Talk:Isotopes of curium/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
 96 136 B   |Cm-232  |1? min                     |0+
 96 137 A   |Cm-233  |1# min                     |3/2+#
 96 138 A   |Cm-234  |51(12) s                   |0+
 96 138 B   |Cm-234  |~2 min                     |0+
 96 138 C   |Cm-234  |~51. s                     |
 96 139 A   |Cm-235  |5# min                     |5/2+#
 96 139 B   |Cm-235  |5# min                     |
 96 140 A   |Cm-236  |10# min                    |0+
 96 140 B   |Cm-236  |~10 min                    |0+
 96 141 A   |Cm-237  |20# min                    |5/2+#
 96 141 B   |Cm-237  |~20 min                    |
 96 142 ABC |Cm-238  |2.4(1) h                   |0+
 96 143 AB  |Cm-239  |~2.9 h                     |(7/2-)
 96 143 C   |Cm-239  |~3. h                      |
 96 144 ABC |Cm-240  |27(1) d                    |0+
 96 145 ABC |Cm-241  |32.8(2) d                  |1/2+
 96 146 ABC |Cm-242  |162.8(2) d                 |0+
 96 147 ABC |Cm-243  |29.1(1) a                  |5/2+
 96 147 D   |Cm-243m |1.08(3) µs                 |1/2+             |87.4(1) keV
 96 148 A   |Cm-244  |18.10(2) a                 |0+
 96 148 BC  |Cm-244  |18.1(1) a                  |0+
 96 148 AD  |Cm-244m |34(2) ms                   |6+               |1040.188(12) keV
 96 148 D   |Cm-244m |>500 ns                    |                 |0+X keV
 96 149 A   |Cm-245  |8.5(1)E+3 a                |7/2+
 96 149 B   |Cm-245  |8500(100) a                |7/2+
 96 149 C   |Cm-245  |8.48E+3 a                  |7/2+
 96 149 AD  |Cm-245m |290(20) ns                 |1/2+             |355.90(10) keV
 96 150 A   |Cm-246  |4.76(4)E+3 a               |0+
 96 150 B   |Cm-246  |4760(40) a                 |0+
 96 150 C   |Cm-246  |4.76E+3 a                  |0+
 96 151 ABC |Cm-247  |1.56(5)E+7 a               |9/2-
 96 152 AB  |Cm-248  |3.48(6)E+5 a               |0+
 96 152 C   |Cm-248  |3.48E+5 a                  |0+
 96 153 AB  |Cm-249  |64.15(3) min               |1/2(+)
 96 153 C   |Cm-249  |64.15 min                  |1/2+
 96 153 AD  |Cm-249m |23 µs                      |(7/2+)           |48.758(17) keV
 96 154 A   |Cm-250  |8300# a                    |0+
 96 154 B   |Cm-250  |~8.3E+3 a                  |0+
 96 154 C   |Cm-250  |~9.7E+3 a                  |0+
 96 155 ABC |Cm-251  |16.8(2) min                |(1/2+)
 96 156 A   |Cm-252  |<1 d                       |0+
 96 156 B   |Cm-252  |<2 d                       |0+
 96 156 C   |Cm-252  |<2 d                       |

Femto 11:27, 17 November 2005 (UTC)

Talk

The first three even elements of the actinide series, namely 90 Th, 92U. and 94Pu, are all noted to have the longest half life isotopes being of the more stable EE category. However, starting with EO96Cm247 (55 extra neutrons) the longest half life isotopes are noted to change to the EO category of isotope. It it still reported, however, that the EE isotopes of 96 Curium are still "neutron absorbers" of thermal neutrons which are unable to cause them to become unstable enough to fission. However, both EE96Cm248 and EE96Cm250 are shown as being capable of being fissioned by fast neutrons. And accordingly, the capability of being fast neutron fissioned may be regarded as being a form of structural stability of these fissionable isotopes against the possibility of the lesser energetic modes of decay.WFPM (talk) 01:22, 25 November 2008 (UTC)