 0+ prolate structures known in 186Pb and 188Pb (1999An52); however, a 0+ oblate state is also expected (based on systematics) at comparable energy, and the proximity of these states may result in highly mixed configurations. Kπ=0+ PROLATE BAND?.
   701.5(2+)   E(level): Kπ=0+ PROLATE BAND?.
   938.9(4+)   E(level): Kπ=0+ PROLATE BAND?.
  1261.6(6+)   E(level): Kπ=0+ PROLATE BAND?.
  1663.4(8+)   E(level): Kπ=0+ PROLATE BAND?.

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Additional Gamma Comments:

E(level)E(gamma)Comments
   570   570E(γ): from level energy difference; ce only were observed, E(ce) unstated by authors.
M(γ): from 188Po α decay, based on observation of ce-α coin but absence of γ-α coin in 188Po α decay.

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