ADOPTED LEVELS, GAMMAS for 81Se

Author: Coral M. Baglin |  Citation: Nucl. Data Sheets 109, 2257 (2008) |  Cutoff date: 15-Aug-2008 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=1586.6 keV 17S(n)= 6700.9 keV 4S(p)= 11464 keV 4Q(α)= -7601.1 keV 13
Reference: 2012WA38

References:
  A  80Se(pol d,p), (d,p)  B  80Se(n,γ) E=THERMAL
  C  82Se(p,d)  D  81As β- decay
  E  80Se(n,γ) E=RES  F  82Se(d,t)
  G  81Se IT decay (57.28 M) 

General Comments:

Other Reactions:

d(80Se,pγ), E(80Se)≈320 MeV (2007Ci05); investigated feasibility of measuring γ-rays in coincidence with (d,p) reaction protons in inverse kinematics using Cd2 targets; observed 765γ-468γ cascade and 1233γ from 1233 level.

Theory: 1973IkZU, 1974Ku09, 1975He19, 1976Ca16.

Q-value: Note: Current evaluation has used the following Q record 1585.3 226700.9 411519 23-7600.4 17 2003Au03

Q-value: α recent mass measurement for the 81Se 103.0-keV isomer implies an 81Se(g.s.) mass excess of -76386.1 26 cf. -76389.5 20 from 2003Au03 (2007Bo50).










E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
     0ABCDEFG 1/2- 18.45 m 12 
% β- = 100
     
   103.00 6 ABCD  G 7/2+ 57.28 m 2 
% IT = 99.949 14
% β- = 0.051 14
   103.01 6 
   100
E3(+M4)
     0
1/2-
   294.30 17 ABC  F  9/2+      191.05 20 
   100

   103.00
7/2+
   467.74 8 ABCDEF  3/2-      467.72 10 
   100

     0
1/2-
   491.06 9  BCD F  (5/2)-      388.19 17 
   491.20 14 
    10.1 12 
   100.0 12 

(E2)
   103.00
     0
7/2+
1/2-
   615.8 4 ? B           126.0 10 ?
   148.0 10 ?
 
 


   491.06
   467.74
(5/2)-
3/2-
   624.11 11 ABCD F  5/2-      156.12 18 
   521.10 14 
    20.3 29 
   100 9 
[M1,E2]

   467.74
   103.00
3/2-
7/2+
   782 25   C     7/2+,9/2+        
   889.43 20  B      (3/2+,5/2,7/2+)      264.8 3 
   399.8 6 
   786.4 4 
   889.0 10 ?
    23 6 
   ≤26
    80 21 
   100




   624.11
   491.06
   103.00
     0
5/2-
(5/2)-
7/2+
1/2-
  1052.75 14 ABCD F  5/2+      757.6 3 
   949.7 2 
    38 8 
   100 12 


   294.30
   103.00
9/2+
7/2+
  1109 25   C     3/2+,5/2+        
  1232.77 19 AB      1/2+      765.04 20 
  1232.7 4 
   100 8 
   ≤25


   467.74
     0
3/2-
1/2-
  1303.46 15 ABCD F  5/2+      812.5 6 
   835.92 18 
  1201.0 10 
   ≤29
   100 10 
    36 27 



   491.06
   467.74
   103.00
(5/2)-
3/2-
7/2+
  1406.33 14 ABCD F  3/2-      915.04 19 
   938.84 17 
  1406.14 28 
     9.5 17 
    29 3 
   100.0 12 



   491.06
   467.74
     0
(5/2)-
3/2-
1/2-
  1628 25   C     1/2-,3/2-        
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
  1702.59 25 AB      3/2+      399.8 6 
   649.5 5 
   812.5 6 
  1087.2 4 
  1210.8 10 
  1599.5 5 
  1702.2 10 
   ≤26
    24 6 
   ≤46
   ≤43
   100 57 
    50 6 
    47 16 







  1303.46
  1052.75
   889.43
   615.8
   491.06
   103.00
     0
5/2+
5/2+
(3/2+,5/2,7/2+)

(5/2)-
7/2+
1/2-
  1711.25 21  B      (1/2,3/2,5/2-)     1087.2 4 
  1243.54 25 
  1711.0 6 
   ≤45
   100 9 
    83 12 



   624.11
   467.74
     0
5/2-
3/2-
1/2-
  1724.89 15  BC E   (3/2)+      491.33?
   672.19 25 
  1232.7 4 
  1257.14 20 
  1725.4 3 
   ≤10
    ≤9.5
    ≤6.6
    18.8 15 
   100 8 





  1232.77
  1052.75
   491.06
   467.74
     0
1/2+
5/2+
(5/2)-
3/2-
1/2-
  1812 25   C     7/2+,9/2+        
  1828.1 3 AB      3/2+      938.7 3 
  1360.7 10 
  1828.1 4 
   ≤10
    62 13 
   100 13 



   889.43
   467.74
     0
(3/2+,5/2,7/2+)
3/2-
1/2-
  2029.64 15 A CD    1/2-,3/2-     1561.9 2 
  2029.6 2 
   100 11 
    60 5 


   467.74
     0
3/2-
1/2-
  2150 25   C     1/2-,3/2-        
  2173.9 5 ABC         1549.4 7 
  1706.6 7 
    58 10 
   100 12 


   624.11
   467.74
5/2-
3/2-
  2179.33 17 A CD        1688.4 2 
   100

   491.06
(5/2)-
  2253.02 23  B      (5/2+)      949.65 25 
  1627.1 10 
  1636.2 8 
  1784.8 8 
  1959.5 5 
  2149.6 8 
  ≤156
    31 6 
    42 8 
   100 27 
    47 8 
   ≤45






  1303.46
   624.11
   615.8
   467.74
   294.30
   103.00
5/2+
5/2-

3/2-
9/2+
7/2+
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
  2282 25   C     1/2-,3/2-        
  2332.73 14 ABCD    5/2+     1842.07 19 
  1864.7 4 
  2332.3 2 ?
    56 7 
   100 7 
    58 9 



   491.06
   467.74
     0
(5/2)-
3/2-
1/2-
  2383.4 3  B      (5/2-,7/2,9/2-)      672.19 25 
  1892.0 8 
  ≤233
   100 21 


  1711.25
   491.06
(1/2,3/2,5/2-)
(5/2)-
  2475 25   C            
  2532 6 A C     (5/2)+        
  2568.9 9  B      (1/2,3/2)     1162.0 10 
  2570.0 15 
    51 22 
   100 15 


  1406.33
     0
3/2-
1/2-
  2570.18 16    D    1/2-,3/2-,5/2-     2079.3 2 
  2102.2 2 
  2569.5 2 
    18.6 27 
   100 11 
    47 5 



   491.06
   467.74
     0
(5/2)-
3/2-
1/2-
  2596 6 A C     1/2-,3/2-        
  2659.65 20 A CD    5/2-     2659.60 20 
   100

     0
1/2-
  2734 6 A              
  2769.76 16   CD    (5/2)-     2145.8 2 
  2301.8 2 
    20 4 
   100 10 


   624.11
   467.74
5/2-
3/2-
  2773.7 5 ABC     5/2+     1367.2 10 
  1884.2 5 
  2149.6 8 
    66 10 
   100 12 
   <64



  1406.33
   889.43
   624.11
3/2-
(3/2+,5/2,7/2+)
5/2-
  2891 6 A C     (7/2+,9/2+)        
  2935.19 15   CD    (5/2)-      756.0 2 
  1882.0 2 
  2832.4 2 
    61 7 
    <3
   100 11 



  2179.33
  1052.75
   103.00

5/2+
7/2+
  2938 6 A       (1/2+)        
  2953.4 20  B      1/2,3/2,5/2+     2485.6 20 
   100

   467.74
3/2-
  2965.11 18   CD    (5/2)-     1661.8 2 
  2340.8 2 
   100 15 
    59 9 


  1303.46
   624.11
5/2+
5/2-
  2985 25   C            
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
  2986 6 A       (1/2+)        
  3053 6 A C     3/2+        
  3093 6 A              
  3150 25   C     (-)        
  3208 6 A              
  3222.7 16 ?A CD    (5/2)-     2733.3 2 ?
  3118.2 2 ?
   100 15 
    38 10 


   491.06
   103.00
(5/2)-
7/2+
  3287 6 A C            
  3308 6 A              
  3349 25   C     1/2-,3/2-        
  3379 6 A              
  3411 6 A              
  3435 6 A              
  3477 6 A              
  3525.7 12 AB      1/2,3/2,5/2+        
  3562 6 A              
  3682 6 A       3/2+        
  3774 6 A       3/2+,5/2+        
  3830 6 A       1/2+        
  3920?A       (1/2+)        
  3970?A       (1/2+)        
  4095 6 A              
  4137 6 A              
  4164 6 A              
  4215 6 A       (3/2+,5/2+)        
  4260 6 A       (3/2+,5/2+)        
  4437 6 A              
  4559 6 A              
  4656 6 A              
  4708 6 A              
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
  4845 6 A              
  4958 6 A              
  5080 6 A              
  5180?A              
  5330?A              

E(level): From least-squares fit to Eγ if ΔE<1 keV; from (p,d) if ΔE=25 keV; from (pol d,p) otherwise. Based on a comparison with E(level) derived from Eγ data for E(level)<3550, E(level) data from 1978Mo12 and 1960Ca16 in (d,p) are reliable to better than 6 keV (typically 0-2 keV), with the exception of the 635 level (which is 11 keV high). For E(level)>1400, E(level) values from (p,d) are 10-30 keV higher than those from (d,p). The evaluator, therefore, adopts E(level) from (d,p) in preference to E(level) from (p,d), and assigns ΔE=6 keV to those data because the authors do not state ΔE and only one energy deviates from adopted values by more than 6 keV. See also comment on ΔE in (p,d) data set.

Jπ(level): From (pol d,p), unless noted otherwise.

Back to top

Back to top

Additional Gamma Data:















E(level)
(keV)		Jπ(level)T1/2(level)E(γ)
(keV)		MultipolarityMixing
Ratio		Conversion
Coefficient		Additional Data
   103.00 7/2+ 57.28 m 2 
% IT = 99.949 14
% β- = 0.051 14
   103.01 6 E3(+M4)0.0057 LT6.79B(E3)(W.u.)=9.5E-4 3, B(M4)(W.u.)<30, α=6.79
   491.06 (5/2)-      491.20 14 (E2) 0.00291α=0.00291
   624.11 5/2-      156.12 18 [M1,E2] 0.09α=0.09 7

Back to top

Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
   103.007/2+ 57.28 m 2 
% IT = 99.949 14
% β- = 0.051 14
%IT, %β-: from 81Se IT decay (57.28 min).
E(level): %IT, %β-: from 81Se IT decay (57.28 min).
   624.115/2-   XREF: α(635).
  2029.641/2-,3/2-   XREF: α(2036)C(2056).
  2532(5/2)+   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  25961/2-,3/2-   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  2734   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  2769.76(5/2)-   XREF: C(2763).
E(level): Weighted average from (n,γ) E=thermal and β- decay.
Jπ(level): L(p,d)=(2+3) for 2763 25 state. Evaluator assumes this to be 2770+2774 doublet, in which case the L=(2) component would correspond to the 2774 level, leaving the L=(3) component to correspond to the 2770 level, thus favoring Jπ=5/2-,7/2- for it.
  2773.75/2+   XREF: C(2763).
  2891(7/2+,9/2+)   XREF: C(2893).
E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level). From 81As β- decay.
Jπ(level): L(p,d)=(3+4) for 2893 25 state. Evaluator assumes this to be 2891+2935 doublet, in which case the L=(3) component would correspond to the 2935 level leaving the L=(4) component to correspond to the 2891 level, favoring Jπ=7/2+,9/2+ for this level.
  2935.19(5/2)-   XREF: C(2893).
E(level): From 81As β- decay.
Jπ(level): L(p,d)=(3+4) for 2893 25 state. Evaluator assumes this to be 2891+2935 doublet, in which case the L=(3) component would correspond to the 2935 level leaving the L=(4) component to correspond to the 2891 level, favoring Jπ=7/2+,9/2+ for this level.
  2965.11(5/2)-   XREF: C(2985).
Jπ(level): L(p,d)=(3+4) for 2985 25 state. Evaluator assumes this to be a doublet, in which case the L=(3) component could correspond to the 2965 level leaving the L=(4) component to correspond to an E≈2986 level and favoring Jπ=7/2+,9/2+ for this level. The L(d,p)=(0) state at E=2986 is then presumed to be a different level.
  2985   XREF: C(2985).
E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
Jπ(level): L(p,d)=(3+4) for 2985 25 state. Evaluator assumes this to be a doublet, in which case the L=(3) component could correspond to the 2965 level leaving the L=(4) component to correspond to an E≈2986 level and favoring Jπ=7/2+,9/2+ for this level. The L(d,p)=(0) state at E=2986 is then presumed to be a different level.
  30533/2+   XREF: C(3087).
E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  3093   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  3208   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  3287   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  3308   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  3379   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  3411   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  3435   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  3477   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  3562   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  36823/2+   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  37743/2+,5/2+   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  38301/2+   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
E(level)Jπ(level)T1/2(level)Comments
  4095   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  4137   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  4164   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  4215(3/2+,5/2+)   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  4260(3/2+,5/2+)   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  4437   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  4559   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  4656   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  4708   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  4845   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  4958   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).
  5080   E(level): Weighted average from (n,γ) E=thermal and β- decay. Evaluator assigned ΔE. See also general comment on E(level).

Back to top

Additional Gamma Comments:

E(level)E(gamma)Comments
   491.06   388.19E(γ): Weighted average from (n,γ) E=thermal and β- decay.. Evaluator assigned ΔE. See also general comment on E(level).
I(γ): from β- decay.
M(γ): L|<2 from RUL and 40Ns coin resolving time in (n,γ) E=thermal. Mult.=M2 implies T1/2(491 level)>17 ns if B(M2)(W.u.)<1, so is unlikely. If T1/2(491 level)>40 ns, B(E2)(W.u.)<0.007 (also unlikely).
   491.20M(γ): d,E2 from RUL and 40Ns coin resolving time in (n,γ) E=thermal; ΔJ>1 from level scheme.
   624.11   156.12M(γ): M1,E2 expected for 5/2- to 3/2- transition.
   889.43   399.8E(γ): Multiply placed with undivided intensity
I(γ): Multiply placed with undivided intensity
  1052.75   949.7I(γ): for doublet in (n,γ) E=thermal; undivided Iγ given. Only this branch is reported in β- decay.
  1232.77  1232.7E(γ): Multiply placed with undivided intensity
I(γ): Multiply placed with undivided intensity
  1303.46   812.5E(γ): Multiply placed with undivided intensity
I(γ): Multiply placed with undivided intensity
   835.92E(γ): Weighted average from (n,γ) E=thermal and β- decay.. Evaluator assigned ΔE. See also general comment on E(level).
  1406.33   915.04E(γ): Weighted average from (n,γ) E=thermal and β- decay.
I(γ): Weighted average from (n,γ) E=thermal and β- decay.
   938.84E(γ): Weighted average from (n,γ) E=thermal and β- decay.
I(γ): Weighted average from (n,γ) E=thermal and β- decay.
  1406.14E(γ): Weighted average from (n,γ) E=thermal and β- decay.
I(γ): Weighted average from (n,γ) E=thermal and β- decay.
  1702.59   399.8E(γ): Multiply placed with undivided intensity
I(γ): Multiply placed with undivided intensity
   812.5E(γ): Multiply placed with undivided intensity
I(γ): Multiply placed with undivided intensity
  1087.2E(γ): Multiply placed with undivided intensity
I(γ): Multiply placed with undivided intensity
  1711.25  1087.2E(γ): Multiply placed with undivided intensity
I(γ): Multiply placed with undivided intensity
  1724.89   672.19E(γ): Multiply placed with undivided intensity
I(γ): Multiply placed with undivided intensity
  1232.7E(γ): Multiply placed with undivided intensity
I(γ): Multiply placed with undivided intensity
  2029.64  1561.9E(γ): From 81As β- decay.
I(γ): From 81As β- decay.
  2029.6E(γ): From 81As β- decay.
I(γ): From 81As β- decay.
  2179.33  1688.4E(γ): From 81As β- decay.
I(γ): From 81As β- decay.
  2253.02  2149.6E(γ): Multiply placed with undivided intensity
I(γ): Multiply placed with undivided intensity
  2332.73  1842.07E(γ): Weighted average from (n,γ) E=thermal and β- decay.
I(γ): Weighted average from (n,γ) E=thermal and β- decay.
  1864.7E(γ): Weighted average from (n,γ) E=thermal and β- decay.
I(γ): Weighted average from (n,γ) E=thermal and β- decay.
  2332.3E(γ): reported only in β- decay; placement inconsistent with Jπ from (pol d,p) unless mult=M2, so it is shown as uncertain here.. From 81As β- decay.
I(γ): From 81As β- decay.
  2383.4   672.19E(γ): Multiply placed with undivided intensity
I(γ): Multiply placed with undivided intensity
E(level)E(gamma)Comments
  2570.18  2079.3E(γ): From 81As β- decay.
I(γ): From 81As β- decay.
  2102.2E(γ): From 81As β- decay.
I(γ): From 81As β- decay.
  2569.5E(γ): could be same as 2570γ in (n,γ) E=thermal or could be doublet deexciting both 2569 and 2570 levels.. From 81As β- decay.
I(γ): From 81As β- decay.
  2659.65  2659.60E(γ): From 81As β- decay.
I(γ): From 81As β- decay.
  2769.76  2145.8E(γ): From 81As β- decay.
I(γ): From 81As β- decay.
  2301.8E(γ): From 81As β- decay.
I(γ): From 81As β- decay.
  2773.7  2149.6E(γ): Multiply placed with undivided intensity
I(γ): Multiply placed with undivided intensity
  2935.19   756.0E(γ): From 81As β- decay.
I(γ): From 81As β- decay.
  1882.0E(γ): From 81As β- decay.
I(γ): From 81As β- decay.
  2832.4E(γ): From 81As β- decay.
I(γ): From 81As β- decay.
  2965.11  1661.8E(γ): From 81As β- decay.
I(γ): From 81As β- decay.
  2340.8E(γ): From 81As β- decay.
I(γ): From 81As β- decay.
  3222.7  2733.3E(γ): From 81As β- decay.
I(γ): From 81As β- decay.
  3118.2E(γ): From 81As β- decay.
I(γ): From 81As β- decay.

Back to top