Radiation-induced interface phenomena: Decoration of high-energy density ion tracks

The effect of 20 MeV Cl4 + ions incident on Au-SiO2 and Ag-SiO2 interfaces was investigated using high-resolution transmission electron microscopy. Cross-sectional micrographs expose beam-induced gold interfacial transport and migration into the SiO2. No such migration was observed for silver films. The relevance of this phenomenon to the adhesion improvement found at corresponding irradiation doses is discussed

An application of group theory in confidential network communications : special Issue paper

A new proposal for group key exchange is introduced which proves to be both efficient and secure and compares favorably with state of the art protocols

Predicting total reaction cross sections for nucleon-nucleus scattering

Nucleon total reaction and neutron total cross sections to 300 MeV for 12C and 208Pb, and for 65 MeV spanning the mass range, are predicted using coordinate space optical potentials formed by full folding of effective nucleon-nucleon interactions with realistic nuclear ground state densities. Good to excellent agreement is found with existing data.Comment: 10 pages, 4 figure

Microscopic study of the isoscalar giant resonances in 208Pb induced by inelastic alpha scattering

The energetic beam of (spin and isospin zero) $\alpha$-particles remains a very efficient probe for the nuclear isoscalar giant resonances. In the present work, a microscopic folding model study of the isoscalar giant resonances in $^{208}$Pb induced by inelastic \aPb scattering at $E_{\rm lab}=240$ and 386 MeV has been performed using the (complex) CDM3Y6 interaction and nuclear transition densities given by both the collective model and Random Phase Approximation (RPA) approach. The fractions of energy weighted sum rule around the main peaks of the isoscalar monopole, dipole and quadrupole giant resonances were probed in the Distorted Wave Born Approximation analysis of inelastic \aPb scattering using the double-folded form factors given by different choices of the nuclear transition densities. The energy distribution of the $E0, E1$ and $E2$ strengths given by the multipole decomposition {analyses} of the \aap data under study are compared with those predicted by the RPA calculation.Comment: Accepted for publication in Nuclear Physics

Formula for proton-nucleus reaction cross section at intermediate energies and its application

We construct a formula for proton-nucleus total reaction cross section as a function of the mass and neutron excess of the target nucleus and the proton incident energy. We deduce the dependence of the cross section on the mass number and the proton incident energy from a simple argument involving the proton optical depth within the framework of a black sphere approximation of nuclei, while we describe the neutron excess dependence by introducing the density derivative of the symmetry energy, L, on the basis of a radius formula constructed from macroscopic nuclear models. We find that the cross section formula can reproduce the energy dependence of the cross section measured for stable nuclei without introducing any adjustable energy dependent parameter. We finally discuss whether or not the reaction cross section is affected by an extremely low density tail of the neutron distribution for halo nuclei.Comment: 7 pages, 4 figures, added reference

Exploratory Assembly Process Evaluation through Manufacturing Simulation

The rise of mass customization imposes significant challenges for manufacturing companies regarding management and development of manufacturing systems, where advanced digital technologies such as simulation can serve as central enablers. The assembly process of the truck manufacturer Volvo Trucks in Tuve handles a broad range of customized product variants. This imposes complexity in process redesign and rebalancing, increases reliance on buffers and challenges efficient resource utilization. In this study, Discrete Event Simulation is applied as a data-driven and visual support tool for iterative, Lean oriented redesign and evaluation of a manual assembly process, supporting close collaboration with process and data domain experts of the company. An approach for handling of detailed Predetermined Time System process data and production levelling rules is applied, generating a detailed, stochastic simulation of product based variation, enabling the model user to conduct subsequent experiments covering changes in both demand and levelling restrictions. The developed model is used as a basis for analyzing the effects of implementation of parallelized, stationary assembly and kitting, where the resulting workload and manning requirements, as well as required buffer levels safety margins in a Kanban implementation, are evaluated with regards to product based variation and production pace. The study indicates the usefulness of Discrete Event Simulation in mass customization environments, and underlines challenges of data management and model complexity. The study identifies a number of benefits in the implementation of kitting and parallelization, as well as several drawbacks and potential risks

Elastic and total reaction cross sections of oxygen isotopes in Glauber theory

We systematically calculate the total reaction cross sections of oxygen isotopes, $^{15-24}$O, on a $^{12}$C target at high energies using the Glauber theory. The oxygen isotopes are described with Slater determinants generated from a phenomenological mean-field potential. The agreement between theory and experiment is generally good, but a sharp increase of the reaction cross sections from ^{21}O to ^{23}O remains unresolved. To examine the sensitivity of the diffraction pattern of elastic scattering to the nuclear surface, we study the differential elastic-scattering cross sections of proton-^{20,21,23}O at the incident energy of 300 MeV by calculating the full Glauber amplitude.Comment: 9 pages, 8 figure