Nickel + proton -> copper is an endothermic reaction. Iron is the most stable nuclear species -- that's when big stars die. PhysOrg should know better. (- sebastienbailard's wife)It's been a long time since I was familiar with physics, so please forgive me if I'm saying something incredibly stupid here, but:
Nickel 62 : 61.9283451 u Proton : 1.00727646677 u ------------------------------------ Sum : 62.9356216 u Copper 63 : 62.9295975 u ------------------------------------ Difference: 0.0060241 uThose mass numbers are from Wikipedia, and both Ni62 and Cu63 are, according to Wikipedia, stable. Wouldn't such a reaction be exothermic, since it results in less mass than it started with?
Basically if it comes before iron (in the periodic table) fusion releases energy and fission consumes it, after iron it's the other way around, roughly anyway.I'm aware that this is the claim being made. Can you please explain it, in the face of the seemingly contradictory fact that the mass of Ni62 plus the mass of a proton is greater than the mass of Cu63?
As far as I can tell, this is yet another cold fusion hoax. These "researchers" claim a slew of reactions, all apparently exothermic: 58Ni+1H→59Cu, which decays to 59Ni, then 59Ni+1H→60Cu, and so on, eventually stopping at 62Cu. However, this appearance of a sequence of endothermic reactions is just that, an appearance. The simple mass number math ignores spin and parity. As is, each of these transitions is not allowed. At each stage, the nickel isotope will need to be excited to some other higher energy spin/parity before a transition can occur, and this excitation saps all of the apparent energy gain (and then some). Once spin and parity are taken into account each of the transitions in the chain from 58Ni to 62Cu is in fact endothermic.I'm assuming there's a typo in there? That it should be "all apparently exothermic:... ...However, this appearance of a sequence of
The simple mass number calculations that make each reaction in the chain appear to be exothermic is analogous to computing the energy output from burning dry paper. All it takes is a little energy from a match to set the paper ablaze.
A better analogy would be using a match to light soaking wet paper. They are ignoring that the paper first has to be dried (requiring a huge energy input) before it will start to burn. Ignoring the energy input from drying the paper makes it appear that the energy output is positive. It isn't.
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posted by jcreigh at 1:46 PM on January 30, 2011 [14 favorites]