Isotopes of cerium

Template:Infobox cerium isotopes 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.

The known isotopes of cerium range from 121Ce to 157Ce, in addition to 14 meta states.

## List of isotopes

Nuclide
[n 1] | Z | N | Isotopic mass (u)
[n 2][n 3] | Half-life
[n 4] | Decay
mode
[n 5] | Daughter
isotope
[n 6] | Spin and
parity
[n 7][n 4] | Physics:Natural abundance (mole fraction)

|
|
|
|
|
|
|
|

Excitation energy  | Normal proportion  | Range of variation
118Ce  | 58  | 60  |  | 2026 |  |  |  |  |  |
119Ce[1] | 58  | 61  | 118.95296(54)#  | 2025 | 200# ms
[>310 ns]  |  |  | 5/2+#  |  |
120Ce[1] | 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] | 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[3] | 58  | 101  | 158.96636(54)#  | 2026 |  |  |  | 1/2−#  |  |
160Ce[3] | 58  | 102  |  | 2026 |  |  |  | 0+  |  |

1. ↑ mCe - Excited nuclear isomer.
2. ↑ ( ) - Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
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. ↑ 4.0 4.1 # - Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
5. ↑ Modes of decay:  EC: | Electron capture

|

IT: | Isomeric transition

p: | Proton emission
6. ↑ Bold symbol as daughter - Daughter product is stable.
7. ↑ ( ) spin value - Indicates spin with weak assignment arguments.
8. ↑ Theorized to undergo β+β+ decay to 136Ba with a half-life over 3.2×1016 years
9. ↑ Theorized to undergo β+β+ decay to 138Ba with a half-life over 4.4×1016 years
10. ↑ 10.0 10.1 10.2 10.3 10.4 Fission product
11. ↑ Theorized to undergo β−β− decay to 142Nd or α decay to 138Ba with a half-life over 2.9×1018 years[2]

## See also

Daughter products other than cerium

* Isotopes of praseodymium
* Isotopes of lanthanum
* Isotopes of barium

## References

1. ↑ 1.0 1.1 Suzuki, H; Fukuda, N; Takeda, H; Shimizu, Y; Yoshimoto, M; Togano, Y; Sato, H; Kitamura, N et al. (7 November 2025). "Discovery of Proton-Rich Radioactive Isotopes in the Z = 60 Region Produced by the Projectile Fragmentation of a 345-MeV/Nucleon 238U Beam". Progress of Theoretical and Experimental Physics 2025 (11). doi:10.1093/ptep/ptaf149.
2. ↑ Belli, P.; Bernabei, R.; Danevich, F. A.; Incicchitti, A.; Tretyak, V. I. (2019). "Experimental searches for rare alpha and beta decays". European Physical Journal A 55 (140): 4–6. doi:10.1140/epja/i2019-12823-2. Bibcode: 2019EPJA...55..140B.
3. ↑ 3.0 3.1 Sumikama, Toshiyuki; Fukuda, Naoki; Kubo, Toshiyuki; Suzuki, Hiroshi; Takeda, Hiroyuki; Inabe, Naohito; Kameda, Daisuke; Ahn, Deuk Soon et al. (15 February 2026). "Expanding the Isotopic Frontier: Seven New Neutron-Rich Rare-Earth Isotopes Observed at RIKEN RI Beam Factory". Journal of the Physical Society of Japan 95 (2). doi:10.7566/JPSJ.95.024202.

* v
* t
* e

Isotopes of the chemical elements

| Group | 1 | 2 | 3 |  | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18

|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|

Period | Alkali metals  | Alkaline earth metals  |  |  |  |  |  |  |  |  |  |  |  |  |  | Pnicto­gens  | Chal­co­gens  | Halo­gens  | Noble gases
1 |

Iso's * List

1  |  |

Iso's * List

2 |

Iso's * List

3  |

Iso's * List

4  |  |

Iso's * List

5  |

Iso's * List

6  |

Iso's * List

7  |

Iso's * List

8  |

Iso's * List

9  |

Iso's * List

3 |

Iso's * List

11  |

Iso's * List

12  |  |

Iso's * List

13  |

Iso's * List

14  |

Iso's * List

15  |

Iso's * List

16  |

Iso's * List

17  |

Iso's * List

4 |

Iso's * List

19  |

Iso's * List

20  |

Iso's * List

21  |  |

Iso's * List

22  |

Iso's * List

23  |

Iso's * List

24  |

Iso's * List

25  |

Iso's * List

26  |

Iso's * List

27  |

Iso's * List

28  |

Iso's * List

29  |

Iso's * List

30  |

Iso's * List

31  |

Iso's * List

32  |

Iso's * List

33  |

Iso's * List

34  |

Iso's * List

35  |

Iso's * List

5 |

Iso's * List

37  |

Iso's * List

38  |

Iso's * List

39  |  |

Iso's * List

40  |

Iso's * List

41  |

Iso's * List

42  |

Iso's * List

43  |

Iso's * List

44  |

Iso's * List

45  |

Iso's * List

46  |

Iso's * List

47  |

Iso's * List

48  |

Iso's * List

49  |

Iso's * List

50  |

Iso's * List

51  |

Iso's * List

52  |

Iso's * List

53  |

Iso's * List

6 |

Iso's * List

55  |

Iso's * List

56  |

Iso's * List

57  |  |

Iso's * List

72  |

Iso's * List

73  |

Iso's * List

74  |

Iso's * List

75  |

Iso's * List

76  |

Iso's * List

77  |

Iso's * List

78  |

Iso's * List

79  |

Iso's * List

80  |

Iso's * List

81  |

Iso's * List

82  |

Iso's * List

83  |

Iso's * List

84  |

Iso's * List

85  |

Iso's * List

7 |

Iso's * List

87  |

Iso's * List

88  |

Iso's * List

89  |  |

Iso's * List

104  |

Iso's * List

105  |

Iso's * List

106  |

Iso's * List

107  |

Iso's * List

108  |

Iso's * List

109  |

Iso's * List

110  |

Iso's * List

111  |

Iso's * List

112  |

Iso's * List

113  |

Iso's * List

114  |

Iso's * List

115  |

Iso's * List

116  |

Iso's * List

117  |

Iso's * List

118
|  |  |  |  |

Iso's * List

58  |

Iso's * List

59  |

Iso's * List

60  |

Iso's * List

61  |

Iso's * List

62  |

Iso's * List

63  |

Iso's * List

64  |

Iso's * List

65  |

Iso's * List

66  |

Iso's * List

67  |

Iso's * List

68  |

Iso's * List

69  |

Iso's * List

70  |

Iso's * List

71  |
|  |

Iso's * List

90  |

Iso's * List

91  |

Iso's * List

92  |

Iso's * List

93  |

Iso's * List

94  |

Iso's * List

95  |

Iso's * List

96  |

Iso's * List

97  |

Iso's * List

98  |

Iso's * List

99  |

Iso's * List

100  |

Iso's * List

101  |

Iso's * List

102  |

Iso's * List

103

* Table of nuclides
* Categories: Isotopes
* Tables of nuclides
* Metastable isotopes
* Isotopes by element

0.00

(0 votes)

Original source: https://en.wikipedia.org/wiki/Isotopes of cerium. Read more

|

Retrieved from "https://handwiki.org/wiki/index.php?title=Physics:Isotopes_of_cerium&oldid=4549924"
*[v]: View this template
*[t]: Discuss this template
*[e]: Edit this template