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Nomenclatura Unesco > (22) Física > (2208) Nucleónica
(2208.01) Manipulación de haces (2208.02) Fuentes de haces
(2208.03) Reactores de fusión (2208.04) Núcleos
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(2208.09) Confinamiento de plasma (2208.99) Otras (especificar)

Mostrando recursos 1 - 20 de 396

1. Compton Scattering off Nucleons: Focus on the Nucleonic Low-Energy Degrees of Freedom - Harald W. Grießhammer
In this sketch, I focus on Physics and formalism behind dynamical polarisabilities, a new tool to test and interpret quantitative predictions about the low-energy degrees of freedom inside the nucleon from the multipoles of Compton scattering for photon energies below 300 MeV. A way to extract them from double-polarised precision experiments is sketched. Predictions from Chiral Effective Field Theory, both on the proton and on the neutron, serve as guideline for forthcoming experiments. Special interest is put on the rôle of the nucleon spin-polarisabilities. For details and a complete list of references, consult Refs. [1, 2, 3]. 1

2. Propagation of Ultra High Energy Protons and Gamma Rays over Cosmological Distances and Implications for Topological Defect Models - Protheroe And; R. J. Protheroe; P. A. Johnson
We describe the results of a hybrid matrix--Monte Carlo calculation of cascading of UHE cosmic rays and fl-rays through the cosmic background radiation fields over cosmological distances. We calculate the fl-ray and neutrino emission that results from the cascade, as well as the effect of cascading on the primary spectrum. We discuss the results for various cosmic ray injection spectra and primary species. Certain models for the production of the highest energy cosmic rays are ruled out. 1 Introduction It was first noted by Greisen [1], and Zatsepin and Kuz'min [2] (GZK) that the nucleonic component of UHE cosmic rays...

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5. Primordial Nucleosynthesis And Dark Matter - Subir Sarkar
Introduction The focus of this Workshop is the problem of dark matter. It is well established that the dynamics of galaxies and clusters is dominated by unseen matter which contributes ¸ 10 \Gamma 20% of the critical density. 2 In contrast, the luminous (nucleonic) matter in such structures has a density parameter of only 3 \Omega N ' 2:2 \Theta 10 \Gamma3 + 6:1 \Theta 10 \Gamma4 h \Gamma1:3 ; (1) where the first term accounts for the stars and the second for the X-ray emitting gas. Here, h j H 0 /100kmsec \Gamma1 Mpc \Gamma1 is the present Hubble...

6. Production of cosmogenic 7Be isotope in the atmosphere: Full 3-D modeling - Ilya G. Usoskin; Gennady A. Kovaltsov
[1] We present a physical model to calculate production of cosmogenic isotope 7Be in the atmosphere. The model is based on a full Monte Carlo simulation of an electromagnetic-muon-nucleonic cascade in the atmosphere, using CORSIKA and FLUKA packages. The present results are in broad agreement with earlier empirical and semiempirical models but predict higher production rate than some recent theoretical models. A comparison to direct and indirect measurements of the 7Be production rate in the atmosphere confirms the validity of the model in the whole range of geographical latitudes and altitudes. Results of the full Monte Carlo simulation are tabulated...

7. 30TH INTERNATIONAL COSMIC RAY CONFERENCE - Rekha Agarwal Mishra; Rajesh K. Mishra; Ravi Katare
Effect of high-speed solar wind streams on cosmic ray nucleonic intensity during low amplitude days

8. Journal of Atmospheric and Solar-Terrestria
iza mp dy niver tute, vised ne 27 overlap in the study of solar-terrestrial relationships. It monitor count rate. Although suitable for correlation Primary cosmic rays initiate a nucleonic–electromag-tude balloon flights at few g=cm of the residual atmosphere (e.g., a review by Bazilevskaya and Svirz-hevskaya, 1998). Since there are no routine worldwide

9. ENERGY RESEARCH AND DEVELOPMENT ADMINIsTRATION - Donald J. Dudziak; Sa Iamos; Donald J. Dudziak
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10. ENERGY RESEARCH AND DEVELOPMENT ADMINIsTRATION - Donald J. Dudziak; Sa Iamos; Donald J. Dudziak
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11. Threshold Behaviour of Meson-Nucleon-S - Vertexfunctions And Determination; F. Kleefeld
A new method for the determination of the spin-1/2-3/2-mixing angle and the range parameter of the quarkmodel wavefunction of the resonance S \Gamma 11 (1535) is presented. The method ist based on a quantitative calculation of the total cross section of pp ! ppj at threshold. The quantitative on-shell treatment of ISI and FSI is discussed. INTRODUCTION Nearly all calculations for the determination of mixing angles between different spincomponents of baryon wavefunctions are based on spectroscopic models. Beside their advantages these models also contain some problems which are not dissolved yet. The goal of the presented work is an independent...

12. A PARTIAL SEQUENCE OF LIPOXYGENASE GENE FROM - Rough Lemon (citrus Jambhiri L; Akiko Sano; Kazuya Akimitsu; Hiroyuki Yamamoto
A full sequence of lipoxygenase (LOX) genes were available from various plants, however, nucleonic or enzymatic examinations had not been reported for any citrus genera nor species. In this study, we have amplified the partial region of transcripts encoding LOX of rough lemon (Citrus jambhirl L.) by reverse transcription-polymerase chain reaction (RT-PCR) with several primers designed from the alignment analysis of published plant LOX genes. The sequence of partial LOX coding region from rough lemon transcripts was identified by a direct sequencing from the RT-PCR product (601bp), and compared for homology with other plant LOX genes. Blast analysis indicated that...

A versatile γ-spectrum simulation tool has been developed to allow the generation of accurate γ-spectra for a wide range of NaI and HPGe detectors and for any mixture of γ-emitting radionuclides. The simulator provides full interactive control of a virtual γ-spectrometer for modeling various geometries with shielded and unshielded sources. The output consists of an interactive graph, containing cumulative and nuclide specific spectral distributions. More detailed spectral information and a detection efficiency graph are available as advanced options. The simulator, which can be accessed through the NUCLEONICA nuclear science and data portal, is a powerful tool for providing basic and...

14. Nuclear densities and the statistics of nucleonic constituents - Betz, Michel Emile Marcel; Hadjimichef, Dimiter
In the quark model of the nucleon, the Fermi statistics of the elementary constituents can in6uence significantly the properties of multinucleon bound systems. In the Skyrme model, on the other hand, the basic quanta are bosons, so that qualitatively different statistics effects can be expected a priori. In order to illustrate this point, we construct schematic one-dimensional quark and soliton models which yield fermionic nucleons with identical baryon densities. We then compare the baryon densities of a two-nucleon bound state in both models. Whereas in the quark model the Pauli principle for quarks leads to a depletion of the density...

15. Distribution of thorium nitrate between water and a mixture of butyl phosphate and butyl ether / - Anderson, Marion R.; Ames Laboratory.; U.S. Atomic Energy Commission. Technical Information Service.
An extraction system to remove the major portion of rare earths present in the commercial grade of thorium nitrate tetrahydrate available was found to be a necessary step in the production of thorium metal for nucleonic purposes. Distribution expressions were calculated and plotted, and equilibrium curves were plotted. Mention is also made of a number of methods of analysis which were attempted and proved unsatisfactory.

16. Palliser Rockslide cosmogenic 36Cl exposure ages (raw data) and erosion effect on the cosmogenic - Sturzenegger, Matthieu; Stead, Doug; Gosse, John; Ward, Brent; Froese, Corey
This paper presents the results of a combined study, using cosmogenic 36Cl exposure dating and terrestrial digital photogrammetry, of the Palliser Rockslide located in the southeastern Canadian Rocky Mountains. This site is particularly well-suited to demonstrate how this multi-disciplinary approach can be used to differentiate distinct rocksliding events, estimate their volume, and establish their chronology and recurrence interval. Observations suggest that rocksliding has been ongoing since the late Pleistocene deglaciation. Two major rockslide events have been dated at 10.0 ± 1.2 kyr and 7.7 ± 0.8 kyr before present, with failure volumes of 40 Mm3 and 8 Mm3, respectively. The...

17. Estudio del transporte de energía en plasma de fusión termonuclear con medidas experimentales obtenidas del espectrometro de intercambio de carga, realizado mediante técnicas de participación remota. - Fontdecaba Climent, Josep Maria
En la investigació de la fusió termonuclear controlada per confinament magnètic es important conèixer el transport d'energia en els plasmes, doncs aquest transport és el que fa que es refredi més o menys ràpidament amb el que s'obtindran o no les reaccions de fusió. El transport d'energia en els plasmes es majoritàriament turbulent o anòmal, fins la data no hi ha una teoria que expliqui satisfactòriament aquest tipus de transport, por tant per poder realitzar estudis i extrapolacions s'utilitzen models semiempírics en codis de simulació validats. Un d'aquests codis de simulació és PRETOR-Stellarator, utilitzat i millorat durant la realització d'aquesta...

18. Radiation Transport Modelling in a Tokomak Plasma: Application to Performance Prediciton and Design of Future Machines - Albajar Viñas, Ferran
The understanding and modelling of heat and radiation transport in tokamak plasmas is essential in order to progress in the development of thermonuclear fusion towards a practical energy source which meets all the future needs of environment, safety, and fuel inexhaustibility. This activity enables prospective studies and design to be carried out for next step tokamaks. Due to the complexity of the exact calculation, synchrotron losses are usually estimated in such studies, with expressions derived from a plasma description using simplifying assumptions on the geometry, radiation absorption, density and temperature profiles. In this thesis, a complete formulation of the transport...

19. Simulación de plasmas de dispositivos de fusión por confinamiento magnético tipo tokamak y stellarator. Validación experimental y aplicación al estudio del Heliac Flexible TJ-II - Fontanet Saez, Joan
En el estudio de la fusión por confinamiento magnético es crucial conocer con detalle las condiciones físicas del plasma confinado. En este sentido los códigos de simulación son una herramienta muy útil para interpretar las propiedades del plasma. A lo largo de esta tesis se ha estudiado las propiedades del plasma de tokamaks y stellarators y se ha contribuido al desarrollo del código de transporte PRETOR, creado en el JET. Estos estudios se han realizado dentro de la colaboración existente entre el DFEN de la UPC y el Laboratorio Nacional de Fusión del CIEMAT.El código PRETOR permite simular la variación...

20. The reaction D(γp)n at intermediate energies - Annand, J.R.M.; Anthony, I.; Crawford, G.I.; Dancer, S.N.; Hall, S.J.; Kellie, J.D.; McGeorge, J.C.; McPherson, A.; MacGregor, I.J.D.; Owens, R.O.; Wallace, P.; Schoch, B.; Vogt, J.; Beck, R.; Branford, D.; Springham, S.
Photodisintegration of the deuteron is an attractive reaction for detailed study since it is susceptible to calculation without approximations necessary in many body problems. The D-> np amplitude is sensitive to the nature of the NN interaction and to non-nucleonic components of the deuteron wavefunction. However, existing measurements of the cross section vary by 40% in the intermediate energy region. We intend to present results of a measurement of the differential cross se for the D(gaamma,p) reaction with an accuracy of +-4% over the energy range 80 to 130 MeV.

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