Isotopes of bromine

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Bromine (Br) has two stable isotopes, 79Br and 81Br, and 30 known unstable isotopes, the most stable of which is 77Br with a half-life of 57.036 hours.
Standard atomic mass: 79.904(1) u

Table[edit]

nuclide
symbol
Z(p)N(n) 
isotopic mass (u)
 
half-lifedecay
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
66Br3531p65Se
67Br353266.96479(54)#p66Se1/2−#
68Br353367.95852(38)#<1.2 µsp67Se3+#
69Br353468.95011(11)#<24 nsp68Se1/2−#
70Br353569.94479(33)#79.1(8) msβ+70Se0+#
70mBr2292.2(8) keV2.2(2) sβ+70Se(9+)
IT70Br
71Br353670.93874(61)21.4(6) sβ+71Se(5/2)−
72Br353771.93664(6)78.6(24) sβ+72Se1+
72mBr100.92(3) keV10.6(3) sIT (>99.9%)72Br1−
β+ (<0.1%)72Se
73Br353872.93169(5)3.4(2) minβ+73Se1/2−
74Br353973.929891(16)25.4(3) minβ+74Se(0−)
74mBr13.58(21) keV46(2) minβ+74Se4(+#)
75Br354074.925776(15)96.7(13) minβ+75Se3/2−
76Br354175.924541(10)16.2(2) hβ+76Se1−
76mBr102.58(3) keV1.31(2) sIT (99.4%)76Br(4)+
β+ (0.6%)76Se
77Br354276.921379(3)57.036(6) hβ+77Se3/2−
77mBr105.86(8) keV4.28(10) minIT77Br9/2+
78Br354377.921146(4)6.46(4) minβ+ (99.99%)78Se1+
β (0.01%)78Kr
78mBr180.82(13) keV119.2(10) µs(4+)
79Br354478.9183371(22)Stable3/2−0.5069(7)
79mBr207.61(9) keV4.86(4) sIT79Br(9/2+)
80Br354579.9185293(22)17.68(2) minβ (91.7%)80Kr1+
β+ (8.3%)80Se
80mBr85.843(4) keV4.4205(8) hIT80Br5−
81Br354680.9162906(21)Stable3/2−0.4931(7)
81mBr536.20(9) keV34.6(28) µs9/2+
82Br354781.9168041(21)35.282(7) hβ82Kr5−
82mBr45.9492(10) keV6.13(5) minIT82Br2−
β82Kr
83Br354882.915180(5)2.40(2) hβ83Kr3/2−
83mBr3068.8(6) keV700(100) ns(19/2−)
84Br354983.916479(16)31.80(8) minβ84Kr2−
84m1Br320(10) keV6.0(2) minβ84Kr6−
84m2Br408.2(4) keV<140 ns1+
85Br355084.915608(21)2.90(6) minβ85Kr3/2−
86Br355185.918798(12)55.1(4) sβ86Kr(2−)
87Br355286.920711(19)55.65(13) sβ (97.48%)87Kr3/2−
β, n (2.52%)86Kr
88Br355387.92407(4)16.29(6) sβ (93.42%)88Kr(2−)
β, n (6.48%)87Kr
88mBr272.7(3) keV5.4(7) µs
89Br355488.92639(6)4.40(3) sβ (86.2%)89Kr(3/2−,5/2−)
β, n (13.8%)88Kr
90Br355589.93063(8)1.91(1) sβ (74.8%)90Kr
β, n (25.2%)89Kr
91Br355690.93397(8)541(5) msβ (80%)91Kr3/2−#
β, n (20%)90Kr
92Br355791.93926(5)0.343(15) sβ (66.9%)92Kr(2−)
β, n (33.1%)91Kr
93Br355892.94305(32)#102(10) msβ (89%)93Kr3/2−#
β, n (11%)92Kr
94Br355993.94868(43)#70(20) msβ (70%)94Kr
β, n (30%)93Kr
95Br356094.95287(54)#50# ms [>300 ns]3/2−#
96Br356195.95853(75)#20# ms [>300 ns]
97Br356296.96280(86)#10# ms [>300 ns]3/2−#
  1. ^ Abbreviations:
    IT: Isomeric transition
  2. ^ Bold for stable isotopes

Notes[edit]

References[edit]

  1. ^ http://www.nucleonica.net/unc.aspx


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Table of nuclides