Introduction Notre établissement a subi deux alertes épidémiques concernant un Entérocoque Résistant aux Glycopeptides (ERG) avec une souche VAN B lors de la première épidémie et une souche VAN A ...lors de la seconde. À cette occasion, une réorganisation de l’ensemble de nos filières de soins a été impérative. Patients et méthodes Nous avons réalisé des audits de pratiques réguliers pour évaluer le décalage entre les recommandations et les pratiques, avec un réajustement permanent nécessaire concernant l’accueil et les flux des patients, tant en consultation au sein du centre de cicatrisation qu’en hospitalisation. En HPDD, nous avons transitoirement créé un espace dédié pour ces patients (unité de cohorting avec une équipe dédiée aux patients porteurs d’ERG) et modifié la planification de la réfection des pansements, gérée en fonction du niveau de risque infectieux et du type de BMR. Nous avons structuré la mise en place de mesures de protection graduées, analysé et amélioré nos pratiques de bionettoyage. Notre consommation de solutions hydroalcooliques est tracée. Une éducation spécifique du patient et de sa famille centrée sur cette problématique a été indispensable, de même qu’une formation spécifique de l’ensemble de l’équipe, tenant compte des représentations des uns et des autres. Observations En consultation, des plages horaires ont été réservées pour ces patients (BMR, ERG suspects et porteurs d’ERG), avec une gestion informatisée tenant compte du risque infectieux avec un signal d’alerte gradué spécifique Conclusion Une organisation des soins prenant en compte le risque infectieux s’est structurée dans notre service de diabétologie du fait de l’accueil de personnes diabétiques présentant des plaies chroniques et de l’émergence de BMR, et dans le cas présent d’ERG. Cette réflexion s’impose tant au niveau de nos unités d’hospitalisation conventionnelle et de jour qu’en consultation. Cette organisation doit tenir compte du niveau de risque prévisible avec mise en place de mesures de protection ajustées dès que le statut du patient est connu, et du type de BMR rencontrée. La prise en charge des plaies impose une collaboration multiprofessionnelle et multidisciplinaire, impliquant également le CLIN, le laboratoire et les équipes opérationnelles d’hygiène.
We report on the single neutron and proton removal reactions from unstable nuclei with large asymmetry ΔS = S(n)-S(p) at incident energies below 80 MeV/nucleon. Strong nonsudden effects are observed ...in the case of deeply-bound-nucleon removal. The corresponding parallel momentum distributions exhibit an abrupt cutoff at high momentum that corresponds to an energy threshold occurring when the incident energy per particle is of comparable magnitude to the nucleon separation energy. A large low-momentum tail is related to both dissipative processes and the dynamics of the nucleon removal process. New limits for the applicability of the sudden and eikonal approximations in nucleon knockout are given.
The strength functions of the πf5/2, πp3/2 and πf7/2 orbitals in neutron-rich 71Cu were obtained in a 72Zn(d,3He)71Cu proton pick-up reaction in inverse kinematics using a radioactive beam of 72Zn at ...38 MeV/u. A dedicated set-up was developed to overcome the experimental challenges posed by the low cross section of the reaction and the low energy of the outgoing 3He particles. The excitation-energy spectrum was reconstructed and spectroscopic factors were obtained after analysis of the angular distributions with the finite-range Distorted-Wave Born Approximation (DWBA). The results show that unlike for the πf5/2 orbital and contrary to earlier interpretation, the πf7/2 single-particle strength distribution is not appreciably affected by the addition of neutrons beyond N=40.
Electric quadrupole matrix elements, Mp, for the Jπ=2+→0+, ΔT=0, T=1 transitions across the A=46 isobaric multiplet 46Cr-46V-46Ti have been measured at GSI with the FRS-LYCCA-AGATA setup. This allows ...direct insight into the isospin purity of the states of interest by testing the linearity of Mp with respect to Tz. Pairs of nuclei in the T=1 triplet were studied using identical reaction mechanisms in order to control systematic errors. The Mp values were obtained with two different methodologies: (i) a relativistic Coulomb excitation experiment was performed for 46Cr and 46Ti; (ii) a “stretched target” technique was adopted here, for the first time, for lifetime measurements in 46V and 46Ti. A constant value of Mp across the triplet has been observed. Shell-model calculations performed within the fp shell fail to reproduce this unexpected trend, pointing towards the need of a wider valence space. This result is confirmed by the good agreement with experimental data achieved with an interaction which allows excitations from the underlying sd shell. A test of the linearity rule for all published data on complete T=1 isospin triplets is presented.
The ^{54}Fe nucleus was populated from a ^{56}Fe beam impinging on a Be target with an energy of E/A=500 MeV. The internal decay via γ-ray emission of the 10^{+} metastable state was observed. As ...the structure of this isomeric state has to involve at least four unpaired nucleons, it cannot be populated in a simple two-neutron removal reaction from the ^{56}Fe ground state. The isomeric state was produced in the low-momentum (-energy) tail of the parallel momentum (energy) distribution of ^{54}Fe, suggesting that it was populated via the decay of the Δ^{0} resonance into a proton. This process allows the population of four-nucleon states, such as the observed isomer. Therefore, it is concluded that the observation of this 10^{+} metastable state in ^{54}Fe is a consequence of the quark structure of the nucleons.
.
Lifetimes of excited states in
107
Tc,
109
Rh,
111
Rh, and
113
Rh were measured at GANIL using the Recoil-Distance Doppler Shift method. The neutron-rich nuclei were produced in fission reactions ...in inverse kinematics with a
238
U beam impinging on a
9
Be target. Fission fragments were identified event-by-event in the ray-tracing spectrometer VAMOS++ and correlated with prompt
γ
rays observed around the target position with the EXOGAM Ge detector array. Several lifetimes were obtained for states in the positive-parity yrast bands in the four nuclei and compared to triaxial particle-rotor calculations. The results clarify the configuration for the strongest positive-parity band in
107
Tc and suggest a gradual increase of triaxial deformation with atomic number
Z
, reaching almost maximum triaxiality for the neutron-rich Rh nuclei.
We report on a new liquid hydrogen and deuterium target dedicated to in-beam γ spectroscopy experiments in inverse kinematics at relativistic incident energies at GSI/FAIR. Target thicknesses from 10 ...to 80mm can be achieved for an effective diameter of 60mm. The target-cell and entrance window are maded of 200μm thick Mylar. The design has the advantage of being free of absorbing material at forward angles and 90°, allowing the detection of photons in a wide angular range. A commissioning experiment with a 54Cr beam at 130MeV/nucleon has been performed at GSI, using the Rare Isotopes INvestigation at GSI (RISING) detectors. The target has been shown to behave as expected and is ready for experiments at fragmentation Radioactive-Ion Beam Facilities.
•We report on a new liquid hydrogen target for gamma spectroscopy experiments at FAIR.•A commissioning experiment has been performed at GSI, using the RISING detectors.•The target behaves as expected and is ready for experiments.
Analysis of the Response of AGATA Detectors at GSI Lalović, N.; Perez-Vidal, R. M.; Louchart, C. ...
CGS15 – Capture Gamma-Ray Spectroscopy and Related Topics,2014-08-25,
01/2015, Letnik:
93
Journal Article, Conference Proceeding
Recenzirano
Odprti dostop
In 2012 and 2014 the γ-ray tracking spectrometer AGATA was operated at the SIS/FRS facility at GSI in Darmstadt, Germany. The performance of the array is discussed, outlining some important aspects ...of the offline data processing and analysis. Relying on the data obtained from measurements with standard γ-ray sources, a first estimate of the photopeak efficiency and peak-to-total (P/T) is presented.
The lifetimes of the first excited 2^{+}, 4^{+}, and 6^{+} states in ^{98}Zr were measured with the recoil-distance Doppler shift method in an experiment performed at GANIL. Excited states in ^{98}Zr ...were populated using the fission reaction between a 6.2 MeV/u ^{238}U beam and a ^{9}Be target. The γ rays were detected with the EXOGAM array in correlation with the fission fragments identified by mass and atomic number in the VAMOS++ spectrometer. Our result shows a very small B(E2;2_{1}^{+}→0_{1}^{+}) value in ^{98}Zr, thereby confirming the very sudden onset of collectivity at N=60. The experimental results are compared to large-scale Monte Carlo shell model and beyond-mean-field calculations. The present results indicate the coexistence of two additional deformed shapes in this nucleus along with the spherical ground state.
PDF
