Germanium-76

Properties and data of the isotope ⁷⁶Ge.

Contents

General data

Name of the isotope:Germanium-76; Ge-76Symbol:⁷⁶Ge or 7632GeMass number A:76 (= number of nucleons)Atomic number Z:32 (= number of protons)Neutrons N:44Isotopic mass:75.9214027(2) u (atomic weight of Germanium-76)Nuclide mass:75.9038487 u (calculated nuclear mass without electrons)Mass excess:-73.21291 MeVMass defect:0.710254628 u (per nucleus)Nuclear binding energy:661.59792445 MeV (per nucleus)
8.70523585 MeV (average binding energy per nucleon)Separation energy:S_N = 9.42724(5) MeV (first neutron)
S_P = 12.0373(24) MeV (first proton)Half-life:1.926(94) × 10²¹ aDecay constant λ:1.141202124075 × 10^-29 s^-1Specific activity α:9.163306587786 × 10^-8 Bq g^-1
2.476569348050 × 10^-18 Ci g^-1Spin and parity:
(nuclear angular momentum)0+Charge radius:4.0811(11) femtometer fmYear of discovery:1933

Radioactive Decay

Half-life T_½ = 1.926(94) × 10²¹ a respectively 6.0738336 × 10²⁸ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
β^- β^-	⁷⁶Se

Parent Nuclides

Direct parent isotope is: ⁷⁶Ga.

Occurrence

Comparison of the natural Germanium isotopes including isotopic abundance (mole fraction of the isotope mixture in percent):

	Atomic Mass m_a	Quantity	Half-life	Spin
Germanium Isotopic mixture	72.630 u	100 %
Isotope ⁷⁰Ge	69.924249(6) u	20.52(19) %	stable	0+
Isotope ⁷²Ge	71.9220758(5) u	27.45(15) %	stable	0+
Isotope ⁷³Ge	72.9234590(4) u	7.76(8) %	stable	9/2+
Isotope ⁷⁴Ge	73.92117776(9) u	36.52(12) %	stable	0+
Isotope ⁷⁶Ge	75.9214027(2) u	7.75(12) %	1.926(94) × 10²¹ a	0+

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 44) and isobaric (same nucleon number A = 76) with Germanium-76. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 44	Isobar A = 76
23	⁶⁷V
24	⁶⁸Cr
25	⁶⁹Mn
26	⁷⁰Fe
27	⁷¹Co	⁷⁶Co
28	⁷²Ni	⁷⁶Ni
29	⁷³Cu	⁷⁶Cu
30	⁷⁴Zn	⁷⁶Zn
31	⁷⁵Ga	⁷⁶Ga
32	⁷⁶Ge	⁷⁶Ge
33	⁷⁷As	⁷⁶As
34	⁷⁸Se	⁷⁶Se
35	⁷⁹Br	⁷⁶Br
36	⁸⁰Kr	⁷⁶Kr
37	⁸¹Rb	⁷⁶Rb
38	⁸²Sr	⁷⁶Sr
39	⁸³Y	⁷⁶Y
40	⁸⁴Zr
41	⁸⁵Nb
42	⁸⁶Mo
43	⁸⁷Tc
44	⁸⁸Ru
45	⁸⁹Rh
46	⁹⁰Pd