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Isotopes of cerium#Cerium-142

{{Short description|none}}

{{Infobox cerium isotopes}}

Naturally occurring cerium (58Ce) is composed of 4 stable isotopes: 136Ce, 138Ce, 140Ce, and 142Ce, with 140Ce being the most abundant (88.48% natural abundance) and the only one theoretically stable; 136Ce, 138Ce, and 142Ce are predicted to undergo double beta decay but this process has never been observed. There are 35 radioisotopes that have been characterized, with the most stable being 144Ce, with a half-life of 284.893 days; 139Ce, with a half-life of 137.640 days and 141Ce, with a half-life of 32.501 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. This element also has 10 meta states.

The isotopes of cerium range in atomic weight from 119 u (119Ce) to 157 u (157Ce).

List of isotopes

{{Anchor|Cerium-119|Cerium-120|Cerium-159}}

{{Isotopes table

| symbol = Ce

| refs = NUBASE2020, AME2020 II

| notes = m, unc(), mass#, hl#, spin(), spin#, daughter-st, p, EC, IT,

}}

|-id=Cerium-121

| rowspan=2|121Ce

| rowspan=2 style="text-align:right" | 58

| rowspan=2 style="text-align:right" | 63

| rowspan=2|120.94344(43)#

| rowspan=2|1.1(1) s

| β+ (99%)

| 121La

| rowspan=2|5/2(+#)

| rowspan=2|

| rowspan=2|

|-

| β+, p (1%)

| 120Ba

|-id=Cerium-122

| 122Ce

| style="text-align:right" | 58

| style="text-align:right" | 64

| 121.93787(43)#

| 2# s

| β+

| 122La

| 0+

|

|

|-id=Cerium-123

| rowspan=2|123Ce

| rowspan=2 style="text-align:right" | 58

| rowspan=2 style="text-align:right" | 65

| rowspan=2|122.93528(32)#

| rowspan=2|3.8(2) s

| β+ (?%)

| 123La

| rowspan=2|(5/2)(+#)

| rowspan=2|

| rowspan=2|

|-

| β+, p (?%)

| 122Ba

|-id=Cerium-124

| 124Ce

| style="text-align:right" | 58

| style="text-align:right" | 66

| 123.93031(32)#

| 9.1(12) s

| β+

| 124La

| 0+

|

|

|-id=Cerium-125

| rowspan=2|125Ce

| rowspan=2 style="text-align:right" | 58

| rowspan=2 style="text-align:right" | 67

| rowspan=2|124.92844(21)#

| rowspan=2|9.7(3) s

| β+ (?%)

| 125La

| rowspan=2|(7/2−)

| rowspan=2|

| rowspan=2|

|-

| β+, p (?%)

| 124Ba

|-id=Cerium-125m

| style="text-indent:1em" | 125mCe

| colspan="3" style="text-indent:2em" | 93.6(4) keV

| 13(10) s

| IT

| 125Ce

| (1/2+)

|

|

|-id=Cerium-126

| 126Ce

| style="text-align:right" | 58

| style="text-align:right" | 68

| 125.923971(30)

| 51.0(3) s

| β+

| 126La

| 0+

|

|

|-id=Cerium-127

| 127Ce

| style="text-align:right" | 58

| style="text-align:right" | 69

| 126.922727(31)

| 34(2) s

| β+

| 127La

| (1/2+)

|

|

|-id=Cerium-127m1

| style="text-indent:1em" | 127m1Ce

| colspan="3" style="text-indent:2em" | 7.3(11) keV

| 28.6(7) s

| β+

| 127La

| (5/2+)

|

|

|-id=Cerium-127m2

| style="text-indent:1em" | 127m2Ce

| colspan="3" style="text-indent:2em" | 36.9(11) keV

| >10 μs

| IT

| 127Ce

| (7/2−)

|

|

|-id=Cerium-128

| 128Ce

| style="text-align:right" | 58

| style="text-align:right" | 70

| 127.918911(30)

| 3.93(2) min

| β+

| 128La

| 0+

|

|

|-id=Cerium-129

| 129Ce

| style="text-align:right" | 58

| style="text-align:right" | 71

| 128.918102(30)

| 3.5(3) min

| β+

| 129La

| (5/2+)

|

|

|-id=Cerium-130

| 130Ce

| style="text-align:right" | 58

| style="text-align:right" | 72

| 129.914736(30)

| 22.9(5) min

| β+

| 130La

| 0+

|

|

|-id=Cerium-130m

| style="text-indent:1em" | 130mCe

| colspan="3" style="text-indent:2em" | 2453.6(3) keV

| 100(8) ns

| IT

| 130Ce

| 7−

|

|

|-id=Cerium-131

| 131Ce

| style="text-align:right" | 58

| style="text-align:right" | 73

| 130.914429(35)

| 10.3(3) min

| β+

| 131La

| 7/2+

|

|

|-id=Cerium-131m

| style="text-indent:1em" | 131mCe

| colspan="3" style="text-indent:2em" | 63.09(9) keV

| 5.4(4) min

| β+

| 131La

| (1/2+)

|

|

|-id=Cerium-132

| 132Ce

| style="text-align:right" | 58

| style="text-align:right" | 74

| 131.911466(22)

| 3.51(11) h

| β+

| 132La

| 0+

|

|

|-id=Cerium-132m

| style="text-indent:1em" | 132mCe

| colspan="3" style="text-indent:2em" | 2341.15(21) keV

| 9.4(3) ms

| IT

| 132Ce

| 8−

|

|

|-id=Cerium-133

| 133Ce

| style="text-align:right" | 58

| style="text-align:right" | 75

| 132.911520(18)

| 97(4) min

| β+

| 133La

| 1/2+

|

|

|-id=Cerium-133m

| style="text-indent:1em" | 133mCe

| colspan="3" style="text-indent:2em" | 37.2(7) keV

| 5.1(3) h

| β+

| 133La

| 9/2−

|

|

|-id=Cerium-134

| 134Ce

| style="text-align:right" | 58

| style="text-align:right" | 76

| 133.908928(22)

| 3.16(4) d

| EC

| 134La

| 0+

|

|

|-id=Cerium-134m

| style="text-indent:1em" | 134mCe

| colspan="3" style="text-indent:2em" | 3208.6(4) keV

| 308(5) ns

| IT

| 134Ce

| 10+

|

|

|-id=Cerium-135

| 135Ce

| style="text-align:right" | 58

| style="text-align:right" | 77

| 134.909161(11)

| 17.7(3) h

| β+

| 135La

| 1/2+

|

|

|-id=Cerium-135m

| style="text-indent:1em" | 135mCe

| colspan="3" style="text-indent:2em" | 445.81(21) keV

| 20(1) s

| IT

| 135Ce

| (11/2−)

|

|

|-id=Cerium-136

| 136Ce

| style="text-align:right" | 58

| style="text-align:right" | 78

| 135.90712926(35)

| colspan=3 align=center|Observationally StableTheorized to undergo β+β+ decay to 136Ba with a half-life over 3.2×1016 years

| 0+

| 0.00186(2)

|

|-id=Cerium-136m

| style="text-indent:1em" | 136mCe

| colspan="3" style="text-indent:2em" | 3095.0(6) keV

| 1.96(9) μs

| IT

| 136Ce

| 10+

|

|

|-id=Cerium-137

| 137Ce

| style="text-align:right" | 58

| style="text-align:right" | 79

| 136.90776242(39)

| 9.0(3) h

| β+

| 137La

| 3/2+

|

|

|-id=Cerium-137m

| rowspan=2 style="text-indent:1em" | 137mCe

| rowspan=2 colspan="3" style="text-indent:2em" | 254.29(5) keV

| rowspan=2|34.4(3) h

| IT (99.21%)

| 137Ce

| rowspan=2|11/2−

| rowspan=2|

| rowspan=2|

|-

| β+ (0.79%)

| 137La

|-id=Cerium-138

| 138Ce

| style="text-align:right" | 58

| style="text-align:right" | 80

| 137.90599418(54)

| colspan=3 align=center|Observationally StableTheorized to undergo β+β+ decay to 138Ba with a half-life over 4.4×1016 years

| 0+

| 0.00251(2)

|

|-id=Cerium-138m

| style="text-indent:1em" | 138mCe

| colspan="3" style="text-indent:2em" | 2129.28(12) keV

| 8.73(20) ms

| IT

| 138Ce

| 7-

|

|

|-id=Cerium-139

| 139Ce

| style="text-align:right" | 58

| style="text-align:right" | 81

| 138.9066470(22)

| 137.642(20) d

| EC

| 139La

| 3/2+

|

|

|-id=Cerium-139m

| style="text-indent:1em" | 139mCe

| colspan="3" style="text-indent:2em" | 754.24(8) keV

| 57.58(32) s

| IT

| 139Ce

| 11/2−

|

|

|-id=Cerium-140

| 140CeFission product

| style="text-align:right" | 58

| style="text-align:right" | 82

| 139.9054484(14)

| colspan=3 align=center|Stable

| 0+

| 0.88449(51)

|

|-id=Cerium-140m

| style="text-indent:1em" | 140mCe

| colspan="3" style="text-indent:2em" | 2107.854(24) keV

| 7.3(15) μs

| IT

| 140Ce

| 6+

|

|

|-id=Cerium-141

| 141Ce

| style="text-align:right" | 58

| style="text-align:right" | 83

| 140.9082860(14)

| 32.505(10) d

| β−

| 141Pr

| 7/2−

|

|

|-id=Cerium-142

| 142Ce

| style="text-align:right" | 58

| style="text-align:right" | 84

| 141.9092502(26)

| colspan=3 align=center|Observationally StableTheorized to undergo β−β− decay to 142Nd or α decay to 138Ba with a half-life over 2.9×1018 years{{cite journal |last1=Belli |first1=P. |last2=Bernabei |first2=R. |last3=Danevich |first3=F. A. |last4=Incicchitti |first4=A. |last5=Tretyak |first5=V. I. |title=Experimental searches for rare alpha and beta decays |date=2019 |journal=European Physical Journal A |volume=55 |number=140 |pages=4–6 |doi=10.1140/epja/i2019-12823-2|arxiv=1908.11458 |bibcode=2019EPJA...55..140B |s2cid=254103706 }}

| 0+

| 0.11114(51)

|

|-id=Cerium-143

| 143Ce

| style="text-align:right" | 58

| style="text-align:right" | 85

| 142.9123920(26)

| 33.039(6) h

| β−

| 143Pr

| 3/2−

|

|

|-id=Cerium-144

| 144Ce

| style="text-align:right" | 58

| style="text-align:right" | 86

| 143.9136528(30)

| 284.886(25) d

| β−

| 144Pr

| 0+

|

|

|-id=Cerium-145

| 145Ce

| style="text-align:right" | 58

| style="text-align:right" | 87

| 144.917265(36)

| 3.01(6) min

| β−

| 145Pr

| 5/2−#

|

|

|-id=Cerium-146

| 146Ce

| style="text-align:right" | 58

| style="text-align:right" | 88

| 145.918812(16)

| 13.49(16) min

| β−

| 146Pr

| 0+

|

|

|-id=Cerium-147

| 147Ce

| style="text-align:right" | 58

| style="text-align:right" | 89

| 146.9226899(92)

| 56.4(10) s

| β−

| 147Pr

| (5/2−)

|

|

|-id=Cerium-148

| 148Ce

| style="text-align:right" | 58

| style="text-align:right" | 90

| 147.924424(12)

| 56.8(3) s

| β−

| 148Pr

| 0+

|

|

|-id=Cerium-149

| 149Ce

| style="text-align:right" | 58

| style="text-align:right" | 91

| 148.928427(11)

| 4.94(4) s

| β−

| 149Pr

| 3/2−#

|

|

|-id=Cerium-150

| 150Ce

| style="text-align:right" | 58

| style="text-align:right" | 92

| 149.930384(13)

| 6.05(7) s

| β−

| 150Pr

| 0+

|

|

|-id=Cerium-151

| 151Ce

| style="text-align:right" | 58

| style="text-align:right" | 93

| 150.934272(19)

| 1.76(6) s

| β−

| 151Pr

| (3/2−)

|

|

|-id=Cerium-152

| 152Ce

| style="text-align:right" | 58

| style="text-align:right" | 94

| 151.93668(22)#

| 1.42(2) s

| β−

| 152Pr

| 0+

|

|

|-id=Cerium-153

| 153Ce

| style="text-align:right" | 58

| style="text-align:right" | 95

| 152.94105(22)#

| 865(25) ms

| β−

| 153Pr

| 3/2−#

|

|

|-id=Cerium-154

| 154Ce

| style="text-align:right" | 58

| style="text-align:right" | 96

| 153.94394(22)#

| 722(14) ms

| β−

| 154Pr

| 0+

|

|

|-id=Cerium-155

| 155Ce

| style="text-align:right" | 58

| style="text-align:right" | 97

| 154.94871(32)#

| 313(7) ms

| β−

| 155Pr

| 5/2−#

|

|

|-id=Cerium-156

| 156Ce

| style="text-align:right" | 58

| style="text-align:right" | 98

| 155.95188(32)#

| 233(9) ms

| β−

| 156Pr

| 0+

|

|

|-id=Cerium-157

| 157Ce

| style="text-align:right" | 58

| style="text-align:right" | 99

| 156.95713(43)#

| 175(41) ms

| β−

| 157Pr

| 7/2+#

|

|

|-id=Cerium-158

| 158Ce

| style="text-align:right" | 58

| style="text-align:right" | 100

| 157.96077(43)#

| 99(93) ms

| β−

| 158Pr

| 0+

|

|

{{Isotopes table/footer}}

References

{{Reflist}}

  • Isotope masses from:
  • {{NUBASE 2003}}
  • Isotopic compositions and standard atomic masses from:
  • {{CIAAW2003}}
  • {{CIAAW 2005}}
  • Half-life, spin, and isomer data selected from the following sources.
  • {{NUBASE 2003}}
  • {{NNDC}}
  • {{CRC85|chapter=11}}

{{Navbox element isotopes}}

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Category:Cerium

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