Isotopes of Samarium - Table

Table

nuclide
symbol		 Z(p) N(n)
isotopic mass (u)
 half-life decay
mode(s)		 daughter
isotope(s)		 nuclear
spin		 representative
isotopic
composition
(mole fraction)		 range of natural
variation
(mole fraction)
excitation energy
128Sm 62 66 127.95808(54)# 0.5# s 0+
129Sm 62 67 128.95464(54)# 550(100) ms 5/2+#
130Sm 62 68 129.94892(43)# 1# s β+ 130Pm 0+
131Sm 62 69 130.94611(32)# 1.2(2) s β+ 131Pm 5/2+#
β+, p (rare) 130Nd
132Sm 62 70 131.94069(32)# 4.0(3) s β+ 132Pm 0+
β+, p 131Nd
133Sm 62 71 132.93867(21)# 2.90(17) s β+ 133Pm (5/2+)
β+, p 132Nd
134Sm 62 72 133.93397(21)# 10(1) s β+ 134Pm 0+
135Sm 62 73 134.93252(17) 10.3(5) s β+ (99.98%) 135Pm (7/2+)
β+, p (.02%) 134Nd
135mSm 0(300)# keV 2.4(9) s β+ 135Pm (3/2+,5/2+)
136Sm 62 74 135.928276(13) 47(2) s β+ 136Pm 0+
136mSm 2264.7(11) keV 15(1) µs (8-)
137Sm 62 75 136.92697(5) 45(1) s β+ 137Pm (9/2-)
137mSm 180(50)# keV 20# s β+ 137Pm 1/2+#
138Sm 62 76 137.923244(13) 3.1(2) min β+ 138Pm 0+
139Sm 62 77 138.922297(12) 2.57(10) min β+ 139Pm 1/2+
139mSm 457.40(22) keV 10.7(6) s IT (93.7%) 139Sm 11/2-
β+ (6.3%) 139Pm
140Sm 62 78 139.918995(13) 14.82(12) min β+ 140Pm 0+
141Sm 62 79 140.918476(9) 10.2(2) min β+ 141Pm 1/2+
141mSm 176.0(3) keV 22.6(2) min β+ (99.69%) 141Pm 11/2-
IT (.31%) 141Sm
142Sm 62 80 141.915198(6) 72.49(5) min β+ 142Pm 0+
143Sm 62 81 142.914628(4) 8.75(8) min β+ 143Pm 3/2+
143m1Sm 753.99(16) keV 66(2) s IT (99.76%) 143Sm 11/2-
β+ (.24%) 143Pm
143m2Sm 2793.8(13) keV 30(3) ms 23/2(-)
144Sm 62 82 143.911999(3) Observationally Stable 0+ 0.0307(7)
144mSm 2323.60(8) keV 880(25) ns 6+
145Sm 62 83 144.913410(3) 340(3) d EC 145Pm 7/2-
145mSm 8786.2(7) keV 990(170) ns
 (49/2+)
146Sm 62 84 145.913041(4) 1.03(5)×108 a α 142Nd 0+ Trace
147Sm 62 85 146.9148979(26) 1.06(2)×1011 a α 143Nd 7/2- 0.1499(18)
148Sm 62 86 147.9148227(26) 7(3)×1015 a α 144Nd 0+ 0.1124(10)
149Sm 62 87 148.9171847(26) Observationally Stable 7/2- 0.1382(7)
150Sm 62 88 149.9172755(26) Observationally Stable 0+ 0.0738(1)
151Sm 62 89 150.9199324(26) 90(8) a β- 151Eu 5/2-
151mSm 261.13(4) keV 1.4(1) µs (11/2)-
152Sm 62 90 151.9197324(27) Observationally Stable 0+ 0.2675(16)
153Sm 62 91 152.9220974(27) 46.284(4) h β- 153Eu 3/2+
153mSm 98.37(10) keV 10.6(3) ms IT 153Sm 11/2-
154Sm 62 92 153.9222093(27) Observationally Stable 0+ 0.2275(29)
155Sm 62 93 154.9246402(28) 22.3(2) min β- 155Eu 3/2-
156Sm 62 94 155.925528(10) 9.4(2) h β- 156Eu 0+
156mSm 1397.55(9) keV 185(7) ns 5-
157Sm 62 95 156.92836(5) 8.03(7) min β- 157Eu (3/2-)
158Sm 62 96 157.92999(8) 5.30(3) min β- 158Eu 0+
159Sm 62 97 158.93321(11) 11.37(15) s β- 159Eu 5/2-
160Sm 62 98 159.93514(21)# 9.6(3) s β- 160Eu 0+
161Sm 62 99 160.93883(32)# 4.8(8) s β- 161Eu 7/2+#
162Sm 62 100 161.94122(54)# 2.4(5) s β- 162Eu 0+
163Sm 62 101 162.94536(75)# 1# s β- 163Eu 1/2-#
164Sm 62 102 163.94828(86)# 500# ms β- 164Eu 0+
165Sm 62 103 164.95298(97)# 200# ms β- 165Eu 5/2-#

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