Bromine-74

Properties and data of the isotope ⁷⁴Br.

Contents

General data

Name of the isotope:Bromine-74; Br-74Symbol:⁷⁴Br or 7435BrMass number A:74 (= number of nucleons)Atomic number Z:35 (= number of protons)Neutrons N:39Isotopic mass:73.929910(6) u (atomic weight of Bromine-74)Nuclide mass:73.9107104 u (calculated nuclear mass without electrons)Mass excess:-65.28841 MeVMass defect:0.68189784399999 u (per nucleus)Nuclear binding energy:635.1837503 MeV (per nucleus)
8.58356419 MeV (average binding energy per nucleon)Separation energy:S_N = 9.712(9) MeV (first neutron)
S_P = 4.350(9) MeV (first proton)Half-life:25.4(3) minDecay constant λ:0.00045482098461939 s^-1Specific activity α:3.752049363606 × 10⁺¹⁸ Bq g^-1
101406739.55694 Ci g^-1Spin and parity:
(nuclear angular momentum)(0-)Magnetic dipole moment:μ(μ_N) = 1.820(12)Year of discovery:1952

Radioactive Decay

Half-life T_½ = 25.4(3) min (minutes) respectively 1.524 × 10³ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC/β⁺	⁷⁴Se	100 %	6.925(6) MeV

Parent Nuclides

Direct parent isotope is: ⁷⁴Kr.

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
^74mBr	13.58(21) keV	46(2) min	4(+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 39) and isobaric (same nucleon number A = 74) with Bromine-74. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 39	Isobar A = 74
21	⁶⁰Sc
22	⁶¹Ti
23	⁶²V
24	⁶³Cr
25	⁶⁴Mn
26	⁶⁵Fe	⁷⁴Fe
27	⁶⁶Co	⁷⁴Co
28	⁶⁷Ni	⁷⁴Ni
29	⁶⁸Cu	⁷⁴Cu
30	⁶⁹Zn	⁷⁴Zn
31	⁷⁰Ga	⁷⁴Ga
32	⁷¹Ge	⁷⁴Ge
33	⁷²As	⁷⁴As
34	⁷³Se	⁷⁴Se
35	⁷⁴Br	⁷⁴Br
36	⁷⁵Kr	⁷⁴Kr
37	⁷⁶Rb	⁷⁴Rb
38	⁷⁷Sr	⁷⁴Sr
39	⁷⁸Y
40	⁷⁹Zr
42	⁸¹Mo