Measurement of the Fermi Constant by FAST

An initial measurement of the lifetime of the positive muon to a precision of 16 parts per million (ppm) has been performed with the FAST detector at the Paul Scherrer Institute. The result is tau_mu = 2.197083 (32) (15) microsec, where the first error is statistical and the second is systematic. The muon lifetime determines the Fermi constant, G_F = 1.166353 (9) x 10^-5 GeV^-2 (8 ppm).Comment: 15 pages, 6 figure

Feminist discursive practices: analysis of slogans in the demonstration of March 8th in Bilbao

La movilización por la celebración del 8 de marzo de 2019 en Bilbao recibió un apoyo sin precedentes entre las manifestaciones convocadas por las organizaciones feministas hasta la fecha. En este contexto, esta investigación se propuso como objetivo analizar los lemas de las pancartas que fueron portadas por mujeres participantes a título particular en la movilización de ese día. Partiendo de una metodología cualitativa y del análisis crítico del discurso, se analizó una muestra de 154 lemas. Los resultados pusieron de manifiesto un foco discursivo centrado en la violencia, la igualdad y la lucha que interpelaba a la sociedad, a la vez que se detectaron voces individualistas que valoraban la libre elección y el empoderamiento individual por encima de los valores colectivos de solidaridad. El análisis evidencia la falta de homogeneidad en la lucha feminista, en la que conviven voces diversas, en ocasiones divergentes e incluso en conflicto, que apuntan a formas múltiples de entender al propio feminismo como un movimiento polifónico, dinámico y fluido.The mobilization for the Women’s Day in Bilbao, 2019, received unprecedented support among the demonstrations called by feminist organizations to date. In this context, this research aimed to analyze the slogans of the banners carried by those women who joined the march individually but not belonged to the Feminist Movement. Using a qualitative methodology and critical discourse analysis, a sample of 154 slogans was analyzed. The results revealed a discursive focus on violence, equality and struggle that challenged society, while individualistic voices were detected that valued free choice and individual empowerment over collective values of solidarity. The analysis shows how the feminist struggle is far from being homogeneous, allowing for diverse, sometimes divergent and even contested voices, which show multiple ways of understanding feminism as a dynamic and fluid polyphonic movement

La neumografia retroperitonealdirecta frente a otras técnicas radioloógicas de contraste negativo para la visualización del riñón en la especie canina

Proponemos el uso de una nueva técnica radiológica para la visualización de los riñones, la neumografia retroperitoneal directa, una técnica sencilla y segura, en la que se obtienen imágenes de gran calidad y que nos permite visualizar selectivamente uno o ambos riñones a partir de un único punto de insuflación. Desarrollarnos un modelo experimental en el que se compara esta técnica con la neumoperitoneografía y la neumografía retroperítoneal presacra, valorando la calidad de las imágenes, el grado de dificultad y la seguridad de las mismas.The use of a new radiological technique for kidneys visualization isproposed, the direct retroperitoneal pneumograpby; an easy and safe technique which gives high qua lity images, visualizing selectively one or both kidneys starting from only one insufflation point. An experimental model of comparison between the direct retroperitoneal pneumograpby, the pneumoperitoneograpby and the pararectal retroperitoneal neumography is carried out; estimating the images qua lity, the difficulty level and the security ofthis techniques

Anisotropy of particle fluxes in primary cosmic rays measured with the alpha magnetic spectrometer on the ISS

An analysis of anisotropies in the arrival directions of galactic electrons and positrons, as well as protons, Helium, Carbon and Oxygen has been performed with the Alpha Magnetic Spectrometer on the International Space Station using the first 6.5 years (electrons and positrons) and the first 7.5 years (protons, Helium, Carbon, Oxygen) of data taking. Results on a dipole signal in Galactic coordinates are reported. The arrival directions of all studied cosmic ray species are consistent with isotropy. For energies above 16 GeV a limit of δ < 0.019 (δ < 0.005) at the 95% confidence level is obtained for positrons (electrons). For rigidities above 200 GV a limit of δ < 0.0038 (δ < 0.0036, δ < 0.019,δ < 0.017) at the 95% confidence level is obtained for protons (Helium, Carbon, Oxygen). The quoted limits are based on a total of $9.9 \times 10^{4}$ ($1.3 \times 10^6,~2 \times10^6,~ 2.2 \times10^6,~ 6.1 \times10^4,~6.3 \times10^4$ ) positron (electron, proton, Helium, Carbon, Oxygen) events

The AMS-02 RICH Imager Prototype - In-Beam Tests with 20 GeV/c per Nucleon Ions -

A prototype of the AMS Cherenkov imager (RICH) has been tested at CERN by means of a low intensity 20 GeV/c per nucleon ion beam obtained by fragmentation of a primary beam of Pb ions. Data have been collected with a single beam setting, over the range of nuclear charges 2<Z<~45 in various beam conditions and using different radiators. The charge Z and velocity beta resolutions have been measured.Comment: 4 pages, contribution to the ICRC 200

The Ring Imaging Cherenkov detector (RICH) of the AMS experiment

The Alpha Magnetic Spectrometer (AMS) experiment to be installed on the International Space Station (ISS) will be equipped with a proximity focusing Ring Imaging Cherenkov (RICH) detector for measuring the electric charge and velocity of the charged cosmic particles. A RICH prototype consisting of 96 photomultiplier units, including a piece of the conical reflector, was built and its performance evaluated with ion beam data. Preliminary results of the in-beam tests performed with ion fragments resulting from collisions of a 158 GeV/c/nuc primary beam of Indium ions (CERN SPS) on a Pb target are reported. The collected data included tests to the final front-end electronics and to different aerogel radiators. Cherenkov rings for a large range of charged nuclei and with reflected photons were observed. The data analysis confirms the design goals. Charge separation up to Fe and velocity resolution of the order of 0.1% for singly charged particles are obtained.Comment: 29th International Conference on Cosmic Rays (Pune, India