ADOPTED LEVELS, GAMMAS for 86Br

Authors: A. Negret and B. Singh |  Citation: Nucl. Data Sheets 203, 283 (2025) |  Cutoff date: 20-Jan-2025 

 Full ENSDF file | Adopted Levels (PDF version) 


Q(β-)=7633 keV 3S(n)= 5128 keV 4S(p)= 10508 keV 4Q(α)= -7952 keV 5
Reference: 2021WA16

References:
  A  86Se β- decay (14.3 S)  B  87Se β-n decay (5.65 S)
  C  86Kr(t,3HeG)  D  208Pb(18O,Fγ)
  E  235U(n,Fγ) 

General Comments:

86Br nuclide first produced in decay of 86Se by 1960Sa05 who assigned a 16S activity incorrectly to 87Se decay, instead of correct assignment of 86Se to 86Br. Confirmed identification is from the work of 1962St13, and several later studies.

α 4.5 s 10 (possible isomeric) activity was assigned to 86Br by 1970Lu06 from the decay pattern of 1564γ in 86Kr, but the existence of this activity remains unconfirmed.

Precise mass measurement using Penning-trap spectrometer: 2007Ra23

2016Ur04: calculated levels, Jπ, occupation of neutron and proton orbitals using large-scale shell-model with the coupled-scheme code NATHAN, in valence space outside the inert 78Ni core: π1f5/2, π2p3/2, π2p1/2, and π1g9/2 proton orbitals; and ν2d5/2, ν3s1/2, ν1g7/2, ν2d3/2, and ν1h11/2 neutron orbitals.

DICT$ 86Kr(t,3Heγ)=86Kr(t,3Heγ)

Q-value: S(2n)=13992 26, S(2p)=24357 4 (2021Wa16)










E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
      0.0A  DE 1- 55.1 s 5 
% β- = 100
     
      4.37 3 A  DE (2-)        4.37 3 S
 
(M1)
      0.0
1-
     53.076 29 A  DE (3-)       48.71 5 
    53.1?
  100 8 
   <0.10
M1(+E2)
[E2]
      4.37
      0.0
(2-)
1-
    130.89 5 A CDE (4-)       77.80 5 
  100
M1+E2
     53.076
(3-)
    207.019 25 A     (2-)      153.91 5 
   202.66 5 
   207.04 5 
   45.0 15 
    2.8 8 
  100 4 
E2+M1
[M1+E2]
[M1+E2]
     53.076
      4.37
      0.0
(3-)
(2-)
1-
    244.02 6 A CDE (4-)      190.94 6 
  100
(D)
     53.076
(3-)
    297.857 33 A     (3-)       53.7 2 
    90.90 7 
   166.96 5 
   244.75 9 
   293.51 5 
    1.3 7 
   10.3 13 
   59.0 19 
    9.6 13 
  100 5 
[M1+E2]
[M1+E2]
E2+M1
[M1+E2]
[M1+E2]
    244.02
    207.019
    130.89
     53.076
      4.37
(4-)
(2-)
(4-)
(3-)
(2-)
    435.178 26 A     (2-)      137.35 8 
   228.20 5 
   382.10 5 
   430.81 5 
   435.15 5 
    2.0 4 
   30.5 13 
  100 4 
   16.6 9 
    8.9 17 
[M1+E2]
[M1+E2]



    297.857
    207.019
     53.076
      4.37
      0.0
(3-)
(2-)
(3-)
(2-)
1-
    569.777 30 A     (1-,2-)      271.92 5 
   362.70 7 
   516.70 5 
   565.40 7 
   569.80 7 
  100 5 
   16.0 13 
   57.1 26 
   19.2 13 
   19.9 13 





    297.857
    207.019
     53.076
      4.37
      0.0
(3-)
(2-)
(3-)
(2-)
1-
    575.62 8    DE (5-)      331.61 9 
   444.78 15 
  100 8 
   25 4 
(D)

    244.02
    130.89
(4-)
(4-)
    785.583 35 A     (0-)      785.55 5 
  100

      0.0
1-
    809.185 29 A     (0-,1,2-)      374.05 5 
   602.12 5 
   804.80 5 
   809.15 5 
   17 6 
   21 4 
   89 7 
  100 7 




    435.178
    207.019
      4.37
      0.0
(2-)
(2-)
(2-)
1-
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
   ≈900  C          
    935.083 32 A     (0-,1,2)      728.07 6 
   930.65 5 
   935.02 6 
   25 5 
  100 25 
   40 5 



    207.019
      4.37
      0.0
(2-)
(2-)
1-
   1047.261 30 A     (2-)      477.44 8 
   612.10 8 
   749.50 9 
   840.20 5 
   994.18 5 
  1042.91 7 
  1047.41 9 
    6.0 10 
    8.5 15 
   34.7 15 
   15.1 15 
  100.0 45 
   22.6 15 
   21.1 15 







    569.777
    435.178
    297.857
    207.019
     53.076
      4.37
      0.0
(1-,2-)
(2-)
(3-)
(2-)
(3-)
(2-)
1-
   1329.382 33 A     (1-)      759.72 6 
   894.19 6 
  1031.30 9 
  1122.20 7 
  1276.33 5 
  1325.00 7 
   28.6 21 
   35.7 31 
   21.4 31 
   19.4 31 
  100 4 
    8.2 21 






    569.777
    435.178
    297.857
    207.019
     53.076
      4.37
(1-,2-)
(2-)
(3-)
(2-)
(3-)
(2-)
   1488.66 7 A     (0-,1,2,3+)     1053.3 1 
  1281.7 1 
   91 18 
  100 18 


    435.178
    207.019
(2-)
(2-)
   1495.02 27    D  (6-)      919.5 4 
  1250.8 5 
   33 17 
  100 33 


    575.62
    244.02
(5-)
(4-)
   1545.78 5 A     (1-,2,3+)     1248.00 9 
  1492.78 7 
   10.3 26 
  100 8 


    297.857
     53.076
(3-)
(3-)
   1622.17 7 A     (1-,2,3+)     1324.36 7 
  100

    297.857
(3-)
   1625.43 10    DE (7+) 9.8 ns 5     130.4 5 
  1049.83 8 
  1494.45 15 
   10 4 
  100 10 
   20 8 
[E1]
(M2)
(E3)
   1495.02
    575.62
    130.89
(6-)
(5-)
(4-)
  ≈1700  C          
   1780.6 5    D  (5,6,7-)     1205.0 5 
  100

    575.62
(5-)
   1921.1 5    D  (5,6,7-)     1345.5 5 
  100

    575.62
(5-)
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
   2159.91 4 A     (0-,1)     1590.05 7 
  1724.63 12 
  1952.93 5 
  100 4 
   15.3 28 
   74 6 



    569.777
    435.178
    207.019
(1-,2-)
(2-)
(2-)
  ≈2300  C          
  ≈2400  C          
   2446.937 26 A     1+      287.10 15 
   824.90 15 
   901.22 6 
  1117.50 6 
  1399.62 5 
  1511.81 5 
  1637.68 5 
  1661.35 5 
  1877.10 9 
  2011.73 5 
  2239.92 5 
  2393.80 6 
  2442.55 5 
  2447.1 1 
    2.7 3 
    0.7 3 
    4.5 3 
    8.3 4 
   37.5 15 
   10.0 10 
    7.5 9 
    6.0 6 
    2.7 3 
   59.7 30 
   50.8 22 
    1.1 2 
  100.0 30 
    5.2 5 














   2159.91
   1622.17
   1545.78
   1329.382
   1047.261
    935.083
    809.185
    785.583
    569.777
    435.178
    207.019
     53.076
      4.37
      0.0
(0-,1)
(1-,2,3+)
(1-,2,3+)
(1-)
(2-)
(0-,1,2)
(0-,1,2-)
(0-)
(1-,2-)
(2-)
(2-)
(3-)
(2-)
1-
   2551.10 7 A     (0-,1)      929.3 2 
  1741.8 1 
  2115.9 1 
    5 5 
  100 20 
  100 15 



   1622.17
    809.185
    435.178
(1-,2,3+)
(0-,1,2-)
(2-)
  ≈2600  C   (1-,2)        
   2665.50 5 A     1+     1119.8 1 
  1618.6 1 
  1730.2 1 
  1879.8 1 
  2095.6 1 
  2661.0 1 
    3.2 8 
    2.2 8 
    5.0 13 
    2.7 8 
   22.4 10 
  100 4 






   1545.78
   1047.261
    935.083
    785.583
    569.777
      4.37
(1-,2,3+)
(2-)
(0-,1,2)
(0-)
(1-,2-)
(2-)
   2688.70 22    DE (7,8,9+)     1063.2 2 
  100

   1625.43
(7+)
E(level)
(keV)		XREFJπ(level) T1/2(level)E(γ)
(keV)		I(γ)M(γ)Final Levels
   2796.77 6 A     (1)     1174.5 2 
  1467.3 2 
  2011.2 2 
  2226.9 1 
  2362.0 2 
  2589.7 1 
   10 5 
   35 10 
   10 5 
   60 10 
   25 10 
  100 15 






   1622.17
   1329.382
    785.583
    569.777
    435.178
    207.019
(1-,2,3+)
(1-)
(0-)
(1-,2-)
(2-)
(2-)
   3074.8 7    D      1153.7 5 
  100

   1921.1
(5,6,7-)
  ≈3100  C          
   3225.41 6 A     (1+)     2178.1 1 
  2290.2 1 
  2439.8 1 
  2790.3 1 
   34 10 
   31 10 
   25 6 
  100 10 




   1047.261
    935.083
    785.583
    435.178
(2-)
(0-,1,2)
(0-)
(2-)
   3242.58 22    DE (8+)     1617.2 2 
  100

   1625.43
(7+)
   3365.28 7 A     (1+)     1876.2 2 
  2430.6 3 
  2556.7 2 
  2579.3 2 
  3158.2 1 
  3365.1 2 
   89 17 
   28 11 
   28 11 
   33 11 
  100 17 
   56 17 






   1488.66
    935.083
    809.185
    785.583
    207.019
      0.0
(0-,1,2,3+)
(0-,1,2)
(0-,1,2-)
(0-)
(2-)
1-
  ≈3600  C          
   3765.4 4    D  (8,9,10+)      522.8 3 
  100

   3242.58
(8+)
   3815.8 4    D  (8,9,10+)      573.5 4 
  1126.7 5 
   40 20 
  100 40 


   3242.58
   2688.70
(8+)
(7,8,9+)

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

Jπ(level): Assignments are based mostly on shell-model calculations by 2016Ur04, and multiplets based on spherical configurations proposed for valence protons and neutrons, and also configurations proposed by 2009Po10 for selected levels. Arguments for each level are given under comments. Note that 2016Ur04 give firm Jπ assignments for many levels, but based on strong (and weak) rules for Jπ assignments for ENSDF evaluations, almost all the assignments are in parentheses in this dataset, with the exception of firm 1+ for two strongly-populated levels in 86Se β- decay from 0+ parent. Evaluators also differ in assignments for many of the levels from those in 2016Ur04 where no shell-model calculations are available. The orbitals contributing near the Fermi level are: π2p3/2, π1f5/2-1 and ν2d5/2, forming low-energy multiplets: π2p3/2~#ν2d5/2, Jπ=1- to 4-; and π1f5/2-1~#ν2d5/2, Jπ=0- to 5-, whereas medium energy excitations can involve π1g9/2 and ν1g7/2 orbitals with π1g9/2~#ν2d5/2, Jπ=2+ to 7+; and π1g9/2~#ν2g7/2, Jπ=1+ to 8+ (2016Ur04)

M(γ): Assumed multipolarities are listed in square brackets for transitions with significant conversion coefficients.

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
      4.37 (2-)        4.37 3 (M1) 129.9α=129.9 33
     53.076 (3-)       48.71 5 M1(+E2)0.1 LT0.92α=0.92 6
    130.89 (4-)       77.80 5 M1+E20.18 +6-90.29α=0.29 5
    207.019 (2-)      153.91 5 E2+M110 90.18α=0.18 7
(2-)      202.66 5 [M1+E2] 0.041α=0.041 24
(2-)      207.04 5 [M1+E2] 0.038α=0.038 22
    297.857 (3-)       53.7 2 [M1+E2] 4.6α=4.6 40
(3-)       90.90 7 [M1+E2] 0.7α=0.7 6
(3-)      166.96 5 E2+M11.6 100.10α=0.10 5
(3-)      244.75 9 [M1+E2] 0.022α=0.022 11
(3-)      293.51 5 [M1+E2] 0.012α=0.012 5
    435.178 (2-)      137.35 8 [M1+E2] 0.16α=0.16 11
(2-)      228.20 5 [M1+E2] 0.027α=0.027 15
   1625.43 (7+) 9.8 ns 5     130.4 5 [E1] 0.0384B(E1)(W.u.)=1.23E-6 46, α=0.0384 7
(7+) 9.8 ns 5    1049.83 8 (M2) 8.67×10-4B(M2)(W.u.)=0.10 2, α=8.67×10-4 13
(7+) 9.8 ns 5    1494.45 15 (E3) 3.77×10-4B(E3)(W.u.)=2.6 9, α=3.77E-4 6

Back to top

Additional Level Data and Comments:

E(level)Jπ(level)T1/2(level)Comments
    130.89(4-)   XREF: C(200).
    244.02(4-)   Population in (t,3Heγ) is uncertain as only a weak 191γ, with uncertain assignment to 86Br is reported.
E(level): Population in (t,3Heγ) is uncertain as only a weak 191γ, with uncertain assignment to 86Br is reported.
    900   L(t,3He)|>2, with a 932-keV γ ray associated with the excitation energy of ≈900 keV 300.
   1700   Deduced Gamow-Teller strength=0.045 +43-45 (2019Ti09).
   2300   L(t,3He)=1, with 932-keV and 1427-keV γ rays associated with an excitation energy of ≈2300 keV 300. 2019Ti09 also considered the possibility that 2361γ was associated with 2300 keV excitation, in view of large uncertainty of 300 keV for excitation energy. If all the three γ rays 932, 1427 and 2361 are associated with 2300 keV excitation, then this state is not 1+, as a Gamow-Teller transition.
   2400   Deduced Gamow-Teller strength=0.063 +46-63 (2019Ti09).
   2600(1-,2)   L(t,3He)=1, Jπ=2- from 2019Ti09, with a 382-keV γ associated with an excitation energy of ≈2600 keV 300. 2016Ur04 assigned 1-,2 for a 2551 level in 86Se β- decay study.
   3100   L(t,3He)|>1, Jπ=2- from 2019Ti09, with a 207-keV γ associated with an excitation energy of ≈3100 keV 300. 2016Ur04 assigned 1-,2 for a 2797 level in 86Se β- decay.
   3600   L(t,3He)|>1, with a 207-keV γ associated with an excitation energy of ≈3600 keV 300.

Back to top

Additional Gamma Comments:

E(level)E(gamma)Comments
      4.37      4.37E(γ): from level-energy difference.
M(γ): proposed by evaluators as (M1) analogous to known dominant M1 transitions between the first excited state and the g.s. in the neighboring n=51 isotones 84As, 88Rb and 90Y (as compiled in the ENSDF and XUNDL database from references relevant to these nuclei). Small E2 admixture is possible
    244.02    190.94E(γ): others: 191.1 2 in 86Se β- decay (2016Ur04), 190.3 2 in (18O,Fγ) (2009Po10) are in agreement but less precise. From 235U(n,Fγ) (2016Ur04)
I(γ): From 235U(n,Fγ) (2016Ur04)
M(γ): from γγ(θ) in (18O,Fγ) (2009Po10); (M1) from (ΔJπ)
    575.62    331.61E(γ): From 235U(n,Fγ) (2016Ur04)
I(γ): From 235U(n,Fγ) (2016Ur04)
M(γ): from γγ(θ) in (18O,Fγ) (2009Po10); (M1) from (ΔJπ)
    444.78E(γ): From 235U(n,Fγ) (2016Ur04)
I(γ): From 235U(n,Fγ) (2016Ur04)
   1495.02    919.5E(γ): From 208Pb(18O,Fγ) (2009Po10)
I(γ): From 208Pb(18O,Fγ) (2009Po10)
   1250.8E(γ): From 208Pb(18O,Fγ) (2009Po10)
I(γ): From 208Pb(18O,Fγ) (2009Po10)
   1625.43    130.4E(γ): From 208Pb(18O,Fγ) (2009Po10)
I(γ): From 208Pb(18O,Fγ) (2009Po10)
   1049.83E(γ): from 235U(n,Fγ). Other: Eγ=1049.6 2 in (18O,Fγ)
I(γ): from (18O,Fγ) (2009Po10). Other: 100 20 in 235U(n,Fγ)
M(γ): M2 consistent with B(M2)(W.u.)
   1494.45E(γ): from 235U(n,Fγ). Other: Eγ=1493.5 5 in (18O,Fγ)
I(γ): average of 16 8 from (18O,Fγ) and 24 8 in 235U(n,Fγ)
M(γ): E3 consistent with B(E3)(W.u.)
   1780.6   1205.0E(γ): From 208Pb(18O,Fγ) (2009Po10)
I(γ): From 208Pb(18O,Fγ) (2009Po10)
   1921.1   1345.5E(γ): From 208Pb(18O,Fγ) (2009Po10)
I(γ): From 208Pb(18O,Fγ) (2009Po10)
   2665.50   1618.6E(γ): somewhat poor fit, level-energy difference=1618.2
   2688.70   1063.2E(γ): From 235U(n,Fγ) (2016Ur04)
I(γ): From 235U(n,Fγ) (2016Ur04)
   3074.8   1153.7E(γ): From 208Pb(18O,Fγ) (2009Po10)
I(γ): From 208Pb(18O,Fγ) (2009Po10)
   3242.58   1617.2E(γ): From 235U(n,Fγ) (2016Ur04)
I(γ): From 235U(n,Fγ) (2016Ur04)
   3365.28   2556.7E(γ): somewhat poor fit, level-energy difference=2556.1
   3765.4    522.8E(γ): From 208Pb(18O,Fγ) (2009Po10)
I(γ): From 208Pb(18O,Fγ) (2009Po10)
   3815.8    573.5E(γ): From 208Pb(18O,Fγ) (2009Po10)
I(γ): From 208Pb(18O,Fγ) (2009Po10)
   1126.7E(γ): From 208Pb(18O,Fγ) (2009Po10)
I(γ): From 208Pb(18O,Fγ) (2009Po10)

Back to top