Germanium-61

Properties and data of the isotope ⁶¹Ge.

Content

General data

Name of the isotope:Germanium-61; Ge-61Symbol:⁶¹Ge or 6132GeMass number A:61 (= number of nucleons)Atomic number Z:32 (= number of protons)Neutrons N:29Isotopic mass:60.96419(32) u (atomic weight of Germanium-61)Nuclide mass:60.946636 u (calculated nuclear mass without electrons)Mass excess:-33.3568 MeVMass defect:0.537493588 u (per nucleus)Nuclear binding energy:500.67205226 MeV (per nucleus)
8.20773856 MeV (average binding energy per nucleon)Separation energy:S_N = 14.34(42) MeV (first neutron)
S_P = 1.06(36) MeV (first proton)Half-life:44(6) msDecay constant λ:15.753345012726 s^-1Specific activity α:1.581147711363 × 10⁺²³ Bq g^-1
4273372192874.6 Ci g^-1Spin and parity:
(nuclear angular momentum)(3/2-)Mirror nucleus:Copper-61Year of discovery:1987

Radioactive Decay

Half-life T_½ = 44(6) ms respectively 4.4 × 10^-2 seconds s.

Decay mode	Daughter	Probability	Decay energy	γ energy (intensity)
EE/β⁺	⁶¹Ga	< 38 %	13.77(30) MeV
EE, p	⁶⁰Zn	> 62 %

Isotones and Isobars

The following table shows the atomic nuclei that are isotonic (same neutron number N = 29) and isobaric (same nucleon number A = 61) with Germanium-61. Naturally occurring isotopes are marked in green; light green = naturally occurring radionuclides.

OZ	Isotone N = 29	Isobar A = 61
13	⁴²Al
14	⁴³Si
15	⁴⁴P
16	⁴⁵S
17	⁴⁶Cl
18	⁴⁷Ar
19	⁴⁸K
20	⁴⁹Ca
21	⁵⁰Sc	⁶¹Sc
22	⁵¹Ti	⁶¹Ti
23	⁵²V	⁶¹V
24	⁵³Cr	⁶¹Cr
25	⁵⁴Mn	⁶¹Mn
26	⁵⁵Fe	⁶¹Fe
27	⁵⁶Co	⁶¹Co
28	⁵⁷Ni	⁶¹Ni
29	⁵⁸Cu	⁶¹Cu
30	⁵⁹Zn	⁶¹Zn
31	⁶⁰Ga	⁶¹Ga
32	⁶¹Ge	⁶¹Ge
33	⁶²As
34	⁶³Se