In reply to Axil Axil's message of Sun, 15 Dec 2013 17:37:20 -0500: Hi, [snip]
Photofission only happens in very heavy nuclei, and requires very energetic photons (order 10 MeV) IOW gamma rays. These are clearly not present in CF. Furthermore, the fission reaction needs to be exothermic, which is only true of elements (usually much) heavier that Fe/Ni. The only other known way of obtaining the amount of trigger energy required is by adding at least one nucleon to the nucleus, as is done in conventional fission. This usually adds something like 5-10 MeV per added nucleon. >When a nuclear reaction occurs in only even-even nuclei, the nuclear >reaction is a result of photo fission. > >Remember, Rossi states at his reaction is centered on the Ni62 and Ni64 >nickel isotopes. > >DGT states that all even isotopes of nickel react but Ni61 does not. This >is a possible indication that a low spin nuclear reaction based on photo >fission is occurring. > >https://user.physics.unc.edu/research/nuclear/photonuclear_phys/photofission.php > > > >The absorption of a photon by a heavy, even-even causes an excitation to >an unstable, low-spin state. The states will subsequently undergo a nuclear >reaction or decay to reach a more stable configuration. One likely reaction >available to heavy nuclei is fission, the splitting of the original nucleus >into two distinct nuclei, also known as fragments. Fission occurs when the >nuclear shape deforms to the point when the Coulomb repulsion overcomes the >nuclear surface tension; the nucleus is then unbound and splits into two >nuclei, referred to as fragments. Regards, Robin van Spaandonk http://rvanspaa.freehostia.com/project.html
