In reply to Eric Walker's message of Tue, 13 Oct 2015 01:31:18 -0500: Hi, Generally speaking the fission barrier gets lower as the element gets heavier, which is why 235U can be split with a single neutron.
>I wrote: > >If he knew our trick, one of these naturally occurring isotopes might >> have done the trick: >> > >Since tungsten is in the list, and in our day to day experience it does not >decay under alpha decay when we excited it with electrons, I'm guessing the >Q value has to be above a certain threshold in order for the effect to be >obvious (if such an effect exists). Here is a shorter version of the >previous list, with tungsten left at the end as an impractical lower bound: > >e- + 234U => e- + 4He + 230Th + 4858 keV >e- + 235U => e- + 4He + 231Th + 4678 keV >e- + 238U => e- + 4He + 234Th + 4270 keV >e- + 232Th => e- + 4He + 228Ra + 4082 keV >e- + 190Pt => e- + 4He + 186Os + 3252 keV >e- + 209Bi => e- + 4He + 205Tl + 3137 keV >e- + 184Os => e- + 4He + 180W + 2957 keV >e- + 186Os => e- + 4He + 182W + 2820 keV >e- + 187Os => e- + 4He + 183W + 2721 keV >e- + 180W => e- + 4He + 176Hf + 2515 keV > >Of these, only 190Pt was in the earlier list of impurities found in >palladium. > >Eric Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/project.html
