ADOPTED LEVELS, GAMMAS for 86Se

Author: Balraj Singh |  Citation: ENSDF |  Cutoff date: 31-JAN-2016 

Authors: Alexandru Negret, Balraj Singh |  Citation: Nucl. Data Sheets 124, 1 (2015) |  Cutoff date: 30-Nov-2014 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=5129 keV 4S(n)= 6161 keV 4S(p)= 14603 keV 4Q(α)= -7513 keV 3
Reference: 2012WA38

References:
  A  86As β- decay (0.945 S)  B  87As β-n decay (484 MS)
  C  248Cm,252Cf SF decay  D  238U(p,F):PROMPT γ
  E  238U(82Se,86SeG) 

General Comments:

86Se nuclide first produced by 1960Sa05 who assigned a 16S activity incorrectly to 87Se. Confirmed identification is from the work of 1973Ta19, and later studies 1974KrZG, 1975Hu02 and 1978Ze02

Precise mass measurements: 2008Ha23, 2008Su19

α few additional preliminary (or tentative) levels and gamma rays are given in 2015Ma25 from 86As β- decay; these are listed in the decay dataset, but not adopted here

Q-value: S(2n)=10698 3, S(2p)=26933 4 (2012Wa38)










E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
     0.0ABCDE 0+ 14.3 s 3 
% β- = 100
     
   704.30 5 ABCDE 2+ 7.5 ps +48-26     704.29 5 
  100
E2
     0.0
0+
  1398.94 7 AB  E (2+)      694.65 5 
  1399.1 2 
  100 8 
   46 8 


   704.30
     0.0
2+
0+
  1567.71 12 ABCDE 4+ ≤ 9.2 ps    863.4 1 
  100
E2
   704.30
2+
  2072.81 23 A CD  (4+)      505.1 2 
   674.2 3 ?
  100 33 
   17 10 


  1567.71
  1398.94
4+
(2+)
  2180.64 11 A     (2,3,4+)      782.2 2 
  1476.2 1 
   23 8 
  100 25 


  1398.94
   704.30
(2+)
2+
  2208.31 11 A     (2+)     1504.0 1 
  2208 1 
  100 13 
    3.8 25 


   704.30
     0.0
2+
0+
  2372.27 9 A     (2,3,4+)      973.3 1 
  1668.0 1 
   19 6 
  100 9 


  1398.94
   704.30
(2+)
2+
  2846.1 4   CD  (6+)     1278.4 3 
  100

  1567.71
4+
  3033 1   CD  (4,5,6+)     1465
 

  1567.71
4+
  3062.3 6   CD  (4,5,6+)      989.5 5 
  1495.1 5 
  100 50 
   50 25 


  2072.81
  1567.71
(4+)
4+
  3302.0 6   CD  (6,7,8+)      456.0 4 
  100

  2846.1
(6+)
  4089.5 10    D      1027.2
 

  3062.3
(4,5,6+)
  4097.7 10    D  (6,7,8+)     1251.6
 

  2846.1
(6+)
  4236.95 14 A     (2,3,4+)     1864.8 2 
  2028.7 3 
  3532.4 2 
   25 8 
   17 8 
  100 17 



  2372.27
  2208.31
   704.30
(2,3,4+)
(2+)
2+
  4783.21 21 A     (2,3,4+)     3384.2 2 
  100

  1398.94
(2+)
  5103.5 14    D      1014.0
 

  4089.5

E(level): From least-squares fit to Eγ values

Jπ(level): Systematics of neighboring isotones and the population and decay branches (2013Cz02), and shell-model calculations (2015Ma51)

M(γ): From γγ(θ) (2013Cz02) and in-band transitions and RUL

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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 band
     0.0 0+ 14.3 s 3 
% β- = 100
     
   704.30 5  2+ 7.5 ps +48-26     704.29 5 
  100
E2
     0.0
0+
  1567.71 12  4+ ≤ 9.2 ps    863.4 1 
  100
E2
   704.30
2+
  2846.1 4  (6+)     1278.4 3 
  100

  1567.71
4+

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Additional Gamma Data:











E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityAdditional Data
   704.30 2+ 7.5 ps +48-26     704.29 5 E2B(E2)(W.u.)=19 +12-8
  1567.71 4+ ≤ 9.2 ps    863.4 1 E2B(E2)(W.u.)≥5.7

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
     0.00+ 14.3 s 3 
% β- = 100
E(level): Yrast band.
   704.302+ 7.5 ps +48-26  E(level): Yrast band.
Jπ(level): Assigned Jπ supported by shell-model calculations (2015Ma51).
T1/2(level): From RDDS, plunger method (2015Li42) in (82Se,86Seγ).
  1567.714+ ≤ 9.2 ps E(level): Yrast band.
Jπ(level): Assigned Jπ supported by shell-model calculations (2015Ma51).
T1/2(level): From RDDS, plunger method (2015Li42) in (82Se,86Seγ).
  2846.1(6+)   E(level): Yrast band.
  3033(4,5,6+)   Jπ(level): Jπ=2+,3 not likely from yrast pattern of population in high-spin study.
  3062.3(4,5,6+)   Jπ(level): Jπ=2+,3 not likely from yrast pattern of population in high-spin study.
  3302.0(6,7,8+)   Jπ(level): Jπ=2+,3 not likely from yrast pattern of population in high-spin study.
  4097.7(6,7,8+)   Jπ(level): Jπ=2+,3 not likely from yrast pattern of population in high-spin study.

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Additional Gamma Comments:

E(level)E(gamma)Comments
  2072.81   674.2E(γ): γ seen only in β- decay

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