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Nuclear Theory·nucl-th

Wednesday·February 3, 2016

10 papers—5 primary·5 cross-listed

All10Primary5Cross-lists5
  1. 01

    Neutrino Interactions with Nucleons and Nuclei: Importance for Long-Baseline Experiments

    Ulrich Mosel🇩🇪

    This article reviews our present knowledge of neutrino interactions with nucleons and discusses the interactions with nuclei, the target material of all presently running and planned long-baseline experiments. I emphasize descriptions of semi-inclusive reactions and full descriptions of the final state; the latter are needed to reconstruct the incoming neutrino energy from final-state observations. I then discuss Monte Carlo generator and more advanced transport theoretical approaches in connection with experimental results on various reaction mechanisms. Finally, I describe the effects of uncertainties in the reconstruction of the incoming neutrino energy on oscillation parameters. The review argues that the precision era of neutrino physics also needs precision-era generators.

    nucl-thhep-exhep-phnucl-exAnn.Rev.Nucl.Part.Sci.(2016)·128 citations
  3. 03

    Nonclassical Particle Transport in 1-D Random Periodic Media

    Richard Vasques · Kai Krycki · Rachel N. Slaybaugh

    We investigate the accuracy of the recently proposed nonclassical transport equation. This equation contains an extra independent variable compared to the classical transport equation (the path-length ), and models particle transport taking place in homogenized random media in which a particle's distance-to-collision is not exponentially distributed. To solve the nonclassical equation one needs to know the -dependent ensemble-averaged total cross section, , or its corresponding path-length distribution function, . We consider a 1-D spatially periodic system consisting of alternating solid and void layers, randomly placed in the -axis. We obtain an analytical expression for and use this result to compute the corresponding . Then, we proceed to numerically solve the nonclassical equation for different test problems in rod geometry; that is, particles can move only in the directions . To assess the accuracy of these solutions, we produce "benchmark" results obtained by (i) generating a large number of physical realizations of the system, (ii) numerically solving the transport equation in each realization, and (iii) ensemble-averaging the solutions over all physical realizations. We show that the numerical results validate the nonclassical model; the solutions obtained with the nonclassical equation accurately estimate the ensemble-averaged scalar flux in this 1-D random periodic system, greatly outperforming the widely-used atomic mix model in most problems.

    nucl-thNucl.Sci.Eng.(2017)·3 citations
  4. 04

    Bimodality emerges from transport model calculations of heavy ion collisions at intermediate energy

    S. Mallik · S. Das Gupta · G. Chaudhuri

    This work is a continuation of our effort [Phys. Rev. C 91, 034616 (2015)] to examine if signatures of a phase transition can be extracted from transport model calculations of heavy ion collisions at intermediate energy. A signature of first order phase transition is the appearance of a bimodal distribution in in finite systems. Here P_m(k) is the probability that the maximum of the multiplicity distribution occurs at mass number k. Using a well-known model for event generation (BUU plus fluctuation), we do two cases of central collision: mass 40 on mass 40 and mass 120 on mass 120. Bimodality is seen in both the cases. The results are quite similar to those obtained in statistical model calculations. An intriguing feature is seen. We observe that at the energy where bimodality occurs. other phase transition like signatures appear. There are breaks in certain first order derivatives. We then examine if such breaks appear in standard Botzmann-Uehling-Uhlenbeck (BUU) calculations without fluctuations. They do. The implication is interesting. If first order phase transition occurs, it may be possible to recognise that from ordinary BUU calculation. Probably the reason this was not seen already is because this aspect was not investigated before.

    nucl-thnucl-exPRC(2016)·11 citations
  5. 05

    The phonon-coupling model for Skyrme forces

    N. Lyutorovich · V. Tselyaev · J. Speth · S. Krewald · P.-G. Reinhard

    A short review on the self-consistent RPA based on a energy-density functional of the Skyrme type is given. We also present an extension of the RPA where the coupling of phonons to the single-particle states is considered. Within this approach we present numerical results which are compared with data. The self-consistent approach is compared with the Landau-Migdal theory. Here we derive from the self-consistent interaction, the Landau-Migdal parameters as well as their density dependence. In the Appendix a new derivation of the reduced matrix elements of the interaction is presented.

    nucl-thPhys.Atom.Nucl.(2016)·16 citations

Affiliations

first authorsco-authorsvia INSPIRE