How many-body correlations and α\alpha-clustering shape 6^6He

The Borromean $^6$He nucleus is an exotic system characterized by two `halo' neutrons orbiting around a compact $^4$He (or $\alpha$) core, in which the binary subsystems are unbound. The simultaneous reproduction of its small binding energy and extended matter and point-proton radii has been a challenge for {\em ab initio} theoretical calculations based on traditional bound-state methods. Using soft nucleon-nucleon interactions based on chiral effective field theory potentials, we show that supplementing the model space with $^4$He+$n$+$n$ cluster degrees of freedom largely solves this issue. We analyze the role played by the $\alpha$-clustering and many-body correlations, and study the dependence of the energy spectrum on the resolution scale of the interaction.Comment: 5 pages, 4 figure

Advances in the ab initio description of nuclear three-cluster systems

We introduce the extension of the ab initio no-core shell model with continuum to describe three-body cluster systems. We present results for the ground state of 6He and show improvements with respect to the description obtained within the no-core shell model and the no-core shell model/resonating group methods.Comment: Proceedings of the 21st International Conference on Few-Body Problems in Physics. May 18-22, 2015. Chicago, Illinois, US

Unified ab initio approaches to nuclear structure and reactions

The description of nuclei starting from the constituent nucleons and the realistic interactions among them has been a long-standing goal in nuclear physics. In addition to the complex nature of the nuclear forces, with two-, three- and possibly higher many-nucleon components, one faces the quantum-mechanical many-nucleon problem governed by an interplay between bound and continuum states. In recent years, significant progress has been made in ab initio nuclear structure and reaction calculations based on input from QCD-employing Hamiltonians constructed within chiral effective field theory. After a brief overview of the field, we focus on ab initio many-body approaches - built upon the No-Core Shell Model - that are capable of simultaneously describing both bound and scattering nuclear states, and present results for resonances in light nuclei, reactions important for astrophysics and fusion research. In particular, we review recent calculations of resonances in the $^6$He halo nucleus, of five- and six-nucleon scattering, and an investigation of the role of chiral three-nucleon interactions in the structure of $^9$Be. Further, we discuss applications to the $^7$Be$(p,\gamma)^8$B radiative capture. Finally, we highlight our efforts to describe transfer reactions including the $^3$H$(d,n)^4$He fusion.Comment: Contribution to the Special Physica Scripta Edition - 40 year anniversary - Nobel Prize '75, 71 pages, 29 figure

No-Core Shell Model Analysis of Light Nuclei

The fundamental description of both structural properties and reactions of light nuclei in terms of constituent protons and neutrons interacting through nucleon-nucleon and three-nucleon forces is a long-sought goal of nuclear theory. I will briefly present a promising technique, built upon the {\em ab initio} no-core shell model, which emerged recently as a candidate to reach such a goal: the no-core shell model/resonating-group method. This approach, capable of describing simultaneously both bound and scattering states in light nuclei, complements a microscopic cluster technique with the use of two-nucleon realistic interactions, and a microscopic and consistent description of the nucleon clusters. I will discuss applications to light nuclei binary scattering processes and fusion reactions that power stars and Earth based fusion facilities, such as the deuterium-$^3$He fusion, and outline the progress toward the inclusion of the three-nucleon force into the formalism and the treatment of three-body clusters.Comment: 8 pages, 6 figures, Proceedings of the 20th International IUPAP Conference on Few-Body Problems in Physics, 20 - 25 August, 2012, Fukuoka, Japa

Estudio económico-financiero de una institución financiera: aplicación al Banco Santander

En este TFG trato de exponer como ha sido la evolución del sistema financiero, y un breve análisis de dos de las entidades financieras más importantes del país. Veremos que estrategias han tomado a lo largo del tiempo y una comparación entre ellas analizándolas tanto financiera como económicamente. Se verá brevemente la exposición de estas dos entidades a la crisis y su salida de la misma.In this TFG I try to explain how the evolution of the financial system has been, and a brief analysis of two the most important financial institucions in the country. We will seewhat strategies have been taken over time and we will see a comparison between them, analyzing both the financial and economic aspect. We will briefly see the exposure of these two entities to the crisis and its exit from it.Departamento de Economía Financiera y ContabilidadGrado en Finanzas, Banca y Seguro

The governmental district of the city of Buenos Aires: the dynamic link between politics, conflict and litigation

Este artículo reflexiona sobre las articulaciones que se producen entre el procesamiento de una política urbana, el conflicto suscitado a partir de su implementación y el litigio judicial, en tanto que una de sus dimensiones. Para ello, analiza el proceso de judicialización de un conflicto generado a partir del proyecto de construcción de un centro cívico en un predio -ubicado en la zona sur de la ciudad de Buenos Aires- destinado a la atención de la salud mental. A partir de una estrategia metodológica cualitativa que incorpora el análisis discursivo de documentos jurídicos, se da cuenta de las sucesivas (re)elaboraciones del conflicto cuando ingresa al campo del derecho. Asimismo, se explora cómo las relaciones de poder y las agendas propias de los operadores jurídicos han contribuido en esta redefinición y, por tanto, en el desarrollo del conflicto. Por último, se indaga sobre los efectos de las decisiones judiciales en el procesamiento de la política pública, pero también sobre el modo en que el curso de acción de esta última fue influyendo en el desarrollo del litigio judicial. Así, el análisis de la judicialización de un conflicto por los usos de un espacio urbano invita a complejizar la mirada sobre el rol del Estado en el procesamiento de una política pública, considerando los tres poderes que lo conforman y las tensiones entre ellos.This paper reflects on the linkages between an urban policy, the conflict that arose from its implementation and the litigation, conceived as one of its dimensions. To this end this article analyses the judicialisation of a conflict that arose from the government's intention of building a civic center in a site –located in the south of Buenos Aires city- occupied by three mental health hospitals. Through a qualitative approach that includes the discourse analysis of legal documents, this paper looks into the successive (re)elaboration of the conflict once it becomes a part of the judicial field. In the same way, this work explores how the power relations and the own agendas of legal practitioners contributes to this redefinition. Finally, it delves into the effects of judicial decisions in the development of the public policy, but also gives attentions to the way in which the course of action of the policy influences the judicial process. Thus, this study about the judicialisation of a conflict related to the uses of urban space enables more complex analysis about the role of the three powers of the State regarding the implementation of public policies.Fil: Gonzalez Redondo, Carolina María. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Universidad de Buenos Aires. Facultad de Ciencias Sociales. Instituto de Investigaciones "Gino Germani"; Argentin