Long range effects on the optical model of 6He around the Coulomb barrier

El pdf del artículo es la versión pre-print: arXiv:1004.1911v1We present an optical model (OM) analysis of the elastic scattering data of the reactions 6He+27Al and 6He+208Pb at incident energies around the Coulomb barrier. The bare part of the optical potential is constructed microscopically by means of a double folding procedure, using the São Paulo prescription without any renormalization. This bare interaction is supplemented with a Coulomb dipole polarization (CDP) potential, which takes into account the effect of the dipole Coulomb interaction. For this CDP potential, we use an analytical formula derived from the semiclassical theory of Coulomb excitation. The rest of the optical potential is parametrized in terms of Woods-Saxon shapes. In the 6He+208Pb case, the analysis confirms the presence of long range components, in agreement with previous works. Four-body Continuum-Discretized Coupled-Channels calculations have been performed in order to better understand the features of the optical potentials found in the OM analysis. This study searches to elucidate some aspects of the optical potential of weakly bound systems, such as the dispersion relation and the long range (attractive and absorptive) mechanisms. © 2010 Elsevier B.V.This work has been supported by the Spanish Ministerio de Ciencia e Innovación under project FPA2006-13807-C02-01, the local government of Junta de Andalucía under the excellence project P07-FQM-02894 and the Spanish Consolider-Ingenio 2010 Programme CPAN (CSD2007-00042).Peer Reviewe

Powerful Radio Sources in the Southern Sky. I. Optical Identifications

Since the early sixties, our view of radio galaxies and quasars has been drastically shaped by discoveries made thanks to observations of radio sources listed in the Third Cambridge Catalog and its revised version (3CR). However, the largest fraction of data collected to date on 3CR sources was performed with relatively old instruments, rarely repeated and/or updated. Importantly, the 3CR contains only objects located in the Northern Hemisphere, thus having limited access to new and innovative astronomical facilities. To mitigate these limitations, we present a new catalog of powerful radio sources visible from the Southern Hemisphere, extracted from the GLEAM 4 Jy (G4Jy) catalog and based on equivalent selection criteria as the 3CR. This new catalog, named G4Jy-3CRE, where the E stands for equivalent, lists a total of 264 sources at decl. below −5° and with 9 Jy limiting sensitivity at ∼178 MHz. We explored archival radio maps obtained with different surveys and compared them with optical images available in the Pan-STARRS, DES, and DSS databases to search for optical counterparts of their radio cores. We compared mid-infrared counterparts, originally associated in the G4Jy, with the optical ones identified here, and we present results of a vast literature search carried out to collect redshift estimates for all G4Jy-3CRE sources resulting in a total of 145 reliable z measurements

Breakup mechanisms in the He 6 + Zn 64 reaction at near-barrier energies

New experimental results for the elastic scattering of He6 on Zn64 at incident energies of 15.0 and 18.0 MeV and He4 at 17.5 MeV along with results already published at 10.0 and 13.6 MeV, are presented. Elastic and α experimental cross sections are compared with coupled-reaction-channel, continuum-discretized coupled-channel, and DWBA inclusive-breakup models. The large yield of α particles observed at all measured energies can be explained by considering a nonelastic breakup mechanism.Spanish Ministerio de Economía y Competitividad and FEDER funds (FIS2014-53448-C2-1-P, FIS2017-88410P, FPA2016-77689-C2-1-R)European Union’s Horizon 2020 65400

Scattering of light halo nuclei on heavy target at energies around the Coulomb barrier

This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0.-- et al. and the E1104 S1202 collaborations at TRIUMF.-- Trabajo presentado a la: "25th International Nuclear Physics Conference" (INPC), celebrada en Firenze (Italia) del 2 al 7 de junio de 2013.We report here on experiments performed at TRIUMF to study the scattering of the light halo nuclei 11Li on lead at energies below and around the Coulomb barrier. The the elastic and break-up differential cross section are interpreted in the framework of Continuum-Discretized Coupled-Channel calculations. The departure from Rutherford scattering at energies below the barrier is well beyond the behavior of normal nuclei.This work was supported by the Spanish CICYT under the project numbers FPA2009-07387, FPA2012-32443, FPA2009-08848, FPA2009-07653, and FPA2010-22131-C02-01 and by the Consolider Ingenio 2010 Program CPAN (CSD2007- 00042).Peer Reviewe

Li-11 structural information from inclusive break-up measurements

IWM-EC 2014 – International Workshop on Multi facets of EoS and Clustering.-- et al.Structure information of 11Li halo nucleus has been obtained from the inclusive break-up measurements of the 11Li+208Pb reactions at energies around the Coulomb barrier (Elab = 24.3 and 29.8 MeV). The effective break-up energy and the slope of B(E1) distribution close to the threshold have been extracted from the experimental data.Peer Reviewe

Understanding the mechanisms of nuclear collisions: A complete study of the B 10 + Sn 120 reaction

Background: Reactions involving exotic and stable weakly bound nuclei have been extensively studied in recent years. Although several models have been successfully used to explain particular reaction outcomes, the answers to many questions remain elusive. In previous works, we presented elastic, inelastic, and transfer angular distributions for the B10+Sn120 system measured at ELab=31.5, 33.0, 35.0, and 37.5 MeV. The data set was analyzed through coupled reaction channels calculations in the context of the double-folding São Paulo potential. Purpose: We investigate nuclear reaction mechanisms for systems involving weakly bound projectiles. Method: Angular distributions for several nuclear reaction processes were measured for the B10+Sn120 system at ELab=39.70 MeV. Results: The new data set involves angular distributions for elastic scattering, projectile and target inelastic excitations, one-neutron pickup transfer, one-proton stripping transfer, deuteron pickup transfer, and He3,4 stripping transfer. We have also observed Be10 nuclei. The effect of the couplings to some nonelastic states on the angular distributions is discussed. Conclusion: The theoretical calculations within the coupled reaction channels formalism provide an overall good agreement with the corresponding inelastic, one-neutron stripping, one-proton pickup, one-deuteron pickup, and He3 stripping transfer data. However, to improve the description of the elastic scattering angular distribution, the inclusion of additional channels in the coupling scheme might be necessary.Fil: Gasques, L. R.. Universidade de Sao Paulo; BrasilFil: Alvarez, M. A. G.. Universidad de Sevilla; EspañaFil: Arazi, Andres. Comisión Nacional de Energía Atómica. Gerencia del Área de Investigación y Aplicaciones No Nucleares. Gerencia Física (Centro Atómico Constituyentes). Proyecto Tandar; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; ArgentinaFil: Carlson, B. V.. Instituto Tecnológico de Aeronáutica; BrasilFil: Chamon, L. C.. Universidade de Sao Paulo; BrasilFil: Fernández García, J. P.. Universidad de Sevilla; EspañaFil: Lépine Szily, A.. Universidade de Sao Paulo; BrasilFil: Lubian, J.. Universidade Federal Fluminense; BrasilFil: Rangel, J.. Universidade Federal Fluminense; BrasilFil: Rodríguez Gallardo, M.. Universidad de Sevilla; EspañaFil: Scarduelli, V.. Universidade de Sao Paulo; BrasilFil: Zagatto, V. A. B.. Universidade Federal Fluminense; Brasi

Systematic study of optical potential strengths in reactions on Sn 120 involving strongly bound, weakly bound, and exotic nuclei

We present new experimental angular distributions for the elastic scattering of Li6+Sn120 at three bombarding energies. We include these data in a wide systematic involving the elastic scattering of He4,6,Li7, Be9,B10, and O16,18 projectiles on the same target at energies around the respective Coulomb barriers. Considering this data set, we report on optical model analyses based on the double-folding São Paulo potential. Within this approach, we study the sensitivity of the data fit to different models for the nuclear matter densities and to variations in the optical potential strengths.Fil: Alvarez, M. A. G.. Universidad de Sevilla; EspañaFil: Fernández García, J. P.. Universidad de Sevilla; EspañaFil: León García, J. L.. Universidad de Sevilla; EspañaFil: Rodríguez Gallardo, M.. Universidad de Sevilla; EspañaFil: Gasques, L. R.. Universidade de Sao Paulo; BrasilFil: Chamon, L. C.. Universidade de Sao Paulo; BrasilFil: Zagatto, V. A. B.. Universidade de Sao Paulo; BrasilFil: Lépine Szily, A.. Universidade de Sao Paulo; BrasilFil: Oliveira, J. R. B.. Universidade de Sao Paulo; BrasilFil: Scarduelli, V.. Universidade Federal Fluminense; BrasilFil: Carlson, B. V.. Instituto Tecnologico de Aeronautica.; BrasilFil: Casal, J.. Istituto Nazionale Di Fisica Nucleare.; ItaliaFil: Arazi, Andres. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina. Comisión Nacional de Energía Atómica; ArgentinaFil: Torres, D. A.. Universidad Nacional de Colombia; ColombiaFil: Ramirez, F.. Universidad Nacional de Colombia; Colombi

Epilepsia del lóbulo temporal. Revisión sistemática de la literatura y presentación de un caso clínico probable: Vincent Van Gogh

Introducción: La epilepsia afecta a 1% de la población y representa un problema de salud, por la evidente repercusión en la vida laboral y social del individuo que la padece. La manifestación clínica de la epilepsia son las crisis epilépticas y la gran mayoría de los casos corresponden a la del lóbulo temporal y su anormalidad anatómica más habitual es la esclerosis del Hipocampo que representa entre el 25-35% de los casos, siendo más frecuente en la edad adulta. Para finales del siglo xix se diagnosticó al pintor Vincent Van Gogh como epiléptico y con la fama alcanzada después de su muerte en 1891, se han hecho una cantidad impresionante de diagnósticos que abarcan los campos de: la psiquiatría, la neurología y la medicina interna, por lo que el propósito de esta revisión es dar una idea lo más aproximada posible de la enfermedad de este gran pintor, que quizá mucho influyó en sus pinturas. Material y métodos: Se realizaron revisiones sistemáticas, metaanálisis y artículos del The New England Journal of Medicina, The Lancet, JAMA y Neurology, utilizando las bases de datos de www.mdconsult.com, www.aha.com, www.online.ca/medline, y se eligieron los artículos que estuvieran enfocados en los cambios que se presentan en el pensamiento y en el comportamiento de los pacientes con epilepsia temporal y se relacionó con lo escrito acerca de Van Gogh. Resultados y Discusión: El cuadro clínico más probable, en el caso de Vincent Van Gogh, puede atribuirse a Epilepsia Parcial del Lóbulo Temporal, lo que explica los cambios en su comportamiento y estados de ánimo. Desgraciadamente como sucede con estos grandes personajes no hay por el momento técnicas que nos permitan reconstruir vívidamente la vida y obra de alguien como Van Gogh, cuyos cuadros en la actualidad se cotizan en millones de dólares. Conclusiones: Los expertos en la vida y enfermedad de Vincent Van Gogh lo califican como epilepsia del lóbulo temporal con síntomas caracterizados por periodos de agitación confusional y en ocasiones alucinaciones, cuadro que se agravó con los años, lo que lo convirtió por un lado en un “aparente loco peligroso” que atentó contra los demás y con su propia persona hasta ocasionarse la muerte, sin embargo, la enfermedad del lóbulo temporal y del cerebro en general, pudo dar origen a uno de los pintores más grandes y famosos.   Abstract Introduction: Epilepsy affects 1% of the population and represents a health problem, with evident repercussion in the work and social life of the individual who suffers it. The clinical manifestation of epilepsy are epileptic seizures and the vast majority of cases correspond to the temporal lobe and its most common anatomical abnormality is sclerosis of the hippocampus and represents between 25-35% of cases, being more frequent in the adulthood. By the end of the 19th century the painter Vincent Van Gogh was diagnosed as an epileptic and with the fame attained after his death in 1891, an impressive number of diagnoses have been made covering the fields of psychiatry, neurology and internal medicine so that the purpose of this review is to give an idea as close as possible to the illness of this great painter, illness who perhaps influenced his paintings. Material and methods: We searched systematic reviews, meta-analyzes and articles from The New England Journal of Medicine, The Lancet, JAMA and Neurology using the databases of www.mdconsult.com, www.aha.com, www.online.ca/medline, and it was sought that the articles were focused on the changes that occur in the thinking and behavior of patients with temporal epilepsy and related to the written about Van Gogh. Results and Discussion: The most probable clinical picture in the case of Vincent Van Gogh can be attributed to Partial Epilepsy of the Temporary Lobe which explains the changes in his behavior and moods. Unfortunately as it happens with these great characters there are no techniques at the moment that allow us to vividly reconstruct the life and work of someone like Van Gogh whose paintings are currently listed in millions of dollars. Conclusions: Experts in the life and illness of Vincent Van Gogh describe it as temporal lobe epilepsy with symptoms characterized by periods of confusional agitation and sometimes hallucinations, a picture that worsened over the years, which turned it into a “Apparent crazy dangerous” who tried against others and with his own person until death occurred and on the other side that attack to the temporal lobe and the brain in general gave way to one of the greatest and famous painters.   &nbsp

Epilepsia del lóbulo temporal. Revisión sistemática de la literatura y presentación de un caso clínico probable: Vincent Van Gogh

Introducción: La epilepsia afecta a 1% de la población y representa un problema de salud, por la evidente repercusión en la vida laboral y social del individuo que la padece. La manifestación clínica de la epilepsia son las crisis epilépticas y la gran mayoría de los casos corresponden a la del lóbulo temporal y su anormalidad anatómica más habitual es la esclerosis del Hipocampo que representa entre el 25-35% de los casos, siendo más frecuente en la edad adulta. Para finales del siglo xix se diagnosticó al pintor Vincent Van Gogh como epiléptico y con la fama alcanzada después de su muerte en 1891, se han hecho una cantidad impresionante de diagnósticos que abarcan los campos de: la psiquiatría, la neurología y la medicina interna, por lo que el propósito de esta revisión es dar una idea lo más aproximada posible de la enfermedad de este gran pintor, que quizá mucho influyó en sus pinturas. Material y métodos: Se realizaron revisiones sistemáticas, metaanálisis y artículos del The New England Journal of Medicina, The Lancet, JAMA y Neurology, utilizando las bases de datos de www.mdconsult.com, www.aha.com, www.online.ca/medline, y se eligieron los artículos que estuvieran enfocados en los cambios que se presentan en el pensamiento y en el comportamiento de los pacientes con epilepsia temporal y se relacionó con lo escrito acerca de Van Gogh. Resultados y Discusión: El cuadro clínico más probable, en el caso de Vincent Van Gogh, puede atribuirse a Epilepsia Parcial del Lóbulo Temporal, lo que explica los cambios en su comportamiento y estados de ánimo. Desgraciadamente como sucede con estos grandes personajes no hay por el momento técnicas que nos permitan reconstruir vívidamente la vida y obra de alguien como Van Gogh, cuyos cuadros en la actualidad se cotizan en millones de dólares. Conclusiones: Los expertos en la vida y enfermedad de Vincent Van Gogh lo califican como epilepsia del lóbulo temporal con síntomas caracterizados por periodos de agitación confusional y en ocasiones alucinaciones, cuadro que se agravó con los años, lo que lo convirtió por un lado en un “aparente loco peligroso” que atentó contra los demás y con su propia persona hasta ocasionarse la muerte, sin embargo, la enfermedad del lóbulo temporal y del cerebro en general, pudo dar origen a uno de los pintores más grandes y famosos.   Abstract Introduction: Epilepsy affects 1% of the population and represents a health problem, with evident repercussion in the work and social life of the individual who suffers it. The clinical manifestation of epilepsy are epileptic seizures and the vast majority of cases correspond to the temporal lobe and its most common anatomical abnormality is sclerosis of the hippocampus and represents between 25-35% of cases, being more frequent in the adulthood. By the end of the 19th century the painter Vincent Van Gogh was diagnosed as an epileptic and with the fame attained after his death in 1891, an impressive number of diagnoses have been made covering the fields of psychiatry, neurology and internal medicine so that the purpose of this review is to give an idea as close as possible to the illness of this great painter, illness who perhaps influenced his paintings. Material and methods: We searched systematic reviews, meta-analyzes and articles from The New England Journal of Medicine, The Lancet, JAMA and Neurology using the databases of www.mdconsult.com, www.aha.com, www.online.ca/medline, and it was sought that the articles were focused on the changes that occur in the thinking and behavior of patients with temporal epilepsy and related to the written about Van Gogh. Results and Discussion: The most probable clinical picture in the case of Vincent Van Gogh can be attributed to Partial Epilepsy of the Temporary Lobe which explains the changes in his behavior and moods. Unfortunately as it happens with these great characters there are no techniques at the moment that allow us to vividly reconstruct the life and work of someone like Van Gogh whose paintings are currently listed in millions of dollars. Conclusions: Experts in the life and illness of Vincent Van Gogh describe it as temporal lobe epilepsy with symptoms characterized by periods of confusional agitation and sometimes hallucinations, a picture that worsened over the years, which turned it into a “Apparent crazy dangerous” who tried against others and with his own person until death occurred and on the other side that attack to the temporal lobe and the brain in general gave way to one of the greatest and famous painters.   &nbsp