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Topic: Hs-271  (Read 11973 times)

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Offline gippgig

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« on: April 22, 2008, 02:43:19 AM »
A recent paper (Physical Review Letters 100 132503) reports the characterization of 271Hs produced by the 248Cm(26Mg,3n) reaction (some of this data was previously available on the internet). 271Hs alpha (9.13 MeV; some other energies were also seen) decays to 267Sg, another new isotope. The half-life wasn't measured but is probably several seconds. 267Sg has a half-life of around 80 s and surprisingly (considering its proximity to the deformed shell closures at Z=108 N=172 & odd neutron) decays mainly by SF. Only 1 of 6 atoms decayed by alpha (8.2 MeV; previously published as a tentative identification) emission. The biggest surprise is that the cross section for the 26Mg,3n reaction was about the same as the 4n reaction. This suggests that similar reactions can be used to make less neutron deficient (=longer lived) isotopes of other transactinides.

Offline Dan1195

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Re: Hs-271
« Reply #1 on: April 22, 2008, 08:18:29 AM »
The relatively low SF 267Sg partial half-life is suprising. The scant information on SF for adjacent nuclides near N=162, 267Db (end product of 287115 chain) and 267Rf (end product of 291116) show longer SF half-lives, ~1 h.
We can rule out EC to 267Db as the source, of couse an isomer is always possible.

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