145 results on '"F, Maréchal"'
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2. Réticence des aidants aux aides extérieures dans l’accompagnement à domicile d’une personne atteinte de maladie d’Alzheimer
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C. Visée, L. Letrilliart, J.M. Talpin, and F. Maréchal
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Psychiatry and Mental health ,Neurology (clinical) ,Geriatrics and Gerontology - Published
- 2023
3. Perception des médecins généralistes des modifications d’ordonnances par les gériatres hospitaliers : une étude qualitative
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E. Favro, E. Bosveil, L. Letrilliart, P. Krolak-Salmon, and F. Maréchal
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Psychiatry and Mental health ,Neurology (clinical) ,Geriatrics and Gerontology - Published
- 2023
4. Continuer à penser le soin en gériatrie : débat sur le « syndrome de glissement »
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F. Maréchal
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Psychiatry and Mental health ,Neurology (clinical) ,Geriatrics and Gerontology - Published
- 2022
5. LINKING INTERACTIVE OPTIMIZATION FOR URBAN PLANNING WITH A SEMANTIC 3D CITY MODEL
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N. Schüler, G. Agugiaro, S. Cajot, and F. Maréchal
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Technology ,Engineering (General). Civil engineering (General) ,TA1-2040 ,Applied optics. Photonics ,TA1501-1820 - Abstract
The cities in which we live are constantly evolving. The active management of this evolution is referred to as urban planning. The according development process could go in many directions resulting in a large number of potential future scenarios of a city. The planning support system URBio adopts interactive optimization to assist urban planners in generating and exploring those various scenarios. As a computer-based system it needs to be able to efficiently handle all underlying data of this exploration process, which includes both methodology-specific and context-specific information. This article describes the work carried out to link URBio with a semantic city model. Therefore, two key requirements were identified and implemented: (a) the extension of the CityGML data model to cope with many scenarios by the proposition of the Scenario Application Domain Extension (ADE) and (b) the definition of a data model for interactive optimization. Classes and features of the developed data models are motivated, depicted and explained. Their usability is demonstrated by walking through a typical workflow of URBio and laying out the induced data flows. The article is concluded with stating further potential applications of both the Scenario ADE and the data model for interactive optimization.
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- 2018
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6. Comparative techno-economic and energy analyses of integrated biorefinery processes of furfural and 5-hydroxymethylfurfural from biomass residue
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K. Wiranarongkorn, K. Im-orb, Y. Patcharavorachot, F. Maréchal, and A. Arpornwichanop
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5-hydroxymethylfurfural ,Renewable Energy, Sustainability and the Environment ,coproduction ,bagasse ,chemicals ,acid ,furfural ,efficient production ,integrated biorefinery processes ,sugarcane bagasse ,optimization ,fructose - Abstract
For efficient feedstock and energy utilization, integrated biorefinery processes are applied to furfural production from bagasse to convert furfural residue into 5-hydroxymethylfurfural (HMF)-an important intermediate building block for the production of various biochemicals. Here, a techno-economic analysis of the integrated processes of furfural and HMF production combined with electricity generation under different scenarios was performed to identify the most suitable process design. Simulations revealed that using the whole bagasse in the biorefinery plant and recycling 50% waste from the HMF production to recover unreacted sugar (scenario 2) achieved the maximum furfural and HMF production with minimum CO2 emission, compared with integrated processes without sugar recycling (scenario 1), with 80% (scenario 3) and 60% biomass (scenario 4) bypassed to the biorefinery, and with a standalone combined heat and power system (scenario 5). Moreover, heat integration improved the efficiency of biorefinery plant (scenario 2), with an energy recovery potential of 71%, leading to the maximum profit at 11% internal rate of return. However, the high operating cost associated with the requirement of solvents and catalysts for HMF production represents the largest cost distribution in the proposed integrated processes. Sensitivity analysis revealed that solvent cost was the most important parameter for economic benefit. In addition, improving technological efficiency in the pretreatment and HMF production phases can enhance product yield, thereby benefiting the profitability of this process.
- Published
- 2023
7. Resilient Decision Making in Steam Network Investments
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S.L. Bungener, G.V. Eetvelde, B. Descales, and F. Maréchal
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Chemical engineering ,TP155-156 ,Computer engineering. Computer hardware ,TK7885-7895 - Abstract
Steam is a key energy vector for industrial sites, used for process heating, direct injection and stripping, tracing and cogeneration of mechanical power. Steam networks transport steam from producers to consumers and across different pressure levels. The steam production equipments (boilers, cogeneration units and heat exchangers) should be dimensioned to always supply key consumers as well as to deal with extreme demand caused by exceptional events such as unit startups or extreme weather. An important issue to be dealt with is that of unexpected boiler shutdowns, which can take significant amounts of time to bring back online. In cases where demand surpasses the available production of steam, load shedding is necessary in order to keep the network operable. A penalty cost can be associated to load shedding. A well dimensioned steam network is one which is resilient to such events, being able to overcome extreme demand and unexpected boiler shutdowns at minimum cost. This paper proposes a methodology for evaluating the operability of a steam network when facing unexpected boiler shutdowns. A Monte-Carlo simulation is carried out on a multi-period steam network problem, randomly shutting down boilers according to their failure properties (probability of failure and duration of failure). The aim of this method is to evaluate how resilient a steam network is to boiler shut- downs. The Monte-Carlo simulation is applied to a steam network model built using a Mixed Integer Linear Programming (MILP) formulation, whose objective function is to minimise the operational costs of the steam network and therefore also to minimise the penalty costs associated to load shedding. A case study based on anonymised industrial data is used to demonstrate the method. Two investment propositions are evaluated and compared using the proposed method.
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- 2015
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8. Integration of Supercritical Water Gasification in Combined 1G/2G Ethanol Production
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A. Mian, J.Q. Albarelli, A.V. Ensinas, and F. Maréchal
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Chemical engineering ,TP155-156 ,Computer engineering. Computer hardware ,TK7885-7895 - Abstract
The present study investigates the potential conversion of sugarcane into ethanol and synthetic natural gas. The considered conversion path consists in combining ethanol first and second generation ethanol production plant with a catalytic supercritical water gasification system. The main steps of the ethanol conversion consider fermentation of sugars (1G) and enzymatic hydrolysis of bagasse (2G). Enzymatic hydrolysis is selected since it represents a promising alternative for 2nd generation biofuels due to its high conversion efficiency. Among streams that are leaving the ethanol production plant are some high watered streams, whose carbon/energy content is not negligible. These streams should be valorised in an efficient way in order to improve the energy conversion efficiency. In this context supercritical gasification process allows to valorise these flows leaving the ethanol plant. Using supercritical water gasification it is in fact possible to avoid the drying the ethanol production leftovers, thus performing a direct gasification. The conversion of ligno-cellulosic residues into synthetic natural gas is modelled considering a catalytic supercritical gasification plant. Since the goal is to achieve high energy and exergy conversion efficiencies, the potential use of an additional set of utilities, such as burners, steam injected gas turbines or steam networks, is added to the sizing problem. The mathematical nature of the optimal utility selection problem deals with mixed integer linear programming (MILP) model, in which the type and size of utilities represent the independent variables, having fixed the process size. The results of the integration are showed in terms of Composite and Grand Composite Curves, economic indicators and local CO2 balance. Finally, having identified the ratio of sugarcane that goes to second generation ethanol plant as key dependent variables, the results of a sensitivity analysis are presented. The sensitivity analysis results are shown accounting economics for the Brazilian market, energy conversion performance indicators and considering local carbon dioxide balance.
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- 2014
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9. Thermo-Economic Optimisation of Integrated Ethanol and Methanol Production in the Sugarcane Industry
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J.Q. Albarelli, S. Onorati, P. Caliandro, E. Peduzzi, F. Maréchal, and A.V. Ensinas
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Chemical engineering ,TP155-156 ,Computer engineering. Computer hardware ,TK7885-7895 - Abstract
The present paper evaluated a sugarcane biorefinery producing ethanol, through the conventional process by sugars fermentation and methanol through bagasse and leaves gasification, hot cleaning and synthesis. The sugarcane biorefinery was modelled using flowsheet modelling software and thermal integration. A thermo-economic model was developed in order to analyze the energy efficiency of the system as well as the total investment. Different configurations are analyzed for the methanol production process. Multi-objective optimization using a genetic algorithm solver is performed, allowing the analysis of several process configurations in terms of conflictive objectives energy efficiency and investment cost. The sugarcane biorefinery is self-sufficient in energy demand after thermal integration with a system energy efficiency increasing when the methanol production is higher, although it also leads to an increase in the total investment. Both Entrained Flow and Circulated Fluidized Bed gasification technologies are modelled and compared for sugarcane residues conversion, showing similar impacts in the system efficiency that can reach more than 55 % (dry biomass input low heating value basis), which is almost two fold higher than the one obtained in the traditional sugarcane ethanol plants currently in use.
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- 2014
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10. Model Predictive Control Strategies for Low-Voltage Microgrids
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R.P. Menon, M. Paolone, and F. Maréchal
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Chemical engineering ,TP155-156 ,Computer engineering. Computer hardware ,TK7885-7895 - Abstract
Modern concepts for grids are being developed owing to the increasing stress put on the electrical producers and the burgeoning need for thermal demands due to varying climate conditions. The increasing awareness of the depletion of natural resources has also been a driver in the direction of modern grids which are more efficient and less susceptible to failures. One solution which is being considered as an alternative for the existing centralised electrical grid and thermal needs is the concept of microgrid. Microgrids are decentralised subunits which consist of different cogeneration units and combined heat and power units along with renewable sources and heat and electricity consumers. Multiple microgrids combine together to aid and complement the existing producers thus, reducing the stress on these producers while increasing the efficiency of the entire electricity grid. The presence of different storage devices and electricity production units mean that the microgrids can also maintain very high quality of electricity, thus reducing losses during transmission and distribution. Another advantage of a microgrid is it's ability of being self-sufficient for a short period time which means that microgrids have the ability to island themselves voluntarily or accidentally from the rest of the electricity grid which could be used to prevent entire grid failures during meteorological problems or when the economic factors are not conducive. The presence of decentralised sources, storage devices and consumers mean that there is a strong need for control of all the different components that constitute a microgrid. There are many different approaches to control a microgrid. This paper attempts to demonstrate a model predictive control (MPC) strategy developed to provide strategies for a low-voltage microgrid with both thermal and electrical devices and requirements. The aim of the strategy is to satisfy the demands and comforts of the consumers while minimising the costs associated by performing a multi-layered mixed-integer optimisation which provides strategy that needs to be employed by each unit of the system. The optimisation consists of two layers, the first of which provides the setpoints for both the thermal and electrical components and the second layer solves a problem which is only takes the electrical units into account and is performed over a shorter timestep. This is owing to the different dynamics of the thermal and electrical units. The fast dynamics of the electrical systems requires us to perform the second layer to maintain the efficiency of the microgrid. The paper then shows the importance of optimal sizing for the model predictive control strategy employed for varying periods of the year and the advantages of this strategy for microgrids over the existing strategies. The paper also attempts to show the impact of certain variables employed in the MPC strategy in particular, for LV (Low-Voltage) microgrid.
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- 2014
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11. Methodology for Identification of Suitable ORC-Cycle and Working-Fluid using Integration with Multiple Objectives
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M. Bendig, D. Favrat, and F. Maréchal
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Chemical engineering ,TP155-156 ,Computer engineering. Computer hardware ,TK7885-7895 - Abstract
In recent times the interest in electricity production with Organic Rankine Cycles (ORC) has increased. A look into recent publications shows that the identification of suitable working fluids is in general done by a look at a more or less small number of fluids and a predefined type of cycle (single-stage, two stage, trans- critical etc.). In this publication we describe a methodology that is capable of choosing the design-point, a suitable working fluid and a type of cycle. This is done while in parallel integrating the cycle with any process, using composite curves and pinch analysis. The methodology proposes a multitude of decision criteria for the optimal cycle which are either thermodynamic criteria like exergy efficiency, energy efficiency, maximum or minimum pressures and temperatures, or economic criteria. Additionally it is possible to include qualitative and quantitative criteria to make a pre-selection e.g. Toxicity, Global Warming Potential (GWP) and Ozone Depletion Potential (ODP). We propose a new methodology, as shown in Figure 1, using a genetic algorithm for the multi objective optimisation (Master-Problem) of suitable ORCs with available heat sources and MILP (Slave-Problem) for fitting of the cycles. The crucial point of this methodology is the choice of the cycle within the MILP-Slave Problem. This means that all possible fluids are tested for a set of thermodynamic parameters and the best one regarding the chosen selection objective is send back to the Master-Problem for evaluation. This has the advantage of testing all fluids within a limited time frame.
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- 2014
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12. Thermo-Economic Modelling and Process Integration of CO2-Mitigation Options on Oil and Gas Platforms
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T.V. Nguyen, L. Tock, P. Breuhaus, F. Maréchal, and B. Elmegaard
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Chemical engineering ,TP155-156 ,Computer engineering. Computer hardware ,TK7885-7895 - Abstract
The offshore extraction of oil and gas is an energy-intensive process associated with large CO2 and CH4 emissions to the atmosphere and chemicals to the sea. The taxation of these emissions has encouraged the development of more energy-efficient and environmental-friendly solutions, of which three are assessed in this paper. The integration of steam bottoming cycles on the gas turbines or of low- temperature power cycles on the export gas compression can result either in an additional power output, or in a greater export of natural gas. Another possibility is to implement a CO2-capture unit, which allows recovering CO2 that can be used for enhanced oil recovery. In this paper, a North Sea platform is considered as case study, and the site-scale retrofit integration of these three options is analysed, considering thermodynamic, economic and environmental performance indicators. The results illustrate the benefits of valorising the waste heat recovered from the exhaust gases, as the total CO2-emissions can be reduced by more than 15 %. Exploiting low-temperature heat seems feasible, although more challenging in retrofit situations. Integrating CO2-capture appears promising with a CO2-avoidance cost between 23 and 29 $/tCO2 for the chosen economic assumptions.
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- 2014
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13. Swiss-EnergyScope.ch: a Platform to Widely Spread Energy Literacy and Aid Decision-Making
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S. Moret, V.C. Gironès, F. Maréchal, and D. Favrat
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Chemical engineering ,TP155-156 ,Computer engineering. Computer hardware ,TK7885-7895 - Abstract
We develop an energy calculator within an online teaching platform to aid citizens and decision-makers understanding an energy system. The model, designed in order to be easily adapted to any energy system at national or regional scale, is presented and applied to the case of Switzerland. Although autonomous on a yearly balance, Switzerland today already relies on foreign imports to face higher electricity demand in winter months. The decision of the country of phasing out nuclear power by 2034 will have as a consequence to further increase this seasonal electricity deficit. The Swiss-EnergyScope.ch project is a contribution to the public debate escalated concerning Switzerland’s future energy strategy, helping citizens to take an active part in it by associating numbers and facts to opinions and choices. The online platform mainly consists of an energy calculator, enabling users to evaluate the effect of a list of possible choices on the energy future of the country. An online wiki and a MOOC will allow users to acquire basic knowledge on energy and to be guided through the learning process and the use of the calculator itself. The robust conceptual design strategy adopted to model the Swiss energy system allows for the contextualization of the key issue of electricity supply within the framework of the overall energy system, conveying a holistic view in which technologies affecting both heat and electricity (such as heat pumping and cogeneration) can be easily integrated. The monthly approach used for the calculation and display of data allows highlighting the central role of seasonal fluctuations in supply and demand. Overall, the designed tool and the associated learning experience allow popularizing energy issues, demystifying the complexity of a national energy system without oversimplifying it.
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- 2014
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14. Environomic Design of Vehicle Integrated Energy System – Application on a Hybrid Electric Vehicle Energy System
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Z. Dimitrova and F. Maréchal
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Chemical engineering ,TP155-156 ,Computer engineering. Computer hardware ,TK7885-7895 - Abstract
With the increasing trend of mobility of the human population, vehicles have to face the problem of primary energy resources scarcity. The vehicles need higher efficiency and better adaptation to the alternative energy sources. The need to improve the efficiency of the vehicle energy system motivates to search for innovative solutions during the design process. The main design criteria for modern sustainable development of vehicle powertrain are the high energy efficiency of the conversion system, the competitive cost and the lowest possible environmental impacts. These objectives are most of the time antagonistic. To cope with this challenge the automotive engineers need a structured optimization methodology. A multi-objective optimization methodology is being applied as search for the best powertrain design solutions. This kind of approach named “multi-objectives optimization” is based on genetic algorithms, which are based on the process of natural selection. An innovative decision- making methodology, using this optimization technic is currently under development at PSA Peugeot Citroën. The idea is to obtain simultaneously a population of possible design solutions corresponding to the most efficient energy system definition for a vehicle. These solutions are optimal from a technical, economic and environmental point of view. In this article the methodology is applied on a hybrid electric vehicle study in order to define the powertrain configuration of the vehicle, estimate the cost of the powertrain equipment and show the environmental impact of the technical choices on the lifecycle perspective of the vehicle. For that a physical model of a hybrid electric vehicle is made. This model is coupled with a cost model for the vehicle and life cycle assessment (LCA) technics are used for the environmental assessment. After multi-objective optimization, the outcoming solutions from the Pareto frontiers curve are analysed.
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- 2014
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15. Methodology for Minimising the Utility Consumption of a 2G Ethanol Process
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R. Bechara, A. Gomez, V. Saint-Antonin, J.Q. Albarelli, A. Ensinas, J.M. Schweitzer, and F. Maréchal
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Chemical engineering ,TP155-156 ,Computer engineering. Computer hardware ,TK7885-7895 - Abstract
The production of ethanol from lignocellulosic biomass has gained increased interest in recent years, notably in the context of valorising agricultural by-products and providing fuels from renewable sources In order to increase their competitiveness, the energy demand of such processes needs to be minimised. This issue procures two benefits : (1) reduce utility consumption and (2) increase cogeneration possibility. In the present article we investigate this problem for a study process: ethanol production from sugarcane bagasse by enzymatic hydrolysis and glucose fermentation. We therefore apply a rigorous optimisation methodology in which we control certain design parameters in order to maximize the net production of utility. As a result, we obtain a design for our process which (1) eliminates the need for an external hot utility, (2) minimizes the need for the cold utility and (3) maximises the cogeneration possibility. As a conclusion, the proposed methodology provides a strong tool for minimising the utility consumption for a 2G ethanol plant. Considering its key components, it can further be applied in the context of a multi-objective problem.
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- 2014
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16. Energy Integration of Large-Scale Industrial Sites with Target-Compatible Sub-System Division Strategy
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N. Pouransari and F. Maréchal
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Chemical engineering ,TP155-156 ,Computer engineering. Computer hardware ,TK7885-7895 - Abstract
This paper presents a targeting strategy to solve the heat load distribution (HLD) problem for large-scale plant by dividing the system into sub-systems while considering the heat transfer opportunities between them. The methodology is based on a sequential approach. The optimal flow rates of utilities are first defined using a Mixed Integer Linear Programming (MILP) model. The site is then divided into the sub- systems where the overall interaction is resumed into a pair of virtual hot and cold stream with nonlinear T- H profile. The HLD problem is solved between these subsystems in a sequential procedure by considering a MILP model between these virtual representative streams, while each time one of the sub-systems is switched from virtual streams to the real ones. The main advantages are to reduce the size of the HLD problem and to find a feasible solution which is compatible with the minimum energy requirement (MER) objective. The potential of direct heat recovery between sub-systems are considered and the method can be practically adopted to consider the restricted matches between sub-systems as well. This methodology has been currently applied on a real site scale process integration industrial example and in this paper its application is illustrated through a case study with 23 streams.
- Published
- 2014
- Full Text
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17. Optimal Predictive Control Strategies for Polygeneration Systems
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R.P. Menon and F. Maréchal
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Chemical engineering ,TP155-156 ,Computer engineering. Computer hardware ,TK7885-7895 - Abstract
The optimal energy control and management for smart grids as per virtual power plant concepts is of great importance for the coming future of the electricity grid and the energy market. The optimal energy management for housing applications necessitates the combined use of heat and electricity by the way of technologies like cogeneration engines, heat pumps and thermal storage which can be used to dephase the electricity and heat demand of the building of the district concerned. A major factor that will play a role in the effective usage of these technologies is the proper and optimal sizing of each of the conversion and storage units as per the demands of the occupants. Another factor, that may affect the optimal energy management of domestic applications is the pricing of electricity done through the energy exchanges around Europe. Energy management is especially important for Switzerland as it is seen as a major transit and exchange country in the European energy market owing to its position and the trade of energy between France, Germany, Italy and itself. Here, a study has been conducted that tries to link two of the above mentioned factors in the design of a polygeneration system design. This study aims to show the effect of implementation of cogeneration system (cogeneration engine with or without a back-up boiler) coupled with a heat pump to satisfy the needs of a building considering the use of an optimal predictive control strategy that is used to optimize the use of the storage tanks. The study aims to identify the differences in the demand with and without heat pump. Also, the study aims to show the potential for thermal/electric storage in a single family house for better management of demand from the grid. The effect of the implementation of thermal storage with cogeneration engine coupled with heat pump on the grid electricity is explored. The effect of change in the electricity prices and as well as of constraints imposed on the electricity variations through the day on the buildiing requirements with cogeneration engine coupled with heat pump and thermal storage over a day is studied and the different strategies are identified. The study is then extended to include different buildings with different energy demand profiles. The objective is to study any possible changes in the strategy of one building due to the presence of another building in the grid which can also buy and sell using the control strategies mentioned above. As a result, this also reveals the effect of the use of optimal control of multiple buildings connected to a micro grid on the sale or purchase of electricity from or to grid as well.
- Published
- 2012
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18. Analyzing powers and the role of multistep processes in the C12(Li7,t)O16 reaction
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D. Robson, Konstantinos Kravvaris, Alexander Volya, W. D. Weintraub, B. T. Roeder, K. W. Kemper, K. Rusek, N. Keeley, and F. Maréchal
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Physics ,Amplitude ,010308 nuclear & particles physics ,0103 physical sciences ,SHELL model ,Zero (complex analysis) ,Observable ,Sensitivity (control systems) ,Atomic physics ,Born approximation ,010306 general physics ,Space (mathematics) ,01 natural sciences - Abstract
The analyzing powers $^{T}T_{10}\phantom{\rule{0.16em}{0ex}},^{T}T_{20}$, and $^{T}T_{30}$ for the $^{12}\mathrm{C}(^{7}\mathrm{Li},t$) reaction were measured and combined with new and previously determined angular distributions to probe the role of multistep processes through coupled channel Born approximation (CCBA) calculations employing new $\ensuremath{\alpha}$-particle spectroscopic amplitudes calculated with the phenomenological shell model in the unrestricted $psd$ space. Good descriptions of the cross-section angular distributions could be obtained except for the larger angles for the 6.05 MeV ${0}^{+}$ and 6.13 MeV ${3}^{\ensuremath{-}}$ states, while the analyzing powers were not generally described. The calculations presented demonstrate the sensitivity of the angular distributions of both the differential cross sections and the analyzing powers to various multistep routes. While the measured analyzing power $^{T}T_{30}$ is roughly zero for all states, the various CCBA calculations produced large and highly oscillatory values for this observable, showing that other multistep processes must be present beyond those taken into account in this work. Standard distorted wave Born approximation (DWBA) calculations were also carried out and these show considerable differences from the CCBA results but the description of the analyzing powers, while slightly improved, is still poor.
- Published
- 2019
19. Évaluation de la ligne unique et directe d’appel teléphonique en gériatrie (ELUDAT G) : une étude qualitative
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E. Castel-Kremer, B. Comte, B.-A. Kim, and F. Maréchal
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Psychiatry and Mental health ,Neurology (clinical) ,Geriatrics and Gerontology - Abstract
Resume Le service de geriatrie de l’hopital Edouard-Herriot a Lyon a mis en place une ligne d’appel directe pour les medecins non hospitaliers. L’objectif etait d’identifier les attentes et perceptions des medecins non hospitaliers de cette ligne d’appel directe. Nous avons realise une enquete qualitative aupres de 20 medecins. Les medecins interroges n’arrivaient pas a faire acceder leur patient et leur demande d’avis au milieu hospitalier. Un gain de temps etait percu par les medecins utilisant ce dispositif. L’acces a l’hospitalisation et a l’avis specialise est facilite par une ligne d’appel directe dans un service de geriatrie. Ceci a permis d’eviter aux patients une hospitalisation dans certaines situations.
- Published
- 2015
20. Dispersal capacity of Haematopota spp. and Stomoxys calcitrans using a mark-release-recapture approach in Belgium
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L, Lempereur, C, Sohier, F, Smeets, F, Maréchal, D, Berkvens, M, Madder, F, Francis, and B, Losson
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Belgium ,Diptera ,Muscidae ,Animals ,Cattle ,Horses ,Animal Husbandry ,Animal Distribution ,Insect Control ,Insect Vectors - Abstract
The dispersion potential of mechanical vectors is an important factor in the dissemination of pathogens. A mark-release-recapture experiment was implemented using two groups (unfed and partially fed) of the Tabanidae (Diptera) (Haematopota spp.) and biting Muscidae (Diptera) (Stomoxys calcitrans) most frequently collected in Belgium in order to evaluate their dispersion potential. In total, 2104 specimens of Haematopota spp. were collected directly from horses and 5396 S. calcitrans were collected in a cattle farm using hand-nets. Some of these insects were partially fed in vitro and all were subsequently coloured. Overall, 67 specimens of S. calcitrans (1.2%) and 17 of Haematopota spp. (0.8%) were recaptured directly on horses. Stomoxys calcitrans flew maximum distances of 150 m and 300 m when partially fed and unfed, respectively. Haematopota spp. travelled maximum distances of 100 m and 200 m when partially fed and unfed, respectively. Segregation measures seem essential in order to reduce the risk for pathogen transmission. A distance of 150 m appears to be the minimum required for segregation to avoid the risk for mechanical transmission, but in areas of higher vector density, this should probably be increased.
- Published
- 2017
21. Spectroscopy of Fe61 via the neutron transfer reaction H2(Fe60,p)Fe*61
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S. Giron, F. Hammache, N. de Séréville, P. Roussel, J. Burgunder, M. Moukaddam, D. Beaumel, L. Caceres, G. Duchêne, E. Clément, B. Fernandez-Dominguez, F. Flavigny, G. de France, S. Franchoo, D. Galaviz-Redondo, L. Gasques, J. Gibelin, A. Gillibert, S. Grevy, J. Guillot, M. Heil, J. Kiener, V. Lapoux, F. Maréchal, A. Matta, I. Matea, L. Nalpas, J. Pancin, L. Perrot, A. Obertelli, R. Raabe, J. A. Scarpaci, K. Sieja, O. Sorlin, I. Stefan, C. Stodel, M. Takechi, J. C. Thomas, and Y. Togano
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Physics ,Photon ,Silicon ,010308 nuclear & particles physics ,chemistry.chemical_element ,01 natural sciences ,7. Clean energy ,Charged particle ,Cross section (physics) ,chemistry ,0103 physical sciences ,Bound state ,Neutron ,Atomic physics ,010306 general physics ,Adiabatic process ,Spectroscopy - Abstract
The direct component of the 60Fe(n,γ)61Fe cross section was investigated by populating the bound states of the 61Fe nucleus through the (d,pγ) transfer reaction in inverse kinematics using a radioactive beam of 60Fe at 27A MeV. The experiment was performed at GANIL using the MUST2 array and an annular double-sided silicon strip detector for the detection of the light charged particle in coincidence with the photons measured in the EXOGAM γ-ray detectors. For the first time, the spectroscopic factors of the first 3/2−, 5/2−, 1/2−, and 9/2+ states of 61Fe were deduced experimentally from an adiabatic distorted wave approximation analysis of the data. The obtained results show a very good agreement with the shell-model predictions. The calculated direct component of the (n,γ) cross section was found negligible and of about 2% of the total, indicating a dominant resonant component.
- Published
- 2017
22. High-sensitivity study of levels in Al30 following β decay of Mg30
- Author
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T. Kröll, R. Boutami, A. Korgul, Ulli Köster, C. Jollet, Thomas Nilsson, F. Maréchal, Olof Tengblad, Henryk Mach, W. Schwerdtfeger, H. O. U. Fynbo, J. Benito, Henrik B. Jeppesen, E. Ruchowska, W. Kurcewicz, P. G. Thirolf, J. Mrazek, L. M. Fraile, M. Stanoiu, G. S. Simpson, P. A. Butler, Z. Dlouhy, P. Hoff, W. Plociennik, Ari Jokinen, B. Olaizola, M. Sewtz, R. Schuber, Deyan Yordanov, S. Hyldegaard, and M. J. G. Borge
- Subjects
Physics ,010308 nuclear & particles physics ,01 natural sciences ,Beta decay ,Gamma gamma ,Excited state ,0103 physical sciences ,Neutron ,Atomic physics ,010306 general physics ,Beta (finance) ,Spectroscopy ,Sensitivity (electronics) ,Excitation - Abstract
gamma-ray and fast-timing spectroscopy were used to study levels in Al-30 populated following the beta(-) decay of Mg-30. Five new transitions and three new levels were located in Al-30. A search was made to identify the third 1(+) state expected at an excitation energy of similar to 2.5 MeV. Two new levels were found, at 3163.9 and 3362.5 keV, that are firm candidates for this state. Using the advanced time-delayed (ATD) beta gamma gamma (t) method we have measured the lifetime of the 243.8-keV state to be T-1/2 = 15(4) ps, which implies that the 243.8-keV transition is mainly of M1 character. Its fast B(M1; 2(+) -> 3(+)) value of 0.10(3) W.u. is in very good agreement with the USD shell-model prediction of 0.090 W.u. The 1801.5-keV level is the only level observed in this study that could be a candidate for the second excited 2(+) state.
- Published
- 2016
23. Second0+state of unboundO12: Scaling of mirror asymmetry
- Author
-
F. Naqvi, V. Lapoux, Y. Blumenfeld, N. de Sereville, H. Okamura, A. Matta, Satoru Terashima, A. Drouart, Dan-Yang Pang, O. Sorlin, I. Stefan, Hiroyoshi Sakurai, M. Assié, M. Hackstein, J. Guillot, S. Giron, P. C. Srivastava, A. Ramus, S. Franchoo, H. Baba, Julien Gibelin, F. de Oliveira Santos, L. Perrot, C. M. Petrache, Shin'ichiro Michimasa, N. Keeley, A. Gillibert, Y. Tanimura, D. Suzuki, J. A. Scarpaci, C. Stodel, F. Maréchal, J. Pancin, H. Iwasaki, Hideaki Otsu, L. Nalpas, P. Roussel-Chomaz, E. C. Pollacco, Didier Beaumel, W. Rother, S. Grévy, and F. Hammache
- Subjects
Physics ,010308 nuclear & particles physics ,media_common.quotation_subject ,Binding energy ,Parity (physics) ,01 natural sciences ,7. Clean energy ,Asymmetry ,0103 physical sciences ,Nuclear drip line ,Atomic physics ,Born approximation ,Nuclear Experiment ,010306 general physics ,Mirror symmetry ,Scaling ,Excitation ,media_common - Abstract
The unbound O12 nucleus was studied via the two-neutron transfer (p,t) reaction in inverse kinematics using a radioactive O14 beam at 51 MeV/u. Excitation energy spectra and differential cross sections were deduced by the missing mass method using MUST2 telescopes. We achieved much higher statistics compared to the previous experiments of O12, which allowed accurate determination of resonance energy and unambiguous spin and parity assignment. The O12 resonance previously reported using the same reaction was confirmed at an excitation energy of 1.62±0.03(stat.)±0.10(syst.). MeV and assigned spin and parity of 0+ from a distorted-wave Born approximation analysis of the differential cross sections. Mirror symmetry of O12 with respect to its neutron-rich partner Be12 is discussed from the energy difference of the second 0+ states. In addition, from systematics of known 0+ states, a distinct correlation is revealed between the mirror energy difference and the binding energy after carrying out a scaling with the mass and the charge. We show that the mirror energy difference of the observed 0+ state of O12 is highly deviated from the systematic trend of deeply bound nuclei and in line with the scaling relation found for weakly bound nuclei with a substantial 2s1/2 component. The importance of the scaling of mirror asymmetry is discussed in the context of ab initio calculations near the drip lines and universality of few-body quantum systems.
- Published
- 2016
24. NEUTRON CORRELATIONS IN 6<font>He</font> VIEWED THROUGH NUCLEAR BREAK-UP
- Author
-
Denis Lacroix, M. Chabot, C. Monrozeau, J. C. Angélique, M. Assié, C. M. Petrache, A. Chatterjee, H. Iwasaki, J. A. Scarpaci, W. N. Catford, Muriel Fallot, T. Tuna, F. Maréchal, F. Skaza, Y. Blumenfeld, D. Beaumel, D. Bazin, and Johan Nyberg
- Subjects
Physics ,Nuclear reaction ,Nuclear and High Energy Physics ,Break-Up ,010308 nuclear & particles physics ,General Physics and Astronomy ,Astronomy and Astrophysics ,01 natural sciences ,Nuclear physics ,Correlation function (statistical mechanics) ,Mean field theory ,0103 physical sciences ,Neutron ,Nuclear drip line ,Atomic physics ,010306 general physics ,Nucleon ,Beam (structure) - Abstract
Nuclear break-up as a tool to study neutron correlations is investigated both theoretically and experimentally. First a time dependent theory going beyond mean field has been developed and shows that correlations between nucleons can be probed through nuclear break-up. Secondly, nuclear break-up of 6 He on 208 Pb target was studied at 20 A.MeV using a secondary beam of 6 He produced by the SPIRAL facility at GANIL. From the correlation function, a strong contribution of the di-neutron configuration of 6 He is found.
- Published
- 2010
25. Measurement of the GMR in the Unstable 56Ni Nucleus using the Active Target Maya
- Author
-
U. Garg, A. Gillibert, N. Frascaria, M. Gelin, M. Caamaño, D. Beaumel, D. Cortina-Gil, D. Gupta, A. Obertelli, J. A. Scarpaci, C. Monrozeau, W. Mittig, Y. Blumenfeld, P. Roussel-Chomaz, F. Maréchal, Elias Khan, C. E. Demonchy, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
- Subjects
Active target ,Physics ,Nuclear and High Energy Physics ,010308 nuclear & particles physics ,Isoscalar ,Nuclear Theory ,Magnetic monopole ,Resonance ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Inelastic scattering ,01 natural sciences ,Nuclear physics ,medicine.anatomical_structure ,0103 physical sciences ,Energy spectrum ,medicine ,Atomic physics ,Nuclear Experiment ,010303 astronomy & astrophysics ,Nucleus ,Excitation - Abstract
The measurement of the Isoscalar Giant Monopole Resonance(GMR) in unstable nuclei remains a major experimental challenge due to low radioactive beam intensities and unfavourable conditions in reverse kinematics. At GANIL, we have tested a new experimental method based on the unique capabilities of the active target Maya to probe the GMR by the inelastic scattering reaction 56Ni(d,d') at 50 AMeV. The preliminary excitation energy spectrum of 56Ni presents a bump between 12 and 25 MeV where isoscalar resonances are expected. © 2007 Elsevier B.V. All rights reserved.
- Published
- 2007
26. Shape study of theN=ZnucleusKr72viaβdecay
- Author
-
S. Courtin, María José García Borge, F. Maréchal, E. Poirier, A. Maira-Vidal, Ph. Dessagne, José Antonio Briz, Ch. Miehé, G. Le Scornet, Daniel Cano Ott, Berta Rubio, Alfredo Poves, Olof Tengblad, Enrique Nácher, D. Escrig, L. M. Fraile, A. Jungclaus, W. Gelletly, J. L. Tain, Pedro Sarriguren, and Alejandro Algora
- Subjects
Physics ,Nuclear physics ,Nuclear and High Energy Physics ,medicine.anatomical_structure ,010308 nuclear & particles physics ,0103 physical sciences ,medicine ,Creative commons ,010306 general physics ,01 natural sciences ,Nucleus ,Beta decay - Abstract
10 pags.; 11 figs.; 2 tabs.; PACS number(s): 23.40.Hc, 29.30.Kv, 27.50.+e, 21.10.Pc; Open Access funded by Creative Commons Atribution Licence 3.0
- Published
- 2015
27. Total Absorption Spectroscopy of the N=Z Nucleus 72Kr
- Author
-
A. Jungclaus, G. Le Scornet, Olof Tengblad, L. M. Fraile, Ph. Dessagne, J. L. Tain, Enrique Nácher, F. Maréchal, José Antonio Briz, W. Gelletly, E. Poirier, S. Courtin, Ch. Miehé, B. Rubio, A. Algora, D. Cano-Ott, D. Escrig, and M. J. G. Borge
- Subjects
Physics ,medicine.anatomical_structure ,Total absorption spectroscopy ,medicine ,Analytical chemistry ,Nucleus - Published
- 2015
28. Target structure independent Li→7 elastic scattering at low momentum transfers
- Author
-
A. M. Crisp, F. Maréchal, O.A. Momotyuk, B.G. Schmidt, K. W. Kemper, W. T. Cluff, K. Rusek, B. T. Roeder, N. Keeley, S.Yu. Mezhevych, M. Wiedeking, and J. A. Liendo
- Subjects
Physics ,Elastic scattering ,Coupling ,Nuclear and High Energy Physics ,Work (thermodynamics) ,010308 nuclear & particles physics ,Projectile ,Momentum transfer ,01 natural sciences ,Momentum ,Excited state ,0103 physical sciences ,Atomic physics ,010306 general physics ,Ground state - Abstract
Analyzing powers and cross sections for the elastic scattering of polarized 7 Li by targets of 6 Li, 7 Li and 12 C are shown to depend only on the properties of the projectile for momentum transfers of less than 1.0 fm −1 . The result of a detailed analysis of the experimental data within the framework of the coupled channels model with ground state reorientation and transitions to the excited states of the projectile and targets included in the coupling schemes are presented. This work suggests that nuclear properties of weakly-bound nuclei can be tested by elastic scattering experiments, independent of the target used, if data are acquired for momentum transfers less than ∼ 1.0 fm −1 .
- Published
- 2006
29. New structure information on 30Mg, 31Mg and 32Mg
- Author
-
P. Hoff, Ulli Köster, Birger Fogelberg, M. Stanoiu, F. Maréchal, Ph. Dessagne, T. Motobayashi, Thomas Nilsson, Alfredo Poves, J. Mrazek, C. Jollet, P. A. Butler, Henryk Mach, Deyan Yordanov, L. M. Fraile, E. Ruchowska, W. Kurcewicz, Joakim Cederkäll, María José García Borge, H. O. U. Fynbo, A. Korgul, Olof Tengblad, S.G. Pedersen, Ari Jokinen, Gerda Neyens, W. Plociennik, R. Boutami, Berta Rubio, Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), C. Gross, W. Nazarewicz, K. P. Rykaczewski, and ISOLDE
- Subjects
Triple coincidence ,Physics ,Nuclear and High Energy Physics ,010308 nuclear & particles physics ,Neutron emission ,Hadron ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,01 natural sciences ,Gamma gamma ,Nuclear physics ,0103 physical sciences ,21.10.Tg - 23.20.Lv - 27.30.+t ,Nuclear fusion ,010306 general physics ,Ground state - Abstract
NESTER; The fast timing $\beta\gamma\gamma(t)$ method was applied to investigate the level lifetimes in $^{30,31,32}$Mg. Levels in Mg have been populated in $\beta$ and $\beta$-delayed neutron emission of Na at the ISOLDE facility. From the $\gamma\gamma$ coincidences a number of new states have been identified and new level schemes were constructed for $^{30,31,32}$Mg. The following preliminary half lives have been determined: T$_{1/2}$ = 3.9(4) ns for the 1789 keV state in $^{30}Mg, T$_{1/2}$ = 133(8) ps and 10.5(8) ns for the 221 keV and 461 keV states in $^{31}$Mg, respectively, and T$_{1/2}$ = 16(4) ps for the 885 keV level in $^{32}$Mg. The 1789 keV level was established as a candidate for the intruder 0$^+$ configuration in $^{30}$Mg with a possible strong E0 branch to the ground state.
- Published
- 2005
30. Beta-decay studies using total absorption spectroscopy
- Author
-
Enrique Nácher, R. Collatz, D. Cano-Ott, Z. Janas, W. Gelletly, B. Rubio, A. Jungclaus, Margareta Hellström, K. Rykaczewski, A. Algora, F. Moroz, Ph. Dessagne, Ch. Miehé, F. Maréchal, A. Gadea, R. Kirchner, V. Wittmann, L. M. Fraile, L. Batist, S. Courtin, Olof Tengblad, G. Le Scornet, J. L. Tain, E. Poirier, E. Roeckl, M. J. G. Borge, and M. Karny
- Subjects
Physics ,Nuclear and High Energy Physics ,[PACS] Beta decay ,Absorption spectroscopy ,Total absorption spectroscopy ,Spectrometer ,Hadron ,double beta decay ,Pandemonium effect ,electron and muon capture ,Nuclear physics ,Double beta decay ,Atomic physics ,Nuclear Experiment ,Spectroscopy ,Absorption (electromagnetic radiation) - Abstract
4 pages, 3 figures.-- PACS nr.: 23.40.-s.-- Printed version published Apr 2004.-- et al., Beta-decay experiments are a primary source of information for nuclear-structure studies and at the same time complementary to in-beam investigations of nuclei far from stability. Although both types of experiment are mainly based on γ-ray spectroscopy, they face different experimental problems. The so-called Pandemonium effect is a critical problem in β-decay if we are to test theoretically calculated transition probabilities. In this contribution we will present a solution to this problem using total absorption spectroscopy methods. We will also present some examples of experiments carried out with the Total Absorption Spectrometer (TAS) at GSI an describe a new device LUCRECIA recently installed at CERN., This work was partially supported by C.I.C.Y.T. (Spain) under contract AEN96-1662, by MCYT (Spain)contract No. FPA2002-04181-C04-03, by C.S.R. (Poland) grant KBN-2Pp03B-039-13, by R.F.B.R. (Russia)-D.F.G. (Germany) contract 436 RUS 113/201/0(R). Support from the HPMF-CT-1999-00394 project as well as from the European Large Scale Facility program at CERN is also aknowledged.
- Published
- 2003
31. Circulating autoantibodies in unselected children with new-onset seizures
- Author
-
C.M. Korff, A.N. Datta, G. Ramelli, F. Maréchal-Rouiller, C.G. Bien, and S. Garcia-Tarodo
- Subjects
Pediatrics, Perinatology and Child Health ,Neurology (clinical) ,General Medicine - Published
- 2017
32. Investigation of triaxiality in 10Be using the 7Li(7Li, 4He 6He)4He reaction
- Author
-
F. Maréchal, D. Robson, N.R. Fletcher, N. Fay, D. Shorb, J. A. Liendo, D. D. Caussyn, and N. Curtis
- Subjects
Nuclear physics ,Physics ,Nuclear and High Energy Physics - Published
- 2001
33. Secondary standards for 7Li beam polarimetry
- Author
-
B.G. Schmidt, E. E. Bartosz, P. D. Cathers, F. Maréchal, Edmund G. Myers, K. W. Kemper, and P. V. Green
- Subjects
Physics ,Nuclear and High Energy Physics ,Beamline ,Polarimetry ,Tensor ,Atomic physics ,Orbit (control theory) ,Polarization (waves) ,Spin (physics) ,Instrumentation ,Beam (structure) ,Sign (mathematics) - Abstract
Primary standards for 7Li polarimetry requiring a measurement of the reaction p(7Lio,a)at03 to the beamline imposeexcessiveradiationdamageonthedetectors.Eliminatingthisdamagerequirestheestablishmentofsecondarystandardsfortheonlinemeasurementofbeampolarization.Acompletesetofanalyzingpowershasbeenobtainedforthescatteringofpolarized7Liby4Hetothe4.63MeVexcitedstateof7Liatabombardingenergyof31.5MeV.Certainanglesatwhichboth the di!erential cross-sections and analyzing powers are large are tabulated as secondary polarization stan-dards. ( 2001 Elsevier Science B.V. All rights reserved. Keywords: Polarized 7Li polarimetry 1. IntroductionEstablishing the magnitude and sign of a beam’spolarizationis now largelyroutinedue tothe greate!ort that has gone into establishing primary po-larization standards for beams of spin 12,1or32nuclei. For heavy-ion beams of spin 32nuclei, thepioneering experimental work of the Heidel-berg}Marburg group showed that angular mo-mentum conservation rules allow a beam tensorpolarization to be determined from measurementsat03or1803[1}3].Theirexperimentswithpolariz-ed7Liand23Nabeamsshowedmanynovelphysicse!ects. Perhaps one of the most startling was thatvirtual projectile excitations can lead to large ana-lyzing powers even when the spin}orbit force issmall [4,5]. Recent experimental work on under-standing the structure of loosely boundhalo nuclei[6] has rekindled interest in studies involving thestable but loosely bound nuclei 6,7Li.All 7Li beam standards are currently based onthe fact that for the p(7Lio,a)a reaction induced bya tensor polarized beam, the tensor analyzingpowers are „20"!1 and
- Published
- 2001
34. Observation of peripheral localization in polarized nuclear reactions
- Author
-
F. Maréchal, P. D. Cathers, K. W. Kemper, E. E. Bartosz, K. Rusek, G. Grawert, and D. Robson
- Subjects
Physics ,Nuclear reaction ,Nuclear and High Energy Physics ,Plane (geometry) ,Rank (graph theory) ,Atomic physics - Abstract
The odd rank analyzing powers T T 10 and T T 30 for 12 C( 7 Li → , 7 Li) 12 C and 12 C( 7 Li → , α ) 15 N have been measured with high precision for a 7 Li → bombarding energy of 34 MeV. The angular distributions of the T T 10 and T T 30 data are strongly correlated, marking the first experimental evidence of a relationship between analyzing powers of different rank. The ratio of T T 30 to T T 10 obeys limits derived from the assumptions that the reaction is both peripheral and well localized in the reaction plane, allowing, for the first time, a third rank analyzing power to contribute to our understanding of 7 Li.
- Published
- 2000
35. Inverse Kinematics Proton Scattering onN18eand Mirror Symmetry inA=18Nuclei
- Author
-
F. Maréchal, J. A. Carr, L. A. Riley, N. Alamanos, R. W. Ibbotson, K. W. Kemper, M. Chromik, T. Glasmacher, F. Petrovich, J. K. Jewell, Heiko Scheit, Y. Blumenfeld, P. D. Cottle, W. E. Ormand, and T. Suomijärvi
- Subjects
Physics ,Inverse kinematics ,Quantum electrodynamics ,Proton scattering ,General Physics and Astronomy ,Scattering theory ,Inelastic scattering ,Mirror symmetry - Published
- 1999
36. Proton scattering on the radioactive nucleus O and the 0gs+→21+ transition in the neutron-rich oxygen isotopes
- Author
-
T. Glasmacher, S. E. Hirzebruch, K. W. Kemper, R. W. Ibbotson, Y. Blumenfeld, Heiko Scheit, M. Chromik, P. D. Cottle, J. K. Jewell, T. Suomijärvi, L. A. Riley, and F. Maréchal
- Subjects
Physics ,Nuclear and High Energy Physics ,Valence (chemistry) ,Proton ,Isoscalar ,Nuclear Theory ,Isotopes of oxygen ,medicine.anatomical_structure ,medicine ,Neutron ,Atomic physics ,Nuclear Experiment ,Multipole expansion ,Open shell ,Nucleus - Abstract
Elastic and inelastic proton scattering to the 21+ state of the single closed shell radioactive nucleus 20 O have been measured in inverse kinematics with a beam energy of 30 MeV/u. The matrix element determined for the 0gs+→21+ transition in this work is compared with the corresponding electromagnetic matrix element to determine the ratio of the neutron and proton multipole matrix elements for this transition, Mn/Mp=2.9(4), which is quite different from the value Mn/Mp=N/Z=1.5 that would be expected for a purely isoscalar transition. A comparison of this result to a corresponding result for 18 O suggests that the strength of the core polarizing interactions between the valence neutrons and the core protons and neutrons is changing significantly with mass.
- Published
- 1999
37. A new phenomenon in heavy ion inelastic scattering: the towing mode
- Author
-
J.A. Scarpaci, A. van der Woude, N. Frascaria, T. Suomijärvi, J.C. Roynette, F. Maréchal, D. Beaumel, Ph. Chomaz, V. Pascalon-Rozier, I. Lhenry, J.R. Jongman, Y. Blumenfeld, H. Laurent, Denis Lacroix, P. Roussel-Chomaz, Research unit Nuclear & Hadron Physics, Institut de Physique Nucléaire d'Orsay (IPNO), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Physique théorique, Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
- Subjects
Physics ,Nuclear and High Energy Physics ,010308 nuclear & particles physics ,Nuclear Theory ,Mode (statistics) ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Inelastic scattering ,Deep inelastic scattering ,01 natural sciences ,Inelastic neutron scattering ,Spectral line ,Coincidence ,Nuclear physics ,0103 physical sciences ,SPECTRA ,Atomic physics ,010306 general physics ,Nucleon ,DECAY ,Excitation - Abstract
The inelastic scattering of Ar-40 on Ni-58 has been studied at 44 MeV per nucleon incident energy in coincidence with light particle emission. Besides the well known mechanisms of inelastic excitation, pick up break up and nucleon knock out, a new phenomenon has been observed, giving rise to fast forward moving particles with specific angular correlations. This newly observed mechanism seems to be a generic phenomenon present for various projectile-target combinations and incident energies. Its contribution to the inelastic spectrum has been extracted and a tentative interpretation is given. (C) 1998 Elsevier Science B.V. All rights reserved.
- Published
- 1998
38. Inelastic proton scattering on Neutron-Rich sulphur isotopes
- Author
-
P. Thirolf, S. Danczyk, S. E. Hirzebruch, J.A. Scarpaci, J. H. Kelley, D. J. Morrissey, J. A. Brown, T. Suomijärvi, J. K. Jewell, A. Azhari, P. D. Cottle, K. W. Kemper, Y. Blumenfeld, S. Ottini, Michael Fauerbach, D. Bazin, T. Glasmacher, and F. Maréchal
- Subjects
Physics ,Nuclear and High Energy Physics ,Isotope ,Nuclear Theory ,Hadron ,General Physics and Astronomy ,chemistry.chemical_element ,Coulomb excitation ,Sulfur ,chemistry ,Neutron ,Atomic physics ,Nuclear Experiment ,Nucleon ,Beam (structure) ,Excitation - Abstract
The proton scattering on unstable38S nuclei has been measured in inverse kinematics by using a38S secondary beam at 39 MeV/nucleon. The first 2+ state is seen at 1.2 MeV excitation energy and its angular distribution is extracted. Optical and folding model calculations are compared with the elastic and the 2 1 + angular distributions and the β2 value is determined to be 0.35±0.04. This value is compared with the corresponding result from a Coulomb excitation measurement and theM n/Mp value is extracted.
- Published
- 1997
39. Proton scattering on the unstable38Snucleus: Isovector contribution to the21+state
- Author
-
J. H. Kelley, S. Danczyk, S. Ottini, T. Suomijärvi, J. A. Scarpaci, A. Azhari, P. D. Cottle, F. Maréchal, K. W. Kemper, D. J. Morrissey, D. Bazin, Michael Fauerbach, T. Glasmacher, Y. Blumenfeld, J. A. Brown, P. G. Thirolf, S. E. Hirzebruch, and J. K. Jewell
- Subjects
Physics ,Elastic scattering ,Nuclear and High Energy Physics ,Distribution (mathematics) ,medicine.anatomical_structure ,Isovector ,medicine ,State (functional analysis) ,Coulomb excitation ,Inelastic scattering ,Atomic physics ,Nucleus ,Measure (mathematics) - Abstract
A 39A MeV {sup 38}S radioactive beam was used with inverse kinematics to measure angular distributions for elastic and inelastic proton scattering from a CH{sub 2} target. Optical potential and folding model calculations are compared with the elastic distribution. Using coupled channel calculations, the {beta}{sub 2} value for the 2{sub 1}{sup +} state is determined to be 0.35{plus_minus}0.04. This value, when compared with the corresponding result from a Coulomb excitation measurement, leads to M{sub n}/M{sub p}=(1.5{plus_minus}0.3) N/Z, indicating an isovector contribution to the 2{sub 1}{sup +} state of {sup 38}S. {copyright} {ital 1997} {ital The American Physical Society}
- Published
- 1997
40. Elastic and inelastic scattering of protons on 38S in inverse kinematics
- Author
-
J.A. Scarpaci, D. Bazin, A. Azhari, Michael Fauerbach, J. A. Brown, F. Maréchal, J. H. Kelley, D. J. Morrissey, P. Thirolf, J. K. Jewell, Y. Blumenfeld, T. Suomijärvi, S. Ottini, P. D. Cottle, K. W. Kemper, T. Glasmacher, S. E. Hirzebruch, and S. Danczyk
- Subjects
Physics ,Elastic scattering ,Nuclear and High Energy Physics ,Quasielastic scattering ,Nuclear Theory ,Inelastic scattering ,Deep inelastic scattering ,Inelastic neutron scattering ,Physics::Accelerator Physics ,Scattering theory ,Atomic physics ,Nuclear Experiment ,Nucleon ,Excitation - Abstract
Elastic and inelastic scattering of protons on unstable 38 S nuclei has been measured in inverse kinematics by using a 38 S secondary beam at 39 MeV/nucleon. The excitation energy spectrum is measured up to 5 MeV. The first 2 + state is seen at 1.2 MeV excitation energy, and strength at around 3–5 MeV is also observed. Angular distributions for inelastic and elastic scattering are shown and compared to optical potential and folding model calculations. The preliminary β 2 value extracted for the first 2 + state is 0.38±0.05.
- Published
- 1997
41. Energy Savings in Methanol Synthesis: Use of Heat Integration Techniques and Simulation Tools
- Author
-
F Maréchal
- Subjects
General Chemical Engineering ,Computer Science Applications - Published
- 1997
42. Deformation of Sr and Rb isotopes close to theN=Zline viaβ-decay studies using the total absorption technique
- Author
-
Ph. Dessagne, Luis Caballero, Alejandro Algora, W. Gelletly, J. L. Tain, M. D. Salsac, F. Maréchal, A. B. Perez-Cerdan, G. Heitz, L. M. Fraile, E. Nacher, E. Poirier, M. J. G. Borge, B. Rubio, Olof Tengblad, Pedro Sarriguren, A. Jungclaus, and J. Agramunt
- Subjects
Physics ,Nuclear and High Energy Physics ,Isotope ,Quasiparticle ,Prolate spheroid ,Absorption (logic) ,Deformation (meteorology) ,Atomic physics ,Ground state ,Beta decay ,Line (formation) - Abstract
A study of the Gamow-Teller strength distributions $B$(GT) in the beta decay of ${}^{78}$Sr and ${}^{76,78}$Rb has been made using a total absorption spectrometer (TAS). Following the success in deducing the sign of the deformation for ${}^{76}$Sr, a similar approach is adopted for ${}^{78}$Sr based on a comparison of the measured $B$(GT) with quasiparticle random-phase approximation calculations. This work confirms its previously expected prolate deformation in the ground state. Conclusions about the structure of the odd-odd ${}^{76,78}$Rb isotopes have been drawn based on their measured $B$(GT) distributions.
- Published
- 2013
43. Low-lying neutronfp-shell intruder states in27Ne
- Author
-
S. M. Brown, W. N. Catford, J. S. Thomas, B. Fernández-Domínguez, N. A. Orr, M. Labiche, M. Rejmund, N. L. Achouri, H. Al Falou, N. I. Ashwood, D. Beaumel, Y. Blumenfeld, B. A. Brown, R. Chapman, M. Chartier, N. Curtis, G. de France, N. de Sereville, F. Delaunay, A. Drouart, C. Force, S. Franchoo, J. Guillot, P. Haigh, F. Hammache, V. Lapoux, R. C. Lemmon, A. Leprince, F. Maréchal, X. Mougeot, B. Mouginot, L. Nalpas, A. Navin, N. P. Patterson, B. Pietras, E. C. Pollacco, A. Ramus, J. A. Scarpaci, I. Stefan, and G. L. Wilson
- Subjects
Physics ,Nuclear and High Energy Physics ,Quenching (fluorescence) ,010308 nuclear & particles physics ,Nuclear Theory ,SHELL model ,Shell (structure) ,01 natural sciences ,Nuclear physics ,0103 physical sciences ,Neutron ,Atomic physics ,010306 general physics ,Beam (structure) - Abstract
The quenching of the N=20 shell gap in neutron-rich nuclei is investigated by studying the single-particle structure of 27Ne via neutron transfer using a 26Ne beam. Two low-lying negative-parity intruder states have been observed, the lowest of which is identified as Jπ=3/2−, confirming earlier speculations. A level identified as 7/2− is observed higher in energy than the 3/2−, contrary to the ordering at β-stability and at an energy significantly different from the predictions of previous shell-model calculations. The measured energies and deduced spectroscopic factors are well reproduced in full (0,1)-ℏω 0s-0p-0d-1s-0f-1p calculations in which there is a significant ad hoc reduction (∼0.7 MeV) in the N=20 shell gap.
- Published
- 2012
44. Emergence of theN=16shell gap inO21
- Author
-
B. Fernández-Domínguez, J. S. Thomas, W. N. Catford, F. Delaunay, S. M. Brown, N. A. Orr, M. Rejmund, M. Labiche, M. Chartier, N. L. Achouri, H. Al Falou, N. I. Ashwood, D. Beaumel, Y. Blumenfeld, B. A. Brown, R. Chapman, N. Curtis, C. Force, G. de France, S. Franchoo, J. Guillot, P. Haigh, F. Hammache, V. Lapoux, R. C. Lemmon, F. Maréchal, A. M. Moro, X. Mougeot, B. Mouginot, L. Nalpas, A. Navin, N. Patterson, B. Pietras, E. C. Pollacco, A. Leprince, A. Ramus, J. A. Scarpaci, N. de Séréville, I. Stephan, O. Sorlin, and G. L. Wilson
- Subjects
Physics ,Radioactive ion beams ,Nuclear and High Energy Physics ,Light nucleus ,010308 nuclear & particles physics ,0103 physical sciences ,SHELL model ,Shell (structure) ,Atomic physics ,010306 general physics ,GeneralLiterature_REFERENCE(e.g.,dictionaries,encyclopedias,glossaries) ,01 natural sciences - Abstract
This is the publisher's version, also available electronically from http://journals.aps.org/prc/abstract/10.1103/PhysRevC.84.011301.
- Published
- 2011
45. Anomalous phosphenes in ocular protontherapy
- Author
-
Valentin Calugaru, F. Maréchal, E. Khan, Livio Narici, R. Dendale, C. Mabit, L. Desjardin, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Institut Curie Centre de Protonthérapie d'Orsay, Institut Curie [Paris], and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Atmospheric Science ,genetic structures ,medicine.medical_treatment ,Phosphenes ,Aerospace Engineering ,030218 nuclear medicine & medical imaging ,03 medical and health sciences ,Light flashes ,Flash (photography) ,0302 clinical medicine ,Optics ,Nuclear magnetic resonance ,Protons ,ALTEA ,medicine ,Physics ,business.industry ,Settore FIS/01 - Fisica Sperimentale ,Radiation dose ,Astronomy and Astrophysics ,Settore FIS/07 - Fisica Applicata(Beni Culturali, Ambientali, Biol.e Medicin) ,3. Good health ,Radiation therapy ,Geophysics ,Phosphene ,Space and Planetary Science ,030220 oncology & carcinogenesis ,[PHYS.PHYS.PHYS-MED-PH]Physics [physics]/Physics [physics]/Medical Physics [physics.med-ph] ,General Earth and Planetary Sciences ,sense organs ,business - Abstract
We have undertaken a clinical ground study of proton-induced light flashes (phosphenes). Patients treated at the Institut Curie – Centre de Protontherapie in Orsay, France, received radiation therapy to cure ocular and skull-base cancers. Sixty percent of the patients treated for choroidal melanomas using 73 MeV protons report anomalous phosphenes. Delivering a radiation dose on the retina only is not sufficient to trigger the light flash. The present study may be the first indication of phosphenes triggered by protons of few tens of MeV.
- Published
- 2010
46. Study of [sup 60]Fe(n,γ)[sup 61]Fe reaction of astrophysical interest via d([sup 60]Fe,pγ) indirect reaction
- Author
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S. Giron, F. Hammache, N. de Séréville, D. Beaumel, J. Burgunder, L. Caceres, E. Clement, G. Duchene, F. Flavigny, G. De France, S. Franchoo, B. Fernandez, D. Galaviz-Redondo, L. Gasques, J. Gibelin, A. Gillibert, S. Grevy, J. Guillot, M. Heil, J. Kiener, V. Lapoux, F. Maréchal, A. Matta, Y. Matea, M. Moukaddam, L. Nalpas, A. Obertelli, L. Perrot, R. Raabe, J. A. Scarpaci, O. Sorlin, I. Stefan, C. Stoedel, M. Takechi, J. C. Thomas, Y. Togano, Claudi Spitaleri, Claus Rolfs, and Rosario G. Pizzone
- Subjects
Nuclear reaction ,Physics ,Angular momentum ,010308 nuclear & particles physics ,Context (language use) ,7. Clean energy ,01 natural sciences ,Nuclear physics ,Supernova ,Nucleosynthesis ,Excited state ,0103 physical sciences ,Atomic physics ,Radioactive decay ,Excitation - Abstract
INTEGRAL and RHESSI spacecrafts recently detected the 1.173 and 1.333 MeV γ‐ray lines coming from the 60Fe—60Co—60Ni radioactive decay chain. The long lived isotope 60Fe (T1/2 = 1.5 106y) is believed to be primarily produced in core‐collapse supernovae. However the interpretation of the observations is difficult because of the large uncertainties concerning 59Fe(n,γ)60Fe and 60Fe(n,γ)61Fe cross sections, involved in 60Fe nucleosynthesis.The direct component of the 60Fe(n,γ)61Fe reaction was studied indirectly via the d(60Fe,pγ)61Fe transfer reaction. The experiment performed in GANIL in spring 2009 will allow to determine the excitation energies of the populated excited states of 61Fe and for the first time their spectroscopic factors as well as their transfer angular momentum.I will first give an overview of the astrophysical context, then I will describe the experimental setup and finally present some preliminary results of the ongoing analysis.
- Published
- 2010
47. Secreted subtilisin Sub3 from Microsporum canis is required for adherence to but not for invasion of the epidermis
- Author
-
A, Baldo, A, Mathy, J, Tabart, P, Camponova, S, Vermout, L, Massart, F, Maréchal, M, Galleni, and B, Mignon
- Subjects
Virulence ,Guinea Pigs ,Cats ,Cell Adhesion ,Animals ,Dermatomycoses ,Microsporum ,Female ,Subtilisins ,Epidermis ,Hair Follicle ,Skin - Abstract
Microsporum canis is a pathogenic dermatophyte that causes a superficial cutaneous mycosis, mainly in cats and humans. Proteolytic enzymes, including subtilisins, have been postulated to be key factors involved in adherence and invasion of the stratum corneum and keratinized epidermal structures.To evaluate the importance of Sub3 as a M. canis virulence factor using a SUB3 RNA-silenced strain.The stability of a previously constructed RNA-silenced strain IHEM 22957 was tested in three different ways. The involvement of Sub3 in the adherence process was evaluated using a new ex vivo adherence model of M. canis arthroconidia to feline epidermis. In order to investigate the contribution of Sub3 in epidermal invasion, the pathogenicity of the SUB3 silenced strain was compared with that of the control strain in a guinea pig model of experimental M. canis dermatophytosis.The silenced strain was shown to be stable after four in vitro transfers and after the in vivo experimental infection. This strain has dramatic loss of adherence capacity to feline corneocytes when compared with the parental strain. In contrast, no significant differences were observed at any time during the infection between the control strain and the SUB3 silenced strain, indicating that Sub3 secretion is not required for invasion of epidermal structures.RNA interference is a useful tool to evaluate pathogenic mechanisms of M. canis. For the first time, a role in pathogenicity could be attributed to a protease of a dermatophyte, namely Sub3 from M. canis, which is required for adherence to but not for invasion of the epidermis.
- Published
- 2009
48. Breakdown of theZ=8Shell Closure in UnboundO12and its Mirror Symmetry
- Author
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H. Okamura, O. Sorlin, I. Stefan, D. Beaumel, Maya Takechi, P. Roussel-Chomaz, Hidetada Baba, Xavier Mougeot, Shin'ichiro Michimasa, Hironori Iwasaki, D. Suzuki, I. Mukha, S. Franchoo, J. Guillot, L. Nalpas, M. Assié, Fairouz Hammache, J. A. Scarpaci, Hideaki Otsu, A. Gillibert, F. Maréchal, V. Lapoux, A. Ramus, A. Drouart, Hiroyoshi Sakurai, E. C. Pollacco, N. Keeley, Y. Blumenfeld, and N. de Séréville
- Subjects
Physics ,Nuclear reaction ,Proton ,010308 nuclear & particles physics ,Nuclear Theory ,Hadron ,General Physics and Astronomy ,Elementary particle ,01 natural sciences ,Excited state ,0103 physical sciences ,Atomic physics ,Nuclear Experiment ,010306 general physics ,Isotopes of beryllium ,Nucleon ,Mirror symmetry - Abstract
An excited state in the proton-rich unbound nucleus $^{12}\mathrm{O}$ was identified at 1.8(4) MeV via missing-mass spectroscopy with the $^{14}\mathrm{O}(p,t)$ reaction at $51\text{ }\text{ }A\mathrm{MeV}$. The spin-parity of the state was determined to be ${0}^{+}$ or ${2}^{+}$ by comparing the measured differential cross sections with distorted-wave calculations. The lowered location of the excited state in $^{12}\mathrm{O}$ indicates the breakdown of the major shell closure at $Z=8$ near the proton drip line. This demonstrates the persistence of mirror symmetry in the disappearance of the magic number 8 between $^{12}\mathrm{O}$ and its mirror partner $^{12}\mathrm{Be}$.
- Published
- 2009
49. Breakdown of the Z=8 shell closure in unbound 12O and its mirror symmetry
- Author
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D, Suzuki, H, Iwasaki, D, Beaumel, L, Nalpas, E, Pollacco, M, Assié, H, Baba, Y, Blumenfeld, N, De Séréville, A, Drouart, S, Franchoo, A, Gillibert, J, Guillot, F, Hammache, N, Keeley, V, Lapoux, F, Maréchal, S, Michimasa, X, Mougeot, I, Mukha, H, Okamura, H, Otsu, A, Ramus, P, Roussel-Chomaz, H, Sakurai, J-A, Scarpaci, O, Sorlin, I, Stefan, and M, Takechi
- Abstract
An excited state in the proton-rich unbound nucleus 12O was identified at 1.8(4) MeV via missing-mass spectroscopy with the 14O(p,t) reaction at 51 AMeV. The spin-parity of the state was determined to be 0+ or 2+ by comparing the measured differential cross sections with distorted-wave calculations. The lowered location of the excited state in 12O indicates the breakdown of the major shell closure at Z=8 near the proton drip line. This demonstrates the persistence of mirror symmetry in the disappearance of the magic number 8 between 12O and its mirror partner 12Be.
- Published
- 2009
50. Neutron correlations in 6He viewed through nuclear break-up
- Author
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C. M. Petrache, D. Bazin, Y. Blumenfeld, D. Beaumel, J. A. Scarpaci, F. Maréchal, M. Chabot, D. Mengoni, Johan Nyberg, W. N. Catford, A. Chatterjee, J. C. Angélique, H. Iwasaki, C. Monrozeau, T. Tuna, Muriel Fallot, Denis Lacroix, F. Skaza, M. Assié, Institut de Physique Nucléaire d'Orsay (IPNO), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), National Superconducting Cyclotron Laboratory, Michigan State University [East Lansing], Michigan State University System-Michigan State University System, Scholl of Electronics and Physical Sciences, University of Surrey (UNIS), Nuclear Physics Division, Bhabha Atomic Research Centre (BARC), Government of India, Department of Atomic Energy-Government of India, Department of Atomic Energy, Laboratoire SUBATECH Nantes (SUBATECH), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Nantes (UN)-Mines Nantes (Mines Nantes), Dipartimento di Fisica, Universita di Camerino, Department of Physics [Jyväskylä Univ] (JYU), University of Jyväskylä (JYU), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Mines Nantes (Mines Nantes)-Université de Nantes (UN)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)
- Subjects
Physics ,Nuclear and High Energy Physics ,010308 nuclear & particles physics ,Nuclear reaction involving few-nucleons systems ,Nuclear Theory ,Hadron ,Direct reactions ,Nuclear reaction models and methods ,Break up and momentum distributions ,Alpha particle ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,01 natural sciences ,Coincidence ,Nuclear physics ,Correlation function (statistical mechanics) ,24.50.+g ,25.10.+s ,24.10.-i ,25.60.Gc ,0103 physical sciences ,Nuclear fusion ,Neutron ,Atomic physics ,010306 general physics ,Nuclear Experiment ,Spiral ,Beam (structure) - Abstract
The nuclear break-up of 6He on a 208Pb target was studied at 20A MeV using a secondary beam of 6He produced by the SPIRAL facility at GANIL. $ \alpha$ -particles were detected in coincidence with two neutrons with a large angular coverage and the reaction mechanism was identified. From the distribution of the relative angles between the two neutrons the correlation function was extracted. It shows a strong correlation at small relative angles attributed to the contribution of the di-neutron configuration of 6He .
- Published
- 2008
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