Dave-- Ni-64 + neutron = Ni-65 which is radioactive with a 2 hour half life and producing a 1.4 and a 1.1 mev gamma. Ni-62 + neutron = Ni-63 which is radioactive with t 100 half life. It decays to a stable Cu-63 with no gamma. The Ni-63 poses a radioactive hazard because of its long life and its Beta decay mode. It would need to be handled as a hazardous waste. However Ni-64 constitutes only about 1% of natural Ni and may not pose an activation hazard given its low concentration.
Bob From: Bob Cook Sent: Thursday, October 15, 2015 8:55 PM To: [email protected] Subject: [Vo]:Re: Swedish scientists claim LENR explanation break-through Dave-- I too think that Al-27 + Thermal-N might be a problem. It gives Al-28 which decays in minutes with a 1.7 mev gamma. That should be observed, if it is above the cosmic background level. However, no gammas there were reported above background. There was a report that the Ni coated the Alumina in the reactor. This may have provided a shield to provide a low flux of thermal neutrons to the Al nuclei to keep the activation low. I think a simple calculation could provide an answer to this question. It would involve a 3-d neutron diffusion model with the appropriate densities and cross sections for the various nuclei present, and the neutron source term from the spallation mechanism. (That is given in the paper integrated over the Lugano test period. The question of what thickness is necessary for Ni to keep neutrons away from the Al can probably be done by hand. The O isotopes should provide no problem since the two above O-16 are stable. The same idea applies to C-12 and C-13 both of which have a very low cross section for thermal neutrons. Fast neutrons would be another problem and would take more material to thermalize them than is present in the small diameter of the reactor tube. They do not predict fast neutrons in the spallation reaction or any of the other nuclear reactions discussed. I believe the authors know what they are about. Bob From: David Roberson Sent: Thursday, October 15, 2015 5:22 PM To: [email protected] Subject: Re: [Vo]:Re: Swedish scientists claim LENR explanation break-through Bob, I understand that the process you are describing is one of them that they assume is occurring. But, you know there must be other elements such as aluminum within range of those low energy neutrons. If even a tiny fraction of the slow neutrons end up being absorbed by one of these undesirables then they would become radioactive. Is my understanding incorrect according to your knowledge of what happens within reactors? I will listen carefully to what you have to say since I realize that you have a great deal of expertise with reactor operation. Is there any chance that most of the gamma rays released by the undesirable neutron activated elements could escape detection? It does not take a great deal of gamma ray energy to penetrate the systems that we are speaking of. What is your opinion? Dave -----Original Message----- From: Bob Cook <[email protected]> To: vortex-l <[email protected]> Sent: Thu, Oct 15, 2015 8:02 pm Subject: [Vo]:Re: Swedish scientists claim LENR explanation break-through Dave-- The Li-7 would pick up a neutron to reach Li-8 which decays to Be-8 by giving up an electron and which in turn decays to 2 alphas with no radiation. (The the loose neutrons are slow and react quickly with the Li and Ni. There is not much else around. A good Be outer shield could reflect any fast neutrons back to the reaction zone. The Li, and H would act as a good moderator to achieve slow neutrons. The Ni and Li-7 get rid of the excess neutrons with a good deal of heat generated. Bob From: David Roberson Sent: Thursday, October 15, 2015 9:16 AM To: [email protected] Subject: Re: [Vo]:Swedish scientists claim LENR explanation break-through The concepts they discuss are interesting, but I find it extremely difficult to believe that neutrons are released freely at low energy. Why would this not lead to dangerous radiation release as some become captured by other active elements that must be present due to contamination of the system? If they can prove that the released neutrons are immediately captured during a portion of that same process by nickel or some other active receptor then at least the dangerous radiation problem might be mitigated. Otherwise, free neutrons should be off the table in my humble opinion. Dave -----Original Message----- From: Bob Cook <[email protected]> To: vortex-l <[email protected]> Sent: Thu, Oct 15, 2015 11:14 am Subject: Re: [Vo]:Swedish scientists claim LENR explanation break-through It looks to me like Mats scooped all the other news outlets. Good work Mats. The paper is quite good and understandable. Neutron spallation and slow neutron transmutation stimulated by a an electric field gradient (maybe across a surface) at a certain resonance. Lots of parameters that can be engineered. Seems to fit Rossi’s conditions well. Bob Cook From: Mats Lewan Sent: Thursday, October 15, 2015 2:50 AM To: mailto:[email protected] Subject: [Vo]:Swedish scientists claim LENR explanation break-through Essentially no new physics but a little-known physical effect describing matter’s interaction with electromagnetic fields — ponderomotive Miller forces — would explain energy release and isotopic changes in LENR. This is what Rickard Lundin and Hans Lidgren, two top level Swedish scientists, claim, describing their theory in a paper called Nuclear Spallation and Neutron Capture Induced by Ponderomotive Wave Forcing (full length paper here) that will be presented on Friday, October 16, at the 11th International Workshop on Anomalies in Hydrogen Loaded Metals, hosted by Airbus in Toulouse, France. Read more here: http://animpossibleinvention.com/2015/10/15/swedish-scientists-claim-lenr-explanation-break-through/ Mats www.animpossibleinvention.com
