Additionally to the "vivo" online discussion, a post-discussion is opened here:

@ Serguei Fomin:

Dear Sultan and Marko,

Thanks a lot Sultan for organizing these seminars and a great opportunity to communicate with colleagues and friends. It was very pleasant and interesting to listen to Marco's presentation on rainbow scattering in crystals and nanotubes, which reminded me of my early works on the physics of the interaction of relativistic electrons and positrons with crystals in 70th years. At that time we did not have computers yet, and at first the calculations were carried out only analytically. Just in case, here are links to our somewhat pioneering work 😄 :
- S.P. Fomin, N.F. Shul’ga, Rainbow scattering and orbiting of fast particles in crystal. Phys. Lett. A73 (1979) 131-133.
- N.F. Shul’ga, V.I. Truten’, Interference effects in string scattering of fast particles in crystal. Phys. Lett. A96 (1983) 107-110.
- N.F. Shul’ga, V.I. Truten’, Orientation effects in interaction of high-energy particles with strings of atoms in a crystal. Sov Phys JETP 60 (1984) 145-152.
When nanotubes appeared, we considered similar effects for them as well (see our review X. Artru et al. ‘Carbon_nanotubes …', Physics Reports 412 (2005) 89-189 (see Figs 17-20). In our papers, we considered the scattering mainly of over-barrier relativistic electrons and positrons.

Marco, you have obtained very interesting results, which may also be of great practical importance. Asking you about the influence of thermal oscillations and the incoherent scattering associated with them, I had in mind the influence of the corresponding fluctuations of the continuous field of SWNT, leading to nonconservation of the energy of the transverse motion of particles, and which can have a destructive effect on interference picture. In a diamond crystal, the amplitude of thermal vibrations is, of course, very small, however, in the case of SWNT, this may not be the case due to the significant anisotropy of thermal vibrations of atoms in transverse direction to the "graphene" wall of the nanotube.

For the last twenty years I have been engaged in the physics of innovative nuclear reactors. But I know that in recent years, Nikolai and Sergey Shul'ga from my institute, NSC KIPT, have been studying quantum effects in the scattering of fast particles in thin and ultrathin crystals... I told him (N. Shul'ga) about your work and gave a link to the presentation and your publications. He said that he knows the earlier work of your colleagues N. Neškovič and B. Petrovič and refers to their work in his monograph on scattering theory.

@ Marko Cosic:

Dear Sultan,

Sorry for the late response. I have received the invitation and the confirmation letter... I was honored to be invited to give a talk and exchange scientific ideas with Sergei Fomin and others. I believe this result should be valued more than simple participation in some ordinary conference.

After the online seminar, I was in Croatia performing experiments on the rainbow channeling of protons in thin silicon Crystals. We have successfully detected the change of the angular distribution from an “x” like shape to a “+” like, followed by observation of the intense maximum at the center at the point of the transition. In other words, we have finally experimentally confirmed the existence of the zero-degree focusing effect that was theocratized to exist many years ago.