Isotopes of germanium - Reference.org

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Isotopes of germanium

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 (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%.

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 59Ge with a half-life of 13.3 ms.

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

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

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List of isotopes

Nuclide⁵	Z	N	Isotopic mass (Da)⁶ ⁷ ⁸	Half-life ⁹ ¹⁰ ¹¹	Decaymode ¹² ¹³	Daughterisotope ¹⁴	Spin andparity ¹⁵ ¹⁶ ¹⁷	Natural abundance (mole fraction)
Nuclide⁵	Excitation energy			Half-life ⁹ ¹⁰ ¹¹	Decaymode ¹² ¹³	Daughterisotope ¹⁴	Spin andparity ¹⁵ ¹⁶ ¹⁷	Normal proportion¹⁸	Range of variation
59Ge	32	27	58.98243(43)#	13.3(17) ms	β+, p (93%)	58Zn	7/2−#
					β+ (7%)	59Ga
					2p (<0.2%)	57Zn
60Ge	32	28	59.97045(32)#	21(6) ms	β+, p	59Zn	0+
60Ge	32	28	59.97045(32)#	21(6) ms	β+, 2p (<14%)	58Cu	0+
61Ge	32	29	60.96373(32)#	40.7(4) ms	β+, p (87%)	60Zn	3/2−#
61Ge	32	29	60.96373(32)#	40.7(4) ms	β+ (18%)	61Ga	3/2−#
62Ge	32	30	61.95476(15)#	82.5(14) ms	β+	62Ga	0+
63Ge	32	31	62.949628(40)	153.6(11) ms	β+	63Ga	3/2−#
64Ge	32	32	63.9416899(40)	63.7(25) s	β+	64Ga	0+
65Ge	32	33	64.9393681(23)	30.9(5) s	β+ (99.99%)	65Ga	3/2−
65Ge	32	33	64.9393681(23)	30.9(5) s	β+, p (0.011%)	64Zn	3/2−
66Ge	32	34	65.9338621(26)	2.26(5) h	β+	66Ga	0+
67Ge	32	35	66.9327170(46)	18.9(3) min	β+	67Ga	1/2−
67m1Ge	18.20(5) keV			13.7(9) μs	IT	67Ge	5/2−
67m2Ge	751.70(6) keV			109.1(38) ns	IT	67Ge	9/2+
68Ge¹⁹	32	36	67.9280953(20)	271.05(8) d	EC	68Ga	0+
69Ge	32	37	68.9279645(14)	39.05(10) h	β+	69Ga	5/2−
69m1Ge	86.76(2) keV			5.1(2) μs	IT	69Ge	1/2−
69m2Ge	397.94(2) keV			2.81(5) μs	IT	69Ge	9/2+
70Ge	32	38	69.92424854(88)	Stable			0+	0.2052(19)
71Ge	32	39	70.92495212(87)	11.468(8) d²⁰	EC	71Ga	1/2−
71mGe	198.354(14) keV			20.41(18) ms	IT	71Ge	9/2+
72Ge	32	40	71.922075824(81)	Stable			0+	0.2745(15)
72mGe	691.43(4) keV			444.2(8) ns	IT	72Ge	0+
73Ge	32	41	72.923458954(61)	Stable			9/2+	0.0776(8)
73m1Ge	13.2845(15) keV			2.91(3) μs	IT	73Ge	5/2+
73m2Ge	66.725(9) keV			499(11) ms	IT	73Ge	1/2−
74Ge	32	42	73.921177760(13)	Stable			0+	0.3652(12)
75Ge	32	43	74.922858370(55)	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− (0.030%)	75As	7/2+
75m2Ge	192.19(6) keV			216(5) ns	IT	75Ge	5/2+
76Ge²¹	32	44	75.921402725(19)	(2.022±0.018±0.038)×1021 y²²	β−β−	76Se	0+	0.0775(12)
77Ge	32	45	76.923549843(56)	11.211(3) h	β−	77As	7/2+
77mGe	159.71(6) keV			53.7(6) s	β− (81%)	77As	1/2−
77mGe	159.71(6) keV			53.7(6) s	IT (19%)	77Ge	1/2−
78Ge	32	46	77.9228529(38)	88.0(10) min	β−	78As	0+
79Ge	32	47	78.925360(40)	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	79.9253508(22)	29.5(4) s	β−	80As	0+
81Ge	32	49	80.9288329(22)	9(2) s	β−	81As	9/2+#
81mGe	679.14(4) keV			6(2) s	β−	81As	(1/2+)
81mGe	679.14(4) keV			6(2) s	IT (<1%)	81Ge	(1/2+)
82Ge	32	50	81.9297740(24)	4.31(19) s	β−	82As	0+
83Ge	32	51	82.9345391(26)	1.85(6) s	β−	83As	(5/2+)
84Ge	32	52	83.9375751(34)	951(9) ms	β− (89.4%)	84As	0+
84Ge	32	52	83.9375751(34)	951(9) ms	β−, n (10.6%)	83As	0+
85Ge	32	53	84.9429697(40)	495(5) ms	β− (82.8%)	85As	(3/2+,5/2+)#
85Ge	32	53	84.9429697(40)	495(5) ms	β−, n (17.2%)	84As	(3/2+,5/2+)#
86Ge	32	54	85.94697(47)	221.6(11) ms	β− (55%)	86As	0+
86Ge	32	54	85.94697(47)	221.6(11) ms	β−, n (45%)	85As	0+
87Ge	32	55	86.95320(32)#	103(4) ms	β−	87As	5/2+#
88Ge	32	56	87.95757(43)#	61(6) ms	β−	88As	0+
89Ge	32	57	88.96453(43)#	60# ms [>300 ns]			3/2+#
90Ge	32	58	89.96944(54)#	30# ms [>400 ns]			0+
91Ge²³	32	59
92Ge²⁴	32	60
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References

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. /wiki/ArXiv_(identifier) ↩
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 /wiki/Aaldert_Wapstra ↩
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 /wiki/Aaldert_Wapstra ↩
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 /wiki/Aaldert_Wapstra ↩
mGe – Excited nuclear isomer. /wiki/Nuclear_isomer ↩
Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*". Chinese Physics C. 45 (3): 030003. doi:10.1088/1674-1137/abddaf. /wiki/Doi_(identifier) ↩
( ) – 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). ↩
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. https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf ↩
Bold half-life – nearly stable, half-life longer than age of universe. /wiki/Age_of_universe ↩
# – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN). ↩
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. https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf ↩
Modes of decay: EC:Electron captureIT:Isomeric transitionn:Neutron emissionp:Proton emission /wiki/Electron_capture ↩
Bold symbol as daughter – Daughter product is stable. ↩
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. https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf ↩
( ) spin value – Indicates spin with weak assignment arguments. ↩
# – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN). ↩
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. https://www-nds.iaea.org/amdc/ame2020/NUBASE2020.pdf ↩
Used to generate 68Ga /wiki/Gallium-68_generator ↩
Norman, E. B.; Drobizhev, A.; Gharibyan, N.; Gregorich, K. E.; Kolomensky, Yu. G.; Sammis, B. N.; Scielzo, N. D.; Shusterman, J. A.; Thomas, K. J. (30 May 2024). "Half-life of Ge 71 and the gallium anomaly". Physical Review C. 109 (5). doi:10.1103/PhysRevC.109.055501. /wiki/Doi_(identifier) ↩
Primordial radionuclide /wiki/Primordial_nuclide ↩
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. 131 (14). American Physical Society (APS): 142501. arXiv:2308.09795. Bibcode:2023PhRvL.131n2501A. doi:10.1103/physrevlett.131.142501. ISSN 0031-9007. PMID 37862664. S2CID 261049638. https://doi.org/10.1103%2Fphysrevlett.131.142501 ↩
Shimizu, Y.; Kubo, T.; Sumikama, T.; Fukuda, N.; Takeda, H.; Suzuki, H.; Ahn, D. S.; Inabe, N.; Kusaka, K.; Ohtake, M.; Yanagisawa, Y.; Yoshida, K.; Ichikawa, Y.; Isobe, T.; Otsu, H.; Sato, H.; Sonoda, T.; Murai, D.; Iwasa, N.; Imai, N.; Hirayama, Y.; Jeong, S. C.; Kimura, S.; Miyatake, H.; Mukai, M.; Kim, D. G.; Kim, E.; Yagi, A. (8 April 2024). "Production of new neutron-rich isotopes near the N = 60 isotones Ge 92 and As 93 by in-flight fission of a 345 MeV/nucleon U 238 beam". Physical Review C. 109 (4). doi:10.1103/PhysRevC.109.044313. /wiki/Doi_(identifier) ↩
Shimizu, Y.; Kubo, T.; Sumikama, T.; Fukuda, N.; Takeda, H.; Suzuki, H.; Ahn, D. S.; Inabe, N.; Kusaka, K.; Ohtake, M.; Yanagisawa, Y.; Yoshida, K.; Ichikawa, Y.; Isobe, T.; Otsu, H.; Sato, H.; Sonoda, T.; Murai, D.; Iwasa, N.; Imai, N.; Hirayama, Y.; Jeong, S. C.; Kimura, S.; Miyatake, H.; Mukai, M.; Kim, D. G.; Kim, E.; Yagi, A. (8 April 2024). "Production of new neutron-rich isotopes near the N = 60 isotones Ge 92 and As 93 by in-flight fission of a 345 MeV/nucleon U 238 beam". Physical Review C. 109 (4). doi:10.1103/PhysRevC.109.044313. /wiki/Doi_(identifier) ↩