Las estrategias de caza durante el Paleolitico Superior cantábrico. El caso del oriente asturiano

Sin resume

Collisions of Nucleons with Atoms: Calculated Cross Sections and Monte Carlo Simulation

After a summary description of the theory of elastic collisions of nucleons with atoms, we present the calculation of a generic database of differential and integrated cross sections for the simulation of multiple elastic collisions of protons and neutrons with kinetic energies larger than 100 keV. The relativistic plane-wave Born approximation, with binding and Coulomb-deflection corrections, has been used to calculate a database of proton-impact ionization of K-shell and L-, M-, and N-subshells of neutral atoms These databases cover the whole energy range of interest for all the elements in the periodic system, from hydrogen to einsteinium (Z = 1–99); they are provided as part of the penh distribution package. The Monte Carlo code system penh for the simulation of coupled electron-photon-proton transport is extended to account for the effect of the transport of neutrons (released in proton-induced nuclear reactions) in calculations of dose distributions from proton beams. A simplified description of neutron transport, in which neutron-induced nuclear reactions are described as a fractionally absorbing process, is shown to give simulated depth-dose distributions in good agreement with those generated by the Geant4 code. The proton-impact ionization database, combined with the description of atomic relaxation data and electron transport in penelope, allows the simulation of proton-induced x-ray emission spectra from targets with complex geometries.Ministerio de Ciencia, Innovación y Universidades RTI2018-098117-B-C21, RTI2018-098117-BC2

Collisions of nucleons with atoms: calculated cross sections and Monte Carlo simulation

After a summary description of the theory of elastic collisions of nucleons with atoms, we present the calculation of a generic database of differential and integrated cross sections for the simulation of multiple elastic collisions of protons and neutrons with kinetic energies larger than 100 keV. The relativistic plane-wave Born approximation, with binding and Coulomb-deflection corrections, has been used to calculate a database of proton-impact ionization of K-shell and L-, M-, and N-subshells of neutral atoms These databases cover the whole energy range of interest for all the elements in the periodic system, from hydrogen to einsteinium (Z = 1-99); they are provided as part of the penh distribution package. The Monte Carlo code system penh for the simulation of coupled electron-photon-proton transport is extended to account for the effect of the transport of neutrons (released in proton-induced nuclear reactions) in calculations of dose distributions from proton beams. A simplified description of neutron transport, in which neutron-induced nuclear reactions are described as a fractionally absorbing process, is shown to give simulated depth-dose distributions in good agreement with those generated by the Geant4 code. The proton-impact ionization database, combined with the description of atomic relaxation data and electron transport in penelope, allows the simulation of proton-induced x-ray emission spectra from targets with complex geometries

GEANT4 application for the simulation of the head of a siemens primus linac

The Monte Carlo simulation of the head of a Siemens Primus Linac used at Virgen Macarena Hospital (Sevilla, Spain) has been performed using the code GEANT4 [1-2], version 9.2. In this work, the main features of the application built by our group are presented. They are mainly focused in the optimization of the performance of the simulation. The geometry, including the water phantom, has been entirely wrapped by a shielding volume which discards all the particles escaping far away through its walls. With this, a factor of four in the time spent by the simulation can be saved. An interface to read and write phase-space files in IAEA format has been also developed to save CPU time in our simulations [3-4]. Finally, some calculations of the dose absorption in the water phantom have been done and compared with the results given by EGSnrc [5] and with experimental data obtained for the calibration of the machine

A general numerical solution of dispersion relations for the nuclear optical model

A general numerical solution of the dispersion integral relation between the real and the imaginary parts of the nuclear optical potential is presented. Fast convergence is achieved by means of the Gauss-Legendre integration method, which offers accuracy, easiness of implementation and generality for dispersive optical model calculations. The use of this numerical integration method in the optical-model parameter search codes allows for a fast and accurate dispersive analysis

Variación de la capacidad portante de suelos granulares contaminados con hidrocarburos

El trabajo presenta una investigación sobre la variación de las propiedades geotécnicas básicas de una Arena de Miga (de Madrid) contaminada con hidrocarburos ligeros. Se deducen las siguientes conclusiones: (1) comportamiento particular frente a la compactación; (2) Disminución de la resistencia cortante drenada y (3) Variación de la capacidad portante de los suelos contaminados

La caza en el Solutrense cantábrico: una nueva perspectiva

[ES] Este estudio ofrece una revisión crítica de los datos faunísticos solutrenses disponibles hasta este momento para la cornisa cantábrica. Se han valorado dos criterios fundamentales: la contextualización paleoclimática de las muestras faunísticas recientes y la valoración crítica de las muestras faunísticas conservadas desde las antiguas excavaciones. A partir ele estos criterios es posible actualizar con cierta aproximación la dinámica evolutiva de los modelos estratégicos utilizados por los antiguos cazadores solutrenses en el transcurso de los 3.500 años. Esta dinámica contempla constantes modificaciones en las estrategias de caza según variaban las condiciones ambientales, aunque sin existir una vinculación estricta entre los cambios climáticos y faunísticos. En grandes líneas se detectan dos períodos bien distintos. Durante el Laugerie e ínter Laugerie/Lascaux se prefirió una diversificación de los objetivos de caza. Cuando menos desde la segunda mitad del último episodio se decidió establecer los primeros regímenes especializados basados en la caza selectiva de ciervos. Esta nueva dinámica ofrece múltiples posibilidades interpretativas más allá de las anacrónicas versiones establecidas por los estudios arqueozoológicos tradicionales y aporta una nueva perspectiva en la historiografía tradicional sobre la economías paleolíticas cantábricas.[EN] This paper contributes a critical review of the solutrean faunistic record available until this moment for the Cantabrian region. This review was made following two fundamental approaches: the palaeoclimatic contextualization of the newest faunistic samples and the critical valuation of the faunistic samples conserved from the ancient field works. Starting from these approaches it's possible to renoval the view about the evolutionary dynamic of the strategic models used by the old hunters in the course of the 3.500 years of the solutrean occupations with certain approach. This dynamic contemplates constant modifications in the strategies of hunt as the environmental conditions changed, although there is no strict linking between the climatic and faunistic changes. In general, we detected two very different periods. During the Laugerie and Inter Laugerie/ Lascaux was preferred a diversification of the hunted objectives. At least since the second half of the last episode was decided to establish the first specialization in base to the selective deer hunt. This new dynamic offers multiple interpretative possibilities beyond the anachronic versions established by the traditional archaeozoological studies and it gives a new perspective in the traditional historiography on the Cantabrian paleolithic economies

A phenomenological imaginary part of the optical potential for heavy ions

The depth of the imaginary part of the optical potential is derived from the assumption that, at a given energy and for each partial wave L, it is proportional to the compound nucleus density level up to a given excitation energy above the yrast level corresponding to the angular momentum L, and remains a constant for smaller values of L. The prescription is successfully tested for the system 16O + 28Si at nine different projectile energies between 33 and 81 MeV; it fails however at 141.5 MeV, as expected, because other channels, besides elastic scattering and fusion, are important