Talk:Isotopes of nobelium/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
102 146 AB  |No-248  |<2 µs                      |0+
102 147 A   |No-249  |57(12) µs                  |5/2+#
102 147 B   |No-249  |54(+15-10) µs              |
102 148 A   |No-250  |5.7(8) µs                  |0+
102 148 B   |No-250  |6(1) µs                    |0+
102 148 C   |No-250  |~0.036 ms                  |0+
102 149 A   |No-251  |760(30) ms                 |7/2+#
102 149 B   |No-251  |0.78(2) s                  |(7/2+)
102 149 C   |No-251  |0.76 s                     |
102 149 A*  |No-251m |1.7(10) s                  |9/2-#            |110(180)# keV
102 149 B   |No-251m |0.93(6) s                  |(1/2+)           |0.0870 MeV
102 149 D   |No-251m |0.8(3) s                   |(7/2+)           |0 keV
102 150 AC  |No-252  |2.44(4) s                  |0+
102 150 B   |No-252  |2.27(14) s                 |0+
102 150 B   |No-252m |26(7) d                    |                 |0 MeV
102 151 AB  |No-253  |1.62(15) min               |(9/2-)#
102 151 C   |No-253  |1.7 min                    |(9/2-)
102 151 A   |No-253m |31 µs                      |5/2+#            |129(19) keV
102 152 AB  |No-254  |51(10) s                   |0+
102 152 C   |No-254  |49. s                      |0+
102 152 A   |No-254m |280(40) ms                 |                 |500(100)# keV
102 152 E   |No-254m |0.28(4) s                  |0+               |0+X keV
102 152 C   |No-254m |0.28 s                     |
102 153 AB  |No-255  |3.1(2) min                 |(1/2+)
102 153 C   |No-255  |3.1 min                    |1/2+
102 154 ABC |No-256  |2.91(5) s                  |0+
102 155 A   |No-257  |25(2) s                    |(7/2+)
102 155 BC  |No-257  |25(3) s                    |(7/2+)
102 156 AB  |No-258  |1.2(2) ms                  |0+
102 156 C   |No-258  |~1.2 ms                    |0+
102 157 AC  |No-259  |58(5) min                  |(9/2+)#
102 157 B   |No-259  |58(5) min                  |
102 158 AB  |No-260  |106(8) ms                  |0+
102 158 C   |No-260  |0.11 s                     |
102 159 A   |No-261  |3# h                       |3/2+#
102 160 AB  |No-262  |~5 ms                      |0+
102 160 C   |No-262  |~8. ms                     |
102 161 AB  |No-263  |20# min                    |
102 162 AB  |No-264  |1# min                     |0+

Femto 11:42, 17 November 2005 (UTC)

comment

Nobelium is an even numbered (even Z) element. At atomic number 102, it is the last of the actinide series of elements and is a cogener of element 70 Ytterbium. It contains two categories of isotopes, namely EE's with even numbers of both protons and neutrons, and EO's with an even number of protons and an odd number of neutrons. It's cogener 70Yb is noted to have 7 stable isotopes. 5 of them are EE's and 2 are EO's, with the EO's occurring in between the center of the group of EE's. This is typical of the stability characteristic of even Z isotopes, since it noted that there are 156 stable EE isotopes and only 56 EO's. And a graph of the Log second half life characteristic of EE elements shows a saw tooth indication resulting from the usual increased half life of EE isotopes versus that of EO isotopes. However in the case of 102 Nobelium the longest half life isotopes are noted to be 102No261 with 159 neutrons (57 extra neutrons) and a reported half life of 3 hours, and 102No259 with 157 neutrons (55 extra neutrons) and a reported half life of 58 minutes. This noted lack of consistency of the reported half life data of the heavy elements casts some doubt upon the accuracy of the reported values. However, since 102 Nobelium is cogener to 70 Ytterbium, with a filled element period, it should be able to be stable or have a long half life with a minimum number of extra neutrons. WFPM (talk) 14:12, 14 November 2008 (UTC)Another comparison that can be made in this matter is to note that the most stable isotope of 94 Plutonium is EE94Pu244 with 56 extra neutrons and a reported half life of 80 million years, whereas EE102No260, with only 8 more deuterons, is reported to have a half life of only 106 milliseconds. The Nubase finally also notes the existence of a metastable isotope of EE102No252 (48 extra neutrons) with a reported half life of 27 days. WFPM (talk) 00:41, 25 November 2008 (UTC) However the 2003 data does not report this type of No252 isotope. WFPM (talk) 03:27, 26 November 2008 (UTC)