Hi Robin, None of those reactions are net exothermic.
You failed to include the energy necessary to overcome the Coulomb barrier, which was the gist of the original message. In all cases that high level of threshold energy, which must be expended, is greater than the yield. Tunneling does not change that situation because tunneling itself is conservative. This should be obvious - depending on how a google search is worded you will get about 10 million hits for something like.... "Fusion of elements with mass numbers (the number of protons and neutrons) greater than 26 uses up more energy than is produced by the reaction. Thus, elements heavier than iron cannot be fuel sources in stars." -----Original Message----- From: mix...@bigpond.com In reply to Jones Beene's message of Hi, >Proton capture is net endothermic >with nickel and leads to significant radioactivity. 1H+58Ni => 59Cu + 3.419 MeV 1H+60Ni => 61Cu + 4.801 MeV 1H+61Ni => 62Cu + 5.866 MeV 1H+61Ni => 58Co + 4He + 0.489 MeV 1H+62Ni => 63Cu + 6.122 MeV 1H+62Ni => 59Co + 4He + 0.346 MeV 1H+64Ni => 65Cu + 7.453 MeV 1H+64Ni => 61Co + 4He + 0.663 MeV All these reactions are exothermic. Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/project.html
