| 释义 |
- List of isotopes Notes
- References
{{infobox praseodymium isotopes}}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
symbol | Z(p) | N(n) |
isotopic mass (u)
| half-life | decay
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 |
|---|
| 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 | β+ | 140Ce | 1+ | | 140m1Pr | 127.5(3) keV | 0.35(2) µs | 5+ | | 140m2Pr | 763.3(7) keV | 3.05(20) µs | (8)− | | 141Pr[4] | 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[4] | 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−# |
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, bold italics for nearly-stable isotopes (half-life longer than the age of the universe)
4. ^1 Fission product
Notes - 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:
- 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 : Praseodymium|Isotopes of praseodymium|Lists of isotopes by element |