Isotopes of bromine

Bromine (Br) has two stable isotopes, 79Br and 81Br, and 30 known radioisotopes, the most stable of which is 77Br, with a half-life of 57.036 hours. Bromine and chlorine are the only halogens with more than one stable isotope.
Relative atomic mass: 79.904(1)

Table

nuclide
symbol
Z(p) N(n)  
isotopic mass (u)
 
half-life decay
mode(s)[1][n 1]
daughter
isotope(s)[n 2]
nuclear
spin
representative
isotopic
composition
(mole fraction)
range of natural
variation
(mole fraction)
excitation energy
66Br 35 31 p 65Se
67Br 35 32 66.96479(54)# p 66Se 1/2−#
68Br 35 33 67.95852(38)# <1.2 µs p 67Se 3+#
69Br 35 34 68.95011(11)# <24 ns p 68Se 1/2−#
70Br 35 35 69.94479(33)# 79.1(8) ms β+ 70Se 0+#
70mBr 2292.2(8) keV 2.2(2) s β+ 70Se (9+)
IT 70Br
71Br 35 36 70.93874(61) 21.4(6) s β+ 71Se (5/2)−
72Br 35 37 71.93664(6) 78.6(24) s β+ 72Se 1+
72mBr 100.92(3) keV 10.6(3) s IT (>99.9%) 72Br 1−
β+ (<0.1%) 72Se
73Br 35 38 72.93169(5) 3.4(2) min β+ 73Se 1/2−
74Br 35 39 73.929891(16) 25.4(3) min β+ 74Se (0−)
74mBr 13.58(21) keV 46(2) min β+ 74Se 4(+#)
75Br 35 40 74.925776(15) 96.7(13) min β+ 75Se 3/2−
76Br 35 41 75.924541(10) 16.2(2) h β+ 76Se 1−
76mBr 102.58(3) keV 1.31(2) s IT (99.4%) 76Br (4)+
β+ (0.6%) 76Se
77Br 35 42 76.921379(3) 57.036(6) h β+ 77Se 3/2−
77mBr 105.86(8) keV 4.28(10) min IT 77Br 9/2+
78Br 35 43 77.921146(4) 6.46(4) min β+ (99.99%) 78Se 1+
β (0.01%) 78Kr
78mBr 180.82(13) keV 119.2(10) µs (4+)
79Br 35 44 78.9183371(22) Stable 3/2− 0.5069(7)
79mBr 207.61(9) keV 4.86(4) s IT 79Br (9/2+)
80Br 35 45 79.9185293(22) 17.68(2) min β (91.7%) 80Kr 1+
β+ (8.3%) 80Se
80mBr 85.843(4) keV 4.4205(8) h IT 80Br 5−
81Br 35 46 80.9162906(21) Stable 3/2− 0.4931(7)
81mBr 536.20(9) keV 34.6(28) µs 9/2+
82Br 35 47 81.9168041(21) 35.282(7) h β 82Kr 5−
82mBr 45.9492(10) keV 6.13(5) min IT 82Br 2−
β 82Kr
83Br 35 48 82.915180(5) 2.40(2) h β 83Kr 3/2−
83mBr 3068.8(6) keV 700(100) ns (19/2−)
84Br 35 49 83.916479(16) 31.80(8) min β 84Kr 2−
84m1Br 320(10) keV 6.0(2) min β 84Kr 6−
84m2Br 408.2(4) keV <140 ns 1+
85Br 35 50 84.915608(21) 2.90(6) min β 85Kr 3/2−
86Br 35 51 85.918798(12) 55.1(4) s β 86Kr (2−)
87Br 35 52 86.920711(19) 55.65(13) s β (97.48%) 87Kr 3/2−
β, n (2.52%) 86Kr
88Br 35 53 87.92407(4) 16.29(6) s β (93.42%) 88Kr (2−)
β, n (6.48%) 87Kr
88mBr 272.7(3) keV 5.4(7) µs
89Br 35 54 88.92639(6) 4.40(3) s β (86.2%) 89Kr (3/2−,5/2−)
β, n (13.8%) 88Kr
90Br 35 55 89.93063(8) 1.91(1) s β (74.8%) 90Kr
β, n (25.2%) 89Kr
91Br 35 56 90.93397(8) 541(5) ms β (80%) 91Kr 3/2−#
β, n (20%) 90Kr
92Br 35 57 91.93926(5) 0.343(15) s β (66.9%) 92Kr (2−)
β, n (33.1%) 91Kr
93Br 35 58 92.94305(32)# 102(10) ms β (89%) 93Kr 3/2−#
β, n (11%) 92Kr
94Br 35 59 93.94868(43)# 70(20) ms β (70%) 94Kr
β, n (30%) 93Kr
95Br 35 60 94.95287(54)# 50# ms [>300 ns] 3/2−#
96Br 35 61 95.95853(75)# 20# ms [>300 ns]
97Br 35 62 96.96280(86)# 10# ms [>300 ns] 3/2−#
  1. Abbreviations:
    IT: Isomeric transition
  2. Bold for stable isotopes

Notes

References

  1. "Universal Nuclide Chart". nucleonica. (registration required (help)).
Isotopes of selenium Isotopes of bromine Isotopes of krypton
Table of nuclides
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