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### Topic: Element 115 revisited  (Read 5255 times)

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#### gippgig

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##### Element 115 revisited
« on: February 21, 2012, 09:13:10 PM »
A new study of 115 has been done (open access; PRL 108 022502; DOI: 10.1103/PhysRevLett.108.022502). Besides detecting 21 more atoms of 288115 (but no 287115) 1 atom of 289115 was apparently made by the 243Am(48Ca,2n) reaction. Its decay is consistent with the previous data from the 293117 decay chains.

#### gippgig

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##### Re: Element 115 revisited
« Reply #1 on: February 10, 2013, 04:01:03 AM »
Another follow-up report has been published: DOI: 10.1103/PhysRevC.87.014302. The missing nuclide 271Bh was observed in the decay of 287115.

#### gippgig

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##### Re: Element 115 revisited
« Reply #2 on: August 29, 2013, 02:47:14 AM »
www.newscientist.com/article/dn24119-fresh-evidence-emerges-for-superheavy-element-115.html#.Uh7mjnEpB3s (currently free with registration). The X-ray data should be conclusive.

#### Dan1195

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##### Re: Element 115 revisited
« Reply #3 on: August 30, 2013, 06:47:52 PM »
Finally there is confirmation of the element 115 chains from another facility. There are now 53 decay chains from288115 detected. Read the Preprint paper from Lund.

First interesting thing was the 2 alpha-EC chains and 5 alpha-alpha-EC chains. These chains were not included in the paper so it is unclear how many of the latter chains could potentially belong to 289115. The other possibility is EC decay from 284113 and 280Rg. These would be the best 2 candidates for this in the decay chain as 276Mt has a shorter lifetime and 272Bh is too close to the beta-stability line. Of course we have no data on EC decay for any element about Bh so we only have systematics to estimate the likely EC lifetimes of these nuclei. The 290115 decay chain is much more likely to have EC as a decay mode but we only have 6 decay chains here (and there chains are harder to produce do to needing 249Bk to produce these chains.

Second it appears chain #4 may show the 276Mt isomeric state previously detected in the Dubna experiments due to its long lifetime (~15 half-lives).
« Last Edit: August 30, 2013, 07:14:07 PM by Dan1195 »

#### gippgig

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##### Re: Element 115 revisited
« Reply #4 on: September 01, 2013, 04:41:01 AM »