Isotopes of praseodymium
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Naturally occurring
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
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] |
Daughter isotope [n 6][n 7] |
Natural abundance (mole fraction) | |||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Excitation energy[n 4] | Normal proportion | Range of variation | |||||||||||||||||
121Pr | 59 | 62 | 120.95536(75)# | 600(300) ms | p | 120Ce | (3/2−) | ||||||||||||
β+ (rare) | 121Ce | ||||||||||||||||||
β+, p (rare) | 120La | ||||||||||||||||||
122Pr | 59 | 63 | 121.95181(54)# | 500# ms | β+ | 122Ce | |||||||||||||
123Pr | 59 | 64 | 122.94596(64)# | 800# ms | β+ | 123Ce | 3/2+# | ||||||||||||
124Pr | 59 | 65 | 123.94296(64)# | 1.2(2) s | β+ | 124Ce | |||||||||||||
β+, p (rare) | 123La | ||||||||||||||||||
125Pr | 59 | 66 | 124.93783(43)# | 3.3(7) s | β+ | 125Ce | 3/2+# | ||||||||||||
β+, p (rare) | 124La | ||||||||||||||||||
126Pr | 59 | 67 | 125.93531(21)# | 3.12(18) s | β+ | 126Ce | (4, 5, 6) | ||||||||||||
β+, p (rare) | 125La | ||||||||||||||||||
127Pr | 59 | 68 | 126.93083(21)# | 4.2(3) s | β+ | 127Ce | 3/2+# | ||||||||||||
127mPr | 600(200)# keV | 50# ms | 11/2− | ||||||||||||||||
128Pr | 59 | 69 | 127.92879(3) | 2.84(9) s | β+ | 128Ce | (3+) | ||||||||||||
β+, p (rare) | 127La | ||||||||||||||||||
129Pr | 59 | 70 | 128.92510(3) | 32(3) s | β+ | 129Ce | (11/2−) | ||||||||||||
129mPr | 382.7(5) keV | 1# ms | β+ | 129Ce | (11/2−) | ||||||||||||||
130Pr | 59 | 71 | 129.92359(7) | 40.0(4) s | β+ | 130Ce | (6, 7)(+#) | ||||||||||||
130mPr | 100(100)# keV | 10# s | 2+# | ||||||||||||||||
131Pr | 59 | 72 | 130.92026(6) | 1.50(3) min | β+ | 131Ce | (3/2+) | ||||||||||||
131mPr | 152.4(2) keV | 5.7(2) s | IT (96.4%)
|
131Pr | (11/2−) | ||||||||||||||
β+ (3.59%) | 131Ce | ||||||||||||||||||
132Pr | 59 | 73 | 131.91926(6) | 1.49(11) min | β+ | 132Ce | (2+) | ||||||||||||
132mPr | 0(100)# keV | 20# s | β+ | 132Ce | (5+) | ||||||||||||||
133Pr | 59 | 74 | 132.916331(13) | 6.5(3) min | β+ | 133Ce | (3/2+) | ||||||||||||
133mPr | 192.05(14) keV | 1.1(2) μs | (11/2−) | ||||||||||||||||
134Pr | 59 | 75 | 133.91571(4) | 17(2) min | β+ | 134Ce | (5−) | ||||||||||||
134mPr | 0(100)# keV | ~11 min | β+ | 134Ce | 2− | ||||||||||||||
135Pr | 59 | 76 | 134.913112(13) | 24(2) min | β+ | 135Ce | 3/2(+) | ||||||||||||
135mPr | 358.06(6) keV | 105(10) μs | (11/2−) | ||||||||||||||||
136Pr | 59 | 77 | 135.912692(13) | 13.1(1) min | β+ | 136Ce | 2+ | ||||||||||||
137Pr | 59 | 78 | 136.910705(13) | 1.28(3) h | β+ | 137Ce | 5/2+ | ||||||||||||
137mPr | 561.22(23) keV | 2.66(7) μs | 11/2− | ||||||||||||||||
138Pr | 59 | 79 | 137.910755(15) | 1.45(5) min | β+ | 138Ce | 1+ | ||||||||||||
138mPr | 348(23) keV | 2.12(4) h | β+ | 138Ce | 7− | ||||||||||||||
139Pr | 59 | 80 | 138.908938(8) | 4.41(4) h | β+ | 139Ce | 5/2+ | ||||||||||||
140Pr | 59 | 81 | 139.909076(7) | 3.39(1) min | EC (51.3(22)%) | 140Ce | 1+ | ||||||||||||
β+ (48.7(22)%) | |||||||||||||||||||
140m1Pr | 127.5(3) keV | 0.35(2) μs | 5+ | ||||||||||||||||
140m2Pr | 763.3(7) keV | 3.05(20) μs | (8)− | ||||||||||||||||
141Pr[n 9] | 59 | 82 | 140.9076528(26) | Stable | 5/2+ | 1.0000 | |||||||||||||
142Pr | 59 | 83 | 141.9100448(26) | 19.12(4) h | β− (99.98%) | 142Nd | 2− | ||||||||||||
EC (.0164%) | 142Ce | ||||||||||||||||||
142mPr | 3.694(3) keV | 14.6(5) min | IT | 142Pr | 5− | ||||||||||||||
143Pr[n 9] | 59 | 84 | 142.9108169(28) | 13.57(2) d | β− | 143Nd | 7/2+ | ||||||||||||
144Pr | 59 | 85 | 143.913305(4) | 17.28(5) min | β− | 144Nd | 0− | ||||||||||||
144mPr | 59.03(3) keV | 7.2(3) min | IT (99.93%) | 144Pr | 3− | ||||||||||||||
β− (.07%) | 144Nd | ||||||||||||||||||
145Pr | 59 | 86 | 144.914512(8) | 5.984(10) h | β− | 145Nd | 7/2+ | ||||||||||||
146Pr | 59 | 87 | 145.91764(7) | 24.15(18) min | β− | 146Nd | (2)− | ||||||||||||
147Pr | 59 | 88 | 146.918996(25) | 13.4(4) min | β− | 147Nd | (3/2+) | ||||||||||||
148Pr | 59 | 89 | 147.922135(28) | 2.29(2) min | β− | 148Nd | 1− | ||||||||||||
148mPr | 50(30)# keV | 2.01(7) min | β− | 148Nd | (4) | ||||||||||||||
149Pr | 59 | 90 | 148.92372(9) | 2.26(7) min | β− | 149Nd | (5/2+) | ||||||||||||
150Pr | 59 | 91 | 149.926673(28) | 6.19(16) s | β− | 150Nd | (1)− | ||||||||||||
151Pr | 59 | 92 | 150.928319(25) | 18.90(7) s | β− | 151Nd | (3/2)(−#) | ||||||||||||
152Pr | 59 | 93 | 151.93150(13) | 3.63(12) s | β− | 152Nd | 4+ | ||||||||||||
153Pr | 59 | 94 | 152.93384(11) | 4.28(11) s | β− | 153Nd | 5/2−# | ||||||||||||
154Pr | 59 | 95 | 153.93752(16) | 2.3(1) s | β− | 154Nd | (3+, 2+) | ||||||||||||
155Pr | 59 | 96 | 154.94012(32)# | 1# s [>300 ns] | β− | 155Nd | 5/2−# | ||||||||||||
156Pr | 59 | 97 | 155.94427(43)# | 500# ms [>300 ns] | β− | 156Nd | |||||||||||||
157Pr | 59 | 98 | 156.94743(43)# | 300# ms | β− | 157Nd | 5/2−# | ||||||||||||
158Pr | 59 | 99 | 157.95198(64)# | 200# ms | β− | 158Nd | |||||||||||||
159Pr | 59 | 100 | 158.95550(75)# | 100# ms | β− | 159Nd | 5/2−# | ||||||||||||
This table header & footer: |
- ^ mPr – Excited nuclear isomer.
- ^ ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.
- ^ # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).
- ^ a b c # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).
- ^
Modes of decay:
EC: Electron capture IT: Isomeric transition
p: Proton emission - ^ Bold italics symbol as daughter – Daughter product is nearly stable.
- ^ Bold symbol as daughter – Daughter product is stable.
- ^ ( ) spin value – Indicates spin with weak assignment arguments.
- ^ Fission product
References
- .
- ^ "Standard Atomic Weights: Praseodymium". CIAAW. 2017.
- ISSN 1365-3075.
- Isotope masses from:
- Audi, Georges; Bersillon, Olivier; Blachot, Jean;
- Isotopic compositions and standard atomic masses from:
- .
- Wieser, Michael E. (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". .
- "News & Notices: Standard Atomic Weights Revised". International Union of Pure and Applied Chemistry. 19 October 2005.
- Half-life, spin, and isomer data selected from the following sources.
- Audi, Georges; Bersillon, Olivier; Blachot, Jean;
- National Nuclear Data Center. "NuDat 2.x database". Brookhaven National Laboratory.
- Holden, Norman E. (2004). "11. Table of the Isotopes". In Lide, David R. (ed.). ISBN 978-0-8493-0485-9.