Isotopes of erbium

More information Nuclide, Z ...

Nuclide ^{[n 1]}	Z	N	Isotopic mass (Da)^[4] ^{[n 2]}^{[n 3]}	Half-life^[1] ^{[n 4]}	Decay mode^[1] ^{[n 5]}	Daughter isotope ^{[n 6]}	Spin and parity^[1] ^{[n 7]}^{[n 4]}	Natural abundance (mole fraction)
Nuclide ^{[n 1]}	Excitation energy^{[n 4]}			Half-life^[1] ^{[n 4]}	Decay mode^[1] ^{[n 5]}	Daughter isotope ^{[n 6]}	Spin and parity^[1] ^{[n 7]}^{[n 4]}	Normal proportion^[1]	Range of variation
¹⁴³Er	68	75	142.96655(43)#	200# ms			9/2−#
¹⁴⁴Er	68	76	143.96070(21)#	400# ms [> 200 ns]			0+
¹⁴⁵Er	68	77	144.95787(22)#	900(200) ms	β⁺	¹⁴⁵Ho	1/2+#
¹⁴⁵Er	68	77	144.95787(22)#	900(200) ms	β⁺, p (?%)	¹⁴⁴Dy	1/2+#
^145mEr	205(4)# keV			1.0(3) s	β⁺	¹⁴⁵Ho	(11/2-)
^145mEr	205(4)# keV			1.0(3) s	β⁺, p (?%)	¹⁴⁴Dy	(11/2-)
¹⁴⁶Er	68	78	145.952418(7)	1.7(6) s	β⁺	¹⁴⁶Ho	0+
¹⁴⁶Er	68	78	145.952418(7)	1.7(6) s	β⁺, p (?%)	¹⁴⁵Dy	0+
¹⁴⁷Er	68	79	146.94996(4)#	3.2(12) s	β⁺	¹⁴⁷Ho	(1/2+)
¹⁴⁷Er	68	79	146.94996(4)#	3.2(12) s	β⁺, p (?%)	¹⁴⁶Dy	(1/2+)
^147mEr^{[n 8]}	100(50)# keV			1.6(2) s	β⁺	¹⁴⁷Ho	(11/2−)
^147mEr^{[n 8]}	100(50)# keV			1.6(2) s	β⁺, p (?%)	¹⁴⁶Dy	(11/2−)
¹⁴⁸Er	68	80	147.944735(11)#	4.6(2) s	β⁺ (99.85%)	¹⁴⁸Ho	0+
¹⁴⁸Er	68	80	147.944735(11)#	4.6(2) s	β⁺, p (0.15%)	¹⁴⁷Dy	0+
^148mEr	2.9132(4) MeV			13(3) μs	IT	¹⁴⁸Er	(10+)
¹⁴⁹Er	68	81	148.94231(3)	4(2) s	β⁺ (93%)	¹⁴⁹Ho	(1/2+)
¹⁴⁹Er	68	81	148.94231(3)	4(2) s	β⁺, p (7%)	¹⁴⁸Dy	(1/2+)
^149m1Er	741.8(2) keV			8.9(2) s	β⁺ (96.3%)	¹⁴⁹Ho	(11/2−)
					IT (3.5%)	¹⁴⁹Er
					β⁺, p (0.18%)	¹⁴⁸Dy
^149m2Er	2.6111(3) MeV			0.61(8) μs	IT	¹⁴⁹Er	(19/2+)
^149m3Er	3.302(7) MeV			4.8(1) μs	IT	¹⁴⁹Er	(27/2−)
¹⁵⁰Er	68	82	149.937916(18)	18.5(7) s	β⁺	¹⁵⁰Ho	0+
^150mEr	2.7965(5) MeV			2.55(10) μs	IT	¹⁵⁰Er	10+
¹⁵¹Er	68	83	150.937449(18)	23.5(20) s	β⁺	¹⁵¹Ho	(7/2−)
^151m1Er	2.5860(5) MeV			580(20) ms	IT (95.3%)	¹⁵¹Er	(27/2−)
^151m1Er	2.5860(5) MeV			580(20) ms	β⁺ (4.7%)	¹⁵¹Ho	(27/2−)
^151m2Er	10.2866(10) MeV			0.42(5) μs	IT	¹⁵¹Er	(65/2-, 61/2+)
¹⁵²Er	68	84	151.935050(9)	10.3(1) s	α (90%)	¹⁴⁸Dy	0+
¹⁵²Er	68	84	151.935050(9)	10.3(1) s	β⁺ (10%)	¹⁵²Ho	0+
¹⁵³Er	68	85	152.935086(10)	37.1(2) s	α (53%)	¹⁴⁹Dy	7/2−
¹⁵³Er	68	85	152.935086(10)	37.1(2) s	β⁺ (47%)	¹⁵³Ho	7/2−
^153m1Er	2.7982(10) MeV			373(9) ns	IT	¹⁵³Er	(27/2-)
^153m2Er	5.2481(10) MeV			248(32) ns	IT	¹⁵³Er	(41/2-)
¹⁵⁴Er	68	86	153.932791(5)	3.73(9) min	β⁺ (99.53%)	¹⁵⁴Ho	0+
¹⁵⁴Er	68	86	153.932791(5)	3.73(9) min	α (0.47%)	¹⁵⁰Dy	0+
¹⁵⁵Er	68	87	154.933216(7)	5.3(3) min	β⁺ (99.978%)	¹⁵⁵Ho	7/2−
¹⁵⁵Er	68	87	154.933216(7)	5.3(3) min	α (0.022%)	¹⁵¹Dy	7/2−
¹⁵⁶Er	68	88	155.931066(26)	19.5(10) min	β⁺	¹⁵⁶Ho	0+
¹⁵⁶Er	68	88	155.931066(26)	19.5(10) min	α (1.2×10⁻⁵%)	¹⁵²Dy	0+
¹⁵⁷Er	68	89	156.931923(28)	18.65(10) min	β⁺	¹⁵⁷Ho	3/2−
^157mEr	155.4(3) keV			76(6) ms	IT	¹⁵⁷Er	9/2+
¹⁵⁸Er	68	90	157.929893(27)	2.29(6) h	EC	¹⁵⁸Ho	0+
¹⁵⁹Er	68	91	158.930691(4)	36(1) min	β⁺	¹⁵⁹Ho	3/2−
^159m1Er	182.602(24) keV			337(14) ns	IT	¹⁵⁹Er	9/2+
^159m2Er	429.05(3) keV			590(60) ns	IT	¹⁵⁹Er	11/2−
¹⁶⁰Er	68	92	159.929077(26)	28.58(9) h	EC	¹⁶⁰Ho	0+
¹⁶¹Er	68	93	160.930004(9)	3.21(3) h	β⁺	¹⁶¹Ho	3/2−
^161mEr	396.44(4) keV			7.5(7) μs	IT	¹⁶¹Er	11/2−
¹⁶²Er	68	94	161.9287873(8)	Observationally Stable^{[n 9]}			0+	0.00139(5)
^162mEr	2.02601(13) MeV			88(16) ns	IT	¹⁶²Er	7(-)
¹⁶³Er	68	95	162.930040(5)	75.0(4) min	β⁺	¹⁶³Ho	5/2−
^163mEr	445.5(6) keV			580(100) ns	IT	¹⁶³Er	(11/2−)
¹⁶⁴Er	68	96	163.9292077(8)	Observationally Stable^{[n 10]}			0+	0.01601(3)
¹⁶⁵Er	68	97	164.9307335(10)	10.36(4) h	EC	¹⁶⁵Ho	5/2−
^165m1Er	551.3(6) keV			250(30) ns	IT	¹⁶⁵Er	11/2-
^165m2Er	1.8230(6) MeV			370(40) ns	IT	¹⁶⁵Er	(19/2)
¹⁶⁶Er	68	98	165.9303011(4)	Observationally Stable^{[n 11]}			0+	0.33503(36)
¹⁶⁷Er	68	99	166.9320562(3)	Observationally Stable^{[n 12]}			7/2+	0.22869(9)
^167mEr	207.801(5) keV			2.269(6) s	IT	¹⁶⁷Er	1/2−
¹⁶⁸Er	68	100	167.93237828(28)	Observationally Stable^{[n 13]}			0+	0.26978(18)
^168mEr	1.0940383(16) MeV			109.0(7) ns	IT	¹⁶⁸Er	4-
¹⁶⁹Er	68	101	168.9345984(3)	9.392(18) d	β⁻	¹⁶⁹Tm	1/2−
^169m1Er	92.05(10) keV			285(20) ns	IT	¹⁶⁹Er	(5/2)-
^169m2Er	243.69(17) keV			200(10) ns	IT	¹⁶⁹Er	7/2+
¹⁷⁰Er	68	102	169.9354719(15)	Observationally Stable^{[n 14]}			0+	0.14910(36)
¹⁷¹Er	68	103	170.9380374(15)	7.516(2) h	β⁻	¹⁷¹Tm	5/2−
^171mEr	198.61(9) keV			210(10) ns	IT	¹⁷¹Er	1/2−
¹⁷²Er	68	104	171.939363(4)	49.3(5) h	β⁻	¹⁷²Tm	0+
^172mEr	1.5009(3) MeV			579(62) ns	IT	¹⁷²Er	(6+)
¹⁷³Er	68	105	172.94240(21)#	1.434(17) min	β⁻	¹⁷³Tm	(7/2−)
¹⁷⁴Er	68	106	173.94423(32)#	3.2(2) min	β⁻	¹⁷⁴Tm	0+
^174mEr	1.1115(7) MeV			3.9(3) s	IT	¹⁷⁴Er	8-
¹⁷⁵Er	68	107	174.94777(43)#	1.2(3) min	β⁻	¹⁷⁵Tm	9/2+#
¹⁷⁶Er	68	108	175.94994(43)#	12# s [>300 ns]			0+
¹⁷⁷Er	68	109	176.95399(54)#	8# s [>300 ns]			1/2−#
¹⁷⁸Er	68	110	177.95678(64)#	4# s [>300 ns]			0+
¹⁷⁹Er	68	111	178.96127(54)#	3# s [>550 ns)]			3/2−#
¹⁸⁰Er	68	112	179.96438(54)#	2# s [>550 ns]			0+
This table header & footer: view

[n 1]
^mEr – Excited nuclear isomer.
[n 2]
( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
[n 3]
# – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
[n 4]
# – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
[n 5]
Modes of decay:

EC: Electron capture

IT: Isomeric transition

p: Proton emission
[n 6]
Bold symbol as daughter – Daughter product is stable.
[n 7]
( ) spin value – Indicates spin with weak assignment arguments.
[n 8]
Order of ground state and isomer is uncertain.
[n 9]
Believed to undergo α decay to ¹⁵⁸Dy or β⁺β⁺ to ¹⁶²Dy with a half-life over 1.40×10¹⁴ years
[N 10]
Believed to undergo α decay to ¹⁶⁰Dy or β⁺β⁺ to ¹⁶⁴Dy
[N 11]
Believed to undergo α decay to ¹⁶²Dy
[N 12]
Believed to undergo α decay to ¹⁶³Dy
[N 13]
Believed to undergo α decay to ¹⁶⁴Dy
[N 14]
Believed to undergo α decay to ¹⁶⁶Dy or β⁻β⁻ to ¹⁷⁰Yb with a half-life over 4.10×10¹⁷ years

Isotopes of erbium

List of isotopes

See also

References

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