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)
  • 140.90766±0.00001
  • 140.91±0.01 (abridged) [2] [3]

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 5.985 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 (t1/2 2.12 hours), 142mPr (t1/2 14.6 minutes) and 134mPr (t1/2 11 minutes).

The isotopes of praseodymium range in atomic weight from 120.955  u (121Pr) to 158.955 u (159Pr). The primary decay mode before the stable isotope, 141Pr, is electron capture and the mode after is beta decay. The primary decay products before 141Pr are element 58 (cerium) isotopes and the primary products after are element 60 (neodymium) isotopes.

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] [n 7] 		Spin and
parity
[n 8] [n 4] 		Natural abundance (mole fraction)
Excitation energy [n 4] Normal proportionRange of variation
121Pr5962120.95536(75)#600(300) ms p 120Ce(3/2−)
β+ (rare)121Ce
β+, p (rare)120La
122Pr5963121.95181(54)#500# msβ+122Ce
123Pr5964122.94596(64)#800# msβ+123Ce3/2+#
124Pr5965123.94296(64)#1.2(2) sβ+124Ce
β+, p (rare)123La
125Pr5966124.93783(43)#3.3(7) sβ+125Ce3/2+#
β+, p (rare)124La
126Pr5967125.93531(21)#3.12(18) sβ+126Ce(4, 5, 6)
β+, p (rare)125La
127Pr5968126.93083(21)#4.2(3) sβ+127Ce3/2+#
127mPr600(200)# keV50# ms11/2−
128Pr5969127.92879(3)2.84(9) sβ+128Ce(3+)
β+, p (rare)127La
129Pr5970128.92510(3)32(3) sβ+129Ce(11/2−)
129mPr382.7(5) keV1# msβ+129Ce(11/2−)
130Pr5971129.92359(7)40.0(4) sβ+130Ce(6, 7)(+#)
130mPr100(100)# keV10# s2+#
131Pr5972130.92026(6)1.50(3) minβ+131Ce(3/2+)
131mPr152.4(2) keV5.7(2) s IT (96.4%)131Pr(11/2−)
β+ (3.59%)131Ce
132Pr5973131.91926(6)1.49(11) minβ+132Ce(2+)
132mPr0(100)# keV20# sβ+132Ce(5+)
133Pr5974132.916331(13)6.5(3) minβ+133Ce(3/2+)
133mPr192.05(14) keV1.1(2) μs(11/2−)
134Pr5975133.91571(4)17(2) minβ+134Ce(5−)
134mPr0(100)# keV~11 minβ+134Ce2−
135Pr5976134.913112(13)24(2) minβ+135Ce3/2(+)
135mPr358.06(6) keV105(10) μs(11/2−)
136Pr5977135.912692(13)13.1(1) minβ+136Ce2+
137Pr5978136.910705(13)1.28(3) hβ+137Ce5/2+
137mPr561.22(23) keV2.66(7) μs11/2−
138Pr5979137.910755(15)1.45(5) minβ+138Ce1+
138mPr348(23) keV2.12(4) hβ+138Ce7−
139Pr5980138.908938(8)4.41(4) hβ+139Ce5/2+
140Pr5981139.909076(7)3.39(1) min EC (51.3(22)%)140Ce1+
β+ (48.7(22)%)
140m1Pr127.5(3) keV0.35(2) μs5+
140m2Pr763.3(7) keV3.05(20) μs(8)−
141Pr [n 9] 5982140.9076528(26)Stable5/2+1.0000
142Pr5983141.9100448(26)19.12(4) hβ− (99.98%)142Nd2−
EC (.0164%)142Ce
142mPr3.694(3) keV14.6(5) minIT142Pr5−
143Pr [n 9] 5984142.9108169(28)13.57(2) dβ−143Nd7/2+
144Pr5985143.913305(4)17.28(5) minβ−144Nd0−
144mPr59.03(3) keV7.2(3) minIT (99.93%)144Pr3−
β− (.07%)144Nd
145Pr5986144.914512(8)5.984(10) hβ−145Nd7/2+
146Pr5987145.91764(7)24.15(18) minβ−146Nd(2)−
147Pr5988146.918996(25)13.4(4) minβ−147Nd(3/2+)
148Pr5989147.922135(28)2.29(2) minβ−148Nd1−
148mPr50(30)# keV2.01(7) minβ−148Nd(4)
149Pr5990148.92372(9)2.26(7) minβ−149Nd(5/2+)
150Pr5991149.926673(28)6.19(16) sβ−150Nd(1)−
151Pr5992150.928319(25)18.90(7) sβ−151Nd(3/2)(−#)
152Pr5993151.93150(13)3.63(12) sβ−152Nd4+
153Pr5994152.93384(11)4.28(11) sβ−153Nd5/2−#
154Pr5995153.93752(16)2.3(1) sβ−154Nd(3+, 2+)
155Pr5996154.94012(32)#1# s [>300 ns]β−155Nd5/2−#
156Pr5997155.94427(43)#500# ms [>300 ns]β−156Nd
157Pr5998156.94743(43)#300# msβ−157Nd5/2−#
158Pr5999157.95198(64)#200# msβ−158Nd
159Pr59100158.95550(75)#100# msβ−159Nd5/2−#
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. 1 2 Fission product

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References

  1. ↑ 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; et al. (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.
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