Second-Order Eikonal Corrections for A(e,e'p)

The first-order eikonal approximation is frequently adopted in interpreting the results of $A(e,e'p)$ measurements. Glauber calculations, for example, typically adopt the first-order eikonal approximation. We present an extension of the relativistic eikonal approach to $A(e,e'p)$ which accounts for second-order eikonal corrections. The numerical calculations are performed within the relativistic optical model eikonal approximation. The nuclear transparency results indicate that the effect of the second-order eikonal corrections is rather modest, even at $Q^{2} \approx 0.2$ (GeV/c)$^2$. The same applies to polarization observables, left-right asymmetries, and differential cross sections at low missing momenta. At high missing momenta, however, the second-order eikonal corrections are significant and bring the calculations in closer agreement with the data and/or the exact results from models adopting partial-wave expansions.Comment: 16 pages, 4 figures, 1 table, submitted to Phys. Lett.

Relativistic eikonal description of A(p,pN) reactions

The authors present a relativistic and cross-section factorized framework for computing quasielastic A(p,pN) observables at intermediate and high energies. The model is based on the eikonal approximation and can accomodate both optical potentials and the Glauber method for dealing with the initial- and final-state interactions (IFSI). At lower nucleon energies, the optical-potential philosophy is preferred, whereas at higher energies the Glauber method is more natural. This versatility in dealing with the IFSI allows one to describe A(p,pN) reactions in a wide energy range. Most results presented here use optical potentials as this approach is argued to be the optimum choice for the kinematics of the experiments considered in the present paper. The properties of the IFSI factor, a function wherein the entire effect of the IFSI is contained, are studied in detail. The predictions of the presented framework are compared with two kinematically different experiments. First, differential cross sections for quasielastic proton scattering at 1 GeV off 12C, 16O, and 40Ca target nuclei are computed and compared to data from PNPI. Second, the formalism is applied to the analysis of a 4He(p,2p) experiment at 250 MeV. The optical-potential calculations are found to be in good agreement with the data from both experiments, showing the reliability of the adopted model in a wide energy range.Comment: 34 pages, 14 figures, accepted for publication in Phys. Rev.

The Unknown, the Unexpected and the Uncanny: A New Lorca, Three New Catalan Productions, and a Few Extras

In depth production reviews of El público (Àlex Rigola, Teatro de la Abadía, 2015) Els veïns de Dalt (Cesc Gay, Teatre Romea, 2015), Panorama desde el pont/A View from the Bridge (George Lavaudant, Teatre Romea, 2016), Infamià (Pere Riera, Teatre Villaroel, 2015), Hotel Paradiso (Familie Flöz, Teatre Lliure, 2016)

Color transparency and short-range correlations in exclusive pion photo- and electroproduction from nuclei

A relativistic and quantum mechanical framework to compute nuclear transparencies for pion photo- and electroproduction reactions is presented. Final-state interactions for the ejected pions and nucleons are implemented in a relativistic eikonal approach. At sufficiently large ejectile energies, a relativistic Glauber model can be adopted. At lower energies, the framework possesses the flexibility to use relativistic optical potentials. The proposed model can account for the color-transparency (CT) phenomenon and short-range correlations (SRC) in the nucleus. Results are presented for kinematics corresponding to completed and planned experiments at Jefferson Lab. The influence of CT and SRC on the nuclear transparency is studied. Both the SRC and CT mechanisms increase the nuclear transparency. The two mechanisms can be clearly separated, though, as they exhibit a completely different dependence on the hard scale parameter. The nucleon and pion transparencies as computed in the relativistic Glauber approach are compared with optical-potential and semi-classical calculations. The similarities in the trends and magnitudes of the nuclear transparencies indicate that they are not subject to strong model dependencies.Comment: 33 pages, 14 figure

Wirksamkeit von Massage auf Schlaf und Schlafstörungen bei Erwachsenen: Systematische Literaturreview

Etwa ein Drittel der Menschen in der allgemeinen Bevölkerung klagen über Insomnie. Auch im Pflegebereich war der Schlaf immer schon ein wichtiges Thema. In der Regel werden Schlafstörungen medikamentös behandelt. Ein erhöhtes Risiko der Toleranzentwicklung und Abhängigkeit besteht. Deshalb sind nichtmedikamentöse Interventionen, wie die Massage geeignet zur Verbesserung des Schlafs. Die Wirksamkeit von Massage auf Schlaf und Schlafstörungen bei Erwachsenen wird in der wissenschaftlichen Literatur nicht ausreichend beschrieben. Der Effekt wird nicht eindeutig als signifikant nachgewiesen. Bisher besteht noch keine deutsche Übersichtsarbeit, welche die Wirksamkeit von Massage auf Schlaf und Schlafstörungen bei erwachsenen Patienten untersucht

Strategic Management and Performance Measurement – A Connected or Disconnected Duo? Evidences from Croatian Public Administration

The paper examines the link between strategic management and performance measurement in the public sector. The main hypothesis is that the stages of strategic management development are positively correlated with the number of performance dimensions measured by public organisations. In order to examine the stated hypothesis results from the empirical research conducted in Croatian public administration are being presented. A questionnaire has been sent to 253 central and local organisations and additional interviews have been conducted. The results confirm the hypothesis and determine that the enhancement of strategic planning and management is one of the main stimuli for performance measurement in Croatia