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	[[Category:Isotopes\|Protactinium]]		[[Category:Isotopes\|Protactinium]]

	~~[[ja:プロトアクチニウムの同位体]]~~
	~~[[zh:鏷的同位素]]~~

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'''[[Protactinium]]''' ('''Pa''')
 Standard atomic mass: 231.03588(2) [[unified atomic mass unit|u]]
 The element has no stable isotopes. However, it has a characteristic terrestrial isotopic composition and thus an atomic mass can be given.

Isotopes of protactinium occurring within the radioactive [[disintegration chain]] of [[uranium]] were known as:
* ''uranium X2'' : 234mPa
* ''uranium Z'' : 234Pa

Older names for the element included brevium, eka-tantalum and protoactinium

29 [[radioisotope]]s of protactinium have been characterized, with the most stable being 231-Pa with a [[half life]] of 32760 years, 233-Pa with a half-life of 26.967 days, and 230-Pa with a half-life of 17.4 days. All of the remaining [[radioactive]] isotopes have half-lifes that are less than 1.6 days, and the majority of these have half lifes that are less than 1.8 seconds. This element also has 2 [[meta state]]s, 217m-Pa (t½ 1.15 milliseconds) and 234m-Pa (t½ 1.17 minutes).

The primary [[decay mode]] for isotopes of Pa lighter than (and including) the most stable isotope 231-Pa (ie, 212Pa to 231Pa) is [[alpha decay]] and the primary mode for the heavier isotopes (ie, 232Pa to 240Pa) is [[Beta decay|beta minus (β−) decay]]. The primary [[decay product]]s of isotopes of Pa lighter than (and including) 231-Pa are element Ac ([[actinium]]) isotopes and the primary decay products for the heavier isotopes of Pa are element U ([[uranium]]) isotopes.

== Table ==
{| class="wikitable" style="font-size:95%; white-space:nowrap"
! rowspan="2" | nuclide symbol
! Z([[proton|p]])
! N([[neutron|n]])
!   isotopic mass (u)  
! rowspan="2" | half-life
! rowspan="2" | nuclear spin
! rowspan="2" | representative isotopic composition (mole fraction)
! rowspan="2" | range of natural variation (mole fraction)
|-
! colspan="3" | excitation energy
|-
| 212Pa
| style="text-align:right" | 91
| style="text-align:right" | 121
| 212.02320(8)
| 8(5) ms [5.1(+61-19) ms]
| 7+#
|
|
|-
| 213Pa
| style="text-align:right" | 91
| style="text-align:right" | 122
| 213.02111(8)
| 7(3) ms [5.3(+40-16) ms]
| 9/2-#
|
|
|-
| 214Pa
| style="text-align:right" | 91
| style="text-align:right" | 123
| 214.02092(8)
| 17(3) ms
|
|
|
|-
| 215Pa
| style="text-align:right" | 91
| style="text-align:right" | 124
| 215.01919(9)
| 14(2) ms
| 9/2-#
|
|
|-
| 216Pa
| style="text-align:right" | 91
| style="text-align:right" | 125
| 216.01911(8)
| 105(12) ms
|
|
|
|-
| 217Pa
| style="text-align:right" | 91
| style="text-align:right" | 126
| 217.01832(6)
| 3.48(9) ms
| 9/2-#
|
|
|-
| style="text-indent:1em" | 217mPa
| colspan="3" style="text-indent:2em" | 1860(7) keV
| 1.08(3) ms
| 29/2+#
|
|
|-
| 218Pa
| style="text-align:right" | 91
| style="text-align:right" | 127
| 218.020042(26)
| 0.113(1) ms
|
|
|
|-
| 219Pa
| style="text-align:right" | 91
| style="text-align:right" | 128
| 219.01988(6)
| 53(10) ns
| 9/2-
|
|
|-
| 220Pa
| style="text-align:right" | 91
| style="text-align:right" | 129
| 220.02188(6)
| 780(160) ns
| 1-#
|
|
|-
| 221Pa
| style="text-align:right" | 91
| style="text-align:right" | 130
| 221.02188(6)
| 4.9(8) µs
| 9/2-
|
|
|-
| 222Pa
| style="text-align:right" | 91
| style="text-align:right" | 131
| 222.02374(8)#
| 3.2(3) ms
|
|
|
|-
| 223Pa
| style="text-align:right" | 91
| style="text-align:right" | 132
| 223.02396(8)
| 5.1(6) ms
|
|
|
|-
| 224Pa
| style="text-align:right" | 91
| style="text-align:right" | 133
| 224.025626(17)
| 844(19) ms
| 5-#
|
|
|-
| 225Pa
| style="text-align:right" | 91
| style="text-align:right" | 134
| 225.02613(8)
| 1.7(2) s
| 5/2-#
|
|
|-
| 226Pa
| style="text-align:right" | 91
| style="text-align:right" | 135
| 226.027948(12)
| 1.8(2) min
|
|
|
|-
| 227Pa
| style="text-align:right" | 91
| style="text-align:right" | 136
| 227.028805(8)
| 38.3(3) min
| (5/2-)
|
|
|-
| 228Pa
| style="text-align:right" | 91
| style="text-align:right" | 137
| 228.031051(5)
| 22(1) h
| 3+
|
|
|-
| 229Pa
| style="text-align:right" | 91
| style="text-align:right" | 138
| 229.0320968(30)
| 1.50(5) d
| (5/2+)
|
|
|-
| style="text-indent:1em" | 229mPa
| colspan="3" style="text-indent:2em" | 11.6(3) keV
| 420(30) ns
| 3/2-
|
|
|-
| 230Pa
| style="text-align:right" | 91
| style="text-align:right" | 139
| 230.034541(4)
| 17.4(5) d
| (2-)
|
|
|-
| 231Pa
| style="text-align:right" | 91
| style="text-align:right" | 140
| 231.0358840(24)
| 3.276(11)E+4 a
| 3/2-
| 1.0000
|
|-
| 232Pa
| style="text-align:right" | 91
| style="text-align:right" | 141
| 232.038592(8)
| 1.31(2) d
| (2-)
|
|
|-
| 233Pa
| style="text-align:right" | 91
| style="text-align:right" | 142
| 233.0402473(23)
| 26.975(13) d
| 3/2-
|
|
|-
| 234Pa
| style="text-align:right" | 91
| style="text-align:right" | 143
| 234.043308(5)
| 6.70(5) h
| 4+
|
|
|-
| style="text-indent:1em" | 234mPa
| colspan="3" style="text-indent:2em" | 78(3) keV
| 1.17(3) min
| (0-)
|
|
|-
| 235Pa
| style="text-align:right" | 91
| style="text-align:right" | 144
| 235.04544(5)
| 24.44(11) min
| (3/2-)
|
|
|-
| 236Pa
| style="text-align:right" | 91
| style="text-align:right" | 145
| 236.04868(21)
| 9.1(1) min
| 1(-)
|
|
|-
| 237Pa
| style="text-align:right" | 91
| style="text-align:right" | 146
| 237.05115(11)
| 8.7(2) min
| (1/2+)
|
|
|-
| 238Pa
| style="text-align:right" | 91
| style="text-align:right" | 147
| 238.05450(6)
| 2.27(9) min
| (3-)#
|
|
|-
| 239Pa
| style="text-align:right" | 91
| style="text-align:right" | 148
| 239.05726(21)#
| 1.8(5) h
| (3/2)(-#)
|
|
|-
| 240Pa
| style="text-align:right" | 91
| style="text-align:right" | 149
| 240.06098(32)#
| 2# min
|
|
|
|}

=== 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 [http://www.nndc.bnl.gov/amdc/index.html Ame2003 Atomic Mass Evaluation] by G. Audi, A.H. Wapstra, C. Thibault, J. Blachot and O. Bersillon in ''Nuclear Physics'' A729 (2003).
* Isotopic compositions and standard atomic masses from [http://www.iupac.org/publications/pac/2003/7506/7506x0683.html Atomic weights of the elements. Review 2000 (IUPAC Technical Report)]. ''Pure Appl. Chem.'' Vol. 75, No. 6, pp. 683-800, (2003) and [http://www.iupac.org/news/archives/2005/atomic-weights_revised05.html Atomic Weights Revised (2005)].
* Half-life, spin, and isomer data selected from these sources. Editing notes on this article's talk page.
** Audi, Bersillon, Blachot, Wapstra. [http://amdc.in2p3.fr/web/nubase_en.html The Nubase2003 evaluation of nuclear and decay properties], Nuc. Phys. A 729, pp. 3-128 (2003).
** National Nuclear Data Center, Brookhaven National Laboratory. Information extracted from the [http://www.nndc.bnl.gov/nudat2/ NuDat 2.1 database] (retrieved Sept. 2005).
** David R. Lide (ed.), Norman E. Holden in ''CRC Handbook of Chemistry and Physics, 85th Edition'', online version. CRC Press. Boca Raton, Florida (2005). Section 11, Table of the Isotopes.

{{Isotope nav | element=protactinium | lighter=Isotopes of thorium | heavier=Isotopes of uranium }}

[[Category:Isotopes|Protactinium]]

[[ja:プロトアクチニウムの同位体]]
[[zh:鏷的同位素]]

Isotopes of protactinium - Revision history

wikademia>Wikademia at 00:54, 23 March 2009

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wikademia>Xqbot: robot Adding: ja:プロトアクチニウムの同位体