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Nomenclatura Unesco > (22) Física > (2208) Nucleónica
(2208.01) Manipulación de haces (2208.02) Fuentes de haces
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Mostrando recursos 1 - 20 de 396

1. 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...

2. 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

3. 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

4. ENERGY RESEARCH AND DEVELOPMENT ADMINIsTRATION - Donald J. Dudziak; Sa Iamos; Donald J. Dudziak
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5. ENERGY RESEARCH AND DEVELOPMENT ADMINIsTRATION - Donald J. Dudziak; Sa Iamos; Donald J. Dudziak
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6. 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...

7. 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...

9. 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...

10. 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.

11. 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...

12. 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...

13. 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...

14. 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...

15. 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.

16. Deuteron Electro-Disintegration at Very High Missing Momenta - K. Aniol; F. Benmokhtar; W. U. Boeglin (spokesperson; P. E. Markowitz; B. A. Raue; J. Reinhold; M. Sargsian; M. Kohl; D. Gaskell; D. Higinbotham; M. K. Jones (co-spokesperson; G. Smith; S. Wood; S. Jeschonnek; J. W. Van Orden; G. Huber; E. Piasetzky; G. Ron; R. Shneor; H. Bitao; X. Jiang; A. Puckett; S. Danagoulian; H. Baghdasaryan; D. Day; N. Kalantarians; R. Subedi; F. R. Wesselmann; A. Asaturyan; A. Mkrtchyan; H. Mkrtchyan; V. Tadevosyan; S. Zhamkochyan
High-energy, exclusive electro-disintegration of the deuteron at missing momenta up to ≈ 1 GeV/c is considered as the most effective process to probe two nucleon dynamics at short space time distances. The latter condition is essential for probing the limits of nucleonic degrees of freedom in strong interaction dynamics. These are the distances at which the repulsive core of the strong interaction becomes dominant and a host of new dynamical effects such as the role of the non-nucleonic components and the transition from hadronic to quark-gluon degrees of freedom become increasingly important. 1.1 Importance of these studies for the field...

17. Exclusive Study of Deuteron Electrodisintegration near Threshold - G. D. Cates; R. Lindgren; N. Liyanage; V. Nelyubin; B. E. Norum; K. Paschke; L. C. Smith; R. Subedi; K. Wang; X. Zheng; W. Bertozzi; S. Gilad; B. Moffit; N. Sparveris; H. Arenhövel; M. Schwamb; B. Sawatzky; R. Igarashi; R. Pywell; G. Rosner; D. Watt; X. Jiang; J. Calarco; Y. Jiang; H. Lu; J. Shen; X. Yan; Y. Ye; Z. Yin; P. Zhu; J. P. Chen; J. -o. Hansen; D. W. Higinbotham; J. Lerose; V. Sulkosky
Elastic electron scattering from the deuteron and near-threshold electrodisintegration have long provided benchmarks against which models of the nucleon-nucleon interaction are evaluated. Recent measurements of T20 in elastic scattering have tightened the constraints but still leave room for ambiguity. We propose to make similar improvements in the constraints imposed by electrodisintegration with an exclusive study of the reaction d(e, e ′ p)n at Q 2 = 12 fm −2 and Enp = 2, 4, 6, 8 MeV. Under these kinematics, nonnucleonic as well as nucleonic degrees of freedom and relativistic effects are expected to play major roles. The experiment will...

18. Proposal to PAC-16 Hall A, Je erson Lab Isolation of SRC in the 3 He(e � e 0 pp)nsp Reaction Driven by One-Body Currents - K. Benslama; E. J. Brash; S. Dumalski; A. Fleck; G. M. Huber; N. Knecht; G. J. Lolos; K. Papageorgiou; Z. Pap; A. Shinozaki; K. Aniol; M. Epstein; D. Margaziotis; D. Meekins; R. Roche; A. J. Sarty; R. Gilman; C. Glasshauser; G. Kumbartzki; R. Ransome; S. Strauch; X. Xiang; M. Kuss; J. Templon; P. Ulmer
We propose a surgical measurement of short-range correlations (SRC), in inelastic electron scattering via the two proton knockout reaction 3He(e � e0pp)nsp. Such correlations have a speci c dynamical signature, in the ground state wavefunction of the target nucleus, which bridges the gap between nucleonic and quark degrees of freedom. As such, these measurements will provide severe constraints on existing theoretical models which employ realistic N-N potentials, while at the same time providing the impetus for new calculations. Our aim will be accomplished by separately measuring the longitudinal and transverse parts of the cross section, for the rst time, as...

19. Medium Modi cations of Vector Mesons in the Subthreshold Region Participants: - G. J. Lolos; Z. Pap; E. J. Brash; G. M. Huber; K. Benslama; S. Dumalski; A. Fleck; N. Knecht; A. Shinozaki; X. Chen; P. L. Cole; A. Larabee; F. J. Klein; S. G. Stepanyan; N. Bianchi; E. De Sanctis; M. Mirazita; V. Muccifora; F. Ronchetti; P. Rossi; M. Anghinol; M. Battaglieri; P. Corvisiero; M. Ripani; M. Taiuti; K. Sh. Egiyan; G. Gavalian; Y. G. Sharabian; B. Raue; R. Lewis; R. J. Van Der Meer; A. Afanasev
We propose to investigate the subthreshold photoproduction of the three lowest mass vector mesons, V = 0,!, and mesons. In the subthreshold energy region, de ned here as the energy region below the +N! V +N reaction threshold on the free nucleon, VMD-driven vector meson production is suppressed and the in uence of hadronic matter on the masses of the vector mesons is emphasized. This method is the optimum vehicle for the study of in-medium modi cations and, speci cally for the 0 meson, experimental evidence already exists for a dramatic reduction in m o, which is dependent on the...

20. Multifragmentation in Relativistic Heavy Ion Reactions - Trautmann Gesellschaft Fur; W. Trautmann
Multifragmentation is the dominant decay mode of heavy nuclear systems with excitation energies in the vicinity of their binding energies. It explores the partition space associated with the number of nucleonic constituents and it is characterized by a multiple production of nuclear fragments with intermediate mass. Reactions at relativistic bombarding energies, exceeding several hundreds of MeV per nucleon, have been found very efficient in creating such highly excited systems. Peripheral collisions of heavy symmetric systems or more central collisions of mass asymmetric systems produce spectator nuclei with properties indicating a high degree of equilibration. The observed decay patterns are well...

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