scholarly journals Short range nucleon correlations studied with electron and photon probes

2020 ◽  
Author(s):  
Ian MacGregor
Keyword(s):  
Nuclear Physics ◽  
Short Range ◽  
Nucleon Nucleon ◽  
Light Nuclei ◽  
Nucleon Emission ◽  
Group A ◽  
Three Body ◽  
The University ◽  
Electron And Photon

This paper reviews experimental research into two- and three-body nucleon-nucleon interactions, carried out by the University of Glasgow Nuclear Physics research group. A key aim of these studies has been to elucidate the role of short-range nucleon-nucleon correlations (SRC). Studies of photon-induced two- and three-nucleon emission reactions from a range of light nuclei, carried out at the 840 MeV Mainz electron microtron MAMI-B, have provided detailed information on the contributing mechanisms. More recent electron scattering studies at the 6.0 GeV Jefferson Laboratory have probed SRC at high values of Q^{2}2 and x_{B}B and suggested a connection between SRC and the EMC effect.

scholarly journals Role of SatO2, PaO2/FiO2 Ratio and PaO2 to Predict Adverse Outcome in COVID-19: A Retrospective, Cohort Study

2021 ◽  
Vol 18 (21) ◽  
pp. 11534
Author(s):  
Stefano Sartini ◽  
Laura Massobrio ◽  
Ombretta Cutuli ◽  
Paola Campodonico ◽  
Cristina Bernini ◽  
...  
Keyword(s):  
Respiratory Failure ◽  
Adverse Outcome ◽  
University Hospital ◽  
Rt Pcr ◽  
Threatening Condition ◽  
Life Threatening ◽  
Group A ◽  
Group B ◽  
The University

COVID-19 respiratory failure is a life-threatening condition. Oxygenation targets were evaluated in a non-ICU setting. In this retrospective, observational study, we enrolled all patients admitted to the University Hospital of Genoa, Italy, between 1 February and 31 May 2020 with an RT-PCR positive for SARS-CoV-2. PaO2, PaO2/FiO2 and SatO2% were collected and analyzed at time 0 and in case of admission, patients who required or not C-PAP (groups A and B) were categorized. Each measurement was correlated to adverse outcome. A total of 483 patients were enrolled, and 369 were admitted to hospital. Of these, 153 required C-PAP and 266 had an adverse outcome. Patients with PaO2 <60 and >100 had a higher rate of adverse outcome at time 0, in groups A and B (OR 2.52, 3.45, 2.01, respectively). About the PaO2/FiO2 ratio, the OR for < 300 was 3.10 at time 0, 4.01 in group A and 4.79 in group B. Similar odds were found for < 200 in any groups and < 100 except for group B (OR 11.57). SatO2 < 94% showed OR 1.34, 3.52 and 19.12 at time 0, in groups A and B, respectively. PaO2 < 60 and >100, SatO2 < 94% and PaO2/FiO2 ratio < 300 showed at least two- to three-fold correlation to adverse outcome. This may provide simple but clear targets for clinicians facing COVID-19 respiratory failure in a non ICU-setting.

scholarly journals Low-energy neutron scattering on light nuclei and $^{19}$B as a $^{17}$B-$n$-$n$ three-body system in the unitary limit

2020 ◽  
Author(s):  
Jaume Carbonell ◽  
Emiko Hiyama ◽  
Rimantas Lazauskas ◽  
Francisco Miguel Marqués
Keyword(s):  
Scattering Length ◽  
Nucleon Nucleon ◽  
Light Nuclei ◽  
Unitary Limit ◽  
Body System ◽  
Resonant States ◽  
Pauli Repulsion ◽  
Nucleus Scattering ◽  
Nucleon Nucleon Interaction ◽  
Three Body

We consider the evolution of the neutron-nucleus scattering length for the lightest nuclei. We show that, when increasing the number of neutrons in the target nucleus, the strong Pauli repulsion is weakened and the balance with the attractive nucleon-nucleon interaction results into a resonant virtual state in ^{18}18B. We describe ^{19}19B in terms of a ^{17}17B-nn-nn three-body system where the two-body subsystems ^{17}17B-nn and nn-nn are unbound (virtual) states close to the unitary limit. The energy of ^{19}19B ground state is well reproduced and two low-lying resonances are predicted. Their eventual link with the Efimov physics is discussed. This model can be extended to describe the recently discovered resonant states in ^{20,21}20,21B.

scholarly journals A MICROSCOPIC CLUSTER MODEL STUDY OF 3He + p SCATTERINGS

2010 ◽  
Vol 25 (21n23) ◽  
pp. 1750-1753
Author(s):  
K. ARAI ◽  
S. AOYAMA ◽  
Y. SUZUKI
Keyword(s):  
Cluster Model ◽  
Nucleon Nucleon ◽  
Phase Shifts ◽  
Minor Role ◽  
S Wave ◽  
P Waves ◽  
Model Study ◽  
Three Body ◽  
A Minor

3 He + p scattering phase shifts for the S- and P-waves are studied in a microscopic cluster model in order to investigate the role of the d + 2p channel in the low-energy phase shifts. In the present cluster model, the description of the 3 He wave function is extended from a simple (0s)3 model to a three-body model and two different nucleon-nucleon interactions, the Minnesota and AV8' potentials, are employed. The present extended cluster model shows that the d + 2p channel is indispensable to reproduce the resonant phase shifts in the AV8' potential while it plays a minor role in the MN potential. On the contrary, the role of this channel in the S-wave non-resonant phase shifts is negligible in both potentials.

scholarly journals Quasi-free scattering in inverse kinematics as a tool to unveil the structure of nuclei

2021 ◽  
Vol 57 (3) ◽  
Author(s):  
V. Panin ◽  
T. Aumann ◽  
C. A. Bertulani
Keyword(s):  
Inverse Kinematics ◽  
Short Range ◽  
Nucleon Nucleon ◽  
Light Nuclei ◽  
Radioactive Beams ◽  
Particle Structure ◽  
Ongoing Research ◽  
The Past ◽  
Characteristic Features ◽  
Large Research

AbstractQuasi-free scattering of electrons and protons has been extensively utilized in the past to study the single-particle structure of nuclei, clustering in light nuclei, and short-range correlated nucleon–nucleon pairs in nuclei. Recently, this approach has been applied in inverse kinematics using hydrogen targets. The characteristic features of this reaction and the experimental challenges and advantages of inverse-kinematics experiments are summarized. The applicability to radioactive beams opens a large research potential to study a variety of properties of neutron-to-proton asymmetric nuclei. Applications of quasi-free scattering in inverse kinematics and its potential are reviewed based on recent and ongoing research programs at different accelerator facilities worldwide.

The Role of an Agile and Lean Project Management Toolkit for Assisting E-Learning Project Management Teams in Multi-National Organisations

2022 ◽  
pp. 134-162
Author(s):  
Jonathan Bishop ◽  
Kamal Bechkoum
Keyword(s):  
Project Management ◽  
It Project Management ◽  
Learning And Teaching ◽  
E Learning ◽  
Group A ◽  
The Right ◽  
The University ◽  
Learning Projects ◽  
Core Part

Project management is a term for which there are endless books professing the right way to conduct it. Project management is the systematic application of a standardized approach to conducting a project that increases that project's chances of success. It is known that IT projects are some of those projects most likely to fail, and e-learning projects are no different. The aim of this chapter is to explain how it might be possible to develop a toolkit that could allow e-learning systems of any scale to be developed by those who often have to deliver learning, but may not necessarily have skills in project management or ICT development. It is intended that the proposed toolkit would be valued by other internationally focussed organisations where learning and teaching are a core part of the activities that it conducts, but on a smaller scale. To achieve this, research is proposed at the University of Gloucestershire and Crocels Community Media Group. A pilot study is conducted, and the questionnaire for the study proves to be reliable.

scholarly journals A somewhat random walk through nuclear and particle physics

2021 ◽  
Author(s):  
Thomas Cohen ◽  
Nicholas Poniatowski
Keyword(s):  
Particle Physics ◽  
Nuclear Physics ◽  
Higgs Mechanism ◽  
University Of Maryland ◽  
Maryland College ◽  
College Park ◽  
The University ◽  
Basic Philosophy ◽  
Do So

These notes are an outgrowth of an advanced undergraduate course taught at the University of Maryland, College Park. They are intended as an introduction to various aspects of particle and nuclear physics with an emphasis on the role of symmetry. The basic philosophy is to introduce many of the fundamental ideas in nuclear and particle physics using relatively sophisticated mathematical tools -- but to do so in as a simplified a context to explain the underlying ideas. Thus, for example, the Higgs mechanism is discussed in terms of an Abelian Higgs model. The emphasis is largely, but not entirely theoretical in orientation. The goal is for readers to develop an understanding of many of the underlying issues in a relatively sophisticated way.

scholarly journals A systematic study of the effect of short range correlations on the occupation numbers of the shell model orbits in light nuclei

2019 ◽  
Vol 3 ◽  
pp. 48
Author(s):  
G. A. Lalazissis ◽  
S. E. Massen ◽  
C. P. Panos
Keyword(s):  
Shell Model ◽  
Systematic Study ◽  
Ground State ◽  
Short Range ◽  
Light Nuclei ◽  
Occupation Numbers ◽  
Approximate Treatment ◽  
Short Range Correlations

The role of short-range correlations on the depletion of the Fermi sea is studied in light nuclei.The short range correlations are considered in an approximate treatment allowing a systematic study of nuclei in the region 4 < A < 40. The "natural orbital" representation is used for the determination of the occupation probabilities of the shell model orbits of the ground state wave function. The depletion of the nuclear Fermi sea appears to be, on the average, about 32%.

Physics on the Periphery: A Research School at the University of Lisbon under Salazar's Dictatorship

2011 ◽  
Vol 41 (3) ◽  
pp. 303-343 ◽  
Author(s):  
Júlia Gaspar ◽  
Ana Simões
Keyword(s):  
Nuclear Physics ◽  
Scientific Policy ◽  
Research Activity ◽  
High Culture ◽  
Research School ◽  
National Education ◽  
Leading Role ◽  
Political Environments ◽  
The University

In this paper we discuss the emergence, consolidation, and dissolution of the research school that blossomed at the Laboratory of Physics of the University of Lisbon under the joint leadership of Cyrillo Soares and Manuel Valadares. From 1929 to 1947, this school flourished by the training of some of its members in European research centers, followed by research activity on x-ray spectrography, radioactivity, and nuclear physics at home. This project was supported by grants awarded by the Board for National Education created in 1929, and then the Institute for High Culture, established in 1936 during the period of Salazar's dictatorship. While the success of the Laboratory of Physics as a research school in a so-called peripheral context follows Gerald Geison's criteria, these criteria are unable to account for its dissolution. Its example illuminates how the interactions of a research school with its immediate social, academic, and political environments may be important to take into consideration. We offer a new historiographical interpretation of the events behind the dissolution of the Laboratory of Physics. Contrary to the received view, we argue that these events were not strictly political, and that discussions within the Faculty of Sciences on the role of scientific research, and on scientific policy generally, generated a hostile academic environment which played a leading role in the dissolution. Finally, we highlight the advantages of rethinking the concept of "periphery" as a perspective, following the suggestion of Gavroglu and colleagues.

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