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Independent verification of the production of element 114 in the reaction of 244-MeV 48Ca with 242Pu is presented. Two chains of time- and position-correlated decays have been assigned to 286114 and 287114. The observed decay modes, half-lives, and decay energies agree with published results. The measured cross sections at a center-of-target energy of 244 MeV for the 242Pu(48Ca,3–4n)287,286114 reactions were 1.4(+3.2, -1.2) pb each, which are lower than the reported values.Independent Verification of Element 114 Production in the Ca-48 + Pu-242 Reaction, , Physical Review Letters, Volume 103, Number 13, p.132502, (2009)
It is claimed that recent experimental results involving the bomabardment of americium-243 with calcium-48 ions are consistent with the formation in the laboratory of a few atoms of elements 113 and 115. In experiments conducted at the JINR U400 cyclotron with the Dubna gas-filled separator between July 14 and Aug. 10, 2003, atomic decay patterns were observed that are said to confirm the existence of element 115 and element 113. In these decay chains, element 113 is produced via the alpha decay of element 115.1
The news has been picked up in a number of online sources including Nature2 and elsewhere.
- 1. Experiments on the synthesis of element 115 in the reaction 243Am(48Ca,xn)291−x115,
, Physical Review C, 2/2004, Volume 69, Issue 2, (2004)
- 2. Modern alchemists make two new elements,
, Nature, 2/2004, (2004)
The Mendeleev Periodic Table
This table shows the form of Mendeleev's Periodic Table of the chemical elements as published in 1872. The heading "Reihen" means "Row" and the heading "Gruppe" means "Group". The symbols R2O and RH4, etc., are written in the style of the time which uses superscripts to denote the number of atoms in molecules rather than the current style which uses subscripts. The gaps marked with hyphens ("-") represent chemical elements deduced by Mendeleev as existing but unknown in 1872. He was able to predict with considerable success the properties of some of the missing chemical elements such as germanium.
|8||Cs=133||Ba=137||?Di=138||?Ce=140||-||-||-||- - - -|
|12||-||-||-||Th=231||-||U=240||-||- - - -|