Germanium-71

Properties and data of the isotope ⁷¹Ge.

Contents

General Data

Radioactive Decay

Parent Nuclides

Isotones und Isobares

Literature

Germanium-71 is a radioisotope of the chemical element germanium, which has 39 neutrons in its atomic nucleus in addition to the element-specific 32 protons, resulting in a mass number of 71. The very short-lived, only artificially produced, unstable and thus radioactive nuclide has no practical technical significance; the study of ⁷¹Ge is exclusively for academic purposes or research.

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

General data

Name of the isotope:Germanium-71; Ge-71Symbol:⁷¹Ge or 7132GeMass number A:71 (= number of nucleons)Atomic number Z:32 (= number of protons)Neutrons N:39Nucleon pairing (Z - N):even - oddNuclear ratio (N/Z ratio):1.21875 (= neutron-proton ratio)Neutron excess (N-Z):7Isotopic mass:70.9249521(9) u (atomic weight of Germanium-71)Nuclide mass:70.9073981 u (calculated nuclear mass without electrons)Mass excess:-69.90667 MeVMass defect:0.663380648 u (per nucleus)Nuclear binding energy:617.93509333 MeV (per nucleus)
8.70331117 MeV (average binding energy per nucleon)Separation energy:S_N = 7.41594(11) MeV (first neutron)
S_P = 8.2855(14) MeV (first proton)Half-life:11.468(8) dDecay constant λ:6.995584942480 × 10^-7 s^-1Specific activity α:6.018342560181 × 10⁺¹⁵ Bq g^-1
162657.90703193 Ci g^-1Spin and parity:
(nuclear angular momentum)1/2-Magnetic dipole moment:μ(μ_N) = + 0.546(5)Nuclear g-factor:g_l = 1.092Year of discovery:1941

Radioactive Decay

In 2024, a new value for the half-life of the nuclide ⁷¹Ge was published [1], which has been adopted here; previously it was given as t^1/2 = 11.43(3) days.

Half-life T_½ = 11.468(8) d respectively 9.908352 × 10⁵ seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EC	⁷¹Ga	100 %	0.2325(12) MeV

Parent Nuclides

Direct parent isotope is: ⁷¹As.

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 39) and isobaric (same nucleon number A = 71) with Germanium-71. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

Z	Isotone N = 39	Isobar A = 71
19	⁵⁸K
21	⁶⁰Sc
22	⁶¹Ti
23	⁶²V
24	⁶³Cr
25	⁶⁴Mn	⁷¹Mn
26	⁶⁵Fe	⁷¹Fe
27	⁶⁶Co	⁷¹Co
28	⁶⁷Ni	⁷¹Ni
29	⁶⁸Cu	⁷¹Cu
30	⁶⁹Zn	⁷¹Zn
31	⁷⁰Ga	⁷¹Ga
32	⁷¹Ge	⁷¹Ge
33	⁷²As	⁷¹As
34	⁷³Se	⁷¹Se
35	⁷⁴Br	⁷¹Br
36	⁷⁵Kr	⁷¹Kr
37	⁷⁶Rb	⁷¹Rb
38	⁷⁷Sr
39	⁷⁸Y
40	⁷⁹Zr
42	⁸¹Mo