Shell structure and few-nucleon removal in intranuclear cascade

It is well known that intranuclear-cascade models generally overestimate the cross sections for one-proton removal from heavy, stable nuclei by a high-energy proton beam, but they yield reasonable predictions for one-neutron removal from the same nuclei and for one-nucleon removal from light targets. We use simple shell-model calculations to investigate the reasons of this deficiency. We find that a correct description of the neutron skin and of the energy density in the nuclear surface is crucial for the aforementioned observables. Neither ingredient is sufficient if taken separately.Comment: Presented at the 11th International Spring Seminar on Nuclear Physics. To be published in Journal of Physics: Conference Serie

Improving proton-induced one-nucleon removal in intranuclear cascade

It is a well-established fact that intranuclear-cascade models generally fail to consistently reproduce the cross sections for one-proton and one-neutron removal from stable nuclei by a high-energy proton beam. We use simple shell-model calculations to investigate the reasons of this deficiency. We find that a refined description of the neutron skin and of the energy density in the nuclear surface is crucial for the aforementioned observables, and that neither ingredient is sufficient if taken separately. As a by-product, the predictions for removal of several nucleons are also improved by the refined treatment.Comment: 15 pages, 11 figures. Submitted to Phys. Rev.

Extension of the Li\`ege Intranuclear-Cascade model to reactions induced by light nuclei

The purpose of this paper is twofold. First, we present the extension of the Li\`ege Intranuclear Cascade model to reactions induced by light ions. Second, we describe the C++ version of the code, which it is physics-wise equivalent to the legacy version, is available in Geant4 and will serve as the basis for all future development of the model. We describe the ideas upon which we built our treatment of nucleus-nucleus reactions and we compare the model predictions against a vast set of heterogeneous experimental data. In spite of the discussed limitations of the intranuclear-cascade scheme, we find that our model yields valid predictions for a number of observables and positions itself as one of the most attractive alternatives available to Geant4 users for the simulation of light-ion-induced reactions.Comment: Submitted to Phys. Rev.

RELATÓRIO SOBRE A REFORMA DO ENSINO SECUNDÁRIO DE MATEMA TICA, REDIGIDA A PEDIDO DA ACADEMIA DE CIENCIAS

Documento com seis páginas, impressos em papel sulfite. O original pertence à professora Lydia Condé Lamparelli, fotografia autorizada pela mesma.Neste texto, com data de 1972, o autor comenta a Reforma ocorrida na França que trata sobre o ensino secundário. Trata sobre algumas tendências de ensino: opção pragmática, opção algébrica e opção conjuntista