Gallium-74

Properties and data of the isotope ⁷⁴Ga.

Contents

General data

Name of the isotope:Gallium-74; Ga-74Symbol:⁷⁴Ga or 7431GaMass number A:74 (= number of nucleons)Atomic number Z:31 (= number of protons)Neutrons N:43Isotopic mass:73.926946(3) u (atomic weight of Gallium-74)Nuclide mass:73.9099406 u (calculated nuclear mass without electrons)Mass excess:-68.04936 MeVMass defect:0.68822138 u (per nucleus)Nuclear binding energy:641.07408614 MeV (per nucleus)
8.66316333 MeV (average binding energy per nucleon)Separation energy:S_N = 6.422(3) MeV (first neutron)
S_P = 9.745(4) MeV (first proton)Half-life:8.12(12) minDecay constant λ:0.0014227158878488 s^-1Specific activity α:1.173670613739 × 10⁺¹⁹ Bq g^-1
317208273.98354 Ci g^-1Spin and parity:
(nuclear angular momentum)(3-)Magnetic dipole moment:μ(μ_N) = 0.00(8)Quadrupole moment Q:+0.549(40) barn (100 fm²)Year of discovery:1956

Radioactive Decay

Half-life T_½ = 8.12(12) min (minutes) respectively 4.872 × 10² seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^-	⁷⁴Ge	100 %	5.373(3) MeV

Parent Nuclides

Direct parent isotope is: ⁷⁴Zn.

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
^74mGa	59.571(14) keV	9.5(10) s	(0+)

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 43) and isobaric (same nucleon number A = 74) with Gallium-74. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 43	Isobar A = 74
23	⁶⁶V
24	⁶⁷Cr
25	⁶⁸Mn
26	⁶⁹Fe	⁷⁴Fe
27	⁷⁰Co	⁷⁴Co
28	⁷¹Ni	⁷⁴Ni
29	⁷²Cu	⁷⁴Cu
30	⁷³Zn	⁷⁴Zn
31	⁷⁴Ga	⁷⁴Ga
32	⁷⁵Ge	⁷⁴Ge
33	⁷⁶As	⁷⁴As
34	⁷⁷Se	⁷⁴Se
35	⁷⁸Br	⁷⁴Br
36	⁷⁹Kr	⁷⁴Kr
37	⁸⁰Rb	⁷⁴Rb
38	⁸¹Sr	⁷⁴Sr
39	⁸²Y
40	⁸³Zr
41	⁸⁴Nb
42	⁸⁵Mo
43	⁸⁶Tc
44	⁸⁷Ru