Isotopes of praseodymium

Isotopes of praseodymium (₅₉Pr)
ε	142Ce
Standard atomic weight Ar°(Pr)
	140.90766±0.00001[2]; 140.91±0.01 (abridged)[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 (t_1/2 2.12 hours), ^142mPr (t_1/2 14.6 minutes) and ^134mPr (t_1/2 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)
Nuclide [n 1]	Excitation energy[n 4]			Half-life [n 4]	Decay mode [n 5]	Daughter isotope [n 6][n 7]	Spin and parity [n 8][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
¹²⁴Pr	59	65	123.94296(64)#	1.2(2) s	β⁺, p (rare)	¹²³La
¹²⁵Pr	59	66	124.93783(43)#	3.3(7) s	β⁺	¹²⁵Ce	3/2+#
¹²⁵Pr	59	66	124.93783(43)#	3.3(7) s	β⁺, p (rare)	¹²⁴La	3/2+#
¹²⁶Pr	59	67	125.93531(21)#	3.12(18) s	β⁺	¹²⁶Ce	(4, 5, 6)
¹²⁶Pr	59	67	125.93531(21)#	3.12(18) s	β⁺, p (rare)	¹²⁵La	(4, 5, 6)
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+)
¹²⁸Pr	59	69	127.92879(3)	2.84(9) s	β⁺, p (rare)	¹²⁷La	(3+)
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−)
^131mPr	152.4(2) keV			5.7(2) s	β⁺ (3.59%)	¹³¹Ce	(11/2−)
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+
¹⁴⁰Pr	59	81	139.909076(7)	3.39(1) min	β⁺ (48.7(22)%)	¹⁴⁰Ce	1+
^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−
¹⁴²Pr	59	83	141.9100448(26)	19.12(4) h	EC (.0164%)	¹⁴²Ce	2−
^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−
^144mPr	59.03(3) keV			7.2(3) min	β⁻ (.07%)	¹⁴⁴Nd	3−
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).
# – 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

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.
"Standard Atomic Weights: Praseodymium". CIAAW. 2017.
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.

Isotope masses from:
- Audi, Georges; Bersillon, Olivier; Blachot, Jean; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
Isotopic compositions and standard atomic masses from:
- de Laeter, John Robert; Böhlke, John Karl; De Bièvre, Paul; Hidaka, Hiroshi; Peiser, H. Steffen; Rosman, Kevin J. R.; Taylor, Philip D. P. (2003). "Atomic weights of the elements. Review 2000 (IUPAC Technical Report)". Pure and Applied Chemistry. 75 (6): 683–800. doi:10.1351/pac200375060683.
- Wieser, Michael E. (2006). "Atomic weights of the elements 2005 (IUPAC Technical Report)". Pure and Applied Chemistry. 78 (11): 2051–2066. doi:10.1351/pac200678112051.

"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; Wapstra, Aaldert Hendrik (2003), "The NUBASE evaluation of nuclear and decay properties", Nuclear Physics A, 729: 3–128, Bibcode:2003NuPhA.729....3A, doi:10.1016/j.nuclphysa.2003.11.001
- 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.). CRC Handbook of Chemistry and Physics (85th ed.). Boca Raton, Florida: CRC Press. ISBN 978-0-8493-0485-9.

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[4] Pr – Excited nuclear isomer.

[5] ( ) – Uncertainty (1σ) is given in concise form in parentheses after the corresponding last digits.

[TMS-6] # – Atomic mass marked #: value and uncertainty derived not from purely experimental data, but at least partly from trends from the Mass Surface (TMS).

[TNN-7] # – Values marked # are not purely derived from experimental data, but at least partly from trends of neighboring nuclides (TNN).

[8] Modes of decay:

EC: Electron capture

IT: Isomeric transition

p: Proton emission

[9] Bold italics symbol as daughter – Daughter product is nearly stable.

[10] Bold symbol as daughter – Daughter product is stable.

[11] ( ) spin value – Indicates spin with weak assignment arguments.

[FP-12] Fission product

[NUBASE2020-1] 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.

[CIAAW2021-3] 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.

EC:	Electron capture
IT:	Isomeric transition
p:	Proton emission