Future publications
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TURE PUBLICATIONS
DOI: 10.1134/S1063778810040186
Special Features of the Filling of the Fermi Sphere with Quark Quasiparticles G. M. Zinovjev, S. V. Molodtsov, and A. N. Sissakian
The filling of the Fermi sphere with quarks treated as quasiparticles of a model Hamiltonian involving fourfermion interaction is studied.
Fragmentation Production of Charmed Hadrons in Electron–Positron Annihilation А. А. Novoselov
D∗
Processes involving the production of mesons and Λc baryons in electron–positron annihilation at the energies of 10.58 and 91.18 GeV are considered. At the energy of 10.58 GeV, the production of pairs of B mesons that is followed by their decay to charmed particles is analyzed along with direct charm production. The violation of scaling in the respective fragmentation functions is taken into account in the next-to-leading order of perturbative QCD. The required nonperturbative fragmentation functions are extracted numerically from experimental data obtained at B factories and are approximated by simple analytic expressions. It is shown that the difference in the nonperturbative fragmentation functions for transitions to mesons and baryons can readily be explained on the basis of the quark-counting rules.
Possibility of Implementing a Nondirect Experiment Aimed at Determining the Cross Section for Nucleon Interaction with an Excited Nucleus A. M. Sukhovoj and V. A. Khitrov
With the aid of experimental data on the level densities in the even–odd tungsten isotopes 183,185,187 W as determined in the respective (n, 2γ) reactions, the ratio of the cross section for the interaction of an excited nucleus with a neutron to its counterpart calculated on the basis of the optical model of the nucleus was obtained from the spectra of evaporated neutrons in the reaction 181 Ta(p, n) 181 W. A significant local increase in this ratio is qualitatively interpreted as that which is due to the possible increase in the penetrability of the nuclear surface for nucleon reaction products because of the effect of phonon-type excitations. Sources of possible nonstandard systematic errors in experimentally determining the level density in an arbitrary nucleus at energies below the nucleon binding energy Bn are analyzed. The extraction of information from the distribution of the intensities of cascades belonging to the nucleon and photon type is simulated. The resulting information may be highly reliable if use is made of the entire body of experimental data on the nucleus under analysis.
On the Spectrum of Channels in the Reaction Involving the Resonance-Neutron-Induced Fission of Aligned Nuclei 235 U D. I. Tambovtsev
Angular distributions of fragments originating from the resonance-neutron-induced fission of oriented nuclei display special features differing sharply from the features of angular distributions of fragments in the fission of the same compound nucleus in reactions on spinless targets. First of all, this is manifested in the suppression of K = 0 states. The effect on these angular distributions that is exerted by the cut
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