Contribución al estudio de las orquídeas de Granada

It is realized a analytical key and a synthesis of the ecology, chorology; bioclimatology and presence of 44 taxa of the Orchidaceae family presents in the province of Granada (Spain).Se realiza una clave analítica y una síntesis de la ecología, corología, bioclimatología y presencia de 44 taxones de la familia Orchidaceae, presentes en la provincia de Granada (España)

Plantas medicinales de Sierra Nevada. I

lt is realized a study of ecological characteres mose important of 204 vegetable taxa of medicinal and toxicological interest, found of wild form in two slopes of Sierra Nevada (Granada, Spain).Se realiza un estudio de los caracteres ecológicos más importantes de 204 taxones vegetales de interés medicinal y toxicológico, encontradas de forma silvestre en las dos vertientes de Sierra Nevada (Granada, España)

Saxifragas de la provincia de Granada (España)

A corologic, ecologic and phytosociologic study about the present Saxifraga species has been done in Granada province.Se ha realizado un estudio coro lógico, ecológico y fitosociológico de las especies del género Saxifraga que se encuentran en la provincia de Granada

Saxifragas de la provincia de Granada (España)

Se ha realizado un estudio coro lógico, ecológico y fitosociológico de las especies del género Saxifraga que se encuentran en la provincia de Granada.A corologic,ecologic and phytosociologic study about the present Saxifraga species has been done in Granada province

Suppression of Coulomb-nuclear interference in the near-barrier elastic scattering of 17 Ne from 208 Pb

The proton drip-line nucleus 17Ne is considered a good candidate for a Borromean two-proton halo with a 15O + p+ pstructure. Angular distributions of the elastic scattering and inclusive 15O production for a 136 MeV 17Ne beam incident on a 208Pb target were measured for the first time at the SPIRAL1 facility, GANIL. Use of the GLORIA detector array allowed high-resolution data over a wide angular range from 20◦up to 95◦in the laboratory frame to be obtained. The elastic scattering angular distribution shows similarities with those for both 6He and 20Ne at equivalent collision energies with respect to the corresponding Coulomb barriers, exhibiting the suppression of the Coulomb rainbow peak characteristic of strong coupling. Optical model and coupled channel fits suggest that this is due to a combination of coupling to low-lying quadrupole resonances and Coulomb dipole coupling to the low-lying continuum, although their relative importance depends on the relevant B(E2)values which remain to be firmly determined

Very high energy particle acceleration powered by the jets of the microquasar SS 433

SS 433 is a binary system containing a supergiant star that is overflowing its Roche lobe with matter accreting onto a compact object (either a black hole or neutron star). Two jets of ionized matter with a bulk velocity of $\sim0.26c$ extend from the binary, perpendicular to the line of sight, and terminate inside W50, a supernova remnant that is being distorted by the jets. SS 433 differs from other microquasars in that the accretion is believed to be super-Eddington, and the luminosity of the system is $\sim10^{40}$ erg s$^{-1}$. The lobes of W50 in which the jets terminate, about 40 pc from the central source, are expected to accelerate charged particles, and indeed radio and X-ray emission consistent with electron synchrotron emission in a magnetic field have been observed. At higher energies (>100 GeV), the particle fluxes of $\gamma$ rays from X-ray hotspots around SS 433 have been reported as flux upper limits. In this energy regime, it has been unclear whether the emission is dominated by electrons that are interacting with photons from the cosmic microwave background through inverse-Compton scattering or by protons interacting with the ambient gas. Here we report TeV $\gamma$-ray observations of the SS 433/W50 system where the lobes are spatially resolved. The TeV emission is localized to structures in the lobes, far from the center of the system where the jets are formed. We have measured photon energies of at least 25 TeV, and these are certainly not Doppler boosted, because of the viewing geometry. We conclude that the emission from radio to TeV energies is consistent with a single population of electrons with energies extending to at least hundreds of TeV in a magnetic field of $\sim16$~micro-Gauss.Comment: Preprint version of Nature paper. Contacts: S. BenZvi, B. Dingus, K. Fang, C.D. Rho , H. Zhang, H. Zho