ADOPTED LEVELS, GAMMAS for 81As

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-)=3856 keV 3S(n)= 8390 keV 5S(p)= 10287 keV 4Q(α)= -8966 keV 4
Reference: 2012WA38

References:
  A  81Ge β- decay (7.6 S): (1/2+)  B  82Se(t,α)
  C  82Se(d,3He)  D  81Ge β- decay (7.6 S): (9/2+)

General Comments:

Other Reactions:

238U(82Se,X), E=505 MeV (2005Lu07); measured γ spectrum from 81As reaction product (no details given).

82Se(μ,νnγ) (2008Zi03, 2006Eg04); measured muon lifetime and capture rate for 82Se; observed 336γ from 81As.

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

Q-value: S(p) from mass data for 81As and 80Ge (2008Ha23); S(p)=10307 29 from 2003Au03.










E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
      0ABCD 3/2- 33.3 s 8 
% β- = 100
     
     93.10 5 A CD 1/2-,3/2-,5/2-       93.10 10 
  100
M1+E2
      0
3/2-
    290.40 4 ABCD (3/2)-      197.30 5 
   290.35 5 
  100 7 
   52 5 
(M1)

     93.10
      0
1/2-,3/2-,5/2-
3/2-
    335.96 4 ABCD (5/2)- < 0.7 ns    242.84 9 
   335.98 5 
    4.1 5 
  100 4 

M1,E2
     93.10
      0
1/2-,3/2-,5/2-
3/2-
    737.72 4 ABCD (5/2-)      401.75 5 
   737.74 5 
   35 3 
  100 6 


    335.96
      0
(5/2)-
3/2-
    757 9  B   7/2+,9/2+        
    758.42 7 AB D (3/2+,5/2-)      467.98 6 
   665.9 3 
   758.5 6 
   46 13 
   38
  100 9 



    290.40
     93.10
      0
(3/2)-
1/2-,3/2-,5/2-
3/2-
    864.27 15 A         771.26 15 
  100

     93.10
1/2-,3/2-,5/2-
   1015 4  BC  1/2-,3/2-        
   1042.00 7 AB D (7/2-)      706.07 10 
   751.51 10 
   90 7 
  100 7 


    335.96
    290.40
(5/2)-
(3/2)-
   1083.39 9    D (3/2+,5/2,7/2-)      747.41 10 
   793.0
   990.3 4 
  1083.2 3 
  100 7 
   68
   19 10 
   39 10 




    335.96
    290.40
     93.10
      0
(5/2)-
(3/2)-
1/2-,3/2-,5/2-
3/2-
   1128.98 8  B D (7/2,9/2-)      391.34 11 
   792.94 6 
    6.9 6 
  100


    737.72
    335.96
(5/2-)
(5/2)-
   1195.04 9    D      859.13 10 
  100

    335.96
(5/2)-
   1496 5  BC  1/2-,3/2-        
   1613.55 10    D      875.84 10 
  100

    737.72
(5/2-)
   1614 4 ? BC  1/2+        
   1672 4  BC  (5/2-,7/2-)        
   1870.0 4 A    (1/2,3/2)     1005.7 3 
  1869.8
   53 13 
  100


    864.27
      0

3/2-
E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
   1879 8  B   7/2+,9/2+        
   1914.95 15    D (7/2,9/2-)     1156.41 15 
  100

    758.42
(3/2+,5/2-)
   2077 13  B   (-)        
   2142.10 10    D (7/2+,9/2+)     1013.0 2 
  1058.6 2 
  1100.3 2 
  100 8 
   38.1 22 
   24 3 



   1128.98
   1083.39
   1042.00
(7/2,9/2-)
(3/2+,5/2,7/2-)
(7/2-)
   2250.87 23    D      637.3 3 
  100

   1613.55

  ≈2518? B          
   2624.53 7    D (7/2+)      482.4 1 
   709.1 3 
  1429.53 10 
  1495.53 5 
  1582.27 15 
  1886.8 2 
   39 4 
   23 5 
   40.4 21 
  100 3 
   31.8 21 
    5.7 7 






   2142.10
   1914.95
   1195.04
   1128.98
   1042.00
    737.72
(7/2+,9/2+)
(7/2,9/2-)

(7/2,9/2-)
(7/2-)
(5/2-)
   2723 9  B   1/2-,3/2-        
   2758.28 9    D (7/2+,9/2+,11/2+)      133.70 6 
   507.4 3 
   616.3 2 
  1144.75 15 
  1629.45 13 
   54 3 
   17 4 
   23 4 
  100 7 
   57 4 





   2624.53
   2250.87
   2142.10
   1613.55
   1128.98
(7/2+)

(7/2+,9/2+)

(7/2,9/2-)
   2862.47 17 A    (1/2-,3/2)     2103.9 3 
  2526.5 2 
   69 10 
  100 10 


    758.42
    335.96
(3/2+,5/2-)
(5/2)-
   2912.07 16 A    (3/2-)     1869.8
  2174.32 15 
   23.3
  100 7 


   1042.00
    737.72
(7/2-)
(5/2-)
   2965.92 10    D (7/2+)     1352.3
  1882.51 8 
  2207.5 3 
  2228.2 5 
  2629.9 2 
    5.4
  100 4 
   16.3 22 
   10.9 22 
   32 3 





   1613.55
   1083.39
    758.42
    737.72
    335.96

(3/2+,5/2,7/2-)
(3/2+,5/2-)
(5/2-)
(5/2)-
   2999 3  B   1/2-,3/2-        
E(level)
(keV)
XREFJπ(level) T1/2(level)E(γ)
(keV)
I(γ)M(γ)Final Levels
   3098 6  B   5/2-,7/2-        
   3136.27 13 A    (3/2+)     2377.4 4 
  2800.2 2 
  2845.8 2 
  3136.6 3 
   60 18 
  100 11 
   49 7 
   29 5 




    758.42
    335.96
    290.40
      0
(3/2+,5/2-)
(5/2)-
(3/2)-
3/2-
   3195.44 19 A    (3/2+)     2331.3 2 
  2436.6
  2859.1
  2904.7 3 
  3195.1
   85 9 
  ≈18.9
  ≈18.9
   35 6 
  100





    864.27
    758.42
    335.96
    290.40
      0

(3/2+,5/2-)
(5/2)-
(3/2)-
3/2-
   3290.4   D (7/2+,9/2+,11/2+)      665.9
  100

   2624.53
(7/2+)
   3306 9  B          
   3368.4 3 A    (1/2,3/2)      456.3 2 
  100

   2912.07
(3/2-)
   3480 7  B   1/2+        
   3531.1 10 A    (1/2-,3/2)     3195.1
  100

    335.96
(5/2)-
   3562.73 15 A    (1/2+,3/2+)     3469.5 2 
  3562.7 2 
   54 6 
  100 7 


     93.10
      0
1/2-,3/2-,5/2-
3/2-
   3596 12  B   1/2+        
   3742 9  B          
   3818 12  B   1/2-,3/2-        
   3914 8  B   (1/2+,5/2-,7/2-)        
   3995 7  B   (1/2+,5/2-,7/2-)        

E(level): From least-squares fit to Eγ for levels deexcited by γ rays; from (t,α) for levels excited only in that reaction and weighted average from (t,α) and (d,3He) for levels excited in those two reactions only.

Jπ(level): Note that many Jπ values are based on log ft values for β- decay from high and low spin isomers of 81Ge whose lifetimes are indistinguishable; the relevant decay schemes are highly tentative, and the deduced Jπ should be accepted with caution. The evaluator notes cases where inconsistent Jπ is implied by log ft and L(t,α) (defined only by 4-6 data points) for levels at similar energies.

I(γ): From 81Ge β- decay; Iγ data are taken from 1980HoZN for source containing both high and low spin isomers.

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Additional Gamma Data:















E(level)
(keV)
Jπ(level)T1/2(level)E(γ)
(keV)
MultipolarityMixing
Ratio
Conversion
Coefficient
Additional Data
     93.10 1/2-,3/2-,5/2-       93.10 10 M1+E20.24 60.16α=0.16 3
    290.40 (3/2)-      197.30 5 (M1) 0.01490α=0.01490
    335.96 (5/2)- < 0.7 ns    335.98 5 M1,E2 0.007α=0.007 3

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Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
   1128.98(7/2,9/2-)   E(level): Doublet in (t,α).
   2077(-)   E(level): Doublet in (t,α).
   3306   E(level): Doublet in (t,α).
   35961/2+   E(level): Doublet in (t,α).

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Additional Gamma Comments:

E(level)E(gamma)Comments
    290.40    197.30E(γ): Doublet in (t,α).
I(γ): From 81Ge β- decay (7.6 s): (9/2+). Data from 81Ge β- decay (7.6 s): (1/2+) are consistent.
    290.35E(γ): Doublet in (t,α).
I(γ): From 81Ge β- decay (7.6 s): (9/2+). Data from 81Ge β- decay (7.6 s): (1/2+) are consistent.
    335.96    242.84E(γ): Doublet in (t,α).
I(γ): From 81Ge β- decay (7.6 s): (9/2+). Data from 81Ge β- decay (7.6 s): (1/2+) are consistent.
    335.98E(γ): Doublet in (t,α).
I(γ): From 81Ge β- decay (7.6 s): (9/2+). Data from 81Ge β- decay (7.6 s): (1/2+) are consistent.
    737.72    401.75E(γ): Doublet in (t,α).
I(γ): From 81Ge β- decay (7.6 s): (9/2+). Data from 81Ge β- decay (7.6 s): (1/2+) are consistent.
    737.74E(γ): Doublet in (t,α).
I(γ): From 81Ge β- decay (7.6 s): (9/2+). Data from 81Ge β- decay (7.6 s): (1/2+) are consistent.
    758.42    467.98E(γ): Doublet in (t,α).
I(γ): From 81Ge β- decay (7.6 s): (9/2+). Data from 81Ge β- decay (7.6 s): (1/2+) are consistent.
    665.9E(γ): Doublet in (t,α).
I(γ): From 81Ge β- decay (7.6 s): (9/2+). Data from 81Ge β- decay (7.6 s): (1/2+) are consistent.
    758.5E(γ): Doublet in (t,α).
I(γ): From 81Ge β- decay (7.6 s): (9/2+). Data from 81Ge β- decay (7.6 s): (1/2+) are consistent.
   1042.00    706.07E(γ): Doublet in (t,α).
I(γ): From 81Ge β- decay (7.6 s): (9/2+). Data from 81Ge β- decay (7.6 s): (1/2+) are consistent.
    751.51E(γ): Doublet in (t,α).
I(γ): From 81Ge β- decay (7.6 s): (9/2+). Data from 81Ge β- decay (7.6 s): (1/2+) are consistent.
   1870.0   1869.8E(γ): Multiply placed with intensity suitably divided
I(γ): Multiply placed with intensity suitably divided
   2912.07   1869.8E(γ): Multiply placed with intensity suitably divided
I(γ): Multiply placed with intensity suitably divided
   3195.44   3195.1E(γ): Multiply placed with intensity suitably divided
I(γ): Multiply placed with intensity suitably divided
   3531.1   3195.1E(γ): Multiply placed with intensity suitably divided
I(γ): Multiply placed with intensity suitably divided

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