Isotopes of antimony

Short description: Nuclides with atomic number of 51 but with different mass numbers

Antimony (51Sb) occurs in two stable isotopes, 121Sb and 123Sb. There are 35 artificial radioactive isotopes, the longest-lived of which are 125Sb, with a half-life of 2.75856 years; 124Sb, with a half-life of 60.2 days; and 126Sb, with a half-life of 12.35 days. All other isotopes have half-lives less than 4 days, most less than an hour.

There are also many isomers, the longest-lived of which is 120m1Sb with a half-life of 5.76 days.

With the exception of beryllium, antimony is the lightest element observed to have isotopes capable of undergoing alpha decay, with the isotope 104Sb being seen to undergo this mode of decay. Some lighter elements, namely those in the vicinity of 8Be, have isotopes with delayed alpha emission (following proton or beta emission) as a rare branch.

## 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
103Sb  | 51  | 52  | 102.93969(32)#  | 100# ms [>1.5 µs]  | β+ | 103Sn  | 5/2+#  |  |
104Sb  | 51  | 53  | 103.93647(39)#  | 0.47(13) s
[0.44(+15−11) s]  | β+ (86%)  | 104Sn  |  |  |
p (7%)  | 103Sn
β+, p (7%)  | 103In
α (<1%)  | 100In
105Sb  | 51  | 54  | 104.93149(11)  | 1.12(16) s  | β+ (99%)  | 105Sn  | (5/2+)  |  |
p (1%)  | 104Sn
β+, p (<1%)  | 104In
106Sb  | 51  | 55  | 105.92879(34)#  | 0.6(2) s  | β+ | 106Sn  | (4+)  |  |
106mSb  | 1000(500)# keV  | 220(20) ns  |  |  |  |  |
107Sb  | 51  | 56  | 106.92415(32)#  | 4.0(2) s  | β+ | 107Sn  | 5/2+#  |  |
108Sb  | 51  | 57  | 107.92216(22)#  | 7.4(3) s  | β+ | 108Sn  | (4+)  |  |
β+, p (rare)  | 107In
109Sb  | 51  | 58  | 108.918132(20)  | 17.3(5) s  | β+ | 109Sn  | 5/2+#  |  |
110Sb  | 51  | 59  | 109.91675(22)#  | 23.0(4) s  | β+ | 110Sn  | (4+)  |  |
111Sb  | 51  | 60  | 110.91316(3)  | 75(1) s  | β+ | 111Sn  | (5/2+)  |  |
112Sb  | 51  | 61  | 111.912398(19)  | 51.4(10) s  | β+ | 112Sn | 3+  |  |
113Sb  | 51  | 62  | 112.909372(19)  | 6.67(7) min  | β+ | 113Sn  | 5/2+  |  |
114Sb  | 51  | 63  | 113.90927(3)  | 3.49(3) min  | β+ | 114Sn | (3+)  |  |
114mSb  | 495.5(7) keV  | 219(12) µs  |  |  | (8−)  |  |
115Sb  | 51  | 64  | 114.906598(17)  | 32.1(3) min  | β+ | 115Sn | 5/2+  |  |
116Sb  | 51  | 65  | 115.906794(6)  | 15.8(8) min  | β+ | 116Sn | 3+  |  |
116m1Sb  | 93.99(5) keV  | 194(4) ns  |  |  | 1+  |  |
116m2Sb  | 380(40) keV  | 60.3(6) min  | β+ | 116Sn | 8−  |  |
117Sb  | 51  | 66  | 116.904836(10)  | 2.80(1) h  | β+ | 117Sn | 5/2+  |  |
118Sb  | 51  | 67  | 117.905529(4)  | 3.6(1) min  | β+ | 118Sn | 1+  |  |
118m1Sb  | 50.814(21) keV  | 20.6(6) µs  |  |  | (3)+  |  |
118m2Sb  | 250(6) keV  | 5.00(2) h  | β+ | 118Sn | 8−  |  |
119Sb  | 51  | 68  | 118.903942(9)  | 38.19(22) h  | EC | 119Sn | 5/2+  |  |
119m1Sb  | 2553.6(3) keV  | 130(3) ns  |  |  | (19/2−)  |  |
119m2Sb  | 2852(7) keV  | 850(90) ms  | IT  | 119Sb  | 27/2+#  |  |
120Sb  | 51  | 69  | 119.905072(8)  | 15.89(4) min  | β+ | 120Sn | 1+  |  |
120m1Sb  | 0(100)# keV  | 5.76(2) d  | β+ | 120Sn | 8−  |  |
120m2Sb  | 78.16(5) keV  | 246(2) ns  |  |  | (3+)  |  |
120m3Sb  | 2328.3(6) keV  | 400(8) ns  |  |  | (6)  |  |
121Sb[n 9] | 51  | 70  | 120.9038157(24)  | Stable | 5/2+  | 0.5721(5)  |
122Sb  | 51  | 71  | 121.9051737(24)  | 2.7238(2) d  | β− (97.59%)  | 122Te | 2−  |  |
β+ (2.41%)  | 122Sn
122m1Sb  | 61.4131(5) keV  | 1.86(8) µs  |  |  | 3+  |  |
122m2Sb  | 137.4726(8) keV  | 0.53(3) ms  |  |  | (5)+  |  |
122m3Sb  | 163.5591(17) keV  | 4.191(3) min  | IT  | 122Sb  | (8)−  |  |
123Sb[n 9] | 51  | 72  | 122.9042140(22)  | Stable | 7/2+  | 0.4279(5)  |
124Sb  | 51  | 73  | 123.9059357(22)  | 60.20(3) d  | β− | 124Te | 3−  |  |
124m1Sb  | 10.8627(8) keV  | 93(5) s  | IT (75%)  | 124Sb  | 5+  |  |
β− (25%)  | 124Te
124m2Sb  | 36.8440(14) keV  | 20.2(2) min  |  |  | (8)−  |  |
124m3Sb  | 40.8038(7) keV  | 3.2(3) µs  |  |  | (3+, 4+)  |  |
125Sb  | 51  | 74  | 124.9052538(28)  | 2.75856(25) y  | β− | 125mTe  | 7/2+  |  |
126Sb  | 51  | 75  | 125.90725(3)  | 12.35(6) d  | β− | 126Te | (8−)  |  |
126m1Sb  | 17.7(3) keV  | 19.15(8) min  | β− (86%)  | 126Te | (5+)  |  |
IT (14%)  | 126Sb
126m2Sb  | 40.4(3) keV  | ~11 s  | IT  | 126m1Sb  | (3−)  |  |
126m3Sb  | 104.6(3) keV  | 553(5) ns  |  |  | (3+)  |  |
127Sb  | 51  | 76  | 126.906924(6)  | 3.85(5) d  | β− | 127mTe  | 7/2+  |  |
128Sb  | 51  | 77  | 127.909169(27)  | 9.01(4) h  | β− | 128Te | 8−  |  |
128mSb  | 10(7) keV  | 10.4(2) min  | β− (96.4%)  | 128Te | 5+  |  |
IT (3.6%)  | 128Sb
129Sb  | 51  | 78  | 128.909148(23)  | 4.40(1) h  | β− | 129mTe  | 7/2+  |  |
129m1Sb  | 1851.05(10) keV  | 17.7(1) min  | β− (85%)  | 129Te  | (19/2−)  |  |
IT (15%)  | 129Sb
129m2Sb  | 1860.90(10) keV  | >2 µs  |  |  | (15/2−)  |  |
129m3Sb  | 2138.9(5) keV  | 1.1(1) µs  |  |  | (23/2+)  |  |
130Sb  | 51  | 79  | 129.911656(18)  | 39.5(8) min  | β− | 130Te | (8−)#  |  |
130mSb  | 4.80(20) keV  | 6.3(2) min  | β− | 130Te | (4, 5)+  |  |
131Sb  | 51  | 80  | 130.911982(22)  | 23.03(4) min  | β− | 131mTe  | (7/2+)  |  |
132Sb  | 51  | 81  | 131.914467(15)  | 2.79(5) min  | β− | 132Te  | (4+)  |  |
132m1Sb  | 200(30) keV  | 4.15(5) min  | β− | 132Te  | (8−)  |  |
132m2Sb  | 254.5(3) keV  | 102(4) ns  |  |  | (6−)  |  |
133Sb  | 51  | 82  | 132.915252(27)  | 2.5(1) min  | β− | 133mTe  | (7/2+)  |  |
134Sb  | 51  | 83  | 133.92038(5)  | 0.78(6) s  | β− | 134Te  | (0-)  |  |
134mSb  | 80(110) keV  | 10.07(5) s  | β− (99.9%)  | 134Te  | (7−)  |  |
β−, n (.091%)  | 133Te
135Sb  | 51  | 84  | 134.92517(11)  | 1.68(2) s  | β− (82.4%)  | 135Te  | (7/2+)  |  |
β−, n (17.6%)  | 134Te
136Sb  | 51  | 85  | 135.93035(32)#  | 0.923(14) s  | β− (83%)  | 136Te  | 1−#  |  |
β−, n (17%)  | 135Te
136mSb  | 173(3) keV  | 570(50) ns  |  |  | 6−#  |  |
137Sb  | 51  | 86  | 136.93531(43)#  | 450(50) ms  | β− | 137Te  | 7/2+#  |  |
β−, n  | 136Te
138Sb  | 51  | 87  | 137.94079(32)#  | 500# ms [>300 ns]  | β− | 138Te  | 2−#  |  |
β−, n  | 137Te
139Sb  | 51  | 88  | 138.94598(54)#  | 300# ms [>300 ns]  | β− | 139Te  | 7/2+#  |  |

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. ↑ 9.0 9.1 Fission product

## See also

## References

* 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:
* Wieser, Michael E. (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry 78 (11): 2051–2066. doi:10.1351/pac200678112051.
* 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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