Isotopes of Bromine
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Isotopes of Bromine
Main isotopes of bromine (35Br)
Iso­tope Decay
abun­dance half-life (t1/2) mode pro­duct
79Br 51% stable
81Br 49% stable
Standard atomic weight Ar, standard(Br)
  • Conventional: 79.904

Bromine (35Br) 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.

List of isotopes

Nuclide
[n 1]
Z N Isotopic mass (u)
[n 2][n 3]
Half-life
Decay
mode

[n 4]
Daughter
isotope

[n 5][n 6]
Spin and
parity
[n 7][n 8]
Natural abundance (mole fraction)
Excitation energy Normal proportion Range of variation
68Br[2] 35 33 67.95836(28)# ~50 ns 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 ?+ 70Se 0+#
70mBr 2292.2(8) keV 2.2(2) s ?+ 70Se (9+)
IT 70Br
71Br 35 36 70.93874(61) 21.4(6) s ?+ 71Se (5/2)-
72Br 35 37 71.93664(6) 78.6(24) s ?+ 72Se 1+
72mBr 100.92(3) keV 10.6(3) s IT (>99.9%) 72Br 1-
?+ (<0.1%) 72Se
73Br 35 38 72.93169(5) 3.4(2) min ?+ 73Se 1/2-
74Br 35 39 73.929891(16) 25.4(3) min ?+ 74Se (0-)
74mBr 13.58(21) keV 46(2) min ?+ 74Se 4(+#)
75Br 35 40 74.925776(15) 96.7(13) min ?+ 75Se 3/2-
76Br 35 41 75.924541(10) 16.2(2) h ?+ 76Se 1-
76mBr 102.58(3) keV 1.31(2) s IT (99.4%) 76Br (4)+
?+ (0.6%) 76Se
77Br 35 42 76.921379(3) 57.036(6) h ?+ 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 ?+ (99.99%) 78Se 1+
?- (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 ?- (91.7%) 80Kr 1+
?+ (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 ?- 82Kr 5-
82mBr 45.9492(10) keV 6.13(5) min IT 82Br 2-
?- 82Kr
83Br 35 48 82.915180(5) 2.40(2) h ?- 83Kr 3/2-
83mBr 3068.8(6) keV 700(100) ns (19/2-)
84Br 35 49 83.916479(16) 31.80(8) min ?- 84Kr 2-
84m1Br 320(10) keV 6.0(2) min ?- 84Kr 6-
84m2Br 408.2(4) keV <140 ns 1+
85Br 35 50 84.915608(21) 2.90(6) min ?- 85Kr 3/2-
86Br 35 51 85.918798(12) 55.1(4) s ?- 86Kr (2-)
87Br 35 52 86.920711(19) 55.65(13) s ?- (97.48%) 87Kr 3/2-
?-, n (2.52%) 86Kr
88Br 35 53 87.92407(4) 16.29(6) s ?- (93.42%) 88Kr (2-)
?-, n (6.48%) 87Kr
88mBr 272.7(3) keV 5.4(7) µs
89Br 35 54 88.92639(6) 4.40(3) s ?- (86.2%) 89Kr (3/2-,5/2-)
?-, n (13.8%) 88Kr
90Br 35 55 89.93063(8) 1.91(1) s ?- (74.8%) 90Kr
?-, n (25.2%) 89Kr
91Br 35 56 90.93397(8) 541(5) ms ?- (80%) 91Kr 3/2-#
?-, n (20%) 90Kr
92Br 35 57 91.93926(5) 0.343(15) s ?- (66.9%) 92Kr (2-)
?-, n (33.1%) 91Kr
93Br 35 58 92.94305(32)# 102(10) ms ?- (89%) 93Kr 3/2-#
?-, n (11%) 92Kr
94Br 35 59 93.94868(43)# 70(20) ms ?- (70%) 94Kr
?-, 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. ^ mBr – Excited nuclear isomer.
  2. ^ ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
  3. ^ # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
  4. ^ Modes of decay:
  5. ^ Bold italics symbol as daughter – Daughter product is nearly stable.
  6. ^ Bold symbol as daughter – Daughter product is stable.
  7. ^ ( ) spin value – Indicates spin with weak assignment arguments.
  8. ^ # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).

References

  1. ^ Meija, Juris; et al. (2016). "Atomic weights of the elements 2013 (IUPAC Technical Report)". Pure and Applied Chemistry. 88 (3): 265-91. doi:10.1515/pac-2015-0305.
  2. ^ Wimmer, K.; et al. (2019). "Discovery of 68Br in secondary reactions of radioactive beams". Physics Letters B. 795: 266-270. arXiv:1906.04067. doi:10.1016/j.physletb.2019.06.014.

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