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Isotopes of praseodymium

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Naturally occurring praseodymium (59Pr) is composed of one stable isotope, 141Pr. Forty radioisotopes have been characterized with the most stable being 143Pr, with a half-life of 13.57 days and 142Pr, with a half-life of 19.12 hours. All of the remaining radioactive isotopes have half-lives that are less than six hours and the majority of these have half-lives that are less than 33 seconds. This element also has 19 meta states with the most stable being 138mPr (2.12 hours), 142mPr (14.6 minutes) and 134mPr (~11 minutes).

Quick facts Main isotopes, Decay ...
Isotopes of praseodymium (59Pr)
Main isotopes[1] Decay
Isotope abun­dance half-life (t1/2) mode pro­duct
141Pr 100% stable
142Pr synth 19.12 h β− 142Nd
ε 142Ce
143Pr synth 13.57 d β− 143Nd
Standard atomic weight Ar°(Pr)
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The known isotopes of praseodymium range from 121Pr to 161Pr. The primary decay mode of isotopes lighter than 141Pr is positron emission or electron capture to isotopes of cerium, while that of heavier isotopes is beta decay to isotopes of neodymium.

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][n 7]		 Spin and
parity[1]
[n 8][n 4]		 Isotopic
abundance
Excitation energy[n 4]
120Pr 59 61 2026
121Pr 59 62 120.95539(54)# 2005 12(5) ms p 120Ce (3/2)(+#)
122Pr[7] 59 63 121.95193(54)# 2025 500# ms
[>310 ns]
123Pr[7] 59 64 122.94608(43)# 2025 800# ms
[>310 ns]		 3/2+#
124Pr 59 65 123.94294(43)# 1986 1.2(2) s β+ 124Ce
β+, p (?%) 123La
125Pr 59 66 124.93766(32)# 2002 3.3(7) s β+ 125Ce 3/2+#
126Pr 59 67 125.93524(21)# 1983 3.12(18) s β+ 126Ce (4, 5)
β+, p (?%) 125La
127Pr 59 68 126.93071(21)# 1995 4.2(3) s β+ 127Ce 3/2+#
127mPr 600(200)# keV (1998)[n 9] 2# μs (11/2−)
128Pr 59 69 127.928791(32) 1985 2.85(9) s β+ 128Ce (3+)
β+, p (?%) 127La
129Pr 59 70 128.925095(32) 1977 30(4) s β+ 129Ce (3/2+)
129mPr 382.57(24) keV (1997)[n 9] 26(11)# μs IT 129Pr (11/2−)
130Pr 59 71 129.923590(69) 1977 40.0(4) s β+ 130Ce (6, 7)(+#)
130mPr 100(100)# keV (1990)[n 10] 10# s 2+#
131Pr 59 72 130.920235(50) 1977 1.50(3) min β+ 131Ce (3/2+)
131mPr 152.4(3) keV 1996 5.73(20) s IT (96.4%) 131Pr (11/2−)
β+ (3.6%) 131Ce
132Pr 59 73 131.919240(31) 1974 1.49(11) min β+ 132Ce (2+)
132m1Pr[n 11] 30(30)# keV (1990)[n 9] 1# s (5+)
132m2Pr 250(30)# keV 2012 2.46(4) μs IT 132Pr (8+)
132m3Pr 300(30)# keV 2012 486(70) ns IT 132Pr (8−)
133Pr 59 74 132.916331(13) 1970 6.5(3) min β+ 133Ce 5/2+
133mPr 192.12(14) keV 2001 1.1(2) μs IT 133Pr (11/2−)
134Pr 59 75 133.915697(22) 1967 17(2) min β+ 134Ce 2−
134mPr 67.7(4) keV 1973 ~11 min β+ 134Ce 6−
135Pr 59 76 134.913112(13) 1954 24(1) min β+ 135Ce 3/2+
135mPr 358.06(6) keV 1973 105(10) μs IT 135Pr (11/2−)
136Pr 59 77 135.912677(12) 1968 13.1(1) min β+ 136Ce 2+
137Pr 59 78 136.9106792(87) 1958 1.28(3) h β+ 137Ce 5/2+
137mPr 561.22(23) keV 1975 2.66(7) μs IT 137Pr 11/2−
138Pr 59 79 137.910757(11) 1951 1.45(5) min β+ 138Ce 1+
138mPr 350(19) keV 1966 2.12(4) h β+ 138Ce 7−
139Pr 59 80 138.9089327(39) 1951 4.41(4) h β+ 139Ce 5/2+
140Pr 59 81 139.9090856(66) 1938 3.39(1) min EC (51.3%) 140Ce 1+
β+ (48.7%)
140m1Pr 127.8(3) keV 1964 0.35(2) μs IT 140Pr 5+
140m2Pr 763.7(5) keV 1964 3.05(20) μs IT 140Pr (7)−
141Pr[n 12] 59 82 140.9076596(16) 1924 Stable 5/2+ 1.0000
142Pr 59 83 141.9100516(16) 1935 19.12(4) h β− (99.98%) 142Nd 2−
EC (0.0164%) 142Ce
142mPr 3.694(3) keV 1967 14.6(5) min IT 142Pr 5−
143Pr[n 12] 59 84 142.9108226(19) 1951 13.57(2) d β− 143Nd 7/2+
144Pr[n 12] 59 85 143.9133107(29) 1946 17.28(5) min β− 144Nd 0−
144mPr[n 12] 59.03(3) keV 1970 7.2(3) min IT (~99.93%) 144Pr 3−
β− (~0.07%) 144Nd
145Pr 59 86 144.9145180(77) 1954 5.984(10) h β− 145Nd 7/2+
146Pr 59 87 145.917688(37) 1953 24.09(10) min β− 146Nd (2−)
147Pr 59 88 146.919007(17) 1964 13.39(4) min β− 147Nd 3/2+
148Pr 59 89 147.922130(16) 1964 2.29(2) min β− 148Nd 1−
148mPr 76.80(20) keV 1979 2.01(7) min β− (64%) 148Nd (4)
IT (36%) 148Pr
149Pr 59 90 148.923736(11) 1964 2.26(7) min β− 149Nd (5/2+)
150Pr 59 91 149.9266764(97) 1970 6.19(16) s β− 150Nd 1−
151Pr 59 92 150.928309(13) 1990 18.90(7) s β− 151Nd (3/2−)
151mPr 35.10(10) keV 2006 50(8) μs IT 151Pr (7/2+)
152Pr 59 93 151.931553(20) 1983 3.57(11) s β− 152Nd 4+
152mPr 115.1(3) keV 1990 4.16(10) μs IT 152Pr (1+)
153Pr 59 94 152.933904(13) 1987 4.28(11) s β− 153Nd 3/2−#
154Pr 59 95 153.93789(11) 1988 2.30(9) s β− 154Nd (3+)
155Pr 59 96 154.940509(18) 2012 1.47(3) s β− 155Nd 3/2−#
156Pr 59 97 155.9447669(11) 2017 444(6) ms β− 156Nd 1+#
157Pr 59 98 156.9480031(34) 2017 307(21) ms β− 157Nd 3/2−#
158Pr 59 99 157.95260(32)# 2017 181(14) ms β− 158Nd 5−#
159Pr 59 100 158.95623(43)# 2017 134(43) ms β− 159Nd 3/2−#
160Pr 59 101 159.96114(43)# 2017 170(140) ms β− 160Nd 1+#
161Pr 59 102 160.96512(54)# 2018 90# ms
[>550 ns]		 3/2−#
This table header & footer:
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  1. [1]
    mPr – 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 italics symbol as daughter – Daughter product is nearly stable.
  7. [7]
    Bold symbol as daughter – Daughter product is stable.
  8. [8]
    ( ) spin value – Indicates spin with weak assignment arguments.
  9. [9]
    Half-life not measured, not included in discovery database
  10. [10]
    Only published in a conference proceeding and not a refereed journal.
  11. [11]
    Order of ground state and isomer is uncertain.
  12. [12]
    Fission product

See also

Daughter products other than praseodymium

References

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