HomeTable of NuclidesProtactiniumIsotopes

Isotopes of Protactinium

List of known isotopes of the element Protactinium.

Isotope	t½	%	Spin/parity	Radius	Isotopic mass	Discovery
²¹¹Pa	300 ns	syn.	—	—	2.11·10⁸ ±74.58 keV/c²	2006
²¹²Pa	5.1 ± ms	syn.	—	—	2.12·10⁸ ±94.04 keV/c²	1997
²¹³Pa	5.3 ± ms	syn.	9/2-	—	2.13·10⁸ ±61.37 keV/c²	1995
²¹⁴Pa	17 ±3 ms	syn.	—	—	2.14·10⁸ ±87.18 keV/c²	1995
²¹⁵Pa	14 ±2 ms	syn.	(9/2-)	—	2.15·10⁸ ±88.51 keV/c²	1979
²¹⁶Pa	0.15 ± s	syn.	—	—	2.16·10⁸ ±26.45 keV/c²	1972
²¹⁷Pa	3.8 ±2 ms	syn.	(9/2-)	—	2.17·10⁸ ±13.41 keV/c²	1968
²¹⁸Pa	109 ±5 us	syn.	(8-)	—	2.18·10⁸ ±19.15 keV/c²	1979
²¹⁹Pa	54 ±10 ns	syn.	9/2-	—	2.19·10⁸ ±74.83 keV/c²	2005
²²⁰Pa	0.78 ±16 us	syn.	—	—	2.2·10⁸ ±15.73 keV/c²	1987
²²¹Pa	5.9 ±17 us	syn.	9/2-	—	2.21·10⁸ ±63.74 keV/c²	1983
²²²Pa	2.9 ± ms	syn.	—	—	2.22·10⁸ ±92.97 keV/c²	1970
²²³Pa	5.1 ±6 ms	syn.	—	—	2.23·10⁸ ±81.19 keV/c²	1970
²²⁴Pa	0.846 ±20 s	syn.	(5-)	—	2.24·10⁸ ±8.145 keV/c²	1958
²²⁵Pa	1.7 ±2 s	syn.	—	—	2.25·10⁸ ±87.88 keV/c²	1958
²²⁶Pa	1.8 ±2 m	syn.	—	—	2.26·10⁸ ±12.03 keV/c²	1949
²²⁷Pa	38.3 ±3 m	syn.	(5/2-)	—	2.27·10⁸ ±7.797 keV/c²	1948
²²⁸Pa	22 ±1 h	syn.	3+	—	2.28·10⁸ ±4.659 keV/c²	1948
²²⁹Pa	1.5 ±5 d	syn.	(5/2+)	—	2.29·10⁸ ±3.521 keV/c²	1949
²³⁰Pa	17.4 ±5 d	syn.	2-	—	2.3·10⁸ ±3.261 keV/c²	1948
²³¹Pa	32,570 ±130 a	100 %	3/2-	—	2.31·10⁸ ±1.901 keV/c²	1918
²³²Pa	1.32 ±2 d	syn.	(2-)	—	2.32·10⁸ ±8.206 keV/c²	1949
²³³Pa	26.97 ±13 d	syn.	3/2-	—	2.33·10⁸ ±1.433 keV/c²	1938
²³⁴Pa	6.7 ±5 h	syn.	4+	—	2.34·10⁸ ±4.395 keV/c²	1921
²³⁵Pa	24.4 ±2 m	syn.	(3/2-)	—	2.35·10⁸ ±15 keV/c²	1950
²³⁶Pa	9.1 ±1 m	syn.	1(+)	—	2.36·10⁸ ±15 keV/c²	1963
²³⁷Pa	8.7 ±2 m	syn.	(1/2+)	—	2.37·10⁸ ±14 keV/c²	1954
²³⁸Pa	2.28 ±10 m	syn.	(3-)	—	2.38·10⁸ ±17 keV/c²	1968
²³⁹Pa	1.8 ±5 h	syn.	(3/2)	—	2.39·10⁸ ±210 keV/c²	1995

211PaProtactinium-211

Classification	z: 91; n: 120; m: 211
Half life	300 ns
Natural abundance	synthetic nuclide
Decay modes	α decay; electron capture + β⁺ decay; proton emission
Discovery	2006
Mass excess	22,050 ±69.47 keV
Binding energy	7,629 ±0.3293 keV
Single-particle energy	-703.8 ±71.99 keV
Q value for electron capture	8,175 ±110.6 keV

Point at nuclide Decay chain of Protactinium-211

212PaProtactinium-212

Classification	z: 91; n: 121; m: 212
Half life	5.1 ± ms
Natural abundance	synthetic nuclide
Decay modes	α decay
Discovery	1997
Mass excess	21,590 ±87.6 keV
Binding energy	7,633 ±0.4132 keV
Single-particle energy	-431.2 ±122.8 keV
Neutron separation energy	8,527 ±111.8 keV
Q value for electron capture	9,485 ±88.18 keV

Point at nuclide Decay chain of Protactinium-212

213PaProtactinium-213

Classification	z: 91; n: 122; m: 213
Half life	5.3 ± ms
Natural abundance	synthetic nuclide
Spin/parity	9/2-
Decay modes	α decay
Discovery	1995
Mass excess	19,650 ±57.17 keV
Binding energy	7,644 ±0.2684 keV
Single-particle energy	-254.4 ±58.05 keV
Neutron separation energy	10,010 ±104.6 keV
Q value for electron capture	7,534 ±57.9 keV

Point at nuclide Decay chain of Protactinium-213

214PaProtactinium-214

Classification	z: 91; n: 123; m: 214
Half life	17 ±3 ms
Natural abundance	synthetic nuclide
Decay modes	α decay
Discovery	1995
Mass excess	19,450 ±81.2 keV
Binding energy	7,647 ±0.3795 keV
Single-particle energy	-50.82 ±81.72 keV
Neutron separation energy	8,265 ±99.31 keV
Q value for electron capture	8,764 ±81.9 keV

Point at nuclide Decay chain of Protactinium-214

215PaProtactinium-215

Classification	z: 91; n: 124; m: 215
Half life	14 ±2 ms
Natural abundance	synthetic nuclide
Spin/parity	(9/2-)
Decay modes	α decay
Discovery	1979
Mass excess	17,800 ±82.45 keV
Binding energy	7,657 ±0.3835 keV
Single-particle energy	179.3 ±83.13 keV
Neutron separation energy	9,726 ±115.7 keV
Q value for electron capture	6,883 ±82.69 keV
β⁻ decay energy	-7,085 ±132.8 keV

Point at nuclide Decay chain of Protactinium-215

216PaProtactinium-216

Classification	z: 91; n: 125; m: 216
Half life	0.15 ± s
Natural abundance	synthetic nuclide
Decay modes	α decay; electron capture (EC)
Discovery	1972
Mass excess	17,820 ±24.64 keV
Binding energy	7,659 ±0.1141 keV
Single-particle energy	386.6 ±25.44 keV
Neutron separation energy	8,052 ±86.05 keV
Q value for electron capture	7,525 ±27.03 keV
β⁻ decay energy	-5,243 ±37.37 keV
β⁻ decay energy with neutron	-15,140 ±107 keV

Point at nuclide Decay chain of Protactinium-216

217PaProtactinium-217

Classification	z: 91; n: 126; m: 217
Half life	3.8 ±2 ms
Natural abundance	synthetic nuclide
Spin/parity	(9/2-)
Decay modes	α decay
Discovery	1968
Mass excess	17,050 ±12.49 keV
Binding energy	7,664 ±0.0576 keV
Single-particle energy	532.7 ±16.71 keV
Neutron separation energy	8,840 ±27.63 keV
Q value for electron capture	4,848 ±16.39 keV
β⁻ decay energy	-5,916 ±81 keV
β⁻ decay energy with neutron	-14,090 ±30.74 keV

Point at nuclide Decay chain of Protactinium-217

218PaProtactinium-218

Classification	z: 91; n: 127; m: 218
Half life	109 ±5 us
Natural abundance	synthetic nuclide
Spin/parity	(8-)
Decay modes	α decay
Discovery	1979
Mass excess	18,640 ±17.84 keV
Binding energy	7,659 ±0.0819 keV
Single-particle energy	845.1 ±20.76 keV
Neutron separation energy	6,476 ±21.75 keV
Q value for electron capture	6,282 ±20.71 keV
β⁻ decay energy	-3,246 ±22.5 keV
β⁻ decay energy with neutron	-12,400 ±82 keV

Point at nuclide Decay chain of Protactinium-218

219PaProtactinium-219

Classification	z: 91; n: 128; m: 219
Half life	54 ±10 ns
Natural abundance	synthetic nuclide
Spin/parity	9/2-
Decay modes	α decay
Discovery	2005
Mass excess	18,580 ±69.7 keV
Binding energy	7,661 ±0.3183 keV
Single-particle energy	1,072 ±70.49 keV
Neutron separation energy	8,137 ±71.94 keV
Q value for electron capture	4,120 ±89.7 keV
β⁻ decay energy	-4,713 ±70.96 keV
β⁻ decay energy with neutron	-11,390 ±71.04 keV

Point at nuclide Decay chain of Protactinium-219

220PaProtactinium-220

Classification	z: 91; n: 129; m: 220
Half life	0.78 ±16 us
Natural abundance	synthetic nuclide
Decay modes	α decay; electron capture + β⁺ decay
Discovery	1987
Mass excess	20,270 ±14.65 keV
Binding energy	7,655 ±0.0666 keV
Single-particle energy	1,473 ±58.33 keV
Neutron separation energy	6,376 ±71.22 keV
Q value for electron capture	5,588 ±20.05 keV
β⁻ decay energy	-2,735 ±102 keV
β⁻ decay energy with neutron	-11,090 ±19.81 keV

Point at nuclide Decay chain of Protactinium-220

221PaProtactinium-221

Classification	z: 91; n: 130; m: 221
Half life	5.9 ±17 us
Natural abundance	synthetic nuclide
Spin/parity	9/2-
Decay modes	α decay
Discovery	1983
Mass excess	20,370 ±59.38 keV
Binding energy	7,656 ±0.2687 keV
Single-particle energy	1,603 ±60.92 keV
Neutron separation energy	7,974 ±61.16 keV
Q value for electron capture	3,435 ±59.91 keV
β⁻ decay energy	-4,146 ±93.43 keV
β⁻ decay energy with neutron	-10,710 ±117 keV

Point at nuclide Decay chain of Protactinium-221

222PaProtactinium-222

Classification	z: 91; n: 131; m: 222
Half life	2.9 ± ms
Natural abundance	synthetic nuclide
Decay modes	α decay
Discovery	1970
Mass excess	22,060 ±86.6 keV
Binding energy	7,651 ±0.3901 keV
Single-particle energy	2,164 ±86.95 keV
Neutron separation energy	6,381 ±105 keV
Q value for electron capture	4,861 ±87.2 keV
β⁻ decay energy	-2,209 ±101 keV
β⁻ decay energy with neutron	-10,530 ±112.7 keV

Point at nuclide Decay chain of Protactinium-222

223PaProtactinium-223

Classification	z: 91; n: 132; m: 223
Half life	5.1 ±6 ms
Natural abundance	synthetic nuclide
Decay modes	α decay
Discovery	1970
Mass excess	22,330 ±75.63 keV
Binding energy	7,651 ±0.3392 keV
Single-particle energy	2,154 ±76.3 keV
Neutron separation energy	7,798 ±114.9 keV
Q value for electron capture	2,952 ±76.04 keV
β⁻ decay energy	-3,708 ±95.92 keV
β⁻ decay energy with neutron	-10,010 ±91.77 keV

Point at nuclide Decay chain of Protactinium-223

224PaProtactinium-224

Classification	z: 91; n: 133; m: 224
Half life	0.846 ±20 s
Natural abundance	synthetic nuclide
Spin/parity	(5-)
Decay modes	α decay
Discovery	1958
Mass excess	23,860 ±7.587 keV
Binding energy	7,646 ±0.0339 keV
Single-particle energy	2,812 ±10.86 keV
Neutron separation energy	6,546 ±75.98 keV
Q value for electron capture	3,866 ±12.23 keV
β⁻ decay energy	-1,881 ±16.97 keV
β⁻ decay energy with neutron	-10,260 ±59.51 keV

Point at nuclide Decay chain of Protactinium-224

225PaProtactinium-225

Classification	z: 91; n: 134; m: 225
Half life	1.7 ±2 s
Natural abundance	synthetic nuclide
Decay modes	α decay
Discovery	1958
Mass excess	24,350 ±81.86 keV
Binding energy	7,646 ±0.3639 keV
Single-particle energy	2,927 ±82.41 keV
Neutron separation energy	7,577 ±82.19 keV
Q value for electron capture	2,046 ±82.02 keV
β⁻ decay energy	-3,016 ±82.45 keV
β⁻ decay energy with neutron	-9,458 ±83.26 keV

Point at nuclide Decay chain of Protactinium-225

226PaProtactinium-226

Classification	z: 91; n: 135; m: 226
Half life	1.8 ±2 m
Natural abundance	synthetic nuclide
Decay modes	α decay; electron capture + β⁺ decay
Discovery	1949
Mass excess	26,030 ±11.21 keV
Binding energy	7,641 ±0.0496 keV
Single-particle energy	3,565 ±12.17 keV
Neutron separation energy	6,394 ±82.6 keV
Q value for electron capture	2,835 ±12.07 keV
β⁻ decay energy	-1,296 ±15.67 keV
β⁻ decay energy with neutron	-9,410 ±14.89 keV

Point at nuclide Decay chain of Protactinium-226

227PaProtactinium-227

Classification	z: 91; n: 136; m: 227
Half life	38.3 ±3 m
Natural abundance	synthetic nuclide
Spin/parity	(5/2-)
Decay modes	α decay; electron capture (EC)
Discovery	1948
Mass excess	26,830 ±7.263 keV
Binding energy	7,639 ±0.032 keV
Single-particle energy	3,656 ±8.441 keV
Neutron separation energy	7,274 ±13.29 keV
Q value for electron capture	1,025 ±7.557 keV
β⁻ decay energy	-2,215 ±11.11 keV
β⁻ decay energy with neutron	-8,570 ±13.17 keV

Point at nuclide Decay chain of Protactinium-227

228PaProtactinium-228

Classification	z: 91; n: 137; m: 228
Half life	22 ±1 h
Natural abundance	synthetic nuclide
Spin/parity	3+
Decay modes	electron capture + β⁺ decay; α decay
Discovery	1948
Mass excess	28,920 ±4.34 keV
Binding energy	7,632 ±0.019 keV
Single-particle energy	4,170 ±4.673 keV
Neutron separation energy	5,978 ±8.36 keV
Q value for electron capture	2,152 ±4.7 keV
β⁻ decay energy	-296.5 ±14.08 keV
β⁻ decay energy with neutron	-8,193 ±9.449 keV
Magnetic dipole moment	3.5 ±0.5 μN

Point at nuclide Decay chain of Protactinium-228

229PaProtactinium-229

Classification	z: 91; n: 138; m: 229
Half life	1.5 ±5 d
Natural abundance	synthetic nuclide
Spin/parity	(5/2+)
Decay modes	electron capture (EC); α decay
Discovery	1949
Mass excess	29,890 ±3.28 keV
Binding energy	7,629 ±0.0143 keV
Single-particle energy	4,163 ±3.394 keV
Neutron separation energy	7,098 ±5.311 keV
Q value for electron capture	311.3 ±4.067 keV
β⁻ decay energy	-1,314 ±6.655 keV
β⁻ decay energy with neutron	-7,395 ±13.84 keV

Point at nuclide Decay chain of Protactinium-229

230PaProtactinium-230

Classification	z: 91; n: 139; m: 230
Half life	17.4 ±5 d
Natural abundance	synthetic nuclide
Spin/parity	2-
Decay modes	electron capture + β⁺ decay; β⁻ decay; α decay
Discovery	1948
Mass excess	32,170 ±3.038 keV
Binding energy	7,621 ±0.0132 keV
Single-particle energy	4,700 ±3.586 keV
Neutron separation energy	5,794 ±4.22 keV
Q value for electron capture	1,311 ±3.27 keV
β⁻ decay energy	558.5 ±4.591 keV
β⁻ decay energy with neutron	-7,109 ±6.594 keV
Magnetic dipole moment	2 ±0.2 μN

Point at nuclide Decay chain of Protactinium-230

231PaProtactinium-231

Classification	z: 91; n: 140; m: 231
Half life	32,570 ±130 a
Natural abundance	100 %
Spin/parity	3/2-
Decay modes	α decay; spontaneous fission
Discovery	1918
Mass excess	33,420 ±1.771 keV
Binding energy	7,618 ±0.0077 keV
Single-particle energy	4,727 ±1.464 keV
Neutron separation energy	6,820 ±3.181 keV
Q value for electron capture	-391.5 ±2.149 keV
β⁻ decay energy	-381.7 ±2.032 keV
β⁻ decay energy with neutron	-6,262 ±4.711 keV
Magnetic dipole moment	1.99 ±0.02 μN

Point at nuclide Decay chain of Protactinium-231

232PaProtactinium-232

Classification	z: 91; n: 141; m: 232
Half life	1.32 ±2 d
Natural abundance	synthetic nuclide
Spin/parity	(2-)
Decay modes	β⁻ decay; electron capture (EC)
Discovery	1949
Mass excess	35,940 ±7.645 keV
Binding energy	7,609 ±0.033 keV
Single-particle energy	5,158 ±7.519 keV
Neutron separation energy	5,549 ±7.68 keV
Q value for electron capture	499.8 ±7.776 keV
β⁻ decay energy	1,337 ±7.427 keV
β⁻ decay energy with neutron	-5,931 ±7.938 keV

Point at nuclide Decay chain of Protactinium-232

233PaProtactinium-233

Classification	z: 91; n: 142; m: 233
Half life	26.97 ±13 d
Natural abundance	synthetic nuclide
Spin/parity	3/2-
Decay modes	β⁻ decay
Discovery	1938
Mass excess	37,480 ±1.336 keV
Binding energy	7,604 ±0.0057 keV
Single-particle energy	5,246 ±1.119 keV
Neutron separation energy	6,528 ±7.644 keV
Q value for electron capture	-1,243 ±1.953 keV
β⁻ decay energy	570.2 ±1.975 keV
β⁻ decay energy with neutron	-5,192 ±1.806 keV
Magnetic dipole moment	4 ±0.7 μN
Electric quadrupole moment	-3 ±0.4 b

Point at nuclide Decay chain of Protactinium-233

234PaProtactinium-234

Classification	z: 91; n: 143; m: 234
Half life	6.7 ±5 h
Natural abundance	synthetic nuclide
Spin/parity	4+
Decay modes	β⁻ decay
Discovery	1921
Mass excess	40,330 ±4.094 keV
Binding energy	7,594 ±0.0175 keV
Single-particle energy	5,681 ±4.084 keV
Neutron separation energy	5,221 ±4.058 keV
Q value for electron capture	-274.1 ±4.844 keV
β⁻ decay energy	2,193 ±3.999 keV
β⁻ decay energy with neutron	-4,652 ±4.453 keV

Point at nuclide Decay chain of Protactinium-234

235PaProtactinium-235

Classification	z: 91; n: 144; m: 235
Half life	24.4 ±2 m
Natural abundance	synthetic nuclide
Spin/parity	(3/2-)
Decay modes	β⁻ decay
Discovery	1950
Mass excess	42,280 ±13.97 keV
Binding energy	7,588 ±0.0595 keV
Single-particle energy	5,613 ±14.21 keV
Neutron separation energy	6,121 ±14.55 keV
Q value for electron capture	-1,729 ±19.11 keV
β⁻ decay energy	1,370 ±14.01 keV
β⁻ decay energy with neutron	-3,928 ±14.01 keV

Point at nuclide Decay chain of Protactinium-235

236PaProtactinium-236

Classification	z: 91; n: 145; m: 236
Half life	9.1 ±1 m
Natural abundance	synthetic nuclide
Spin/parity	1(+)
Decay modes	β⁻ decay
Discovery	1963
Mass excess	45,330 ±13.97 keV
Binding energy	7,577 ±0.0592 keV
Single-particle energy	5,972 ±19.11 keV
Neutron separation energy	5,026 ±19.76 keV
Q value for electron capture	-921.3 ±19.75 keV
β⁻ decay energy	2,889 ±14.01 keV
β⁻ decay energy with neutron	-3,657 ±14.01 keV

Point at nuclide Decay chain of Protactinium-236

237PaProtactinium-237

Classification	z: 91; n: 146; m: 237
Half life	8.7 ±2 m
Natural abundance	synthetic nuclide
Spin/parity	(1/2+)
Decay modes	β⁻ decay
Discovery	1954
Mass excess	47,520 ±13.04 keV
Binding energy	7,570 ±0.055 keV
Single-particle energy	6,016 ±19.11 keV
Neutron separation energy	5,877 ±19.11 keV
Q value for electron capture	-2,428 ±20.51 keV
β⁻ decay energy	2,137 ±13.09 keV
β⁻ decay energy with neutron	-2,989 ±13.08 keV

Point at nuclide Decay chain of Protactinium-237

238PaProtactinium-238

Classification	z: 91; n: 147; m: 238
Half life	2.28 ±10 m
Natural abundance	synthetic nuclide
Spin/parity	(3-)
Decay modes	β⁻ decay
Discovery	1968
Mass excess	50,890 ±15.83 keV
Binding energy	7,558 ±0.0665 keV
Single-particle energy	6,350 ±22.39 keV
Neutron separation energy	4,704 ±20.51 keV
Q value for electron capture	-1,631 ±283.4 keV
β⁻ decay energy	3,586 ±15.9 keV
β⁻ decay energy with neutron	-2,568 ±15.88 keV

Point at nuclide Decay chain of Protactinium-238

239PaProtactinium-239

Classification	z: 91; n: 148; m: 239
Half life	1.8 ±5 h
Natural abundance	synthetic nuclide
Spin/parity	(3/2)
Decay modes	β⁻ decay
Discovery	1995
Mass excess	53,330 ±196 keV
Binding energy	7,550 ±1 keV
Single-particle energy	6,477 ±344 keV
Neutron separation energy	5,628 ±196 keV
β⁻ decay energy	2,765 ±196 keV
β⁻ decay energy with neutron	-2,042 ±196 keV

Point at nuclide Decay chain of Protactinium-239

Isotopes of Protactinium

211PaProtactinium-211ads_clickcall_splitdownload

212PaProtactinium-212ads_clickcall_splitdownload

213PaProtactinium-213ads_clickcall_splitdownload

214PaProtactinium-214ads_clickcall_splitdownload

215PaProtactinium-215ads_clickcall_splitdownload

216PaProtactinium-216ads_clickcall_splitdownload

217PaProtactinium-217ads_clickcall_splitdownload

218PaProtactinium-218ads_clickcall_splitdownload

219PaProtactinium-219ads_clickcall_splitdownload

220PaProtactinium-220ads_clickcall_splitdownload

221PaProtactinium-221ads_clickcall_splitdownload

222PaProtactinium-222ads_clickcall_splitdownload

223PaProtactinium-223ads_clickcall_splitdownload

224PaProtactinium-224ads_clickcall_splitdownload

225PaProtactinium-225ads_clickcall_splitdownload

226PaProtactinium-226ads_clickcall_splitdownload

227PaProtactinium-227ads_clickcall_splitdownload

228PaProtactinium-228ads_clickcall_splitdownload

229PaProtactinium-229ads_clickcall_splitdownload

230PaProtactinium-230ads_clickcall_splitdownload

231PaProtactinium-231ads_clickcall_splitdownload

232PaProtactinium-232ads_clickcall_splitdownload

233PaProtactinium-233ads_clickcall_splitdownload

234PaProtactinium-234ads_clickcall_splitdownload

235PaProtactinium-235ads_clickcall_splitdownload

236PaProtactinium-236ads_clickcall_splitdownload

237PaProtactinium-237ads_clickcall_splitdownload

238PaProtactinium-238ads_clickcall_splitdownload

239PaProtactinium-239ads_clickcall_splitdownload

211PaProtactinium-211

212PaProtactinium-212

213PaProtactinium-213

214PaProtactinium-214

215PaProtactinium-215

216PaProtactinium-216

217PaProtactinium-217

218PaProtactinium-218

219PaProtactinium-219

220PaProtactinium-220

221PaProtactinium-221

222PaProtactinium-222

223PaProtactinium-223

224PaProtactinium-224

225PaProtactinium-225

226PaProtactinium-226

227PaProtactinium-227

228PaProtactinium-228

229PaProtactinium-229

230PaProtactinium-230

231PaProtactinium-231

232PaProtactinium-232

233PaProtactinium-233

234PaProtactinium-234

235PaProtactinium-235

236PaProtactinium-236

237PaProtactinium-237

238PaProtactinium-238

239PaProtactinium-239