Isotopes of praseodymium
List of isotopes
Abbreviations: EC: Electron capture IT: Isomeric transition Bold for stable isotopes, bold italics for nearly-stable isotopes (half-life longer than the age of the universe) Fission product

Isotopes of praseodymium

Section Title: List of isotopes
Table Section Text: Abbreviations: EC: Electron capture IT: Isomeric transition Bold for stable isotopes, bold italics for nearly-stable isotopes (half-life longer than the age of the universe) Fission product

nuclide symbol	Z(p)	N(n)	isotopic mass (u)	half-life	decay mode(s)	daughter isotope(s)	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	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	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−#

Sentence(s)

In the Isotopes of praseodymium, ¹⁴³Pr has a half-life of 13.57 d and ¹⁴²Pr has a half-life of 19.12 h.

final_sentence: In the Isotopes of praseodymium, ¹⁴³Pr has a half-life of 13.57 d and ¹⁴²Pr has a half-life of 19.12 h.