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Isotopes of erbium

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Naturally occurring erbium (68Er) is composed of six stable isotopes, with 166Er being the most abundant (33.503% natural abundance). Radioisotopes have been characterized with from 145Er to 175Er, all having half-lives less than ten days: the most stable are 169Er (9.39 days), 172Er (49.3 hours), and 160Er (28.58 hours). All of the remaining radioactive isotopes have half-lives that are less than 11 hours, and the majority of these have half-lives that are less than 4 minutes. This element also has numerous meta states, with the most stable being 149m1Er (t1/2 = 8.9 seconds).

The primary decay mode before the most abundant stable isotope, 166Er, is electron capture to holmium isotopes, and the primary mode after is beta decay to thulium isotopes. All isotopes of erbium are either radioactive or observationally stable, meaning that they are predicted to be radioactive but no actual decay has been observed.

List of isotopes

Erbium-142 |-id=Erbium-143 | 143Er | 142.96655(43)# | 200# ms | | | 9/2−# | | |-id=Erbium-144 | 144Er | 143.96070(21)# | 400# ms[ 200 ns] | | | 0+ | | |-id=Erbium-145 | β+

145Ho
β+, p (?%)
144Dy
-id=Erbium-145m
β+
145Ho
-
β+, p (?%)
144Dy
-id=Erbium-146
β+
146Ho
-
β+, p (?%)
145Dy
-id=Erbium-147
β+
147Ho
-
β+, p (?%)
146Dy
-id=Erbium-147m
β+
147Ho
-
β+, p (?%)
146Dy
-id=Erbium-148
β+ (99.85%)
148Ho
-
β+, p (0.15%)
147Dy
-id=Erbium-148m
13(3) μs
IT
148Er
(10+)

| | |-id=Erbium-149 | β+ (93%)

149Ho
β+, p (7%)
148Dy
-id=Erbium-149m1
β+ (96.3%)
149Ho
-
IT (3.5%)
149Er
-
β+, p (0.18%)
148Dy
-id=Erbium-149m2
0.61(8) μs
IT
149Er
(19/2+)

| | |-id=Erbium-149m3 | 4.8(1) μs | IT | 149Er | (27/2−) | | |-id=Erbium-150 | 150Er | 149.937916(18) | 18.5(7) s | β+ | 150Ho | 0+ | | |-id=Erbium-150m | 2.55(10) μs | IT | 150Er | 10+ | | |-id=Erbium-151 | 151Er | 150.937449(18) | 23.5(20) s | β+ | 151Ho | (7/2−) | | |-id=Erbium-151m1 | IT (95.3%)

151Er
β+ (4.7%)
151Ho
-id=Erbium-151m2
0.42(5) μs
IT
151Er
(65/2-, 61/2+)

| | |-id=Erbium-152 | α (90%)

148Dy
β+ (10%)
152Ho
-id=Erbium-153
α (53%)
149Dy
-
β+ (47%)
153Ho
-id=Erbium-153m1
373(9) ns
IT
153Er
(27/2-)

| | |-id=Erbium-153m2 | 248(32) ns | IT | 153Er | (41/2-) | | |-id=Erbium-154 | β+ (99.53%)

154Ho
α (0.47%)
150Dy
-id=Erbium-155
β+ (99.978%)
155Ho
-
α (0.022%)
151Dy
-id=Erbium-156
β+
156Ho
-
α (1.2%)
152Dy
-id=Erbium-157
157Er
156.931923(28)
18.65(10) min
β+
157Ho
3/2−

| | |-id=Erbium-157m | 76(6) ms | IT | 157Er | 9/2+ | | |-id=Erbium-158 | 158Er | 157.929893(27) | 2.29(6) h | EC | 158Ho | 0+ | | |-id=Erbium-159 | 159Er | 158.930691(4) | 36(1) min | β+ | 159Ho | 3/2− | | |-id=Erbium-159m1 | 337(14) ns | IT | 159Er | 9/2+ | | |-id=Erbium-159m2 | 590(60) ns | IT | 159Er | 11/2− | | |-id=Erbium-160 | 160Er | 159.929077(26) | 28.58(9) h | EC | 160Ho | 0+ | | |-id=Erbium-161 | 161Er | 160.930004(9) | 3.21(3) h | β+ | 161Ho | 3/2− | | |-id=Erbium-161m | 7.5(7) μs | IT | 161Er | 11/2− | | |-id=Erbium-162 | 162Er | 161.9287873(8) | 0+ | 0.00139(5) | |-id=Erbium-162m | 88(16) ns | IT | 162Er | 7(-) | | |-id=Erbium-163 | 163Er | 162.930040(5) | 75.0(4) min | β+ | 163Ho | 5/2− | | |-id=Erbium-163m | 580(100) ns | IT | 163Er | (11/2−) | | |-id=Erbium-164 | 164Er | 163.9292077(8) | 0+ | 0.01601(3) | |-id=Erbium-165 | 165Er | 164.9307335(10) | 10.36(4) h | EC | 165Ho | 5/2− | | |-id=Erbium-165m1 | 250(30) ns | IT | 165Er | 11/2- | | |-id=Erbium-165m2 | 370(40) ns | IT | 165Er | (19/2) | | |-id=Erbium-166 | 166Er | 165.9303011(4) | 0+ | 0.33503(36) | |-id=Erbium-167 | 167Er | 166.9320562(3) | 7/2+ | 0.22869(9) | |-id=Erbium-167m | 2.269(6) s | IT | 167Er | 1/2− | | |-id=Erbium-168 | 168Er | 167.93237828(28) | 0+ | 0.26978(18) | |-id=Erbium-168m | 109.0(7) ns | IT | 168Er | 4- | | |-id=Erbium-169 | 169Er | 168.9345984(3) | 9.392(18) d | β− | 169Tm | 1/2− | | |-id=Erbium-169m1 | 285(20) ns | IT | 169Er | (5/2)- | | |-id=Erbium-169m2 | 200(10) ns | IT | 169Er | 7/2+ | | |-id=Erbium-170 | 170Er | 169.9354719(15) | 0+ | 0.14910(36) | |-id=Erbium-171 | 171Er | 170.9380374(15) | 7.516(2) h | β− | 171Tm | 5/2− | | |-id=Erbium-171m | 210(10) ns | IT | 171Er | 1/2− | | |-id=Erbium-172 | 172Er | 171.939363(4) | 49.3(5) h | β− | 172Tm | 0+ | | |- |-id=Erbium-172m | 579(62) ns | IT | 172Er | (6+) | | |-id=Erbium-173 | 173Er | 172.94240(21)# | 1.434(17) min | β− | 173Tm | (7/2−) | | |-id=Erbium-174 | 174Er | 173.94423(32)# | 3.2(2) min | β− | 174Tm | 0+ | | |-id=Erbium-174m | 3.9(3) s | IT | 174Er | 8- | | |-id=Erbium-175 | 175Er | 174.94777(43)# | 1.2(3) min | β− | 175Tm | 9/2+# | | |-id=Erbium-176 | 176Er | 175.94994(43)# | 12# s[300 ns] | | | 0+ | | |-id=Erbium-177 | 177Er | 176.95399(54)# | 8# s[300 ns] | | | 1/2−# | | |-id=Erbium-178 | 178Er | 177.95678(64)# | 4# s[300 ns] | | | 0+ | | |-id=Erbium-179 | 179Er | 178.96127(54)# | 3# s[550 ns)] | | | 3/2−# | | |-id=Erbium-180 | 180Er | 179.96438(54)# | 2# s[550 ns] | | | 0+ | |

References

Isotope masses from:

    • Isotopic compositions and standard atomic masses from:

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

    Info: Wikipedia Source

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