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Isotopes of arsenic#Arsenic-76

{{Short description|none}}

{{Infobox arsenic isotopes}}

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.

List of isotopes

{{Anchor|Arsenic-60|Arsenic-60m|Arsenic-61|Arsenic-62|Arsenic-63|Arsenic-84m}}

{{Isotopes table

|symbol=As

|refs=NUBASE2020, AME2020 II

|notes=m, unc(), mass#, exen#, spin(), spin#, daughter-nst, daughter-st, EC, n, p

}}

|-id=Arsenic-64

| rowspan=2 |64As

| rowspan=2 style="text-align:right" | 33

| rowspan=2 style="text-align:right" | 31

| rowspan=2 |63.95756(22)#

| rowspan=2 |69.0(14) ms

| β+

| 64Ge

| rowspan=2 |0+#

| rowspan=2 |

|-

| β+, p?

| 63Ga

|-id=Arsenic-65

| rowspan=2 |65As

| rowspan=2 style="text-align:right" | 33

| rowspan=2 style="text-align:right" | 32

| rowspan=2 |64.949611(91)

| rowspan=2 |130.3(6) ms

| β+

| 65Ge

| rowspan=2 |3/2−#

| rowspan=2 |

|-

| β+, p?

| 64Ga

|-id=Arsenic-66

| 66As

| style="text-align:right" | 33

| style="text-align:right" | 33

| 65.9441488(61)

| 95.77(23) ms

| β+

| 66Ge

| 0+

|

|-id=Arsenic-66m1

| style="text-indent:1em" | 66m1As

| colspan="3" style="text-indent:2em" | 1356.63(17) keV

| 1.14(4) μs

| IT

| 66As

| 5+

|

|-id=Arsenic-66m2

| style="text-indent:1em" | 66m2As

| colspan="3" style="text-indent:2em" | 3023.(3) keV

| 7.98(26) μs

| IT

| 66As

| 9+

|

|-id=Arsenic-67

| 67As

| style="text-align:right" | 33

| style="text-align:right" | 34

| 66.93925111(48)

| 42.5(12) s

| β+

| 67Ge

| (5/2−)

|

|-id=Arsenic-68

| 68As

| style="text-align:right" | 33

| style="text-align:right" | 35

| 67.9367741(20)

| 151.6(8) s

| β+

| 68Ge

| 3+

|

|-id=Arsenic-68m

| style="text-indent:1em" | 68mAs

| colspan="3" style="text-indent:2em" | 425.1(2) keV

| 111(20) ns

| IT

| 68As

| 1+

|

|-id=Arsenic-69

| 69As

| style="text-align:right" | 33

| style="text-align:right" | 36

| 68.932246(34)

| 15.2(2) min

| β+

| 69Ge

| 5/2−

|

|-id=Arsenic-70

| 70As

| style="text-align:right" | 33

| style="text-align:right" | 37

| 69.9309346(15)

| 52.6(3) min

| β+

| 70Ge

| 4+

|

|-id=Arsenic-70m

| style="text-indent:1em" | 70mAs

| colspan="3" style="text-indent:2em" | 32.046(23) keV

| 96(3) μs

| IT

| 70As

| 2+

|

|-id=Arsenic-71

| 71As

| style="text-align:right" | 33

| style="text-align:right" | 38

| 70.9271136(45)

| 65.30(7) h

| β+

| 71Ge

| 5/2−

|

|-id=Arsenic-72

| 72As

| style="text-align:right" | 33

| style="text-align:right" | 39

| 71.9267523(44)

| 26.0(1) h

| β+

| 72Ge

| 2−

|

|-id=Arsenic-73

| 73As

| style="text-align:right" | 33

| style="text-align:right" | 40

| 72.9238291(41)

| 80.30(6) d

| EC

| 73Ge

| 3/2−

|

|-id=Arsenic-73m

| style="text-indent:1em" | 73mAs

| colspan="3" style="text-indent:2em" | 427.902(21) keV

| 5.7(2) μs

| IT

| 73As

| 9/2+

|

|-id=Arsenic-74

| rowspan=2|74As

| rowspan=2 style="text-align:right" | 33

| rowspan=2 style="text-align:right" | 41

| rowspan=2|73.9239286(18)

| rowspan=2|17.77(2) d

| β+ (66%)

| 74Ge

| rowspan=2|2−

| rowspan=2|

|-

| β− (34%)

| 74Se

|-id=Arsenic-75

| 75As

| style="text-align:right" | 33

| style="text-align:right" | 42

| 74.92159456(95)

| colspan=3 align=center|Stable

| 3/2−

| 1.0000

|-id=Arsenic-75m

| style="text-indent:1em" | 75mAs

| colspan="3" style="text-indent:2em" | 303.9243(8) keV

| 17.62(23) ms

| IT

| 75As

| 9/2+

|

|-id=Arsenic-76

| 76As

| style="text-align:right" | 33

| style="text-align:right" | 43

| 75.92239201(95)

| 1.0933(38) d

| β−

| 76Se

| 2−

|

|-id=Arsenic-76m

| style="text-indent:1em" | 76mAs

| colspan="3" style="text-indent:2em" | 44.425(1) keV

| 1.84(6) μs

| IT

| 76As

| (1)+

|

|-id=Arsenic-77

| 77As

| style="text-align:right" | 33

| style="text-align:right" | 44

| 76.9206476(18)

| 38.79(5) h

| β−

| 77Se

| 3/2−

|

|-id=Arsenic-77m

| style="text-indent:1em" | 77mAs

| colspan="3" style="text-indent:2em" | 475.48(4) keV

| 114.0(25) μs

| IT

| 77As

| 9/2+

|

|-id=Arsenic-78

| 78As

| style="text-align:right" | 33

| style="text-align:right" | 45

| 77.921828(10)

| 90.7(2) min

| β−

| 78Se

| 2−

|

|-id=Arsenic-79

| 79As

| style="text-align:right" | 33

| style="text-align:right" | 46

| 78.9209484(57)

| 9.01(15) min

| β−

| 79Se

| 3/2−

|

|-id=Arsenic-79m

| style="text-indent:1em" | 79mAs

| colspan="3" style="text-indent:2em" | 772.81(6) keV

| 1.21(1) μs

| IT

| 79As

| (9/2)+

|

|-id=Arsenic-80

| 80As

| style="text-align:right" | 33

| style="text-align:right" | 47

| 79.9224744(36)

| 15.2(2) s

| β−

| 80Se

| 1+

|

|-id=Arsenic-81

| 81As

| style="text-align:right" | 33

| style="text-align:right" | 48

| 80.9221323(28)

| 33.3(8) s

| β−

| 81Se

| 3/2−

|

|-id=Arsenic-82

| 82As

| style="text-align:right" | 33

| style="text-align:right" | 49

| 81.9247387(40)

| 19.1(5) s

| β−

| 82Se

| (2−)

|

|-id=Arsenic-82m

| style="text-indent:1em" | 82mAs

| colspan="3" style="text-indent:2em" | 131.6(5) keV

| 13.6(4) s

| β−

| 82Se

| (5-)

|

|-id=Arsenic-83

| 83As

| style="text-align:right" | 33

| style="text-align:right" | 50

| 82.9252069(30)

| 13.4(4) s

| β−

| 83Se

| 5/2−#

|

|-id=Arsenic-84

| rowspan=2|84As

| rowspan=2 style="text-align:right" | 33

| rowspan=2 style="text-align:right" | 51

| rowspan=2|83.9293033(34)

| rowspan=2|3.16(58) s

| β− (99.72%)

| 84Se

| rowspan=2|(2−)

| rowspan=2|

|-

| β−, n (.28%)

| 83Se

|-id=Arsenic-85

| rowspan=2|85As

| rowspan=2 style="text-align:right" | 33

| rowspan=2 style="text-align:right" | 52

| rowspan=2|84.9321637(33)

| rowspan=2|2.022(7) s

| β−, n (62.6%)

| 84Se

| rowspan=2|(5/2−)

| rowspan=2|

|-

| β− (37.4%)

| 85Se

|-id=Arsenic-86

| rowspan=3|86As

| rowspan=3 style="text-align:right" | 33

| rowspan=3 style="text-align:right" | 53

| rowspan=3|85.9367015(37)

| rowspan=3|945(8) ms

| β− (64.5%)

| 86Se

| rowspan=3|(1−,2−)

| rowspan=3|

|-

| β−, n (35.5%)

| 85Se

|-

| β−, 2n?

| 84Se

|-id=Arsenic-87

| rowspan=3|87As

| rowspan=3 style="text-align:right" | 33

| rowspan=3 style="text-align:right" | 54

| rowspan=3|86.9402917(32)

| rowspan=3|492(25) ms

| β− (84.6%)

| 87Se

| rowspan=3|(5/2−,3/2−)

| rowspan=3|

|-

| β−, n (15.4%)

| 86Se

|-

| β−, 2n?

| 85Se

|-id=Arsenic-88

| rowspan=2|88As

| rowspan=2 style="text-align:right" | 33

| rowspan=2 style="text-align:right" | 55

| rowspan=2|87.94584(22)#

| rowspan=2|270(150) ms

| β−

| 88Se

| rowspan=2|

| rowspan=2|

|-

| β−, n?

| 87Se

|-id=Arsenic-89

| rowspan=3|89As

| rowspan=3 style="text-align:right" | 33

| rowspan=3 style="text-align:right" | 56

| rowspan=3|88.95005(32)#

| rowspan=3|220# ms [>150 ns]

| β−?

| 89Se

| rowspan=3|5/2−#

| rowspan=3|

|-

| β−, n?

| 88Se

|-

| β−, 2n?

| 87Se

|-id=Arsenic-90

| rowspan=3|90As

| rowspan=3 style="text-align:right" | 33

| rowspan=3 style="text-align:right" | 57

| rowspan=3|89.95600(43)#

| rowspan=3|70# ms [>300 ns]

| β−?

| 90Se

| rowspan=3|

| rowspan=3|

|-

| β−, n?

| 89Se

|-

| β−, 2n?

| 88Se

|-id=Arsenic-90m

| style="text-indent:1em" | 90mAs

| colspan="3" style="text-indent:2em" | 124.5(5) keV

| 220(100) ns

| IT

| 90As

|

|

|-id=Arsenic-91

| rowspan=3|91As

| rowspan=3 style="text-align:right" | 33

| rowspan=3 style="text-align:right" | 58

| rowspan=3|90.96082(43)#

| rowspan=3|100# ms [>300 ns]

| β−?

| 91Se

| rowspan=3|5/2−#

| rowspan=3|

|-

| β−, n?

| 90Se

|-

| β−, 2n?

| 89Se

|-id=Arsenic-92

| rowspan=3|92As

| rowspan=3 style="text-align:right" | 33

| rowspan=3 style="text-align:right" | 59

| rowspan=3|91.96739(54)#

| rowspan=3|45# ms [>300 ns]

| β−?

| 92Se

| rowspan=3|

| rowspan=3|

|-

| β−, n?

| 91Se

|-

| β−, 2n?

| 90Se

|-id=Arsenic-93

| 93As{{cite journal |last1=Shimizu |first1=Y. |last2=Kubo |first2=T. |last3=Sumikama |first3=T. |last4=Fukuda |first4=N. |last5=Takeda |first5=H. |last6=Suzuki |first6=H. |last7=Ahn |first7=D. S. |last8=Inabe |first8=N. |last9=Kusaka |first9=K. |last10=Ohtake |first10=M. |last11=Yanagisawa |first11=Y. |last12=Yoshida |first12=K. |last13=Ichikawa |first13=Y. |last14=Isobe |first14=T. |last15=Otsu |first15=H. |last16=Sato |first16=H. |last17=Sonoda |first17=T. |last18=Murai |first18=D. |last19=Iwasa |first19=N. |last20=Imai |first20=N. |last21=Hirayama |first21=Y. |last22=Jeong |first22=S. C. |last23=Kimura |first23=S. |last24=Miyatake |first24=H. |last25=Mukai |first25=M. |last26=Kim |first26=D. G. |last27=Kim |first27=E. |last28=Yagi |first28=A. |title=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 |journal=Physical Review C |date=8 April 2024 |volume=109 |issue=4 |doi=10.1103/PhysRevC.109.044313}}

| style="text-align:right" | 33

| style="text-align:right" | 60

|

|

|

|

|

|

|-id=Arsenic-94

| 94As

| style="text-align:right" | 33

| style="text-align:right" | 61

|

|

|

|

|

|

|-id=Arsenic-95

| 95As

| style="text-align:right" | 33

| style="text-align:right" | 62

|

|

|

|

|

|

{{Isotopes table/footer}}

References

{{Reflist}}

  • Isotope masses from:
  • {{NUBASE 2003}}
  • Half-life, spin, and isomer data selected from the following sources.
  • {{NUBASE 2003}}
  • {{NNDC}}
  • {{CRC85|chapter=11}}
  • A.Shore, A. Fritsch, M. Heim, A. Schuh, M. Thoennessen. Discovery of the Arsenic Isotopes. [https://arxiv.org/abs/0902.4361 arXiv:0902.4361].

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Category:Arsenic

Arsenic