Bromine-84

Properties and data of the isotope ⁸⁴Br.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

See also: List of individual Bromine isotopes (and general data sources).

General data

Name of the isotope:Bromine-84; Br-84Symbol:⁸⁴Br or 8435BrMass number A:84 (= number of nucleons)Atomic number Z:35 (= number of protons)Neutrons N:49Nucleon pairing (Z - N):odd - oddNuclear ratio (N/Z ratio):1.4 (= neutron-proton ratio)Neutron excess (N-Z):14Isotopic mass:83.916496(28) u (atomic weight of Bromine-84)Nuclide mass:83.8972964 u (calculated nuclear mass without electrons)Mass excess:-77.78347 MeVMass defect:0.78196100400001 u (per nucleus)Nuclear binding energy:728.39198346 MeV (per nucleus)
8.67133314 MeV (average binding energy per nucleon)Separation energy:S_N = 6.841(26) MeV (first neutron)
S_P = 9.732(26) MeV (first proton)Half-life:31.76(8) minDecay constant λ:0.00036374222321576 s^-1Specific activity α:2.639164945676 × 10⁺¹⁸ Bq g^-1
71328782.315592 Ci g^-1Spin and parity:
(nuclear angular momentum)2-Magnetic dipole moment:μ(μ_N) = 1.9(7)Nuclear g-factor:g_l = 0.95Year of discovery:1943

Radioactive Decay

Half-life T_½ = 31.76(8) min (minutes) respectively 1.9056 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁸⁴Kr	100 %	4.656(26) MeV

Parent Nuclides

Direct parent isotope is: ⁸⁴Se.

Nuclear Isomers

Nuclear isomers or excited states with the activation energy in keV related to the ground state.

Nuclear Isomer	Excitation Energy	Half-life	Spin
^84m1Br	320(10) keV	6.0(2) min	(6)-
^84m2Br	408.2(4) keV	0.14 μs	1+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 49) and isobaric (same nucleon number A = 84) with Bromine-84. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 49	Isobar A = 84
27	⁷⁶Co
28	⁷⁷Ni
29	⁷⁸Cu
30	⁷⁹Zn	⁸⁴Zn
31	⁸⁰Ga	⁸⁴Ga
32	⁸¹Ge	⁸⁴Ge
33	⁸²As	⁸⁴As
34	⁸³Se	⁸⁴Se
35	⁸⁴Br	⁸⁴Br
36	⁸⁵Kr	⁸⁴Kr
37	⁸⁶Rb	⁸⁴Rb
38	⁸⁷Sr	⁸⁴Sr
39	⁸⁸Y	⁸⁴Y
40	⁸⁹Zr	⁸⁴Zr
41	⁹⁰Nb	⁸⁴Nb
42	⁹¹Mo	⁸⁴Mo
43	⁹²Tc
44	⁹³Ru
45	⁹⁴Rh
46	⁹⁵Pd
47	⁹⁶Ag
48	⁹⁷Cd
49	⁹⁸In
50	⁹⁹Sn