In reply to Axil Axil's message of Mon, 11 Jun 2012 15:47:44 -0400: Hi, [snip] >Do you think that a double proton reaction is possible as per Kim > > > >http://www.freerepublic.com/focus/f-chat/2746057/posts
Reading this led me to thinking about the ratio of the Cu produced. The ratio of Ni62/Ni64 is 3.39 and that of Cu63/Cu65 is 2.235. However if the neutron richer Ni64 is more prone to react that Ni62, then it seems reasonable to assume that a larger percentage of the Ni64 would react than of the Ni62, which would tend to drive the ratio of Cu isotopes produced back toward the natural ratio. One is even lead to wonder if the natural copper ratio is actually a reflection of the relative Ni62/Ni64-H fusion cross sections? IOW perhaps all (most?) copper was made by fusing H with nickel? Data I have on the primitive mantel abundance of Cu/Ni is about 1%, & given that Ni64 is about 1% of Ni, this hypothesis doesn't seem all that unreasonable). (The notion that most heavy elements are made by neutron addition in supernovas is still just a hypothesis, and one that was invented before CF .) Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/project.html
