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Belyaeva T.L.,National Autonomous University of Mexico | Danilov A.N.,RAS Research Center Kurchatov Institute | Demyanova A.S.,RAS Research Center Kurchatov Institute | Goncharov S.A.,Skobeltsyn Institute of Nuclear Physics | And 2 more authors.
Physical Review C - Nuclear Physics

Evidence of the 3α-particle condensate character of the Hoyle state (the 02+ state at 7.65 MeV in C12) implies not only an enhanced radius of C12 in this state, which was established by many theoretical calculations and confirmed by the recent diffraction model analysis, but also zero relative angular momenta between clusters. We performed coupled-channels model calculations of the angular distributions of α+12C elastic and inelastic (to the 4.44-MeV 2⊃+, 7.65-MeV 02+, and 9.65-MeV 31- states) scattering at 110 MeV and found the ratio of the empirical spectroscopic factors S(L). As the differential cross sections of these reactions are characterized by pronounced enhancement and strong oscillations at large angles, we assumed a potential scattering in the forward hemisphere and the direct transfer of a Be8 cluster at θc.m. 90⊃° and took into account the direct transfer of Be8 in the ground state and in the first excited 2⊃+ and 4⊃+ states. We found that the cluster configuration with L=0 dominates in the 02+ state, being more than three times larger than that in the ground state. This result provides additional evidence of the condensed structure of the Hoyle state in C12 with a dominance of zero relative angular momentum. The negative-parity 31- excited state in C12 observed above the 3α threshold is also considered to have the 3α-cluster structure. The present calculations described well the structure of the large-angle cross section on this state. We found a positive interference for all allowed α+8Be configurations with a dominance of the p-orbital (69%)α+8Be motion and confirmed the exotic, but hardly a condensed, structure of this state. © 2010 The American Physical Society. Source

Vernov Y.S.,RAS Institute for Nuclear Research | Mnatsakanova M.N.,Skobeltsyn Institute of Nuclear Physics | Salynskii S.G.,RAS Institute for High Energy Physics
Physics of Particles and Nuclei Letters

An analogue of the Weyl representation of the algebra of canonical commutation relations is proved to exist in the anti-Fock case achieved in Krein space. © 2012 Pleiades Publishing, Ltd. Source

Alekseenko V.,RAS Institute for Nuclear Research | Arneodo F.,National Institute of Nuclear Physics, Italy | Bruno G.,University of LAquila | Fulgione W.,National institute for astrophysics | And 5 more authors.
Journal of Physics: Conference Series

Forbush decrease was recorded for the first time with a global net of the neutron scintillation detectors (en-detectors) developed in INR RAS. The detectors are located at four geographic points: Baksan (43E, 43N), Gran Sasso, Italy (13E, 42N), Moscow (37E, 56N) and Obninsk (38E, 55N). This experimental fact by itself shows not only the possibility of using the detectors for cosmic ray variations study but also unbiasly supports the nuclear physics method developed by us as a novel instrument both for geophysical researches and for neutron environment monitoring. Source

Leonov S.B.,Russian Academy of Sciences | Firsov A.A.,Russian Academy of Sciences | Shurupov M.A.,Russian Academy of Sciences | Michael J.B.,Princeton University | And 3 more authors.
Physics of Plasmas

The use of a low energy, high peak intensity (>100TW/cm2) femtosecond laser pulse is investigated for guiding and control of a sub-microsecond high voltage discharge. Study of the laser induced plasma channel and measurements of the field required for breakdown in air and nitrogen at atmospheric pressure are presented. Direct imaging of the dynamics of the discharge breakdown shows effective laser guiding. The effectiveness of laser guiding is shown to be critically dependent on the laser focusing geometry, timing, and location relative to the electrodes. © 2012 American Institute of Physics. Source

Burkhanov G.S.,RAS Institute of Metallurgy | Kol'chugina N.B.,RAS Institute of Metallurgy | Lukin A.A.,OAO SPETsMAGNIT | Godovikov S.K.,Skobeltsyn Institute of Nuclear Physics | And 2 more authors.
Bulletin of the Russian Academy of Sciences: Physics

Mössbauer spectroscopy is used to study the structure of sintered (Nd, Pr, Dy, Tb)-Fe-B magnets and the initial alloy obtained via strip-casting and used in the magnets’ preparation. Terbium is made a part of the composition by adding TbH2 hydride, considerably improving the hysteretic characteristics of the magnets. Along with an increase in the local nonuniformity of the iron atoms’ environment, the study reveals the substantial normalization of the population of iron atoms in the Nd2Fe14B crystal lattice as a result of heat treatment and the incorporation of Tb atoms into the crystal lattice. © 2015, Allerton Press, Inc. Source

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