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Isotopes of antimony

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Antimony (Sb) occurs naturally as two stable isotopes, Sb (57.21%) and Sb (42.79%). There are 37 artificial radioactive isotopes known with mass numbers 104 to 142, the lightest two of which (Sb) 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 Sb is observed to decay in both ways.

The most stable radioisotope of antimony is the minor fission product Sb, with a half-life of 2.758 years; Sb, with half-life 60.20 days; and Sb, 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 Sb with half-life 5.76 days; this nuclide has not been confirmed not to be the ground state.

List of isotopes

Antimony-102

|-id=Antimony-104 | β+?

104Sn
p (
103Sn
-
β+, p (
103In
-
α?
100In
-id=Antimony-105
β+ (99.9%)
105Sn
-
p (
104Sn
-
β+, p?
104In
-id=Antimony-106
106Sb
105.9286380(80)
0.6(2) s
β+
106Sn
(2+)

| | |-id=Antimony-106m | 226(14) ns | IT | 106Sb | (4+) | | |-id=Antimony-107 | 107Sb | 106.9241506(45) | 4.0(2) s | β+ | 107Sn | 5/2+# | | |-id=Antimony-108 | 108Sb | 107.9222267(59) | 7.4(3) s | β+ | 108Sn | (4+) | | |-id=Antimony-109 | 109Sb | 108.9181412(57) | 17.2(5) s | β+ | 109Sn | 5/2+# | | |-id=Antimony-110 | 110Sb | 109.9168543(64) | 23.6(3) s | β+ | 110Sn | (3+) | | |-id=Antimony-111 | 111Sb | 110.9132182(95) | 75(1) s | β+ | 111Sn | (5/2+) | | |-id=Antimony-112 | 112Sb | 111.912400(19) | 53.5(6) s | β+ | 112Sn | (3+) | | |-id=Antimony-112m | 536(22) ns | IT | 112Sb | (8−) | | |-id=Antimony-113 | 113Sb | 112.909375(18) | 6.67(7) min | β+ | 113Sn | 5/2+ | | |-id=Antimony-114 | 114Sb | 113.909289(21) | 3.49(3) min | β+ | 114Sn | 3+ | | |-id=Antimony-114m | 219(12) μs | IT | 114Sb | (8−) | | |-id=Antimony-115 | 115Sb | 114.906598(17) | 32.1(3) min | β+ | 115Sn | 5/2+ | | |-id=Antimony-115m | 159(3) ns | IT | 115Sb | (19/2)− | | |-id=Antimony-116 | 116Sb | 115.9067927(55) | 15.8(8) min | β+ | 116Sn | 3+ | | |-id=Antimony-116m1 | 194(4) ns | IT | 116Sb | 1+ | | |-id=Antimony-116m2 | 60.3(6) min | β+ | 116Sn | 8− | | |-id=Antimony-117 | 117Sb | 116.9048415(91) | 2.97(2) h | β+ | 117Sn | 5/2+ | | |-id=Antimony-117m1 | 355(17) μs | IT | 117Sb | (25/2)+ | | |-id=Antimony-117m2 | 290(5) ns | IT | 117Sb | (23/2−) | | |-id=Antimony-118 | 118Sb | 117.9055322(32) | 3.6(1) min | β+ | 118Sn | 1+ | | |-id=Antimony-118m1 | 20.6(6) μs | IT | 118Sb | 3+ | | |-id=Antimony-118m2 | 5.01(3) h | β+ | 118Sn | 8− | | |-id=Antimony-119 | 119Sb | 118.9039441(75) | 38.19(22) h | EC | 119Sn | 5/2+ | | |-id=Antimony-119m1 | 130(3) ns | IT | 119Sb | 19/2− | | |-id=Antimony-119m2 | 835(81) ms | IT | 119Sb | 25/2+ | | |-id=Antimony-120 | 120Sb | 119.9050803(77) | 15.89(4) min | β+ | 120Sn | 1+ | | |-id=Antimony-120m1 | 5.76(2) d | β+ | 120Sn | 8− | | |-id=Antimony-120m2 | 246(2) ns | IT | 120Sb | (3+) | | |-id=Antimony-120m3 | 400(8) ns | IT | 120Sb | 13+ | | |-id=Antimony-121 | 121SbFission product | 120.9038114(27) | 5/2+ | 0.5721(5) | |-id=Antimony-121m | 179(6) μs | IT | 121Sb | (25/2+) | | |-id=Antimony-122 | β− (97.59%)

122Te
β+ (2.41%)
122Sn
-id=Antimony-122m1
1.86(8) μs
IT
122Sb
3+

| | |-id=Antimony-122m2 | 0.53(3) ms | IT | 122Sb | 5+ | | |-id=Antimony-122m3 | 4.191(3) min | IT | 122Sb | 8− | | |-id=Antimony-123 | 123Sb | 122.9042153(15) | 7/2+ | 0.4279(5) | |-id=Antimony-123m1 | 214(3) ns | IT | 123Sb | 19/2− | | |-id=Antimony-123m2 | 65(1) μs | IT | 123Sb | 23/2+ | | |-id=Antimony-124 | 124Sb | 123.9059371(15) | 60.20(3) d | β− | 124Te | 3− | | |-id=Antimony-124m1 | IT (75%)

124Sb
β− (25%)
124Te
-id=Antimony-124m2
20.2(2) min
IT
124m1Sb
(8)−

| | |-id=Antimony-124m3 | 3.2(3) μs | IT | 124Sb | (3+) | | |-id=Antimony-125 | 125Sb | 124.9052543(27) | 2.7576(11) y | β− | 125Te | 7/2+ | | |-id=Antimony-125m1 | 4.1(2) μs | IT | 125Sb | 15/2− | | |-id=Antimony-125m2 | 28.5(5) μs | IT | 125Sb | 19/2− | | |-id=Antimony-125m3 | 277.0(64) ns | IT | 125Sb | (23/2)+ | | |-id=Antimony-126 | 126Sb | 125.907253(34) | 12.35(6) d | β− | 126Te | 8− | | |-id=Antimony-126m1 | β− (86%)

126Te
IT (14%)
126Sb
-id=Antimony-126m2
~11 s
IT
126m1Sb
3−

| | |-id=Antimony-126m3 | 553(5) ns | IT | 126Sb | 3+ | | |-id=Antimony-126m4 | 90(16) ns | IT | 126Sb | (13+) | | |-id=Antimony-127 | 127Sb | 126.9069256(55) | 3.85(5) d | β− | 127Te | 7/2+ | | |-id=Antimony-127m1 | 11.7(1) μs | IT | 127Sb | 15/2− | | |-id=Antimony-127m2 | 269(5) ns | IT | 127Sb | 23/2+ | | |-id=Antimony-128 | 128Sb | 127.909146(20) | 9.05(4) h | β− | 128Te | 8− | | |-id=Antimony-128m1 | β− (96.4%)

128Te
IT (3.6%)
128Sb
-id=Antimony-128m2
500(20) ns
IT
128Sb
(11+)

| | |-id=Antimony-128m3 | 217(7) ns | IT | 128Sb | (13+) | | |-id=Antimony-129 | 129Sb | 128.909147(23) | 4.366(26) h | β− | 129Te | 7/2+ | | |-id=Antimony-129m1 | β− (85%)

129Te
IT (15%)
129Sb
-id=Antimony-129m2
2.23(17) μs
IT
129Sb
15/2−

| | |-id=Antimony-129m3 | 0.89(3) μs | IT | 129Sb | 23/2+ | | |-id=Antimony-130 | 130Sb | 129.911663(15) | 39.5(8) min | β− | 130Te | 8− | | |-id=Antimony-130m1 | 6.3(2) min | β− | 130Te | 4+ | | |-id=Antimony-130m2 | 800(100) ns | IT | 130Sb | 6− | | |-id=Antimony-130m3 | 600(15) ns | IT | 130Sb | (11+) | | |-id=Antimony-130m4 | 1.25(1) μs | IT | 130Sb | (13+) | | |-id=Antimony-131 | 131Sb | 130.9119893(22) | 23.03(4) min | β− | 131Te | 7/2+ | | |-id=Antimony-131m1 | 64.2(26) μs | IT | 131Sb | 15/2− | | |-id=Antimony-131m2 | 4.3(8) μs | IT | 131Sb | 19/2− | | |-id=Antimony-131m3 | 0.97(3) μs | IT | 131Sb | 23/2+ | | |-id=Antimony-132 | 132Sb | 131.9145141(29) | 2.79(7) min | β− | 132Te | (4)+ | | |-id=Antimony-132m1 | 4.10(5) min | β− | 132Te | (8−) | | |-id=Antimony-132m2 | 102(4) ns | IT | 132Sb | (6−) | | |-id=Antimony-133 | 133Sb | 132.9152721(34) | 2.34(5) min | β− | 133Te | (7/2+) | | |-id=Antimony-133m | 16.54(19) μs | IT | 133Sb | (21/2+) | | |-id=Antimony-134 | β−

134Te
β−, n?
133Te
-id=Antimony-134m
β− (99.91%)
134Te
-
β−, n (0.088%)
133Te
-id=Antimony-135
β− (80.9%)
135Te
-
β−, n (19.1%)
134Te
-id=Antimony-136
β− (75.2%)
136Te
-
β−, n (24.7%)
135Te
-
β−, 2n (0.14%)
134Te
-id=Antimony-136m
570(5) ns
IT
136Sb
(6−)

| | |-id=Antimony-137 | β− (51%)

137Te
β−, n (49%)
136Te
-
β−, 2n?
135Te
-id=Antimony-138
β−, n (72%)
137Te
-
β− (28%)
138Te
-
β−, 2n?
136Te
-id=Antimony-139
β−, n (90%)
138Te
-
β− (10%)
139Te
-
β−, 2n?
137Te
-id=Antimony-140
β− (69%)
140Te
-
β−, n (23%)
139Te
-
β−, 2n (7.6%)
138Te
-id=Antimony-140m
41(8) μs
IT
140Sb
(6−,7−)

| | |-id=Antimony-141 | β−

141Te
β−, n?
140Te
-
β−, 2n?
139Te
-id=Antimony-142
β−
142Te
-
β−, n?
141Te
-
β−, 2n?
140Te

References

Isotope masses from:

    • Isotopic compositions and standard atomic masses from:

    • Half-life, spin, and isomer data selected from the following sources.

    References

    1. (9 January 2025). "Refining the nuclear mass surface with the mass of Sn 103". Physical Review C.
    2. (2024). "Isomeric states of fission fragments explored via Penning trap mass spectrometry at IGISOL". Physical Review C.
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