ADOPTED LEVELS, GAMMAS for 218Th

Author: Balraj Singh |  Citation: ENSDF |  Cutoff date: 10-Jun-2021 

Authors: Balraj Singh, M.S. Basunia, Murray Martin Et Al., |  Citation: Nucl. Data Sheets 160, 405 (2019) |  Cutoff date: 30-Oct-2019 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-6283 keV 21S(n)= 7910 keV 15S(p)= 3625 keV 15Q(α)= 9849 keV 9
Reference: 2021WA16

References:
  A  222U α decay (4.7 μs)  B  174Yb(48Ca,4nγ)
  C  206Pb(16O,4nγ),209Bi(14N,5nγ) 

General Comments:

218Th identified by 1973Hi06 in 209Bi(14N,5n) reaction and by 1973Ha32 in 206Pb(16O,4n), the two independent studies, 1973Hi06 published July 23, 1973, and 1973Ha32 on July 30, 1973.

Search for long-lived isomers: 2008La14 (no evidence found), 2007Ma57 (claimed evidence of presence of isomers)

Theory references: consult NSR database (www.nndc.bnl.gov/nsr/) for 64 primary references for calculations of half-lives of radioactive decays, and 23 for nuclear structure.

Q-value: Q(ε)=1520 60, S(2n)=14074 15, S(2p)=5503 13 (2021Wa16)










E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
     0.0ABC 0+ 122 ns 5 
% α = 100
     
   689.0 3  BC 2+     689.0 3 
  100
E2
     0.0
0+
  1078.0 6  BC (3-)     388.9 6 
  100
(D)
   689.0
2+
  1192.3 5  BC 4+     114.2 7 
  503.3 3 
    2.3 2 
  100.0 17 
(D)
E2
  1078.0
   689.0
(3-)
2+
  1560.8 6  BC 6+     368.5 3 
  100
E2
  1192.3
4+
  1761.7 7  BC 8+ 1.2 ns 2    200.9 4 
  100
E2
  1560.8
6+
  2099.5 9  BC 10+ 0.25 ns 15    337.8 5 
  100
E2
  1761.7
8+
  2272.6 10  BC (11-)     173.1 4 
  100
(E1)
  2099.5
10+
  2686.3 10  BC (13-)     413.7 4 
  100
(Q)
  2272.6
(11-)
  3160.0 12  B  (15-)     473.7 5 
  100
(Q)
  2686.3
(13-)
  3306.7 13  B  (16+)     146.7 5 
  100
(E1)
  3160.0
(15-)

E(level): From Eγ data

Jπ(level): In addition to the arguments given, the assignments are supported from shell-model calculations in 2020Od01

E(γ): From 174Yb(48Ca,4nγ). Values in 206Pb(16O,4nγ), 209Bi(14N,5nγ), listed under comments, seem consistently higher by about a keV

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Band Transitions:

E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 1 - Yrast (g.s.) band
     0.0 0+ 122 ns 5 
% α = 100
     
   689.0 3  2+     689.0 3 
  100
E2
     0.0
0+
  1192.3 5  4+     114.2 7 
  503.3 3 
    2.3 2 
  100.0 17 
(D)
E2
  1078.0
   689.0
(3-)
2+
  1560.8 6  6+     368.5 3 
  100
E2
  1192.3
4+
  1761.7 7  8+ 1.2 ns 2    200.9 4 
  100
E2
  1560.8
6+
  2099.5 9  10+ 0.25 ns 15    337.8 5 
  100
E2
  1761.7
8+
E(level)
(keV)
Jπ(level) T1/2(level)E(γ)I(γ)M(γ)Final Levels
Band 2 - Band based on (11-)
  2272.6 10  (11-)        
  2686.3 10  (13-)     413.7 4 
  100
(Q)
  2272.6
(11-)
  3160.0 12  (15-)     473.7 5 
  100
(Q)
  2686.3
(13-)

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Additional Gamma Data:













E(level)
(keV)
Jπ(level)T1/2(level)E(γ)
(keV)
MultipolarityConversion
Coefficient
Additional Data
   689.0 2+     689.0 3 E20.0209α=0.0209
  1192.3 4+     503.3 3 E20.0420α=0.0420
  1560.8 6+     368.5 3 E20.093α=0.093
  1761.7 8+ 1.2 ns 2    200.9 4 E20.648B(E2)(W.u.)=11 2, α=0.648 11
  2099.5 10+ 0.25 ns 15    337.8 5 E20.1187B(E2)(W.u.)=6 +9-2, α=0.1187
  2272.6 (11-)     173.1 4 (E1)0.133α=0.133 2
  3306.7 (16+)     146.7 5 (E1)0.197α=0.197 4

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.00+ 122 ns 5 
% α = 100
Configuration=π(h9/26f7/22)#νg9/22 with 14% probability (2020Od01).
E(level): Yrast (g.s.) band.
   689.02+   Configuration=π(h9/26f7/22)#νg9/22 with 25% probability (2020Od01).
E(level): Yrast (g.s.) band.
  1078.0(3-)   XREF: C(?).
  1192.34+   Configuration=π(h9/26f7/22)#νg9/22 with 28% probability (2020Od01).
E(level): Yrast (g.s.) band.
  1560.86+   Configuration=π(h9/26f7/22)#νg9/22 with 28% probability (2020Od01).
E(level): Yrast (g.s.) band.
  1761.78+ 1.2 ns 2  Configuration=π(h9/26f7/22)#νg9/22 with 28% probability (2020Od01).
E(level): Yrast (g.s.) band.
  2099.510+ 0.25 ns 15  Configuration=π(h9/26f7/22)#ν(i11/21g9/21 with 26% probability (2020Od01).
E(level): Yrast (g.s.) band.
  2272.6(11-)   XREF: C(?).
E(level): Band based on (11-).
  2686.3(13-)   XREF: C(?).
E(level): Band based on (11-).
  3160.0(15-)   Configuration=π(h9/26i13/22)#ν(g9/21j15/21) with 37% probability (2020Od01).
E(level): Band based on (11-).
  3306.7(16+)   Configuration=π(h9/27f7/21)#νg9/22 with 42% probability (2020Od01).

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Additional Gamma Comments:

E(level)E(gamma)Comments
   689.0   689.0E(γ): 689.6 6 in (16O,4nγ)
M(γ): From K/L ratios in ce data in 209Bi(14N,5nγ), supplemented by ΔJ=2, quadrupole from γ-ray angular distributions in 174Yb(48Ca,4nγ), and by RUL for E2 and M2, when level half-lives are known
  1078.0   388.9E(γ): 390.5 10 in (16O,4nγ)
M(γ): From γ-ray angular distributions in 174Yb(48Ca,4nγ), with mult=(Q) and (d), most likely (E2) and (E1), respectively.
  1192.3   114.2E(γ): from (48Ca,4nγ) only
M(γ): From γ-ray angular distributions in 174Yb(48Ca,4nγ), with mult=(Q) and (d), most likely (E2) and (E1), respectively.
   503.3E(γ): 504.6 6 in (16O,4nγ)
M(γ): From K/L ratios in ce data in 209Bi(14N,5nγ), supplemented by ΔJ=2, quadrupole from γ-ray angular distributions in 174Yb(48Ca,4nγ), and by RUL for E2 and M2, when level half-lives are known
  1560.8   368.5E(γ): 369.7 6 in (16O,4nγ)
M(γ): From K/L ratios in ce data in 209Bi(14N,5nγ), supplemented by ΔJ=2, quadrupole from γ-ray angular distributions in 174Yb(48Ca,4nγ), and by RUL for E2 and M2, when level half-lives are known
  1761.7   200.9E(γ): 201.9 6 in (16O,4nγ)
M(γ): From K/L ratios in ce data in 209Bi(14N,5nγ), supplemented by ΔJ=2, quadrupole from γ-ray angular distributions in 174Yb(48Ca,4nγ), and by RUL for E2 and M2, when level half-lives are known
  2099.5   337.8E(γ): 338.2 6 in (16O,4nγ)
M(γ): From K/L ratios in ce data in 209Bi(14N,5nγ), supplemented by ΔJ=2, quadrupole from γ-ray angular distributions in 174Yb(48Ca,4nγ), and by RUL for E2 and M2, when level half-lives are known
  2272.6   173.1E(γ): 173.3 6 in (16O,4nγ)
M(γ): From γ-ray angular distribution in 174Yb(48Ca,4nγ), and intensity balance arguments
  2686.3   413.7E(γ): 414.5 10 in (16O,4nγ)
M(γ): From γ-ray angular distributions in 174Yb(48Ca,4nγ), with mult=(Q) and (d), most likely (E2) and (E1), respectively.
  3160.0   473.7E(γ): from (48Ca,nγ) only
M(γ): From γ-ray angular distributions in 174Yb(48Ca,4nγ), with mult=(Q) and (d), most likely (E2) and (E1), respectively.
  3306.7   146.7E(γ): from (48Ca,nγ). An unplaced 146.9 6 γ was seen in (16O,4nγ)
M(γ): From γ-ray angular distribution in 174Yb(48Ca,4nγ), and intensity balance arguments

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