El magmatismo (Ortoneises y volcanismo del Ordovícico Superior) del Paleozoico de los Catalánides.

En el presente trabajo se caracterizan petrológica y geoquímicamente las rocas metavolcánicas del Ordovícico Superior de los Catalánides (Gavarres y Guilleries) y los ortoneises de las Guilleries. Estos últimos se encuentran en disposición estratiforme en materiales metasedimentarios cuya edad supuesta es Proterozoico Superior o Cámbrico Inferior. Las rocas metavolcánicas están constituidas por metarriolitas masivas y tobas dacítico-riolíticas con abundante mezcla de material fragmentario. Corresponden a un volcanismo explosivo subaéreo y de carácter freatomagmático. Sus caracteres geoquímicos lo definen como los términos ácidos de una secuencia calcoalcalina de procedencia cortical emplazada postcolisionalmente dentro de un contexto extensivo. El modelo de REE indica que se trata de fundidos poco fraccionados procedentes de la fusión de una corteza reciclada. Los "Ortoneises de las Guilleries" corresponden a leuconeises biotíticos con granate. Sus caracteres geoquímicos los caracterizan como metagranilos alumínicos de procedencia cortical. Sus espectros geoquímicos (elementos incompatibles y REE) presentan pautas análogas a los de las rocas metavolcánicas e indican que se trata de fundidos de procedencia cortical de baja alcalinidad emplazados en un contexto anorogénico. La ausencia de correlación geoquímica y de pautas de fraccionación entre metavolcanitas y ortoneises descarta la idea de una fuente común para ambos

Production of new neutron-rich isotopes of heavy elements in fragmentation reactions of 238^{238}U projectiles at 1 A GeV

The production of heavy neutron-rich nuclei has been investigated using cold fragmentation reactions of $^{238}$U projectiles at relativistic energies. The experiment performed at the high-resolving-power magnetic spectrometer FRS at GSI allowed to identify 45 new heavy neutron-rich nuclei: $^{205}$Pt, $^{207-210}$Au, $^{211-216}$Hg, $^{213-217}$Tl, $^{215-220}$Pb, $^{219-224}$Bi, $^{221-227}$Po, $^{224-229}$At, $^{229-231}$Rn and $^{233}$Fr. The production cross sections of these nuclei were also determined and used to benchmark reaction codes that predict the production of nuclei far from stability.Comment: 5 pages, 2 figure

Mining minerals and critical raw materials from bittern: Understanding metal ions fate in saltwork ponds

Seawater represents a potential resource for raw materials extraction. Although NaCl is the most representative mineral extracted other valuable compounds such as Mg, Li, Sr, Rb and B and elements at trace level (Cs, Co, In, Sc, Ga and Ge) are also contained in this "liquid mine". Most of them are considered as Critical Raw Materials by the European Union. Solar saltworks, providing concentration factors of up-to 20 to 40, offer a perfect platform for the development of minerals and metal recovery schemes taking benefit of the concentration and purification achieved along the evaporation saltwork ponds. However, the geochemistry of these elements in this environment has not been yet thoroughly evaluated. Their knowledge could enable the deployment of technologies capable to achieve the recovery of valuable minerals. The high ionic strengths expected (0.5-7 mol/kg) and the chemical complexity of the solutions imply that only numerical geochemical codes, as PHREEQC, and the use of Pitzer model to estimate the activity coefficients of the different species in solution can be adopted to provide valuable description of the systems. In the present work, for the first time, PHREEQC Pitzer code database was extended to include the target minor and trace elements using Trapani saltworks (Sicily, Italy) as a case study system. The model was able to predict: i) the purity in halite and the major impurities contained, mainly Ca, Mg and sulphate species; ii) the fate of minor components as B, Sr, Cs, Co, Ge and Ga along the evaporation ponds. The results obtained pose a fundamental step in critical raw materials mining from seawater brine, for process intensification and combination with desalination

La Estrategia: Un Análisis de su Evolución desde la Cienciometría

The field of study of the strategy has undergone various changes over time, specializing in different the-mes. The main objective of this article is to highlight the evolution of the field of strategy in the area of orga-nisations and administration. For this purpose, a bibliometric analysis was carried out by means of a temporal study covering ten-year periods from 1976 to 2015, with the aim of evidencing those trends and changes in the themes worked on in this field. The results show that from 1976 to 2005 there have been very few changes in the subjects studied. However, as of 2006, profound changes in traditional trends are highlighted, as well as the appearance of emerging trends.El campo de estudio de la estrategia ha sufrido distintos cambios a lo largo del tiempo, especializándose en distintas temáticas. El principal objetivo de este artículo es evidenciar la evolución del campo de la estrategia en el área de las organizaciones y la administración. Para ello se realizó un análisis bibliométrico mediante un estudio temporal, abarcando periodos de diez años desde 1976 hasta 2015, con el fin de evidenciar aquellas tendencias y cambios en las temáticas trabajadas en este campo. Los resultados muestran que desde el año 1976 hasta 2005 los cambios en las temáticas estudiadas han sido muy pocos. Sin embargo, a partir del año 2006 se resaltan cambios profundos en las tendencias tradicionales, además del surgimiento de tendencias emergentes

La campaña contra los sacerdotes pederastas (1880-1912): un ejemplo de «pánico moral» en la España de la Restauración

This article analyses the campaign promoted by the anticlerical republican press in Restoration Spain against the abuses committed by «paedophile» priests. Based on approximately 400 news items on the subject, taken from the anticlerical press of the time (1880-1912), a total of 151 cases related to pederasty abuses perpetrated by the clergy have been verified. The methodology used is based on the American sociology of «moral panics». After introducing the problem, the sources and chronology, the phases that mark the construction process of this moral panic regarding pederast priests are delineated. Attention is then drawn to the parallelism between the aforementioned journalistic campaign and the growing anticlerical offensive between 1898 and 1912. Finally, the journalistic crusade against paedophile priests is analysed as a political catalyst for struggles that also involve the domination of gender, age and social clas

Chiral three-nucleon forces and bound excited states in neutron-rich oxygen isotopes

We study the spectra of neutron-rich oxygen isotopes based on chiral two- and three-nucleon interactions. First, we benchmark our many-body approach by comparing ground-state energies to coupled-cluster results for the same two-nucleon interaction, with overall good agreement. We then calculate bound excited states in 21,22,23O, focusing on the role of three-nucleon forces, in the standard sd shell and an extended sdf7/2p3/2 valence space. Chiral three-nucleon forces provide important one- and two-body contributions between valence neutrons. We find that both these contributions and an extended valence space are necessary to reproduce key signatures of novel shell evolution, such as the N = 14 magic number and the low-lying states in 21O and 23O, which are too compressed with two-nucleon interactions only. For the extended space calculations, this presents first work based on nuclear forces without adjustments. Future work is needed and open questions are discussed.Comment: 6 pages, 4 figures, published versio

Extending the north-east limit of the chart of nuclides

The existence of nuclei with exotic combinations of protons and neutrons provides fundamental information on the forces acting between nucleons. The maximum number of neutrons a given number of protons can bind, neutron drip line1, is only known for the lightest chemical elements, up to oxygen. For heavier elements, the larger its atomic number, the farther from this limit is the most neutron-rich known isotope. The properties of heavy neutron-rich nuclei also have a direct impact on understanding the observed abundances of chemical elements heavier than iron in our Universe. Above half of the abundances of these elements are thought to be produced in rapid-neutron capture reactions, r-process, taking place in violent stellar scenarios2 where heavy neutron-rich nuclei, far beyond the ones known up today, are produced. Here we present a major step forward in the production of heavy neutron-rich nuclei: the discovery of 73 new neutron-rich isotopes of chemical elements between tantalum (Z=72) and actinium (Z=89). This result proves that cold-fragmentation reactions3 at relativistic energies are governed by large fluctuations in isospin and energy dissipation making possible the massive production of heavy neutron-rich nuclei, paving then the way for the full understanding of the origin of the heavier elements in our Universe. It is expected that further studies providing ground and structural properties of the nuclei presented here will reveal further details on the nuclear shell evolution along Z=82 and N=126, but also on the understanding of the stellar nucleosyntheis r-process around the waiting point at A~190 defining the speed of the matter flow towards heavier fissioning nuclei

Search for very high energy gamma radiation from the radio bright region DR4 of the SNR G78.2+2.1

Data from the HEGRA air shower array are used to set an upper limit on the emission of gamma-radiation above 25 (18) TeV from the direction of the radio bright region DR4 within the SNR G78.2 + 2.1 of 2.5 (7.1). 10^-13 cm^-2 sec^-1. The shock front of SNR G78.2 + 2.1 probably recently overtook the molecular cloud Gong 8 which then acts as a target for the cosmic rays produced within the SNR, thus leading to the expectation of enhanced gamma-radiation. Using a model of Drury, Aharonian and Völk which assumes that SNRs are the sources of galactic cosmic rays via first order Fermi acceleration, we calculated a theoretical prediction for the gamma-ray flux from the DR4 region and compared it with our experimental flux limit. Our 'best estimate' value for the predicted flux lies a factor of about 18 above the upper limit for gamma-ray energies above 25 TeV. Possible reasons for this discrepancy are discussed

Properties of the CsI(Tl) detector elements of the CALIFA detector

In the R3B experiment at FAIR, charged particles with energies up to 600 MeV and forward boosted γ-rays with energies up to 20 MeV need to be detected in scattering experiments. Calorimeters for nuclear physics experiments of this kind, using relativistic radioactive ion beams, require high energy resolution and high efficiency for simultaneous detection of strongly Doppler shifted γ-rays and high-energy charged particles. A calorimeter design that can meet these requirements, using CsI(Tl) scintillators, results in detector elements that may exhibit light output variations with crystal depth, which can limit the attainable resolution. In this paper we present results from a systematic study of 478 detector modules of CALIFA, the R3B calorimeter, in order to determine and minimize such variations. To facilitate further systematic studies we also present results for the total absorption length of the scintillation light, using spectrophotometry, light crosstalk between adjacent detector modules, and surface topography of the CsI(Tl) crystals from atomic force microscopy.Swedish research council | Ref. 2017-03986Swedish research council | Ref. 2014-06644Swedish research council | Ref. 2013-04178Swedish research council | Ref. 2012-04550BMBF, Alemania | Ref. 05P15WOFNABMBF, Alemania | Ref. 05P19WOFN1BMBF, Alemania | Ref. 05P15RDFN1BMBF, Alemania | Ref. 05P19RDFN

Search for composite and exotic fermions at LEP2

A search for unstable heavy fermions with the DELPHI detector at LEP is reported. Sequential and non-canonical leptons, as well as excited leptons and quarks, are considered. The data analysed correspond to an integrated luminosity of about 48 pb^{-1} at an e^+e^- centre-of-mass energy of 183 GeV and about 20 pb^{-1} equally shared between the centre-of-mass energies of 172 GeV and 161 GeV. The search for pair-produced new leptons establishes 95% confidence level mass limits in the region between 70 GeV/c^2 and 90 GeV/c^2, depending on the channel. The search for singly produced excited leptons and quarks establishes upper limits on the ratio of the coupling of the excited fermion