Isotopes of antimony

Template:Infobox antimony isotopes Antimony (51Sb) occurs naturally as two stable isotopes, 121Sb (57.21%) and 123Sb (42.79%). There are 37 artificial radioactive isotopes known with mass numbers 104 to 142, the lightest two of which (104-105Sb) are beyond the proton drip line. Isotopes that are lighter than the stable isotopes tend to decay by β+, and those that are heavier tend to decay by β−; the intermediate 122Sb is observed to decay in both ways.

The longest-lived radioisotopes of antimony are: the minor fission product 125Sb, with a half-life of 2.758 years; 124Sb, with half-life 60.20 days; and 126Sb, with half-life 12.35 days. All other isotopes have half-lives less than 4 days, most less than an hour. Of the numerous isomers reported, the longest-lived is 120m1Sb with half-life 5.76 days; this nuclide has not been confirmed not to be the ground state.

## List of isotopes

Nuclide
[n 1] | Z | N | Isotopic mass (u)
[n 2][n 3] | Half-life
| Decay
mode
[n 4] | Daughter
isotope
[n 5][n 6] | Spin and
parity
[n 7][n 8] | Physics:Natural abundance (mole fraction)

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Excitation energy[n 8] | Normal proportion  | Range of variation
104Sb  | 51  | 53  | 103.936331(24)[1] | 1995 | 470(130) ms  | β+?  | 104Sn  |  |  |
p (<7%)  | 103Sn
β+, p (<7%)  | 103In
α?  | 100In
105Sb  | 51  | 54  | 104.931277(23)  | 1994 | 1.12(16) s  | β+ (>99.9%)  | 105Sn  | (5/2+)  |  |
p (<0.1%)  | 104Sn
β+, p?  | 104In
106Sb  | 51  | 55  | 105.9286380(80)  | 1981 | 0.6(2) s  | β+ | 106Sn  | (2+)  |  |
106mSb  | 103.5(3) keV  | 1999 | 226(14) ns  | IT  | 106Sb  | (4+)  |  |
107Sb  | 51  | 56  | 106.9241506(45)  | 1994 | 4.0(2) s  | β+ | 107Sn  | 5/2+#  |  |
108Sb  | 51  | 57  | 107.9222267(59)  | 1976 | 7.4(3) s  | β+ | 108Sn  | (4+)  |  |
109Sb  | 51  | 58  | 108.9181412(57)  | 1976 | 17.2(5) s  | β+ | 109Sn  | 5/2+#  |  |
110Sb  | 51  | 59  | 109.9168543(64)  | 1972 | 23.6(3) s  | β+ | 110Sn  | (3+)  |  |
111Sb  | 51  | 60  | 110.9132182(95)  | 1972 | 75(1) s  | β+ | 111Sn  | (5/2+)  |  |
112Sb  | 51  | 61  | 111.912400(19)  | 1959 | 53.5(6) s  | β+ | 112Sn | (3+)  |  |
112mSb  | 825.9(4) keV  | 1976 | 536(22) ns  | IT  | 112Sb  | (8−)  |  |
113Sb  | 51  | 62  | 112.909375(18)  | 1958 | 6.67(7) min  | β+ | 113Sn  | 5/2+  |  |
114Sb  | 51  | 63  | 113.909289(21)  | 1959 | 3.49(3) min  | β+ | 114Sn | 3+  |  |
114mSb  | 495.5(7) keV  | 1973 | 219(12) μs  | IT  | 114Sb  | (8−)  |  |
115Sb  | 51  | 64  | 114.906598(17)  | 1958 | 32.1(3) min  | β+ | 115Sn | 5/2+  |  |
115mSb  | 2796.26(9) keV  | 1977 | 159(3) ns  | IT  | 115Sb  | (19/2)−  |  |
116Sb  | 51  | 65  | 115.9067927(55)  | 1949 | 15.8(8) min  | β+ | 116Sn | 3+  |  |
116m1Sb  | 93.99(5) keV  | 1976 | 194(4) ns  | IT  | 116Sb  | 1+  |  |
116m2Sb  | 390(40) keV  | 1954 | 60.3(6) min  | β+ | 116Sn | 8−  |  |
117Sb  | 51  | 66  | 116.9048415(91)  | 1947 | 2.97(2) h  | β+ | 117Sn | 5/2+  |  |
117m1Sb  | 3130.76(19) keV  | 1970 | 355(17) μs  | IT  | 117Sb  | (25/2)+  |  |
117m2Sb  | 3230.7(2) keV  | 1987 | 290(5) ns  | IT  | 117Sb  | (23/2−)  |  |
118Sb  | 51  | 67  | 117.9055322(32)  | 1947 | 3.6(1) min  | β+ | 118Sn | 1+  |  |
118m1Sb  | 50.814(21) keV  | 1975 | 20.6(6) μs  | IT  | 118Sb  | 3+  |  |
118m2Sb  | 250(6) keV  | 1948 | 5.01(3) h  | β+ | 118Sn | 8−  |  |
119Sb  | 51  | 68  | 118.9039441(75)  | 1947 | 38.19(22) h  | EC | 119Sn | 5/2+  |  |
119m1Sb  | 2553.6(3) keV  | 1987 | 130(3) ns  | IT  | 119Sb  | 19/2−  |  |
119m2Sb  | 2841.7(4) keV  | 1979 | 835(81) ms  | IT  | 119Sb  | 25/2+  |  |
120Sb  | 51  | 69  | 119.9050803(77)  | 1937 | 15.89(4) min  | β+ | 120Sn | 1+  |  |
120m1Sb[n 9] | 0(100)# keV  | 1948 | 5.76(2) d  | β+ | 120Sn | 8−  |  |
120m2Sb  | 78.16(5) keV  | 1976 | 246(2) ns  | IT  | 120Sb  | (3+)  |  |
120m3Sb  | 2328(100)# keV  | 1987 | 400(8) ns  | IT  | 120Sb  | 13+  |  |
121Sb[n 10] | 51  | 70  | 120.9038114(27)  | 1922 | Stable | 5/2+  | 0.5721(5)  |
121mSb  | 2751(17) keV  | 2009 | 179(6) μs  | IT  | 121Sb | (25/2+)  |  |
122Sb  | 51  | 71  | 121.9051693(27)  | 1939 | 2.7238(2) d  | β− (97.59%)  | 122Te | 2−  |  |
β+ (2.41%)  | 122Sn
122m1Sb  | 61.4131(5) keV  | 1962 | 1.86(8) μs  | IT  | 122Sb  | 3+  |  |
122m2Sb  | 137.4726(8) keV  | 1962 | 0.53(3) ms  | IT  | 122Sb  | 5+  |  |
122m3Sb  | 163.5591(17) keV  | 1947 | 4.191(3) min  | IT  | 122Sb  | 8−  |  |
123Sb[n 10] | 51  | 72  | 122.9042153(15)  | 1922 | Stable | 7/2+  | 0.4279(5)  |
123m1Sb  | 2237.8(3) keV  | 2008 | 214(3) ns  | IT  | 123Sb | 19/2−  |  |
123m2Sb  | 2613.4(4) keV  | 2007 | 65(1) μs  | IT  | 123Sb | 23/2+  |  |
124Sb  | 51  | 73  | 123.9059371(15)  | 1939 | 60.20(3) d  | β− | 124Te | 3−  |  |
124m1Sb  | 10.8627(8) keV  | 1947 | 93(5) s  | IT (75%)  | 124Sb  | 5+  |  |
β− (25%)  | 124Te
124m2Sb  | 36.8440(14) keV  | 1947 | 20.2(2) min  | IT  | 124m1Sb  | (8)−  |  |
124m3Sb  | 40.8038(7) keV  | 1980 | 3.2(3) μs  | IT  | 124Sb  | (3+)  |  |
125Sb[n 10] | 51  | 74  | 124.9052543(27)  | 1951 | 2.7576(11) y  | β− | 125Te | 7/2+  |  |
125m1Sb  | 1971.25(20) keV  | 2007 | 4.1(2) μs  | IT  | 125Sb  | 15/2−  |  |
125m2Sb  | 2112.1(3) keV  | 2007 | 28.5(5) μs  | IT  | 125Sb  | 19/2−  |  |
125m3Sb  | 2471.0(4) keV  | 2007 | 277.0(64) ns  | IT  | 125Sb  | (23/2)+  |  |
126Sb  | 51  | 75  | 125.907253(34)  | 1956 | 12.35(6) d  | β− | 126Te | 8−  |  |
126m1Sb  | 17.7(3) keV  | 1961 | 19.15(8) min  | β− (86%)  | 126Te | 5+  |  |
IT (14%)  | 126Sb
126m2Sb  | 40.4(3) keV  | 1976 | ~11 s  | IT  | 126m1Sb  | 3−  |  |
126m3Sb  | 104.6(3) keV  | 1971 | 553(5) ns  | IT  | 126Sb  | 3+  |  |
126m4Sb  | 1810.7(17) keV  | 2019 | 90(16) ns  | IT  | 126Sb  | (13+)  |  |
127Sb[n 10] | 51  | 76  | 126.9069256(55)  | 1939 | 3.85(5) d  | β− | 127Te  | 7/2+  |  |
127m1Sb  | 1920.19(21) keV  | 1974 | 11.7(1) μs  | IT  | 127Sb  | 15/2−  |  |
127m2Sb  | 2324.7(4) keV  | 2005 | 269(5) ns  | IT  | 127Sb  | 23/2+  |  |
128Sb  | 51  | 77  | 127.909146(20)  | 1956 | 9.05(4) h  | β− | 128Te | 8−  |  |
128m1Sb  | 10(6) keV  | 1956 | 10.41(18) min  | β− (96.4%)  | 128Te | 5+  |  |
IT (3.6%)  | 128Sb
128m2Sb  | 1617.3(7) keV  | 2019 | 500(20) ns  | IT  | 128Sb  | (11+)  |  |
128m3Sb  | 1769.9(12) keV  | 2019 | 217(7) ns  | IT  | 128Sb  | (13+)  |  |
129Sb  | 51  | 78  | 128.909147(23)  | 1939 | 4.366(26) h  | β− | 129Te  | 7/2+  |  |
129m1Sb  | 1851.31(6) keV  | 1982 | 17.7(1) min  | β− (85%)  | 129Te  | 19/2−  |  |
IT (15%)  | 129Sb
129m2Sb  | 1861.06(5) keV  | 1987 | 2.23(17) μs  | IT  | 129Sb  | 15/2−  |  |
129m3Sb  | 2139.4(3) keV  | 2003 | 0.89(3) μs  | IT  | 129Sb  | 23/2+  |  |
130Sb  | 51  | 79  | 129.911663(15)  | 1962 | 39.5(8) min  | β− | 130Te | 8−  |  |
130m1Sb  | 4.80(20) keV  | 1962 | 6.3(2) min  | β− | 130Te | 4+  |  |
130m2Sb  | 84.67(4) keV  | 2002 | 800(100) ns  | IT  | 130Sb  | 6−  |  |
130m3Sb  | 1508(1) keV  | 2019 | 600(15) ns  | IT  | 130Sb  | (11+)  |  |
130m4Sb  | 1544.7(5) keV  | 2002 | 1.25(1) μs  | IT  | 130Sb  | (13+)  |  |
131Sb  | 51  | 80  | 130.9119893(22)  | 1956 | 23.03(4) min  | β− | 131Te  | 7/2+  |  |
131m1Sb  | 1676.06(6) keV  | 1977 | 64.2(26) μs  | IT  | 131Sb  | 15/2−  |  |
131m2Sb  | 1687.2(9) keV  | 2000 | 4.3(8) μs  | IT  | 131Sb  | 19/2−  |  |
131m3Sb  | 2165.6(15) keV  | 2000 | 0.97(3) μs  | IT  | 131Sb  | 23/2+  |  |
132Sb  | 51  | 81  | 131.9145141(29)[2] | 1956 | 2.79(7) min  | β− | 132Te  | (4)+  |  |
132m1Sb  | 139.3(20) keV[2] | 1974 | 4.10(5) min  | β− | 132Te  | (8−)  |  |
132m2Sb  | 254.5(3) keV  | 1989 | 102(4) ns  | IT  | 132Sb  | (6−)  |  |
133Sb  | 51  | 82  | 132.9152721(34)  | 1966 | 2.34(5) min  | β− | 133Te  | (7/2+)  |  |
133mSb  | 4541(9) keV  | 1978 | 16.54(19) μs  | IT  | 133Sb  | (21/2+)  |  |
134Sb  | 51  | 83  | 133.9205373(33)  | 1967 | 674(4) ms  | β− | 134Te  | (0-)  |  |
β−, n?  | 133Te
134mSb  | 279(1) keV  | 1972 | 10.01(4) s  | β− (99.91%)  | 134Te  | (7−)  |  |
β−, n (0.088%)  | 133Te
135Sb  | 51  | 84  | 134.9251844(28)  | 1964 | 1.668(9) s  | β− (80.9%)  | 135Te  | (7/2+)  |  |
β−, n (19.1%)  | 134Te
136Sb  | 51  | 85  | 135.9307490(63)  | 1976 | 0.923(14) s  | β− (75.2%)  | 136Te  | (1−)  |  |
β−, n (24.7%)  | 135Te
β−, 2n (0.14%)  | 134Te
136mSb  | 269.3(5) keV  | 2001 | 570(5) ns  | IT  | 136Sb  | (6−)  |  |
137Sb  | 51  | 86  | 136.935523(56)  | 1994 | 497(21) ms  | β− (51%)  | 137Te  | 7/2+#  |  |
β−, n (49%)  | 136Te
β−, 2n?  | 135Te
138Sb  | 51  | 87  | 137.94133(32)#  | 1994 | 333(7) ms  | β−, n (72%)  | 137Te  | (3−)  |  |
β− (28%)  | 138Te
β−, 2n?  | 136Te
139Sb  | 51  | 88  | 138.94627(43)#  | 1994 | 182(9) ms  | β−, n (90%)  | 138Te  | 7/2+#  |  |
β− (10%)  | 139Te
β−, 2n?  | 137Te
140Sb  | 51  | 89  | 139.95235(64)#  | 2010 | 170(6) ms  | β− (69%)  | 140Te  | (3−)  |  |
β−, n (23%)  | 139Te
β−, 2n (7.6%)  | 138Te
140mSb  | 330(30)# keV  | 2016 | 41(8) μs  | IT  | 140Sb  | (6−,7−)  |  |
141Sb  | 51  | 90  | 140.95755(54)#  | 2015 | 103(29) ms  | β− | 141Te  | 7/2+#  |  |
β−, n?  | 140Te
β−, 2n?  | 139Te
142Sb  | 51  | 91  | 141.96392(32)#  | 2018 | 80(50) ms  | β− | 142Te  |  |  |
β−, n?  | 141Te
β−, 2n?  | 140Te

1. ↑ mSb - Excited nuclear isomer.
2. ↑ ( ) - Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
3. ↑ # - Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
4. ↑ Modes of decay:  EC: | Electron capture

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IT: | Isomeric transition
n: | Neutron emission
p: | Proton emission
5. ↑ Bold italics symbol as daughter - Daughter product is nearly stable.
6. ↑ Bold symbol as daughter - Daughter product is stable.
7. ↑ ( ) spin value - Indicates spin with weak assignment arguments.
8. ↑ 8.0 8.1 # - Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
9. ↑ Order of ground state and isomer is uncertain.
10. ↑ 10.0 10.1 10.2 10.3 fission product

## See also

Daughter products other than antimony

* Isotopes of tellurium
* Isotopes of tin
* Isotopes of indium

## References

1. ↑ Nies, L.; Atanasov, D.; Athanasakis-Kaklamanakis, M.; Au, M.; Bernerd, C.; Blaum, K.; Chrysalidis, K.; Fischer, P. et al. (9 January 2025). "Refining the nuclear mass surface with the mass of Sn 103". Physical Review C 111 (1). doi:10.1103/PhysRevC.111.014315.
2. ↑ 2.0 2.1 Jaries, A.; Stryjczyk, M.; Kankainen, A.; Ayoubi, L. Al; Beliuskina, O.; Canete, L.; de Groote, R. P.; Delafosse, C. et al. (2024). "Isomeric states of fission fragments explored via Penning trap mass spectrometry at IGISOL". Physical Review C 110 (3). doi:10.1103/PhysRevC.110.034326. Bibcode: 2024PhRvC.110c4326J. https://journals.aps.org/prc/accepted/fe077P3cDac1f601a8c16c34b19fb124fc3509f19.

* 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, doi:10.1016/j.nuclphysa.2003.11.001, Bibcode: 2003NuPhA.729....3A, https://hal.archives-ouvertes.fr/in2p3-00020241/document
* Isotopic compositions and standard atomic masses from:
* Template:CIAAW2003
* Template:CIAAW2005
* 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, doi:10.1016/j.nuclphysa.2003.11.001, Bibcode: 2003NuPhA.729....3A, https://hal.archives-ouvertes.fr/in2p3-00020241/document
* National Nuclear Data Center. "NuDat 2.x database". Brookhaven National Laboratory. http://www.nndc.bnl.gov/nudat2/.
* Lide, David R., ed (2004). "11. Table of the Isotopes". CRC Handbook of Chemistry and Physics (85th ed.). Boca Raton, Florida: CRC Press. ISBN 978-0-8493-0485-9.

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