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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 416

1. General Description of Fission Observables: GEF Model Code - Schmidt, Karl-Heinz; Jurado, Beatriz; Amouroux, Charlotte; Schmitt, Christelle
The GEF (" GEneral description of Fission observables ") model code is documented. It describes the observables for spontaneous fission, neutron-induced fission and, more generally, for fission of a compound nucleus from any other entrance channel, with given excitation energy and angular momentum. The GEF model is applicable for a wide range of isotopes from Z = 80 to Z = 112 and beyond, up to excitation energies of about 100 MeV. The results of the GEF model are compared with fission barriers, fission probabilities, fission-fragment mass-and nuclide distributions, isomeric ratios, total kinetic energies, and prompt-neutron and prompt-gamma yields and...

2. Microwold 20. “Spontaneous ” Nuclear Disintegration - N. N. Leonov
“Spontaneous ” nuclear disintegration results from increase in the density of ether in the contemporary Universe. Red shift is indicative of increase in the density of ether in the peripheral regions of the Universe. The observable phenomenon of “spontaneous ” nuclear disintegration provides experimental evidence of the fact that increase in the density of ether in the contemporary Universe takes place in the entire Universe rather in its peripheral layers. It is common knowledge that atomic nuclei of a number of chemical elements are capable of being disintegrated by external influence into various fragments from single nucleons to different nucleonic...

3. Real time processing of neutron monitor data using the edge editor algorithm - Mavromichalaki Helen; Paschalis Pavlos
The nucleonic component of the secondary cosmic rays is measured by the worldwide network of neutron monitors (NMs). In most cases, a NM station publishes the measured data in a real time basis in order to be available for instant use from the scientific community. The space weather centers and the online applications such as the ground level enhancement (GLE) alert make use of the online data and are highly dependent on their quality. However, the primary data in some cases are distorted due to unpredictable instrument variations. For this reason, the real time primary data processing of the measured...

4. Dense nucleonic matter and the renormalization group - Drews Matthias; Hell Thomas; Klein Bertram; Weise Wolfram
Fluctuations are included in a chiral nucleon-meson model within the framework of the functional renormalization group. The model, with parameters fitted to reproduce the nuclear liquid-gas phase transition, is used to study the phase diagram of QCD. We find good agreement with results from chiral effective field theory. Moreover, the results show a separation of the chemical freeze-out line and chiral symmetry restoration at large baryon chemical potentials.

5. The detection of solar proton produced 14CO - P. Jöckel; C. A. M. Brenninkmeijer; M. G. Lawrence; P. Siegmund
Major solar eruptions (coronal mass ejections) are accompanied by massive ejections of protons. When these charged particles head for the Earth through the interplanetary magnetic field with high flux and energy, a solar proton event (SPE) is recorded. Strong SPEs, in which energetic protons penetrate the atmosphere in large numbers are rare, but do have chemical effects (Crutzen, 1975; Jackman et al., 1990, 2001).  They also have nucleonic effects by which they can almost instantaneously increase the atmospheric production of radio-nuclides, including 14C (radiocarbon), but this has never been demonstrated. We show, using satellite observations and modeling, that the 2nd...

6. From crystalline to exotic arrangements of matter in neutron star crusts - Figerou S.; Sébille F.; de la Mota V.; Eudes Ph.
We investigate the occurrence of exotic structures in the outermost layers of neutron stars within the framework of a microscopic model describing the nucleonic dynamics through a time-dependent mean field approach at around zero temperature. In this model starting from an initial crystalline lattice of nuclei at subnuclear densities the system evolves and self-organizes in various low-lying energy structures without assumption of final shapes. These structures are studied in terms of a density phase diagram. We investigate their sensitivity to the isotopic composition and to the symmetries of the lattice.

7. Atmospheric electric field effects of cosmic rays detected in Mexico City - J. F. Valdés-Galicia; L. X. González
We studied the possible effects of atmospheric electric fields, generated in thunderstorms, on the cosmic ray intensity detected at the Earth’s surface by investigating the variations of the counting rates of the cosmic-ray nucleonic component, obtained from the neutron monitor installed in Mexico City, for thunderstorms during 1996 and 1997. These were years of minimum solar activity. We compare our experimental results with the general theory of cosmic ray meteorological effects by Dorman (1995).The observed intensity variation is about 0.2%. According to Dorman (1995), the effect should be between 0.27% and 0.81% on the counting rate of the neutron monitor...

8. Electroweak reactions with light nuclei - Bacca S.
The investigation of light nuclei with ab-initio methods provides an optimal setting to probe our knowledge on nuclear forces, because the few-nucleon problem can be solved accurately. Nucleons interact not only in pairs but also via many-body forces. Theoretical efforts need to be taken towards the identification of nuclear observables sensitive to the less known many-nucleon forces. Electromagnetic reactions can potentially provide useful information on this. We present results on photo-absorption and electron scattering off light nuclei, emphasizing the role of three-body forces and the comparison with experimental data. On the other hand, reactions induced by weak probes, like neutrino...

9. Nuclear stopping for heavy-ion induced reactions in the Fermi energy range : from 1-Body to 2-Body dissipation - Lopez O.; Lehaut G.; Durand D.; Aouadi M.
We study the stopping in heavy-ion induced reactions around the Fermi energy in central collisions. The stopping is minimal around the Fermi energy and corresponds to the crossover between the Mean-Field and the nucleonic regimes. This is attributed to the change in the energy dissipation going from 1-body (Mean-Field) to 2-body (nucleonnucleon collisions) dissipation. For this latter, a connection to in-medium transport properties of nuclear matter is proposed and comprehensive values of the nucleon mean free path and nucleon-nucleon cross section are extracted.

10. CONTROL OF ACTIVATORS OF SHARP INTESTINAL INFECTIONS OVER BASIS PCR-RT Контроль возбудителей острых кишечных инфекций на основе ПЦР-РТ - Brovkina A. N.
The "multiplex" PCR technique in a combination with automatic extraction of nucleonic acids allows to carry out the control of activators of sharp intestinal infections of the bacterial and virus nature over objects of an environment with high speed, specificity and sensitivity

11. Neutron spectroscopic factors of 55Ni hole-states from (p,d) transfer reactions - A. Sanetullaev; M.B. Tsang; W.G. Lynch; Jenny Lee; D. Bazin; K.P. Chan; D. Coupland; V. Henzl; D. Henzlova; M. Kilburn; A.M. Rogers; Z.Y. Sun; M. Youngs; R.J. Charity; L.G. Sobotka; M. Famiano; S. Hudan; D. Shapira; W.A. Peters; C. Barbieri; M. Hjorth-Jensen; M. Horoi; T. Otsuka; T. Suzuki; Y. Utsuno
Spectroscopic information has been extracted on the hole-states of 55Ni, the least known of the quartet of nuclei (55Ni, 57Ni, 55Co and 57Cu), one nucleon away from 56Ni, the N=Z=28 double magic nucleus. Using the H1(Ni56,d)Ni55 transfer reaction in inverse kinematics, neutron spectroscopic factors, spins and parities have been extracted for the f7/2, p3/2 and the s1/2 hole-states of 55Ni. These new data provide a benchmark for large basis calculations that include nucleonic orbits in both the sd and pf shells. State of the art calculations have been performed to describe the excitation energies and spectroscopic factors of the s1/2...

12. Neutron–proton effective mass splitting in neutron-rich matter at normal density from analyzing nucleon–nucleus scattering data within an isospin dependent optical model - Xiao-Hua Li; Wen-Jun Guo; Bao-An Li; Lie-Wen Chen; Farrukh J. Fattoyev; William G. Newton
The neutron–proton effective mass splitting in asymmetric nucleonic matter of isospin asymmetry δ and normal density is found to be mn−p⁎≡(mn⁎−mp⁎)/m=(0.41±0.15)δ from analyzing globally 1088 sets of reaction and angular differential cross sections of proton elastic scattering on 130 targets with beam energies from 0.783 MeV to 200 MeV, and 1161 sets of data of neutron elastic scattering on 104 targets with beam energies from 0.05 MeV to 200 MeV within an isospin dependent non-relativistic optical potential model. It sets a useful reference for testing model predictions on the momentum dependence of the nucleon isovector potential necessary for understanding novel...

13. Quantum Physics Status - N. N. Leonov
Quantum physics is an approximate theory of the microworld. Its application is limited due to refusal to consider ether resistance to motion of microobjects and negligence of magnetic interactions among the same. Quantum physics is considered to be an unprecedentedly revolutionary and extremely effective means of the material world perception. It seems to be confirmed by the practical results it achieved. But the year 1979 saw publication [l] of findings meaning that nuclei of all chemical elements have quasicrystalline structures. In other words the nucleonic systems of such nuclei feature stable statically equilibrium configurations. The findings imply that ħ=0 in...

14. Exclusive Study of Deuteron Electrodisintegration near Threshold - G. D. Cates; R. Lindgren; N. Liyanage; V. Nelyubin; B. E. Norum; K. Paschke; L. C. Smith; K. Wang; X. Zheng; 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; O. Hansen; D. W. Higinbotham; J. Lerose
Elastic electron scattering from the deuteron and near-threshold electro-disintegration 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 ambi-guity. We propose to make similar improvements in the constraints imposed by electrodisintegration with an exclusive study of the reaction d(~e; e0p)n at Q2 = 12 fm2 and Enp = 2, 4, 6, 8 MeV. Under these kinematics, non-nucleonic as well as nucleonic degrees of freedom and relativistic eects are expected to play major roles. The experiment will be conducted in Hall...

15. Microwold 20. “Spontaneous ” Nuclear Disintegration - N. N. Leonov
“Spontaneous ” nuclear disintegration results from increase in the density of ether in the contemporary Universe. Red shift is indicative of increase in the density of ether in the peripheral regions of the Universe. The observable phenomenon of “spontaneous ” nuclear disintegration provides experimental evidence of the fact that increase in the density of ether in the contemporary Universe takes place in the entire Universe rather in its peripheral layers. It is common knowledge that atomic nuclei of a number of chemical elements are capable of being disintegrated by external influence into various fragments from single nucleons to different nucleonic...

16. New Directions in Quantum - Stanley J. Brodsky
I review the light-cone Fock state represention and its associated light-cone fac-torization scheme as a method for encoding the avor, momentum, and helicity prop-erties of hadrons in the form of universal process-independent and frame-independent amplitudes. Discrete light-cone quantization (DLCQ) provides a matrix representa-tion of the QCD Hamiltonian and a nonperturbative method for computing the quark and gluon bound state wavefunctions. A number of applications of the light-cone for-malism are discussed, including an exact light-cone Fock state representation of semi-leptonic B decay amplitudes. Hard exclusive and diractive reactions are shown to be sensitive to hadron distribution amplitudes, the valence Fock state...

17. Tag der Promotion: 13.11.2003 - Vom Fachbereich Physik; Der Universität Hannover; Doktor Der Naturwissenschaften; Korreferent Prof; Dr. D. Zawischa
The description of few-nucleon systems in terms of a two-nucleon potential and a corresponding electroweak current of one- and two-nucleon nature has been quite successful in general. Disagreements remain in detail. They are indicators for necessary corrections of the employed dynamics. The standard hypothesis for resolving those disagreements is the addition of a three-nucleon potential to the Hamiltonian and of corresponding parts to the electroweak exchange current. This thesis follows that idea in a particular way: Beside nucleons the D-isobar degree of freedom is considered explicitly in the description, i.e., in the Hilbert space and by use of a two-baryon...

18. physics pp. 519–524 Physics with loosely bound nuclei - Chhanda Samanta
Abstract. The essential aspect of contemporary physics is to understand properties of nucleonic matter that constitutes the world around us. Over the years research in nuclear physics has provided strong guidance in understanding the basic principles of nuclear interactions. But, the scenario of nuclear physics changed drastically as the new generation of accelerators started providing more and more rare isotopes, which are away from the line of stability. These weakly bound nuclei are found to exhibit new forms of nuclear matter and unprecedented exotic behaviour. The low breakup thresholds of these rare nuclei are posing new challenges to both theory...

We present here the concept of the proposed gamma-ray beam line for the ALBA synchrotron light source to be built near Barcelona. The gamma-rays are produced by Compton backscattering of laser light from the ring electrons. Without affecting the machine performance it will be possible to produce high intensity beams with energies up to 500 MeV. The beam is focused naturally and is easily polarized. The beam energy can be defined by collimation at the lower energies and by internal tagging at high energies. Such gamma-ray beams can be used to study photo-nuclear processes of interest in basic nuclear physics,...

20. COSMIC RAY EVENT ASSOCIATED WITH THE JANUARY 10, 1997 MAGNETIC STORM - M. Storini; S. Massetti; G. Moreno; E. G. Cordaro
We investigate the trend of the nucleonic intensity of the cosmic rays during the large geomagnetic storm occurred on January 10, 1997, in connection with the disappearance of a Hα filament on the Sun. We present also the results of a statistical analysis based on cosmic ray and solar soft X-ray observations performed during 10 storms, similar to the January 10 event, occurred during a period of high solar activity (January 1969-

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