ADOPTED LEVELS, GAMMAS for 256Rf

Author: Balraj Singh |  Citation: Nucl. Data Sheets 141, 327 (2017) |  Cutoff date: 22-Mar-2017 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=-6280 keV SYS(n)= 8180 keV SYS(p)= 3014 keV 25Q(α)= 8926 keV 15
Reference: 2017WA10

References:
  A  260Sg α decay (4.95 MS)  B  208Pb(50Ti,2nγ)

General Comments:

Isotopic identification and assignment:

1975Og01: 208Pb(50Ti,2n) excitation function

1984Og02: 208Pb(50Ti,2n); 208Pb(49Ti,n) SF observed

1984Og02, 1985Mu11: daughter of 260Sg

1985He06: 208Pb(50Ti,2n),E=4.75-5.15 MeV/nucleon; 207Pb(50Ti,n),E=4.85 MeV/nucleon; parent of 252No (8410α)

1985So03: 249Cf(12C,5n),E=85 MeV, SF observed

Theoretical calculations: consult the Nuclear Science References (NSR) database for about 125 theory references.

2014Li15, 2012Jo05: nuclear structure theory references

Q-value: Estimated ΔQ(β-)=240, ΔS(n)=120 (2017Wa10)

Q-value: S(2n)=15120 280 (syst), S(2p)=5079 20, Q(εp)=126 23 (2017Wa10)










E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
      0.0AB 0+ 6.67 ms 10 
% α = 0.32 17
% SF = 99.68 17
     
     44 1 AB (2+)      44 1 S
  100
[E2]
      0.0
0+
    148 2  B (4+)     104 1 S
  100
[E2]
     44
(2+)
    309 2  B (6+)     161 1 
  100
[E2]
    148
(4+)
    527 2  B (8+)     218 1 
  100
[E2]
    309
(6+)
    799 2  B (10+)     272 1 
  100
[E2]
    527
(8+)
   ≈946 B (3-)     900 1 
 

     44
(2+)
  ≈1120 B (5-) 25 µs 2 
% IT = ?
% SF = ?
     
   1122 3  B (12+)     323 1 
  100
[E2]
    799
(10+)
  ≈1400 B (8-) 17 µs 2 
% IT = ?
% SF = ?
     
   1493 3  B (14+)     371 1 
  100
[E2]
   1122
(12+)
   1910 4  B (16+)     417 2 
  100

   1493
(14+)
  >2200 B 27 µs 5 
% IT = ?
% SF = ?
     
   2369 4  B (18+)     459 2 
  100

   1910
(16+)
   2868 5  B (20+)     499 2 
  100

   2369
(18+)

E(level): From Eγ data in 2012Gr12, unless otherwise stated

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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+ band.
      0.0 0+ 6.67 ms 10 
% α = 0.32 17
% SF = 99.68 17
     
     44 1  (2+)      44 1 S
  100
[E2]
      0.0
0+
    148 2  (4+)     104 1 S
  100
[E2]
     44
(2+)
    309 2  (6+)     161 1 
  100
[E2]
    148
(4+)
    527 2  (8+)     218 1 
  100
[E2]
    309
(6+)
    799 2  (10+)     272 1 
  100
[E2]
    527
(8+)
   1122 3  (12+)     323 1 
  100
[E2]
    799
(10+)
   1493 3  (14+)        
   1910 4  (16+)     417 2 
  100

   1493
(14+)
   2369 4  (18+)        
   2868 5  (20+)     499 2 
  100

   2369
(18+)

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Additional Gamma Data:













E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityConversion
Coefficient		Additional Data
     44 (2+)      44 1 [E2]1.83×103α=1.83×103 22, α(L)=1.30E3 16, α(M)=3.8E2 5, α(N)=111 14, α(O)=29 4, α(P)=4.9 6, α(Q)=0.0157 16
    148 (4+)     104 1 [E2]31.5α=31.5 15, α(L)=22.4 11, α(M)=6.6 4, α(N)=1.91 9, α(O)=0.502 24, α(P)=0.086 4, α(Q)=0.000476 20
    309 (6+)     161 1 [E2]4.51α=4.51 14, α(K)=0.093 3, α(L)=3.15 10, α(M)=0.92 3, α(N)=0.266 9, α(O)=0.0701 22, α(P)=0.0121 4, α(Q)=9.78×10-5 25
    527 (8+)     218 1 [E2]1.33α=1.33 3, α(K)=0.1204 17, α(L)=0.861 21, α(M)=0.249 6, α(N)=0.0721 18, α(O)=0.0190 5, α(P)=0.00334 8, α(Q)=3.68×10-5 8
    799 (10+)     272 1 [E2]0.589α=0.589 12, α(K)=0.1016 15, α(L)=0.349 8, α(M)=0.1003 21, α(N)=0.0290 6, α(O)=0.00767 16, α(P)=0.00136 3, α(Q)=1.93×10-5 4
   1122 (12+)     323 1 [E2]0.333α=0.333 6, α(K)=0.0832 12, α(L)=0.179 4, α(M)=0.0510 10, α(N)=0.0147 3, α(O)=0.00390 8, α(P)=0.000701 13, α(Q)=1.213×10-5 20
   1493 (14+)     371 1 [E2]0.218α=0.218 4, α(K)=0.0692 10, α(L)=0.1069 19, α(M)=0.0302 6, α(N)=0.00870 15, α(O)=0.00231 4, α(P)=0.000419 8, α(Q)=8.51×10-6 14

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
      0.00+ 6.67 ms 10 
% α = 0.32 17
% SF = 99.68 17
The α branching was determined by 1997He29 as (0.32|+0.17)%. Authors’ earlier measurement: (2.2 +7.3-1.8)% (1985He06).
E(level): The α branching was determined by 1997He29 as (0.32|+0.17)%. Authors’ earlier measurement: (2.2 +7.3-1.8)% (1985He06). Kπ=0+ band.
     44(2+)   E(level): Kπ=0+ band.
    148(4+)   E(level): Kπ=0+ band.
    309(6+)   E(level): Kπ=0+ band.
    527(8+)   E(level): Kπ=0+ band.
    799(10+)   E(level): Kπ=0+ band.
   1120(5-) 25 µs 2 
% IT = ?
% SF = ?
E(level): From 2009Je01. Level energy deduced from (electron)(900γ) coin. Half-life from recoil-electron-electron-electron-fission(t). Isomers at ≈1120 and ≈1400 keV interpreted by 2009Je01 as possible 2-qp states, while the one at >2000 keV is interpreted as possible 4-qp state. See also 2011Ro20 where only one isomer of 17 μs 5 was seen and interpreted as possible 4-qp state.
T1/2(level): From 2009Je01. Level energy deduced from (electron)(900γ) coin. Half-life from recoil-electron-electron-electron-fission(t). Isomers at ≈1120 and ≈1400 keV interpreted by 2009Je01 as possible 2-qp states, while the one at >2000 keV is interpreted as possible 4-qp state. See also 2011Ro20 where only one isomer of 17 μs 5 was seen and interpreted as possible 4-qp state.
   1122(12+)   E(level): Kπ=0+ band.
   1400(8-) 17 µs 2 
% IT = ?
% SF = ?
E(level): From 2009Je01. Level energy deduced from (electron)(900γ) coin. Half-life from recoil-electron-electron-electron-fission(t). Isomers at ≈1120 and ≈1400 keV interpreted by 2009Je01 as possible 2-qp states, while the one at >2000 keV is interpreted as possible 4-qp state. See also 2011Ro20 where only one isomer of 17 μs 5 was seen and interpreted as possible 4-qp state.
T1/2(level): From 2009Je01. Level energy deduced from (electron)(900γ) coin. Half-life from recoil-electron-electron-electron-fission(t). Isomers at ≈1120 and ≈1400 keV interpreted by 2009Je01 as possible 2-qp states, while the one at >2000 keV is interpreted as possible 4-qp state. See also 2011Ro20 where only one isomer of 17 μs 5 was seen and interpreted as possible 4-qp state.
   1493(14+)   E(level): Kπ=0+ band.
   1910(16+)   E(level): Kπ=0+ band.
   2200 27 µs 5 
% IT = ?
% SF = ?
Possible 4-qp state (2009Je01,2013Ri07).
E(level): From 2009Je01. Level energy deduced from (electron)(900γ) coin. Half-life from recoil-electron-electron-electron-fission(t). Isomers at ≈1120 and ≈1400 keV interpreted by 2009Je01 as possible 2-qp states, while the one at >2000 keV is interpreted as possible 4-qp state. See also 2011Ro20 where only one isomer of 17 μs 5 was seen and interpreted as possible 4-qp state.
T1/2(level): From 2009Je01. Level energy deduced from (electron)(900γ) coin. Half-life from recoil-electron-electron-electron-fission(t). Isomers at ≈1120 and ≈1400 keV interpreted by 2009Je01 as possible 2-qp states, while the one at >2000 keV is interpreted as possible 4-qp state. See also 2011Ro20 where only one isomer of 17 μs 5 was seen and interpreted as possible 4-qp state.
   2369(18+)   E(level): Kπ=0+ band.
   2868(20+)   E(level): Kπ=0+ band.

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Additional Gamma Comments:

E(level)E(gamma)Comments
     44     44E(γ): Calculated value from Harris fit in a rotational band
    148    104E(γ): Calculated value from Harris fit in a rotational band
    946    900E(γ): from 2009Je01

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