Isotopes of arsenic - Reference.org

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Isotopes of arsenic

Arsenic (33As) has 32 known isotopes and at least 10 isomers. Only one of these isotopes, 75As, is stable; as such, it is considered a monoisotopic element. The longest-lived radioisotope is 73As with a half-life of 80 days.

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List of isotopes

Nuclide¹	Z	N	Isotopic mass (Da)² ³ ⁴	Half-life ⁵	Decaymode ⁶ ⁷	Daughterisotope ⁸ ⁹	Spin andparity ¹⁰ ¹¹ ¹²	Isotopicabundance
Nuclide¹	Excitation energy¹³			Half-life ⁵	Decaymode ⁶ ⁷	Daughterisotope ⁸ ⁹	Spin andparity ¹⁰ ¹¹ ¹²	Isotopicabundance
64As	33	31	63.95756(22)#	69.0(14) ms	β+	64Ge	0+#
64As	33	31	63.95756(22)#	69.0(14) ms	β+, p?	63Ga	0+#
65As	33	32	64.949611(91)	130.3(6) ms	β+	65Ge	3/2−#
65As	33	32	64.949611(91)	130.3(6) ms	β+, p?	64Ga	3/2−#
66As	33	33	65.9441488(61)	95.77(23) ms	β+	66Ge	0+
66m1As	1356.63(17) keV			1.14(4) μs	IT	66As	5+
66m2As	3023.(3) keV			7.98(26) μs	IT	66As	9+
67As	33	34	66.93925111(48)	42.5(12) s	β+	67Ge	(5/2−)
68As	33	35	67.9367741(20)	151.6(8) s	β+	68Ge	3+
68mAs	425.1(2) keV			111(20) ns	IT	68As	1+
69As	33	36	68.932246(34)	15.2(2) min	β+	69Ge	5/2−
70As	33	37	69.9309346(15)	52.6(3) min	β+	70Ge	4+
70mAs	32.046(23) keV			96(3) μs	IT	70As	2+
71As	33	38	70.9271136(45)	65.30(7) h	β+	71Ge	5/2−
72As	33	39	71.9267523(44)	26.0(1) h	β+	72Ge	2−
73As	33	40	72.9238291(41)	80.30(6) d	EC	73Ge	3/2−
73mAs	427.902(21) keV			5.7(2) μs	IT	73As	9/2+
74As	33	41	73.9239286(18)	17.77(2) d	β+ (66%)	74Ge	2−
74As	33	41	73.9239286(18)	17.77(2) d	β− (34%)	74Se	2−
75As	33	42	74.92159456(95)	Stable			3/2−	1.0000
75mAs	303.9243(8) keV			17.62(23) ms	IT	75As	9/2+
76As	33	43	75.92239201(95)	1.0933(38) d	β−	76Se	2−
76mAs	44.425(1) keV			1.84(6) μs	IT	76As	(1)+
77As	33	44	76.9206476(18)	38.79(5) h	β−	77Se	3/2−
77mAs	475.48(4) keV			114.0(25) μs	IT	77As	9/2+
78As	33	45	77.921828(10)	90.7(2) min	β−	78Se	2−
79As	33	46	78.9209484(57)	9.01(15) min	β−	79Se	3/2−
79mAs	772.81(6) keV			1.21(1) μs	IT	79As	(9/2)+
80As	33	47	79.9224744(36)	15.2(2) s	β−	80Se	1+
81As	33	48	80.9221323(28)	33.3(8) s	β−	81Se	3/2−
82As	33	49	81.9247387(40)	19.1(5) s	β−	82Se	(2−)
82mAs	131.6(5) keV			13.6(4) s	β−	82Se	(5-)
83As	33	50	82.9252069(30)	13.4(4) s	β−	83Se	5/2−#
84As	33	51	83.9293033(34)	3.16(58) s	β− (99.72%)	84Se	(2−)
84As	33	51	83.9293033(34)	3.16(58) s	β−, n (.28%)	83Se	(2−)
85As	33	52	84.9321637(33)	2.022(7) s	β−, n (62.6%)	84Se	(5/2−)
85As	33	52	84.9321637(33)	2.022(7) s	β− (37.4%)	85Se	(5/2−)
86As	33	53	85.9367015(37)	945(8) ms	β− (64.5%)	86Se	(1−,2−)
					β−, n (35.5%)	85Se
					β−, 2n?	84Se
87As	33	54	86.9402917(32)	492(25) ms	β− (84.6%)	87Se	(5/2−,3/2−)
					β−, n (15.4%)	86Se
					β−, 2n?	85Se
88As	33	55	87.94584(22)#	270(150) ms	β−	88Se
88As	33	55	87.94584(22)#	270(150) ms	β−, n?	87Se
89As	33	56	88.95005(32)#	220# ms [>150 ns]	β−?	89Se	5/2−#
					β−, n?	88Se
					β−, 2n?	87Se
90As	33	57	89.95600(43)#	70# ms [>300 ns]	β−?	90Se
					β−, n?	89Se
					β−, 2n?	88Se
90mAs	124.5(5) keV			220(100) ns	IT	90As
91As	33	58	90.96082(43)#	100# ms [>300 ns]	β−?	91Se	5/2−#
					β−, n?	90Se
					β−, 2n?	89Se
92As	33	59	91.96739(54)#	45# ms [>300 ns]	β−?	92Se
					β−, n?	91Se
					β−, 2n?	90Se
93As¹⁴	33	60
94As¹⁵	33	61
95As¹⁶	33	62
This table header & footer: view

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
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.
A.Shore, A. Fritsch, M. Heim, A. Schuh, M. Thoennessen. Discovery of the Arsenic Isotopes. arXiv:0902.4361.

References

mAs – 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 ↩
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 capturen:Neutron emissionp:Proton emission /wiki/Electron_capture ↩
Bold italics symbol as daughter – Daughter product is nearly stable. ↩
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). ↩
# – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN). ↩
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) ↩
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) ↩