Isotopes of germanium

Isotopes of germanium (₃₂Ge)
Standard atomic weight Ar°(Ge)
	72.630±0.008; 72.630±0.008 (abridged)[2][3];

Germanium (₃₂Ge) has five naturally occurring isotopes, ⁷⁰Ge, ⁷²Ge, ⁷³Ge, ⁷⁴Ge, and ⁷⁶Ge. Of these, ⁷⁶Ge is very slightly radioactive, decaying by double beta decay with a half-life of 1.78 × 10²¹ years[4] (130 billion times the age of the universe).

Stable ⁷⁴Ge is the most common isotope, having a natural abundance of approximately 36%. ⁷⁶Ge is the least common with a natural abundance of approximately 7%.[5] When bombarded with alpha particles, the isotopes ⁷²Ge and ⁷⁶Ge will generate stable ⁷⁵As and ⁷⁷Se, releasing high energy electrons in the process.[6]

At least 27 radioisotopes have also been synthesized ranging in atomic mass from 58 to 89. The most stable of these is ⁶⁸Ge, decaying by electron capture with a half-life of 270.95 d. It decays to the medically useful positron-emitting isotope ⁶⁸Ga. (See gallium-68 generator for notes on the source of this isotope, and its medical use.) The least stable known germanium isotope is ⁶⁰Ge with a half-life of 30 ms.

While most of germanium's radioisotopes decay by beta decay, ⁶¹Ge and ⁶⁵Ge can also decay by β⁺-delayed proton emission.[5] ⁸⁴Ge through ⁸⁷Ge also have minor β⁻-delayed neutron emission decay paths.[5]

⁷⁶Ge is used in experiments on the nature of neutrinos, by searching for neutrinoless double beta decay.

List of isotopes

Nuclide [n 1]	Z	N	Isotopic mass (Da) [n 2][n 3]	Half-life [n 4][n 5]	Decay mode [n 6]	Daughter isotope [n 7]	Spin and parity [n 8][n 5]	Natural abundance (mole fraction)
Nuclide [n 1]	Excitation energy			Half-life [n 4][n 5]	Decay mode [n 6]	Daughter isotope [n 7]	Spin and parity [n 8][n 5]	Normal proportion	Range of variation
⁵⁸Ge	32	26	57.99101(34)#		2p	⁵⁶Zn	0+
⁵⁹Ge	32	27	58.98175(30)#		2p	⁵⁷Zn	7/2−#
⁶⁰Ge	32	28	59.97019(25)#	30# ms	β⁺	⁶⁰Ga	0+
⁶⁰Ge	32	28	59.97019(25)#	30# ms	2p	⁵⁸Zn	0+
⁶¹Ge	32	29	60.96379(32)#	39(12) ms	β⁺, p (80%)	⁶⁰Zn	(3/2−)#
⁶¹Ge	32	29	60.96379(32)#	39(12) ms	β⁺ (20%)	⁶¹Ga	(3/2−)#
⁶²Ge	32	30	61.95465(15)#	129(35) ms	β⁺	⁶²Ga	0+
⁶³Ge	32	31	62.94964(21)#	142(8) ms	β⁺	⁶³Ga	(3/2−)#
⁶⁴Ge	32	32	63.94165(3)	63.7(25) s	β⁺	⁶⁴Ga	0+
⁶⁵Ge	32	33	64.93944(11)	30.9(5) s	β⁺ (99.99%)	⁶⁵Ga	(3/2)−
⁶⁵Ge	32	33	64.93944(11)	30.9(5) s	β⁺, p (.01%)	⁶⁴Zn	(3/2)−
⁶⁶Ge	32	34	65.93384(3)	2.26(5) h	β⁺	⁶⁶Ga	0+
⁶⁷Ge	32	35	66.932734(5)	18.9(3) min	β⁺	⁶⁷Ga	1/2−
^67m1Ge	18.20(5) keV			13.7(9) μs			5/2−
^67m2Ge	751.70(6) keV			110.9(14) ns			9/2+
⁶⁸Ge[n 9]	32	36	67.928094(7)	271.05(8) d	EC	⁶⁸Ga	0+
⁶⁹Ge	32	37	68.9279645(14)	39.05(10) h	β⁺	⁶⁹Ga	5/2−
^69m1Ge	86.765(14) keV			5.1(2) μs			1/2−
^69m2Ge	397.944(18) keV			2.81(5) μs			9/2+
⁷⁰Ge	32	38	69.9242474(11)	Stable			0+	0.2038(18)
⁷¹Ge	32	39	70.9249510(11)	11.43(3) d	EC	⁷¹Ga	1/2−
^71mGe	198.367(10) keV			20.40(17) ms	IT	⁷¹Ge	9/2+
⁷²Ge	32	40	71.9220758(18)	Stable			0+	0.2731(26)
^72mGe	691.43(4) keV			444.2(8) ns			0+
⁷³Ge	32	41	72.9234589(18)	Stable			9/2+	0.0776(8)
^73m1Ge	13.2845(15) keV			2.92(3) μs			5/2+
^73m2Ge	66.726(9) keV			499(11) ms			1/2−
⁷⁴Ge	32	42	73.9211778(18)	Stable			0+	0.3672(15)
⁷⁵Ge	32	43	74.9228589(18)	82.78(4) min	β⁻	⁷⁵As	1/2−
^75m1Ge	139.69(3) keV			47.7(5) s	IT (99.97%)	⁷⁵Ge	7/2+
^75m1Ge	139.69(3) keV			47.7(5) s	β⁻	⁷⁵As	7/2+
^75m2Ge	192.18(7) keV			216(5) ns			5/2+
⁷⁶Ge[n 10]	32	44	75.9214026(18)	(2.022±0.018±0.038)×10²¹ y[7]	β⁻β⁻	⁷⁶Se	0+	0.0783(7)
⁷⁷Ge	32	45	76.9235486(18)	11.30(1) h	β⁻	⁷⁷As	7/2+
^77mGe	159.70(10) keV			52.9(6) s	β⁻ (79%)	⁷⁷As	1/2−
^77mGe	159.70(10) keV			52.9(6) s	IT (21%)	⁷⁷Ge	1/2−
⁷⁸Ge	32	46	77.922853(4)	88(1) min	β⁻	⁷⁸As	0+
⁷⁹Ge	32	47	78.9254(1)	18.98(3) s	β⁻	⁷⁹As	(1/2)−
^79mGe	185.95(4) keV			39.0(10) s	β⁻ (96%)	⁷⁹As	(7/2+)#
^79mGe	185.95(4) keV			39.0(10) s	IT (4%)	⁷⁹Ge	(7/2+)#
⁸⁰Ge	32	48	79.92537(3)	29.5(4) s	β⁻	⁸⁰As	0+
⁸¹Ge	32	49	80.92882(13)	7.6(6) s	β⁻	⁸¹As	9/2+#
^81mGe	679.13(4) keV			7.6(6) s	β⁻ (99%)	⁸¹As	(1/2+)
^81mGe	679.13(4) keV			7.6(6) s	IT (1%)	⁸¹Ge	(1/2+)
⁸²Ge	32	50	81.92955(26)	4.55(5) s	β⁻	⁸²As	0+
⁸³Ge	32	51	82.93462(21)#	1.85(6) s	β⁻	⁸³As	(5/2+)#
⁸⁴Ge	32	52	83.93747(32)#	0.947(11) s	β⁻ (89.2%)	⁸⁴As	0+
⁸⁴Ge	32	52	83.93747(32)#	0.947(11) s	β⁻, n (10.8%)	⁸³As	0+
⁸⁵Ge	32	53	84.94303(43)#	535(47) ms	β⁻ (86%)	⁸⁵As	5/2+#
⁸⁵Ge	32	53	84.94303(43)#	535(47) ms	β⁻, n (14%)	⁸⁴As	5/2+#
⁸⁶Ge	32	54	85.94649(54)#	>150 ns	β⁻, n	⁸⁵As	0+
⁸⁶Ge	32	54	85.94649(54)#	>150 ns	β⁻	⁸⁶As	0+
⁸⁷Ge	32	55	86.95251(54)#	0.14# s			5/2+#
⁸⁸Ge	32	56	87.95691(75)#	>=300 ns			0+
⁸⁹Ge	32	57	88.96383(97)#	>150 ns			3/2+#
This table header & footer:

^mGe – Excited nuclear isomer.
( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
# – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
Bold half-life – nearly stable, half-life longer than age of universe.
# – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
Modes of decay:

EC: Electron capture

IT: Isomeric transition

n: Neutron emission

p: Proton emission
Bold symbol as daughter – Daughter product is stable.
( ) spin value – Indicates spin with weak assignment arguments.
Used to generate ⁶⁸Ga
Primordial radionuclide

Angular momentum or 3rd order sub particles are omitted as spin(2)=0,45,45.

References

Isotope masses from:
- Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
Isotopic compositions and standard atomic masses from:
- de Laeter, John Robert; Böhlke, John Karl; De Bièvre, Paul; Hidaka, Hiroshi; Peiser, H. Steffen; Rosman, Kevin J. R.; Taylor, Philip D. P. (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry. 75 (6): 683–800. doi:10.1351/pac200375060683.
- Wieser, Michael E. (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry. 78 (11): 2051–2066. doi:10.1351/pac200678112051.

"News & Notices: Standard Atomic Weights Revised". International Union of Pure and Applied Chemistry. 19 October 2005.
Half-life, spin, and isomer data selected from the following sources.
- Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
- National Nuclear Data Center. "NuDat 2.x database". Brookhaven National Laboratory.
- Holden, Norman E. (2004). "11. Table of the Isotopes". In Lide, David R. (ed.). CRC Handbook of Chemistry and Physics (85th ed.). Boca Raton, Florida: CRC Press. ISBN 978-0-8493-0485-9.

Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
"Standard Atomic Weights: Germanium". CIAAW. 2009.
Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; et al. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.
A. M. Bakalyarov; A. Ya. Balysh; S. T. Belyaev; V. I. Lebedev; S. V. Zhukov (2003). "Results of the experiment on investigation of Germanium-76 double beta decay". Physics of Particles and Nuclei Letters. 2 (2): 77–81. arXiv:hep-ex/0309016. Bibcode:2003hep.ex....9016B.
Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
Via a set of two reactions:
⁴He + ⁷²Ge → ⁷⁵Se + ¹n, ⁷⁵Se decays by electron capture to ⁷⁵As with a half-life of 120 days
⁷⁶Ge + ¹n → ⁷⁷Ge, which then undergoes beta decay to ⁷⁷As with a half-life of 11.3 hours, which in turn undergoes beta decay to ⁷⁷Se with a half-life of 39 hours
M. Agostini; et al. (2023-10-03). "Final Results of GERDA on the Two-Neutrino Double-β Decay Half-Life of ⁷⁶Ge". Physical Review Letters. American Physical Society (APS). 131 (14). doi:10.1103/physrevlett.131.142501. ISSN 0031-9007.

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[7] Ge – Excited nuclear isomer.

[8] ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.

[TMS-9] # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).

[10] Bold half-life – nearly stable, half-life longer than age of universe.

[TNN-11] # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).

[12] Modes of decay:

EC: Electron capture

IT: Isomeric transition

n: Neutron emission

p: Proton emission

[13] Bold symbol as daughter – Daughter product is stable.

[14] ( ) spin value – Indicates spin with weak assignment arguments.

[15] Used to generate ⁶⁸Ga

[16] Primordial radionuclide

[NUBASE2020-1] Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.

[2] "Standard Atomic Weights: Germanium". CIAAW. 2009.

[CIAAW2021-3] Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; et al. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN 1365-3075.

[4] A. M. Bakalyarov; A. Ya. Balysh; S. T. Belyaev; V. I. Lebedev; S. V. Zhukov (2003). "Results of the experiment on investigation of Germanium-76 double beta decay". Physics of Particles and Nuclei Letters. 2 (2): 77–81. arXiv:hep-ex/0309016. Bibcode:2003hep.ex....9016B.

[nubase2003-5] Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001

[6] Via a set of two reactions:
⁴He + ⁷²Ge → ⁷⁵Se + ¹n, ⁷⁵Se decays by electron capture to ⁷⁵As with a half-life of 120 days
⁷⁶Ge + ¹n → ⁷⁷Ge, which then undergoes beta decay to ⁷⁷As with a half-life of 11.3 hours, which in turn undergoes beta decay to ⁷⁷Se with a half-life of 39 hours

[17] M. Agostini; et al. (2023-10-03). "Final Results of GERDA on the Two-Neutrino Double-β Decay Half-Life of ⁷⁶Ge". Physical Review Letters. American Physical Society (APS). 131 (14). doi:10.1103/physrevlett.131.142501. ISSN 0031-9007.