[gippgig]

GSI has confirmed the production of ²⁸³112 at Dubna by the ²³⁸U(⁴⁸Ca,3n)²⁸³112 reaction (www.gsi.de/documents/DOC-2007-Mar-174-1.pdf). 4 atoms were detected, 2 decaying by SF & the other 2 by alpha emission in full agreement with the newer data from Dubna. This is important because it is the first time the production of a superheavy element using ⁴⁸Ca has been reported at another lab and opens the way to recognition of the discovery and naming of the element (Correction: of elements 114 & 116 which decay to 112 - the discovery of 112 (a different isotope by GSI) has already been confirmed).
GSI is now trying to make element 120 by the ²³⁸U(⁶⁴Ni,xn) reaction.

[Dan1195]

Couple of things I picked up looking at the data:

1. Both SF & alpha radioactivity were observed from this nuclide during the same experiment for the first time. This is in contrast to the first Dubna experiments which either had all SF decay with lifetime of ~3 minutes (these are still unexplained, but is it assumed now that this was not the ground state of 112-283) or all alpha decay with a lifetime of a few seconds.

2. The lifetimes of the SF decays are consistant with those of the alphas, suggesting a small SF branch of the nuclide when taken in conjuction with all later Dubna data (ignoring the initial SF reports as those lifetimes are not compatible with the later data). the resulting SF half life of ~60 seconds appears to be compatible with other SF data in the region.