230 research outputs found
Entre Castellnovo y Segorbe: dos conflictos de aguas en el siglo XIV
El conflicto social es, sin lugar a duda, un aspecto fundamental en el estudio de los regadíos históricos, puesto que se ha visto en él un factor de estímulo de la actividad, un moldeador de las gestiones de control social, y un reflejo de las dinámicas internas y externas de las comunidades de regantes tradicionales. Este trabajo tiene el objetivo de aportar dos nuevos documentos inéditos sobre la conflictividad hidráulica presente en el tramo alto del río Palancia durante el siglo XIV
Identification of a millisecond isomeric state in 129Cd81 via the detection of internal conversion and Compton electrons
published_or_final_versio
rp-Process weak-interaction mediated rates of waiting-point nuclei
Electron capture and positron decay rates are calculated for
neutron-deficient Kr and Sr waiting point nuclei in stellar matter. The
calculation is performed within the framework of pn-QRPA model for rp-process
conditions. Fine tuning of particle-particle, particle-hole interaction
parameters and a proper choice of the deformation parameter resulted in an
accurate reproduction of the measured half-lives. The same model parameters
were used to calculate stellar rates. Inclusion of measured Gamow-Teller
strength distributions finally led to a reliable calculation of weak rates that
reproduced the measured half-lives well under limiting conditions. For the
rp-process conditions, electron capture and positron decay rates on Kr
and Sr are of comparable magnitude whereas electron capture rates on
Sr and Kr are 1--2 orders of magnitude bigger than the
corresponding positron decay rates. The pn-QRPA calculated electron capture
rates on Kr are bigger than previously calculated. The present
calculation strongly suggests that, under rp-process conditions, electron
capture rates form an integral part of weak-interaction mediated rates and
should not be neglected in nuclear reaction network calculations as done
previously.Comment: 13 pages, 4 figures, 4 tables; Astrophysics and Space Science (2012
Deformation of the N=Z nucleus 76Sr using beta-decay studies
A novel method of deducing the deformation of the N=Z nucleus 76Sr is
presented. It is based on the comparison of the experimental Gamow-Teller
strength distribution B(GT) from its beta decay with the results of QRPA
calculations. This method confirms previous indications of the strong prolate
deformation of this nucleus in a totally independent way. The measurement has
been carried out with a large Total Absorption gamma Spectrometer, "Lucrecia",
newly installed at CERN-ISOLDE.Comment: Accepted in Phys. Rev. Letter
ATLAS silicon module assembly and qualification tests at IFIC Valencia
ATLAS experiment, designed to probe the interactions of particles emerging
out of proton proton collisions at energies of up to 14 TeV, will assume
operation at the Large Hadron Collider (LHC) at CERN in 2007. This paper
discusses the assembly and the quality control tests of forward detector
modules for the ATLAS silicon microstrip detector assembled at the Instituto de
Fisica Corpuscular (IFIC) in Valencia. The construction and testing procedures
are outlined and the laboratory equipment is briefly described. Emphasis is
given on the module quality achieved in terms of mechanical and electrical
stability.Comment: 23 pages, 38 EPS figures, uses JINST LaTeX clas
Chiral unitary approach to S-wave meson baryon scattering in the strangeness S=0 sector
We study the S-wave interaction of mesons with baryons in the strangeness S=0
sector in a coupled channel unitary approach. The basic dynamics is drawn from
the lowest order meson baryon chiral Lagrangians. Small modifications inspired
by models with explicit vector meson exchange in the t-channel are also
considered. In addition the pi pi N channel is included and shown to have an
important repercussion in the results, particularly in the isospin 3/2 sector.Comment: 23 pages, LaTeX, 21 figure
Characterization of a novel proton-CT scanner based on Silicon and LaBr(Ce) detectors
Treatment planning systems at proton-therapy centres generally use X-ray
computed tomography (CT) as primary imaging technique to infer the proton
treatment doses to tumour and healthy tissues. However, proton stopping powers
in the body, as derived from X-ray images, suffer from important proton-range
uncertainties. In order to reduce this uncertainty in range, one could use
proton-CT images instead. The main goal of this work is to test the
capabilities of a newly-developed proton-CT scanner, based on the use of a set
of tracking detectors and a high energy resolution scintillator for the
residual energy of the protons. Different custom-made phantoms were positioned
at the field of view of the scanner and were irradiated with protons at the CCB
proton-therapy center in Krakow. We measured with the phantoms at different
angles and produced sinograms that were used to obtain reconstructed images by
Filtered Back-Projection (FBP). The obtained images were used to determine the
capabilities of our scanner in terms of spatial resolution and proton Relative
Stopping Power mapping and validate its use as proton-CT scanner. The results
show that the scanner can produce medium-high quality images, with spatial
resolution better than 2 mm in radiography, below 3 mm in tomography and
resolving power in the RSP comparable to other state of the art pCT cameras
Forward SCT Module Assembly and Quality Control at IFIC Valencia
This note discusses the assembly and the quality control tests of 282 forward detector modules for the ATLAS Semiconductor Tracker assembled at the Instituto de Fisica Corpuscular (IFIC) in Valencia. The construction and testing procedures are outlined and the laboratory equipment is briefly described. Emphasis is given on the module quality achieved in terms of mechanical and electrical stability
Proton radiographs using position-sensitive silicon detectors and high-resolution scintillators
Proton therapy is a cancer treatment technique currently in growth worldwide.
It offers advantages with respect to conventional X-ray and -ray
radiotherapy, in particular, a better control of the dose deposition allowing
to reach a higher conformity in the treatments. Therefore, it causes less
damage to the surrounding healthy tissue and less secondary effects. However,
in order to take full advantage of its potential, improvements in treatment
planning and dose verification are required. A new prototype of proton Computed
Tomography scanner is proposed to design more accurate and precise treatment
plans for proton therapy. Here, results obtained from an experiment performed
using a 100-MeV proton beam at the CCB facility in Krakow (Poland) are
presented. Proton radiographs of PMMA samples of 50-mm thickness with spatial
patterns in aluminum were taken. Their properties were studied, including
reproduction of the dimensions, spatial resolution and sensitivity to different
materials. They demonstrate the capabilities of the system to produce images
with protons. Structures of up to 2 mm are nicely resolved and the sensitivity
of the system was enough to distinguish thicknesses of 10 mm of aluminum or
PMMA. This constitutes a first step to validate the device as a proton
radiography scanner previous to the future tests as a proton CT scanner.Comment: 7 pages, 11 figures, submitted to IEEE TNS ANIMMA 2021 Conference
Proceeding
Reaction of the halo nucleus be on heavy targets at energies around the coulomb barrier
Presented at the XXXIII Mazurian Lakes Conference on Physics, Piaski, Poland, September 1–7, 2013.-- et al.New data for the reaction 11Be on 197Au at E lab = 31:9 MeV are presented. The angular distributions of the inelastically scattered 11Be and the 10Be fragments coming from the 11Be dissociation have been extracted and compared with semiclassical and coupled-channels calculations in an angular range θlab = 13deg;-46deg; for the detected Be fragment.This work was supported by the Spanish Government under the projects FPA2009-07387, FPA2009-07653, FPA2009-08848, FPA2012-32443 and Consolider
CPAN CSD2007-00042; the Helmholtz Association (HGT) through the Nuclear Astrophysics Virtual Institute (VH-VI-417); ATI Sistemas;
a Natural Sciences and Engineering Research Council of Canada grant. TRIUMF receives federal funding via a contribution agreement through the National Research Council of Canada.Peer Reviewe
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