Isotopes of cerium

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Isotopes of cerium (58Ce)
Main isotopes[1] Decay
abun­dance half-life (t1/2) mode pro­duct
134Ce synth 3.16 d ε
134La
136Ce 0.186%
stable
138Ce 0.251% stable
139Ce synth 137.640 d ε
139La
140Ce 88.4% stable
141Ce synth 32.501 d
β−
141Pr
142Ce 11.1% stable
143Ce synth 33.039 h β−
143Pr
144Ce synth 284.893 d β−
144Pr
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    • Naturally occurring

    meta states
    .

    The isotopes of cerium range in

    u
    (119Ce) to 157 u (157Ce).

    List of isotopes

    Nuclide
    [n 1]     		Z N Isotopic mass (Da)
    [n 2][n 3]     		Half-life
    [n 4]
    Decay
    mode
    [n 5]
    		 Daughter
    isotope
    [n 6]
    Spin and
    parity
    [n 7][n 4]
    		 Natural abundance (mole fraction)
    Excitation energy Normal proportion Range of variation
    119Ce 58 61 118.95276(64)# 200# ms β+ 119La 5/2+#
    120Ce 58 62 119.94664(75)# 250# ms β+ 120La 0+
    121Ce 58 63 120.94342(54)# 1.1(1) s β+ 121La (5/2)(+#)
    122Ce 58 64 121.93791(43)# 2# s β+ 122La 0+
    β+, p 121Ba
    123Ce 58 65 122.93540(32)# 3.8(2) s β+ 123La (5/2)(+#)
    β+, p 122Ba
    124Ce 58 66 123.93041(32)# 9.1(12) s β+ 124La 0+
    125Ce 58 67 124.92844(21)# 9.3(3) s β+ 125La (7/2−)
    β+, p 124Ba
    126Ce 58 68 125.92397(3) 51.0(3) s β+ 126La 0+
    127Ce 58 69 126.92273(6) 29(2) s β+ 127La 5/2+#
    128Ce 58 70 127.91891(3) 3.93(2) min β+ 128La 0+
    129Ce 58 71 128.91810(3) 3.5(3) min β+ 129La (5/2+)
    130Ce 58 72 129.91474(3) 22.9(5) min β+ 130La 0+
    130mCe 2453.6(3) keV 100(8) ns (7−)
    131Ce 58 73 130.91442(4) 10.2(3) min β+ 131La (7/2+)
    131mCe 61.8(1) keV 5.0(10) min β+ 131La (1/2+)
    132Ce 58 74 131.911460(22) 3.51(11) h β+ 132La 0+
    132mCe 2340.8(5) keV 9.4(3) ms
    IT
    		 132Ce (8−)
    133Ce 58 75 132.911515(18) 97(4) min β+ 133La 1/2+
    133mCe 37.1(8) keV 4.9(4) d β+ 133La 9/2−
    134Ce 58 76 133.908925(22) 3.16(4) d EC 134La 0+
    135Ce 58 77 134.909151(12) 17.7(3) h β+ 135La 1/2(+)
    135mCe 445.8(2) keV 20(1) s IT 135Ce (11/2−)
    136Ce 58 78 135.907172(14)
    Observationally Stable[n 8]
    		 0+ 0.00185(2) 0.00185–0.00186
    136mCe 3095.5(4) keV 2.2(2) µs 10+
    137Ce 58 79 136.907806(14) 9.0(3) h β+ 137La 3/2+
    137mCe 254.29(5) keV 34.4(3) h IT (99.22%) 137Ce 11/2−
    β+ (.779%) 137La
    138Ce 58 80 137.905991(11) Observationally Stable[n 9] 0+ 0.00251(2) 0.00251–0.00254
    138mCe 2129.17(12) keV 8.65(20) ms IT 138Ce 7-
    139Ce 58 81 138.906653(8) 137.641(20) d EC 139La 3/2+
    139mCe 754.24(8) keV 56.54(13) s IT 139Ce 11/2−
    140Ce[n 10] 58 82 139.9054387(26) Stable 0+ 0.88450(51) 0.88446–0.88449
    140mCe 2107.85(3) keV 7.3(15) µs 6+
    141Ce[n 10] 58 83 140.9082763(26) 32.508(13) d β− 141Pr 7/2−
    142Ce[n 10] 58 84 141.909244(3) Observationally Stable[n 11] 0+ 0.11114(51) 0.11114–0.11114
    143Ce[n 10] 58 85 142.912386(3) 33.039(6) h β− 143Pr 3/2−
    144Ce[n 10] 58 86 143.913647(4) 284.91(5) d β− 144mPr 0+
    145Ce 58 87 144.91723(4) 3.01(6) min β− 145Pr (3/2−)
    146Ce 58 88 145.91876(7) 13.52(13) min β− 146Pr 0+
    147Ce 58 89 146.92267(3) 56.4(10) s β− 147Pr (5/2−)
    148Ce 58 90 147.92443(3) 56(1) s β− 148Pr 0+
    149Ce 58 91 148.9284(1) 5.3(2) s β− 149Pr (3/2−)#
    150Ce 58 92 149.93041(5) 4.0(6) s β− 150Pr 0+
    151Ce 58 93 150.93398(11) 1.02(6) s β− 151Pr 3/2−#
    152Ce 58 94 151.93654(21)# 1.4(2) s β− 152Pr 0+
    153Ce 58 95 152.94058(43)# 500# ms [>300 ns] β− 153Pr 3/2−#
    154Ce 58 96 153.94342(54)# 300# ms [>300 ns] β− 154Pr 0+
    155Ce 58 97 154.94804(64)# 200# ms [>300 ns] β− 155Pr 5/2−#
    156Ce 58 98 155.95126(64)# 150# ms β− 156Pr 0+
    157Ce 58 99 156.95634(75)# 50# ms β− 157Pr 7/2+#
    This table header & footer:
    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. ^ a b # – 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 38×1015 years
    9. ^ Theorized to undergo β+β+ decay to 138Ba with a half-life over 150×1012 years
    10. ^
      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[4][5]

    References

    1. doi:10.1088/1674-1137/abddae
      .
    2. ^ "Standard Atomic Weights: Cerium". CIAAW. 1995.
    3. ISSN 1365-3075
      .
    4. doi:10.1088/1674-1137/abddae
      .
    5. S2CID 254103706
      .
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