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Elastic scattering measurements for the C+Pb system at Elab=66 MeV
No full textBackground: The influence of halo structure of He6, B8, Be11, and Li11 nuclei in several mechanisms such as direct reactions and fusion is already established, although not completely understood. The influence of the C10 Brunnian structure is less known. Purpose: To investigate the influence of the cluster configuration of C10 on the elastic scattering at an energy close to the Coulomb barrier. Methods: We present experimental data for the elastic scattering of the C10+Pb208 system at Elab=66 MeV. The data are compared to the three- and the four-body continuum-discretized coupled-channels calculations assuming B9+p, Be6+α, and Be8+p+p configurations. Results: The experimental angular distribution of the cross sections shows the suppression of the Fresnel peak that is reasonably well reproduced by the continuum-discretized coupled-channels calculations. However, the calculations underestimate the cross sections at backward angles. Couplings to continuum states represent a small effect. Conclusions: The cluster configurations of C10 assumed in the present work are able to describe some of the features of the data. To explain the data at backward angles, experimental data for the breakup and an extension of theoretical formalism towards a four-body cluster seem to be in need to reproduce the measured angular distribution
Rate of decline of the production cross section of superheavy nuclei with =114–117 at high excitation energies
No full textThe production cross sections of superheavy nuclei with charge numbers 114–117 are predicted in the (5–9)n evaporation channels of the Ca48-induced complete fusion reactions for future experiments. The estimates of synthesis capabilities are based on a uniform and consistent set of input nuclear data provided by the multidimensional microscopic-macroscopic approach. The contributions of various factors to the final production cross section are discussed. As shown, the specific interplay between survival and fusion probabilities unexpectedly leads to a relatively slow decline of the total cross sections with increasing excitation energy. This effect is supported by a favorable arrangement of fission barriers protecting the compound nucleus against splitting concerning energetic thresholds for the emission of successive neutrons. In particular, the probabilities of the formation of superheavy nuclei in the 5n, 6n, and in some cases even 7n evaporation channels are still promising. This may offer a new opportunity for the future synthesis of unknown neutron-deficient superheavy isotopes
New approach to supersymmetric Ruijsenaars–Schneider model
No full textWe present a very simple form of the supercharges and the Hamiltonian of supersymmetric extension of -particle Ruijsenaars--Schneider models for three cases of the interaction: , , . The long ``fermionic tails'' of the supercharges and Hamiltonian rolled up in the simple rational functions depending on fermionic bilinears
A Scintillation Hodoscopic Spectrometer
No full textThe calibration results are presented for a scintillation hodoscopic spectrometer of charged particles, which has been designed for an experiment on the search for a heavy electron on the bremsstrahlung photon beam at the Pakhra accelerator of the LPI. The relative energy and coordinate resolutions of the spectrometer at electron energy E = 40 MeV are δ = 22% and σ = 9.5 mm, respectively. It has been determined that the width of electromagnetic showers in the transverse direction can be described by the energy dependences Δ ~ lnE at E 100 MeV
New large-volume detector at the Baksan Neutrino Observatory: Detector prototype
No full textAt the Baksan Neutrino Observatory (Institute for Nuclear Research of the Russian Academy of Sciences, Moscow) deployed in the Caucasus mountains, it is proposed to create, at a depth corresponding to about 4700 mwe (meter water equivalent), a large-volume neutrino detector on the basis of a liquid scintillator with a target mass of 10 kt. This article describes the current state of the first stage of the project, namely a prototype detector with a scintillator mass of 0.5 t. The design of the detector, the equipment and methods used are described
COMPASS PRODUCTION SYSTEM: FRONTERA EXPERIENCE
No full textSince 2019, the COMPASS experiment has been running on the Frontera high-performance computer.This is a large machine (number 5 in the ranking of the most powerful supercomputers in 2019).Details of software setup and approaches to organizing data processing on this machine are presentedin the article
Problem-oriented interface for MICC
No full textThe saas.jinr.ru service is an attempt to simplify the usage of the JINR Multifunctional Information and Computing Complex (MICC). The project mainly focuses on evaluating the potential of problem-oriented web-interfaces and ways to ease the access to all of the major computing facilities of the MICC. The paper covers the project/`/`s current state, including the service architecture and its capabilities overview, and further development plans