Isotopes of praseodymium

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Isotopes of praseodymium  (59Pr)
Main isotopes [1] Decay
abun­dance half-life (t1/2) mode pro­duct
141Pr100% stable
142Pr synth 19.12 h β 142Nd
ε 142Ce
143Prsynth13.57 dβ 143Nd
Standard atomic weight Ar°(Pr)

Naturally occurring praseodymium (59Pr) is composed of one stable isotope, 141Pr. Thirty-eight 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 15 meta states with the most stable being 138mPr (2.12 hours), 142mPr (14.6 minutes) and 134mPr (~11 minutes).

Contents

The known isotopes of praseodymium range from 121Pr to 159Pr. 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


Nuclide
[n 1]
Z N Isotopic mass (Da) [4]
[n 2] [n 3]
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]
121Pr5962120.95539(54)#12(5) ms p 120Ce(3/2)(+#)
124Pr5965123.94294(43)#1.2(2) sβ+124Ce
β+, p (?%)123La
125Pr5966124.93766(32)#3.3(7) sβ+125Ce3/2+#
126Pr5967125.93524(21)#3.12(18) sβ+126Ce(4, 5)
β+, p (?%)125La
127Pr5968126.93071(21)#4.2(3) sβ+127Ce3/2+#
127mPr600(200)# keV2# μs(11/2−)
128Pr5969127.928791(32)2.85(9) sβ+128Ce(3+)
β+, p (?%)127La
129Pr5970128.925095(32)30(4) sβ+129Ce(3/2+)
129mPr382.57(24) keV26(11)# μs IT 129Pr(11/2−)
130Pr5971129.923590(69)40.0(4) sβ+130Ce(6, 7)(+#)
130mPr100(100)# keV10# s2+#
131Pr5972130.920235(50)1.50(3) minβ+131Ce(3/2+)
131mPr152.4(3) keV5.73(20) s IT (96.4%)131Pr(11/2−)
β+ (3.6%)131Ce
132Pr5973131.919240(31)1.49(11) minβ+132Ce(2+)
132m1Pr [n 9] 30(30)# keV1# s(5+)
132m2Pr250(30)# keV2.46(4) μsIT132Pr(8+)
132m3Pr300(30)# keV486(70) nsIT132Pr(8−)
133Pr5974132.916331(13)6.5(3) minβ+133Ce5/2+
133mPr192.12(14) keV1.1(2) μsIT133Pr(11/2−)
134Pr5975133.915697(22)17(2) minβ+134Ce2−
134mPr67.7(4) keV~11 minβ+134Ce6−
135Pr5976134.913112(13)24(1) minβ+135Ce3/2+
135mPr358.06(6) keV105(10) μsIT135Pr(11/2−)
136Pr5977135.912677(12)13.1(1) minβ+136Ce2+
137Pr5978136.9106792(87)1.28(3) hβ+137Ce5/2+
137mPr561.22(23) keV2.66(7) μsIT137Pr11/2−
138Pr5979137.910757(11)1.45(5) minβ+138Ce1+
138mPr350(19) keV2.12(4) hβ+138Ce7−
139Pr5980138.9089327(39)4.41(4) hβ+139Ce5/2+
140Pr5981139.9090856(66)3.39(1) min EC (51.3%)140Ce1+
β+ (48.7%)
140m1Pr127.8(3) keV0.35(2) μsIT140Pr5+
140m2Pr763.7(5) keV3.05(20) μsIT140Pr(7)−
141Pr [n 10] 5982140.9076596(16)Stable5/2+1.0000
142Pr5983141.9100516(16)19.12(4) hβ (99.98%)142Nd2−
EC (0.0164%)142Ce
142mPr3.694(3) keV14.6(5) minIT142Pr5−
143Pr [n 10] 5984142.9108226(19)13.57(2) dβ143Nd7/2+
144Pr [n 10] 5985143.9133107(29)17.28(5) minβ144Nd0−
144mPr [n 10] 59.03(3) keV7.2(3) minIT (~99.93%)144Pr3−
β (~0.07%)144Nd
145Pr5986144.9145180(77)5.984(10) hβ145Nd7/2+
146Pr5987145.917688(37)24.09(10) minβ146Nd(2−)
147Pr5988146.919007(17)13.39(4) minβ147Nd3/2+
148Pr5989147.922130(16)2.29(2) minβ148Nd1−
148mPr76.80(20) keV2.01(7) minβ (64%)148Nd(4)
IT (36%)148Pr
149Pr5990148.923736(11)2.26(7) minβ149Nd(5/2+)
150Pr5991149.9266764(97)6.19(16) sβ150Nd1−
151Pr5992150.928309(13)18.90(7) sβ151Nd(3/2−)
151mPr35.10(10) keV50(8) μsIT151Pr(7/2+)
152Pr5993151.931553(20)3.57(11) sβ152Nd4+
152mPr115.1(3) keV4.16(10) μsIT152Pr(1+)
153Pr5994152.933904(13)4.28(11) sβ153Nd3/2−#
154Pr5995153.93789(11)2.30(9) sβ154Nd(3+)
155Pr5996154.940509(18)1.47(3) sβ155Nd3/2−#
156Pr5997155.9447669(11)444(6) msβ156Nd1+#
157Pr5998156.9480031(34)307(21) msβ157Nd3/2−#
158Pr5999157.95260(32)#181(14) msβ158Nd5−#
159Pr59100158.95623(43)#134(43) msβ159Nd3/2−#
160Pr59101159.96114(43)#170(140) msβ160Nd1+#
161Pr59102160.96512(54)#90# ms
[>550 ns]
3/2−#
This table header & footer:
  1. mPr  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. 1 2 3 #  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 italics symbol as daughter  Daughter product is nearly stable.
  7. Bold symbol as daughter  Daughter product is stable.
  8. () spin value  Indicates spin with weak assignment arguments.
  9. Order of ground state and isomer is uncertain.
  10. 1 2 3 4 Fission product

See also

Daughter products other than praseodymium

References

  1. 1 2 3 4 Kondev, F. G.; Wang, M.; Huang, W. J.; Naimi, S.; Audi, G. (2021). "The NUBASE2020 evaluation of nuclear properties" (PDF). Chinese Physics C. 45 (3): 030001. doi:10.1088/1674-1137/abddae.
  2. "Standard Atomic Weights: Praseodymium". CIAAW. 2017.
  3. Prohaska, Thomas; Irrgeher, Johanna; Benefield, Jacqueline; Böhlke, John K.; Chesson, Lesley A.; Coplen, Tyler B.; Ding, Tiping; Dunn, Philip J. H.; Gröning, Manfred; Holden, Norman E.; Meijer, Harro A. J. (2022-05-04). "Standard atomic weights of the elements 2021 (IUPAC Technical Report)". Pure and Applied Chemistry. doi:10.1515/pac-2019-0603. ISSN   1365-3075.
  4. Wang, Meng; Huang, W.J.; Kondev, F.G.; Audi, G.; Naimi, S. (2021). "The AME 2020 atomic mass evaluation (II). Tables, graphs and references*". Chinese Physics C. 45 (3): 030003. doi:10.1088/1674-1137/abddaf.