Isomers close to doubly magic _{28}^{78}Ni_{50} provide essential information on the shell evolution and shape coexistence near the Z=28 and N=50 double shell closure. We report the excitation energy ...measurement of the 1/2^{+} isomer in _{30}^{79}Zn_{49} through independent high-precision mass measurements with the JYFLTRAP double Penning trap and with the ISOLTRAP multi-reflection time-of-flight mass spectrometer. We unambiguously place the 1/2^{+} isomer at 942(10) keV, slightly below the 5/2^{+} state at 983(3) keV. With the use of state-of-the-art shell-model diagonalizations, complemented with discrete nonorthogonal shell-model calculations which are used here for the first time to interpret shape coexistence, we find low-lying deformed intruder states, similar to other N=49 isotones. The 1/2^{+} isomer is interpreted as the bandhead of a low-lying deformed structure akin to a predicted low-lying deformed band in ^{80}Zn, and points to shape coexistence in ^{79,80}Zn similar to the one observed in ^{78}Ni. The results make a strong case for confirming the claim of shape coexistence in this key region of the nuclear chart.
The article describes the commissioning and technical development of the Weak Interaction Studies with 32Ar Decay (WISArD) experiment, installed at the radioactive ion-beam facility ISOLDE/CERN. The ...experiment aims to extend the present limits on scalar and tensor currents in the weak interaction and hence search for physics beyond the Standard Model. The evaluation of these limits relies on measuring the proton energy in beta-delayed proton emission, sensitive to both the beta-neutrino angular correlation coefficient aβν and the Fierz interference term b. The method tries to improve previous studies by considering the positron-proton coincidences when determining the kinematic shift in the energy of the emitted protons. Using this coincidence technique, the aβν and b coefficients will be measured at the per mil level. Simulations were employed to optimize the ion beam transport efficiency and validate proof-of-principle results obtained in November 2018 (Nov2018). Upgrades are ongoing, and we are looking into improvements to the overall performance of the setup.
The use of radioactive molecules for fundamental physics research is a developing interdisciplinary field limited dominantly by their scarce availability. In this work, radioactive molecular ion ...beams containing actinide nuclei extracted from uranium carbide targets are produced via the Isotope Separation On-Line technique at the CERN-ISOLDE facility. Two methods of molecular beam production are studied: extraction of molecular ion beams from the ion source, and formation of molecular ions from the mass-separated ion beam in a gas-filled radio-frequency quadrupole ion trap. Ion currents of U+, UO1−3+, UC1−3+, UF1−4+, UF1,2O1,2+ are reported. Metastable tantalum and uranium fluoride molecular ions are identified. Formation of UO1−3+, U(OH)1−3+, UC1−3+, UF1,2O1,2+ from mass-separated beams of U+, UF1,2+ with residual gas is observed in the ion trap. The effect of trapping time on molecular formation is presented.
Objectives Differences between country-specific guidelines for economic evaluations complicate the execution of international economic evaluations. The aim of this study was to develop cross-European ...recommendations for the identification, measurement and valuation of resource use and lost productivity in economic evaluations using a Delphi procedure. Methods A comprehensive literature search was conducted to identify European guidelines on the execution of economic evaluations or costing studies as part of economic evaluations. Guideline recommendations were extracted by two independent reviewers and formed the basis for the first round of the Delphi study, which was conducted among European health economic experts. During three written rounds, consensus (agreement of 67% or higher) was sought on items concerning the identification, measurement and valuation of costs. Results Recommendations from 18 guidelines were extracted. Consensus among 26 panellists from 17 European countries was reached on 61 of 68 items. The recommendations from the Delphi study are to adopt a societal perspective, to use patient report for measuring resource use and lost productivity, to value both constructs with use of country-specific standardized/ unit costs and to use country-specific discounting rates. Conclusion This study provides consensus-based cross-European recommendations on how to measure and value resource use and lost productivity in economic evaluations. These recommendations are expected to support researchers, healthcare professionals, and policymakers in executing and appraising economic evaluations performed in international contexts.
Highlights ► The fate of nanomaterials in soil is partially controlled by sorption to organic matter. ► Biological degradation of carbon nanomaterials may require abiotic surface activation. ► Solar ...radiation can alter the surface of C60 . ► Nanocomposites will be an important source of nanomaterials in the environment. ► Degradation patterns of nanocomposites are unknown.
Growing environmental concerns, coupled with public pressure and stricter regulations, are fundamentally impacting the way companies design and launch new products across the world. Companies are ...recognising that implementing design for environment (DfE) in their product development process provides opportunities both for improving environmental aspects of a product and for enhancing the product competitiveness. Therefore, integrating environmental and business aspects for decision-making during DfE consideration are crucial in the product design process. The environmental aspect of the product is captured by the lifecycle assessment, and the result is directly introduced to the selection of DfE strategies followed by the multi-criteria decision-making process, in order to integrate business aspects. The proposed method may help the company systematically develop appropriate and profitable design for environment strategies for their product systems.
Beta - neutrino correlation measurements are key in the research of physics beyond the Standard Model. In pure Fermi beta transitions, the beta-neutrino correlation coefficient, aβν, is sensitive to ...the presence of scalar currents. The present limits were established by experimental studies of various nuclear systems with allowed Fermi transitions. A new experiment to improve the constraints on scalar currents is being developed, by the WISArD collaboration at ISOLDE/CERN, where the aim is to measure the energy shift of the β-delayed protons emitted from the isobaric analogue state of the 32Ar ground state. To enhance the sensitivity, protons and positrons are guided by a strong magnetic field and measured in coincidence between the two detection configurations located on both sides of a catcher foil in which the radioactive samples are implanted. Kinematic energy shifts of the protons in coincidence with positrons, in the same or opposite hemisphere of the catcher foil, will be more or less pronounced as a function of the possible scalar current component of the weak interaction. Details of the apparatus and preliminary results of the experiment are presented.
The aim of this study is to further develop a preliminary framework into a model that can translate mechanisms into output and impact, based on the views of those working in practice and the ...relations between the mechanisms: a model that can inform practitioners and organizations on what has to be in place to shape a learning and innovating environment in nursing.
A Learning and Innovation Network (LIN) is a network of healthcare professionals, students and education representatives who come together to be part of a nursing community to integrate education, research and practice to contribute to quality of care. In a previous study a preliminary framework was developed through a concept analysis based on publications. The preliminary framework describes input, throughput and output factors in a linear model that does not explain what the components entail in practice and how the components work together.
Focus groups.
We designed a Theory of Change (ToC) in four phases. This was based on a focus group interview with lecturer practitioners (Phase 1); a first concept ToC based on thematic analysis of the focus group interview (Phase 2); three paired interviews where the ToC was presented to other lecturer practitioners to complement and verify the ToC model (Phase 3); and adjustment of the model based on the feedback of phase 3 (Phase 4).
The developed ToC model describes important preconditions that have to be in place to start a LIN: a shared vision, a facilitating support system and a diversity of participants who are open to change. It describes the mechanisms by which a wide range of activities can lead to an improvement of the quality of care through collaboration between practice, education and research by working, learning, performing practice based research and implementing new methods together.
This study gives a comprehensive overview of the concept of the ‘Learning and Innovation Network’ (LIN); how the activities in the LIN can lead to impact; and under what conditions. Previously published findings supported elements of the ToC model. The overarching ToC model and the detailed appendix offer a theoretical and practice-based model for practitioners, managers and policy makers.
Eugenic Fantasies is an innovative work that combines interpretive strategies from the fields of psychoanalysis, anthropology, and literary studies to create a new model for theorizing race.
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