It is shown that angular distributions of high-energy proton groups from ($n, p$) reactions should evidence sharp maxima near the forward direction, which arise neutrons with large impact parameters interacting protons out in "tails" initial nucleus. The positions these peaks are characterized by allowed values orbital momenta ${l}_{n}$ neutron can be captured to form final state. A study such therefore may well lead information concerning spins and parities nuclear energy levels, as case...

We have estimated the parameters of optical potential for low energy pion-nucleus scattering from values obtained empirically in analysis pionic atom data. The ambiguities these are discussed. shape elastic cross section light elements is particularly sensitive to relative strength repulsive and velocity-dependent attractive parts potential, well reproduced by parameters. Absorption dominant reaction channel at energies. Pion nucleon phase shifts used extrapolate model higher behavior...

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The Kallio-Kolltveit interaction is used as the effective in a distorted-wave-approximation analysis of few transitions reactions ${\mathrm{C}}^{12}(p,{p}^{\ensuremath{'}})$ and ${\mathrm{Ca}}^{40}(p,{p}^{\ensuremath{'}})$ at energies ranging from 25 to 55 MeV, comparison made with results obtained using Yukawa interactions parametrized on basis low-energy nucleon-nucleon nuclear data. It concluded that gives good account basic features reactions, whereas other considered lead somewhat...

A description of the experimental results obtained for Mg 25 and Al is given based upon assumption that excited nuclear states are rotational states. In members four bands can be identified. The band on ground state assigned K = 5/2 whilst three excited-state bands, two positive parity one negative parity, 1/2. dipole γ-ray transitions between 1/2 forbidden model it a salient feature cascading in ground-state always amongst weakest from to bands. Besides giving quantitative account decay...

The existence of molecular states two C/sup 12/ nuclei is discussed, based on its physical origin and implications for nuclear structure. experimental data are the cross sections carbon oxygen bombardment by O/sup 16/ ions at energies to 15 Mev. width spacing observed + resonance levels cannot be attributed compound nucleus Mg/sup 24/. that a well much larger than usual 24/ nucleus. resonances almost pure single-particle nuclei. A qualitative illustration given potentials connected with...

The high temperature behavior of carbon-phenolic and carbon-carbon composites was investigated. Models were developed which describe the thermal me chanical responses such when rapidly heated to temperatures. On basis models, a computer code written that provides pressure distributions, vapor volatile formation rates, amount char, stress strain, damage in plates.

The energy dependence of the optical model parameters for low energy, 0-50 MeV, pions was determined by a compromise fit to pionic atoms, ${\ensuremath{\pi}}^{+}$ elastic scattering, and ${\ensuremath{\pi}}^{\ensuremath{\mp}}$ absorption measurements.NUCLEAR REACTIONS Pion-nucleus potential, scattering MeV on various targets.

A fit to pionic atom data is used determine four of the parameters low energy pion-nucleus optical potential, while other are taken from theory. The resulting potential predict elastic scattering 30-50 MeV pions. effects extrapolating par\aa{}meters 50 with a simple dependence examined.NUCLEAR REACTIONS Optical pi-mesic atoms. Calculated extrapolated at 30, 40, on individual targets.

The inelastic cross sections and polarizations for the excitation of some observed ${2}^{+}$ ${3}^{\ensuremath{-}}$ levels $^{12}\mathrm{C}$, $^{16}\mathrm{O}$, $^{40}\mathrm{Ca}$ by 156-MeV protons were calculated in distorted-wave, impulse approximation using particle-hole transition densities Gillet collaborators. results compared with available experimental data good qualitative agreement was obtained; particular provided necessary enhancements sections. Fits also attempted theory...

Non-traditional design criteria such as flexibility, robustness, survivability and others (collectively referred to the “ilities”) are increasingly recognized critical system properties for success of aerospace programs. While most decision makers would agree that ilities important properties, they neither well-defined nor easily evaluated in isolation. some evaluation methodologies do exist (e.g., real options flexibility), there is a need holistic framework describing systems with these...

Abstract A framework to aid in the understanding of uncertainties and techniques for mitigating even taking positive advantage them is presented. The an attempt clarify wide range that affect complex systems, risks (and opportunities) they create, strategies system architects can use mitigate (or take advantage) them, resulting attributes. Current developing methods dealing with are projected onto understand their relative roles interactions.

The inelastic scattering of 35-MeV protons by $^{208}\mathrm{Pb}$ was measured with a resolution 5-8 keV. Angular distributions states up to an excitation energy about 8 MeV were obtained. Collective model calculations enabled the $l$ transfers many be identified. possibility ${1}^{+}$ is discussed. Microscopic made both phenomenological and theoretical information. large number observed unnatural parity permitted role noncentral forces in these transitions investigated.NUCLEAR REACTIONS...

The effects of distorted waves on the high-energy inelastic scattering protons by $^{12}\mathrm{C}$ were investigated using distorted-wave-impulse approximation. It was found that except for electric monopole transitions, use results in a reduction peak differential cross section factor 2 or 3, with little effect location shape curve. also presence spin-orbit coupling distorting potential has non-negligible proton polarization at some angles. ${2}^{+}$ level 4.43 MeV treated detail...

Tests were conducted to validate the model and CHAR computer code previously developed for calculating thermomechanical behavior of carbon-phenolic carbon-carbon composites exposed high temperatures. Temperature distributions in damage rapidly heated measured. The data com pared well results calculated by code. Parametric studies also performed, which yield physical insights into ply-lift phenomenon observed solid rocket motor exit cone linings, provide a guide design parts made carbon-...

Seldom have comparative studies of educational assessment systems been undertaken, especially regarding their standard setting procedures. This study examines the effects governance structures on power relations in dominant school-leaving or university-entrance examinations. We present acritical analysis published research and policy documents, including sense-checking with senior practitioners from 22 jurisdictions. The nature three cases Ireland, USA India are described detail to showcase...

Operational Excellence (OpEx) is understood by the quest to continuously improve performance. While used organizations worldwide, capacity of OpEx programmes make successful in unstable business environments has been challenged. This article aims answer research question what nature relationship between and Organizational Agility truly is. The authors have previously proposed a theoretical framework supporting link Excellence, Culture, Agility. built on strong conceptual background, this...

Following a major shortage of 99Mo in the 2009–2010 period, concern grew that aging reactor production facilities needed to be replaced. Most producers were using highly enriched 235U (HEU) as target material. The Organisation for Economic Co-...Read More