Isotopes of cerium

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Naturally occurring cerium (58Ce) is composed of 4 stable isotopes: 136Ce, 138Ce, 140Ce, and 142Ce, with 140Ce being the most abundant (88.45% natural abundance) and the only one that is theoretically stable. The others, 136Ce, 138Ce, and 142Ce are predicted to undergo double beta decay, which has never been observed. There are 35 radioisotopes that have been characterized, with the most stable being 144Ce, with a half-life of 284.89 days; 139Ce, with a half-life of 137.64 days and 141Ce, with a half-life of 32.505 days. All of the remaining radioactive isotopes have half-lives that are less than 4 days and the majority of these have half-lives that are less than 10 minutes.

Quick facts Main isotopes, Decay ...
Isotopes of cerium (58Ce)
Main isotopes[1] Decay
Isotope abun­dance half-life (t1/2) mode pro­duct
134Ce synth 3.16 d ε 134La
136Ce 0.186% stable
138Ce 0.251% stable
139Ce synth 137.64 d ε 139La
140Ce 88.4% stable
141Ce synth 32.505 d β− 141Pr
142Ce 11.1% stable
143Ce synth 33.039 h β− 143Pr
144Ce synth 284.89 d β− 144Pr
Standard atomic weight Ar°(Ce)
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The known isotopes of cerium range from 121Ce to 157Ce, in addition to 14 meta states.

List of isotopes

More information Nuclide, Z ...
Nuclide
[n 1]		 Z N Isotopic mass (Da)[4]
[n 2][n 3]		 Discovery
year[5][6]		 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)
Excitation energy Normal proportion[1] Range of variation
119Ce[7] 58 61 118.95296(54)# 2025 200# ms
[>310 ns]		 5/2+#
120Ce[7] 58 62 119.94661(54)# 2025 250# ms
[>310 ns]		 0+
121Ce 58 63 120.94344(43)# 1997 1.1(1) s β+ (99%) 121La 5/2(+#)
β+, p (1%) 120Ba
122Ce 58 64 121.93787(43)# 2005 2# s β+ 122La 0+
123Ce 58 65 122.93528(32)# 1984 3.8(2) s β+ (?%) 123La (5/2)(+#)
β+, p (?%) 122Ba
124Ce 58 66 123.93031(32)# 1978 9.1(12) s β+ 124La 0+
125Ce 58 67 124.92844(21)# 1978 9.7(3) s β+ (?%) 125La (7/2−)
β+, p (?%) 124Ba
125mCe 93.6(4) keV 2007 13(10) s IT 125Ce (1/2+)
126Ce 58 68 125.923971(30) 1978 51.0(3) s β+ 126La 0+
127Ce 58 69 126.922727(31) 1978 34(2) s β+ 127La (1/2+)
127m1Ce 7.3(11) keV 1996 28.6(7) s β+ 127La (5/2+)
127m2Ce 36.9(11) keV 1994 >10 μs IT 127Ce (7/2−)
128Ce 58 70 127.918911(30) 1968 3.93(2) min β+ 128La 0+
129Ce 58 71 128.918102(30) 1977 3.5(3) min β+ 129La (5/2+)
130Ce 58 72 129.914736(30) 1965 22.9(5) min β+ 130La 0+
130mCe 2453.6(3) keV 1984 100(8) ns IT 130Ce 7−
131Ce 58 73 130.914429(35) 1966 10.3(3) min β+ 131La 7/2+
131mCe 63.09(9) keV 1966 5.4(4) min β+ 131La (1/2+)
132Ce 58 74 131.911466(22) 1960 3.51(11) h β+ 132La 0+
132mCe 2341.15(21) keV 1968 9.4(3) ms IT 132Ce 8−
133Ce 58 75 132.911520(18) 1951 97(4) min β+ 133La 1/2+
133mCe 37.2(7) keV 1967 5.1(3) h β+ 133La 9/2−
134Ce 58 76 133.908928(22) 1951 3.16(4) d EC 134La 0+
134mCe 3208.6(4) keV 1980 308(5) ns IT 134Ce 10+
135Ce 58 77 134.909161(11) 1948 17.7(3) h β+ 135La 1/2+
135mCe 445.81(21) keV 1970 20(1) s IT 135Ce (11/2−)
136Ce 58 78 135.90712926(35) 1936 Observationally stable[n 8] 0+ 0.00186(2)
136mCe 3095.0(6) keV 1975 1.96(9) μs IT 136Ce 10+
137Ce 58 79 136.90776242(39) 1948 9.0(3) h β+ 137La 3/2+
137mCe 254.29(5) keV 1955 34.4(3) h IT (99.21%) 137Ce 11/2−
β+ (0.79%) 137La
138Ce 58 80 137.90599418(54) 1936 Observationally stable[n 9] 0+ 0.00251(2)
138mCe 2129.28(12) keV 1960 8.73(20) ms IT 138Ce 7-
139Ce 58 81 138.9066470(22) 1948 137.642(20) d EC 139La 3/2+
139mCe 754.24(8) keV 1956 57.58(32) s IT 139Ce 11/2−
140Ce[n 10] 58 82 139.9054484(14) 1924 Stable 0+ 0.88449(51)
140mCe 2107.854(24) keV 1964 7.3(15) μs IT 140Ce 6+
141Ce[n 10] 58 83 140.9082860(14) 1951 32.505(10) d β− 141Pr 7/2−
142Ce[n 10] 58 84 141.9092502(26) 1924 Observationally stable[n 11][8] 0+ 0.11114(51)
143Ce[n 10] 58 85 142.9123920(26) 1951 33.039(6) h β− 143Pr 3/2−
144Ce[n 10] 58 86 143.9136528(30) 1946 284.886(25) d β− 144Pr 0+
145Ce 58 87 144.917265(36) 1954 3.01(6) min β− 145Pr 5/2−#
146Ce 58 88 145.918812(16) 1953 13.49(16) min β− 146Pr 0+
147Ce 58 89 146.9226899(92) 1964 56.4(10) s β− 147Pr (5/2−)
148Ce 58 90 147.924424(12) 1964 56.8(3) s β− 148Pr 0+
149Ce 58 91 148.928427(11) 1971 4.94(4) s β− 149Pr 3/2−#
150Ce 58 92 149.930384(13) 1970 6.05(7) s β− 150Pr 0+
151Ce 58 93 150.934272(19) 1997 1.76(6) s β− 151Pr (3/2−)
152Ce 58 94 151.93668(22)# 1990 1.42(2) s β− 152Pr 0+
153Ce 58 95 152.94105(22)# 1994 865(25) ms β− 153Pr 3/2−#
154Ce 58 96 153.94394(22)# 1994 722(14) ms β− 154Pr 0+
155Ce 58 97 154.94871(32)# 1994 313(7) ms β− 155Pr 5/2−#
156Ce 58 98 155.95188(32)# 2017 233(9) ms β− 156Pr 0+
157Ce 58 99 156.95713(43)# 2017 175(41) ms β− 157Pr 7/2+#
158Ce 58 100 157.96077(43)# 2017 99(93) ms β− 158Pr 0+
159Ce[9] 58 101 158.96636(54)# 2026 1/2−#
160Ce[9] 58 102 2026 0+
This table header & footer:
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  1. [1]
    mCe – Excited nuclear isomer.
  2. [2]
    ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
  3. [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. [4]
    # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
  5. [5]
    Modes of decay:
    EC:Electron capture
    IT:Isomeric transition
    p:Proton emission
  6. [6]
    Bold symbol as daughter – Daughter product is stable.
  7. [7]
    ( ) spin value – Indicates spin with weak assignment arguments.
  8. [8]
    Theorized to undergo β+β+ decay to 136Ba with a half-life over 3.2×1016 years
  9. [9]
    Theorized to undergo β+β+ decay to 138Ba with a half-life over 4.4×1016 years
  10. [10]
    Fission product
  11. [11]
    Theorized to undergo β−β− decay to 142Nd or α decay to 138Ba with a half-life over 2.9×1018 years

See also

Daughter products other than cerium

References

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