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词条 Isotopes of cerium
释义

  1. List of isotopes

      Notes  

  2. References

{{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

nuclide
symbol		 Z(p) N(n)  
isotopic mass (u)
 		half-lifedecay
mode(s)[1][2]		daughter
isotope(s)[3]		nuclear
spin and
parity		representative
isotopic
composition
(mole fraction)		range of natural
variation
(mole fraction)
excitation energy
119Ce5861 118.95276(64)# 200# ms β+ 119La 5/2+#
120Ce5862 119.94664(75)# 250# ms β+ 120La 0+
121Ce5863 120.94342(54)# 1.1(1) s β+ 121La (5/2)(+#)
122Ce5864121.93791(43)#2# s β+ 122La0+
β+, p 121Ba
123Ce5865122.93540(32)#3.8(2) s β+ 123La(5/2)(+#)
β+, p 122Ba
124Ce5866 123.93041(32)# 9.1(12) s β+ 124La 0+
125Ce5867124.92844(21)#9.3(3) s β+ 125La(7/2−)
β+, p 124Ba
126Ce5868 125.92397(3) 51.0(3) s β+ 126La 0+
127Ce5869 126.92273(6) 29(2) s β+ 127La 5/2+#
128Ce5870 127.91891(3) 3.93(2) min β+ 128La 0+
129Ce5871 128.91810(3) 3.5(3) min β+ 129La (5/2+)
130Ce5872 129.91474(3) 22.9(5) min β+ 130La 0+
130mCe2453.6(3) keV 100(8) ns (7−)
131Ce5873 130.91442(4) 10.2(3) min β+ 131La (7/2+)
131mCe61.8(1) keV 5.0(10) min β+ 131La (1/2+)
132Ce5874 131.911460(22) 3.51(11) h β+ 132La 0+
132mCe2340.8(5) keV 9.4(3) ms IT 132Ce (8−)
133Ce5875 132.911515(18) 97(4) min β+ 133La 1/2+
133mCe37.1(8) keV 4.9(4) d β+ 133La 9/2−
134Ce5876 133.908925(22) 3.16(4) d EC 134La 0+
135Ce5877 134.909151(12) 17.7(3) h β+ 135La 1/2(+)
135mCe445.8(2) keV 20(1) s IT 135Ce (11/2−)
136Ce5878 135.907172(14)Observationally Stable[4] 0+ 0.00185(2) 0.00185–0.00186
136mCe3095.5(4) keV 2.2(2) µs 10+
137Ce5879 136.907806(14) 9.0(3) h β+ 137La 3/2+
137mCe254.29(5) keV34.4(3) h IT (99.22%) 137Ce11/2−
β+ (.779%) 137La
138Ce5880 137.905991(11)Observationally Stable[5] 0+ 0.00251(2) 0.00251–0.00254
138mCe2129.17(12) keV 8.65(20) ms IT 138Ce 7-
139Ce5881 138.906653(8) 137.641(20) d EC 139La 3/2+
139mCe754.24(8) keV 56.54(13) s IT 139Ce 11/2−
140Ce[6]5882 139.9054387(26)Stable 0+ 0.88450(51) 0.88446–0.88449
140mCe2107.85(3) keV 7.3(15) µs 6+
141Ce[6]5883 140.9082763(26) 32.508(13) d β− 141Pr 7/2−
142Ce[6]5884 141.909244(3)Observationally Stable[7] 0+ 0.11114(51) 0.11114–0.11114
143Ce[6]5885 142.912386(3) 33.039(6) d β− 143Pr 3/2−
144Ce[6]5886 143.913647(4) 284.91(5) d β− 144mPr 0+
145Ce5887 144.91723(4) 3.01(6) min β− 145Pr (3/2−)
146Ce5888 145.91876(7) 13.52(13) min β− 146Pr 0+
147Ce5889 146.92267(3) 56.4(10) s β− 147Pr (5/2−)
148Ce5890 147.92443(3) 56(1) s β− 148Pr 0+
149Ce5891 148.9284(1) 5.3(2) s β− 149Pr (3/2−)#
150Ce5892 149.93041(5) 4.0(6) s β− 150Pr 0+
151Ce5893 150.93398(11) 1.02(6) s β− 151Pr 3/2−#
152Ce5894 151.93654(21)# 1.4(2) s β− 152Pr 0+
153Ce5895 152.94058(43)# 500# ms [>300 ns] β− 153Pr 3/2−#
154Ce5896 153.94342(54)# 300# ms [>300 ns] β− 154Pr 0+
155Ce5897 154.94804(64)# 200# ms [>300 ns] β− 155Pr 5/2−#
156Ce5898 155.95126(64)# 150# ms β− 156Pr 0+
157Ce5899 156.95634(75)# 50# ms β− 157Pr 7/2+#
1. ^{{cite web |url=http://www.nucleonica.net/unc.aspx |title=Universal Nuclide Chart |publisher=nucleonica |registration=yes}}
2. ^Abbreviations:
EC: Electron capture
IT: Isomeric transition
3. ^Bold for stable isotopes
4. ^Theorized to undergo β+β+ decay to 136Ba with a half-life over 38×1015 years
5. ^Theorized to undergo β+β+ decay to 138Ba with a half-life over 150×1012 years
6. ^1 2 3 4 Fission product
7. ^Theorized to undergo β−β− decay to 142Nd with a half-life over 50×1015 years

Notes

  • Evaluated isotopic composition is for most but not all commercial samples.
  • Geologically exceptional samples are known in which the isotopic composition lies outside the reported range. The uncertainty in the atomic mass may exceed the stated value for such specimens.
  • Values marked # are not purely derived from experimental data, but at least partly from systematic trends. Spins with weak assignment arguments are enclosed in parentheses.
  • Uncertainties are given in concise form in parentheses after the corresponding last digits. Uncertainty values denote one standard deviation, except isotopic composition and standard atomic mass from IUPAC, which use expanded uncertainties.

References

  • Isotope masses from:
    • {{NUBASE 2003}}
  • Isotopic compositions and standard atomic masses from:
    • {{CAWIA 2003}}
    • {{CIAAW 2005}}
  • Half-life, spin, and isomer data selected from the following sources. See editing notes on this article's talk page.
    • {{NUBASE 2003}}
    • {{NNDC}}
    • {{CRC85|chapter=11}}
{{Navbox element isotopes}}

3 : Cerium|Isotopes of cerium|Lists of isotopes by element
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