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Isotopes of arsenic

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Arsenic occurs naturally as one stable isotope, 75As, so is monoisotopic and mononuclidic. Synthetic radioisotopes are known from 64As to 95As, as well as at least 11 isomers.

The most stable of these are 73As with a half-life of 80.30 days and 74As with a half-life of 17.77 days, followed by 71As (65.30 hours), 77As (38.79 hours), 76As (26.24 hours), and 72As (26.0 hours). All others outside this range of mass number 71-77 have half-lives under 100 minutes and most under one minute. The longest-lived of the isomers is 82mAs at 13.6 seconds.

Isotopes lighter than the stable one generally decay by positron emission or electron capture to germanium isotopes, while those heavier beta decay to selenium isotopes. A notable exception is that 74As decays both ways.

List of isotopes

Arsenic-60

|-id=Arsenic-63 | 63As | | | | | | |-id=Arsenic-64 | β+

64Ge
β+, p?
63Ga
-id=Arsenic-65
β+
65Ge
-
β+, p?
64Ga
-id=Arsenic-66
66As
65.9441488(61)
95.77(23) ms
β+
66Ge
0+

| |-id=Arsenic-66m1 | 1.14(4) μs | IT | 66As | 5+ | |-id=Arsenic-66m2 | 7.98(26) μs | IT | 66As | 9+ | |-id=Arsenic-67 | 67As | 66.93925111(48) | 42.5(12) s | β+ | 67Ge | (5/2−) | |-id=Arsenic-68 | 68As | 67.9367741(20) | 151.6(8) s | β+ | 68Ge | 3+ | |-id=Arsenic-68m | 111(20) ns | IT | 68As | 1+ | |-id=Arsenic-69 | 69As | 68.932246(34) | 15.2(2) min | β+ | 69Ge | 5/2− | |-id=Arsenic-70 | 70As | 69.9309346(15) | 52.6(3) min | β+ | 70Ge | 4+ | |-id=Arsenic-70m | 96(3) μs | IT | 70As | 2+ | |-id=Arsenic-71 | 71As | 70.9271136(45) | 65.30(7) h | β+ | 71Ge | 5/2− | |-id=Arsenic-72 | 72As | 71.9267523(44) | 26.0(1) h | β+ | 72Ge | 2− | |-id=Arsenic-73 | 73As | 72.9238291(41) | 80.30(6) d | EC | 73Ge | 3/2− | |-id=Arsenic-73m | 5.7(2) μs | IT | 73As | 9/2+ | |-id=Arsenic-74 | β+ (66%)

74Ge
β− (34%)
74Se
-id=Arsenic-75
75As
74.92159456(95)
3/2−
1.0000
-id=Arsenic-75m
17.62(23) ms
IT
75As
9/2+

| |-id=Arsenic-76 | 76As | 75.92239201(95) | 1.0933(38) d | β− | 76Se | 2− | |-id=Arsenic-76m | 1.84(6) μs | IT | 76As | (1)+ | |-id=Arsenic-77 | 77AsFission product | 76.9206476(18) | 38.79(5) h | β− | 77Se | 3/2− | |-id=Arsenic-77m | 114.0(25) μs | IT | 77As | 9/2+ | |-id=Arsenic-78 | 78As | 77.921828(10) | 90.7(2) min | β− | 78Se | 2− | |-id=Arsenic-79 | 79As | 78.9209484(57) | 9.01(15) min | β− | 79Se | 3/2− | |-id=Arsenic-79m | 1.21(1) μs | IT | 79As | (9/2)+ | |-id=Arsenic-80 | 80As | 79.9224744(36) | 15.2(2) s | β− | 80Se | 1+ | |-id=Arsenic-81 | 81As | 80.9221323(28) | 33.3(8) s | β− | 81Se | 3/2− | |-id=Arsenic-82 | 82As | 81.9247387(40) | 19.1(5) s | β− | 82Se | (2−) | |-id=Arsenic-82m | 13.6(4) s | β− | 82Se | (5-) | |-id=Arsenic-83 | 83As | 82.9252069(30) | 13.4(4) s | β− | 83Se | 5/2−# | |-id=Arsenic-84 | β− (99.72%)

84Se
β−, n (.28%)
83Se
-id=Arsenic-85
β−, n (62.6%)
84Se
-
β− (37.4%)
85Se
-id=Arsenic-86
β− (64.5%)
86Se
-
β−, n (35.5%)
85Se
-
β−, 2n?
84Se
-id=Arsenic-87
β− (84.6%)
87Se
-
β−, n (15.4%)
86Se
-
β−, 2n?
85Se
-id=Arsenic-88
β−
88Se
-
β−, n?
87Se
-id=Arsenic-89
β−?
89Se
-
β−, n?
88Se
-
β−, 2n?
87Se
-id=Arsenic-90
β−?
90Se
-
β−, n?
89Se
-
β−, 2n?
88Se
-id=Arsenic-90m
220(100) ns
IT
90As

| | |-id=Arsenic-91 | β−?

91Se
β−, n?
90Se
-
β−, 2n?
89Se
-id=Arsenic-92
β−?
92Se
-
β−, n?
91Se
-
β−, 2n?
90Se
-id=Arsenic-93
93As

| | | | | | |-id=Arsenic-94 | 94As | | | | | | |-id=Arsenic-95 | 95As | | | | | |

References

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

References

  1. (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.
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