Talk:Isotopes of neptunium/Archive 1

Archive 1

Data 2003

This article is part of Wikipedia:Wikiproject Isotopes. Please keep style and phrasings consistent across the set of pages. For later reference and improved reliability, data from all considered multiple sources is collected here. References are denoted by these letters:

• (A) G. Audi, O. Bersillon, J. Blachot, A.H. Wapstra. The Nubase2003 evaluation of nuclear and decay properties, Nuc. Phys. A 729, pp. 3-128 (2003). — Where this source indicates a speculative value, the # mark is also applied to values with weak assignment arguments from other sources, if grouped together. An asterisk after the A means that a comment of some importance may be available in the original.
• (B) National Nuclear Data Center, Brookhaven National Laboratory, information extracted from the NuDat 2.1 database. (Retrieved Sept. 2005, from the code of the popup boxes).
• (C) 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. — The CRC uses rounded numbers with implied uncertainties, where this concurs with the range of another source it is treated as exactly equal in this comparison.
• (D) More specific level data from reference B's Levels and Gammas database.
• (E) Same as B but excitation energy replaced with that from D.

  Z   N refs symbol   half-life                   spin              excitation energy
 93 132 A   |Np-225  |3# ms [>2 µs]              |9/2-#
 93 132 B   |Np-225  |>2 µs                      |(9/2-)
 93 132 C   |Np-225  |>2 µs                      |
 93 133 AB  |Np-226  |35(10) ms                  |
 93 133 C   |Np-226  |0.03 s                     |
 93 134 A   |Np-227  |510(60) ms                 |5/2-#
 93 134 B   |Np-227  |0.51(6) s                  |
 93 134 C   |Np-227  |0.51 s                     |
 93 135 ABC |Np-228  |61.4(14) s                 |
 93 136 A   |Np-229  |4.0(2) min                 |5/2+#
 93 136 BC  |Np-229  |4.0(4) min                 |
 93 137 ABC |Np-230  |4.6(3) min                 |
 93 138 A   |Np-231  |48.8(2) min                |(5/2)(+#)
 93 138 B   |Np-231  |48.8(2) min                |(5/2)
 93 138 C   |Np-231  |48.8 min                   |5/2
 93 139 AB  |Np-232  |14.7(3) min                |(4+)
 93 139 C   |Np-232  |14.7 min                   |(4-)
 93 140 ABC |Np-233  |36.2(1) min                |(5/2+)
 93 141 ABC |Np-234  |4.4(1) d                   |(0+)
 93 142 ABC |Np-235  |396.1(12) d                |5/2+
 93 143 AB  |Np-236  |154(6)E+3 a                |(6-)
 93 143 C   |Np-236  |1.55E+5 a                  |(6-)
 93 143 AE  |Np-236m |22.5(4) h                  |1                |60(50) keV
 93 143 C   |Np-236m |22.5 h                     |(1-)
 93 144 AB  |Np-237  |2.144(7)E+6 a              |5/2+
 93 144 C   |Np-237  |2.14E+6 a                  |5/2+
 93 145 ABC |Np-238  |2.117(2) d                 |2+
 93 145 A   |Np-238m |112(39) ns                 |                 |2300(200)# keV
 93 145 D   |Np-238m |112(39) ns                 |                 |2300 keV
 93 146 AB  |Np-239  |2.356(3) d                 |5/2+
 93 146 C   |Np-239  |2.355 d                    |5/2+
 93 147 AB  |Np-240  |61.9(2) min                |(5+)
 93 147 C   |Np-240  |1.032 h                    |5+
 93 147 A   |Np-240m |7.22(2) min                |1(+)             |20(15) keV
 93 147 E   |Np-240m |7.22(2) min                |(1+)             |0+X keV
 93 147 C   |Np-240m |7.22 min                   |(1+)
 93 148 AB  |Np-241  |13.9(2) min                |(5/2+)
 93 148 C   |Np-241  |13.9 min                   |5/2+
 93 149 AB  |Np-242  |2.2(2) min                 |(1+)
 93 149 C   |Np-242  |5.5 min                    |6+
 93 149 A   |Np-242m |5.5(1) min                 |6+#              |0(50)# keV
 93 149 B   |Np-242m |5.5(1) min                 |(6+)             |0+Y keV
 93 149 C   |Np-242m |2.2 min                    |(1+)
 93 150 AB  |Np-243  |1.85(15) min               |(5/2-)
 93 150 C   |Np-243  |1.9 min                    |
 93 151 AB  |Np-244  |2.29(16) min               |(7-)
 93 151 C   |Np-244  |2.3 min                    |

Femto 11:18, 17 November 2005 (UTC)

Neptunium-245

But what about the brand-new ²⁴⁵Np isotope? It says nothing about ²⁴⁵Np on the table? A user who knows that the isotope exists should post information on it in the form of an additional row at the bottom of the table. You see, I know it exists. --3.14159265358pi (talk) 17:27, 3 December 2011 (UTC)

It is not known to exist. It is a speculation. Double sharp (talk) 08:11, 17 October 2013 (UTC)