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Nomenclatura Unesco > (22) Física > (2207) Física atómica y nuclear
(2207.01) Haces atómicos (2207.02) Iones atómicos
(2207.03) Física atómica (2207.04) Atomos con Z mayor que 2
(2207.05) Procesos de colisión (2207.06) Haces de electrones
(2207.07) Resonancia paramagnética electrónica (2207.08) Resonancia de spín electrónico
(2207.09) Conversión de energía (2207.10) Fisión (nuclear)
(2207.11) Átomo de helio (2207.12) Átomo de hidrógeno
(2207.13) Isótopos (2207.14) Desintegración nuclear
(2207.15) Energía nuclear (2207.16) Resonancia magnética nuclear
(2207.17) Reacción nuclear y dispersión (2207.18) Reactores nucleares
(2207.19) Estructura nuclear (2207.20) Radioisótopos
(2207.21) Fusión termonuclear (2207.90) Física nuclear experimental bajas energías
(2207.99) Otras (especificar)

Categorías relacionadas:
(3320) Tecnología nuclear

Mostrando recursos 1 - 20 de 55

1. Processing of spectrally resolved x-ray images of inertial confinement fusion implosion cores recorded with multimonochromatic x-ray imagers - Nagayama, T.; Mancini, R.; Florido, R.; Tommasini, R.; Koch, J. A.; Delettrez, J. A.; Regan, S.P.; Smalyuk, V. A.
[EN] We discuss the processing of data recorded with multimonochromatic x-ray imagers (MMI) in inertial confinement fusion experiments. The MMI records hundreds of gated, spectrally resolved images that can be used to unravel the spatial structure of the implosion core. In particular, we present a new method to determine the centers in all the array of images, a better reconstruction technique of narrowband implosion core images, two algorithms to determine the shape and size of the implosion core volume based on reconstructed broadband images recorded along three-quasiorthogonal lines of sight, and the removal of artifacts from the space-integrated spectra.

2. La radiactividad que nos rodea - Martel Escobar, Pablo
[ES]La radiactividad es un fenómeno que se origina en los núcleos atómicos. Es un proceso espontáneo por el cual unos núcleos inestables se transforman en otros más estables, emitiendo radiación electromagnética muy energética o pequeñas partículas cargadas que tienen la propiedad de arrancar electrones de los átomos que constituyen la materia sobre la que inciden, pudiendo, de este modo, modificar las propiedades químicas de la misma. Esta emisión, llamada radiación ionizante, junto con los propios núcleos radiactivos inundan nuestro hábitat y a sus efectos estamos expuestos por el simple hecho de vivir en el planeta. Su origen puede ser natural...

3. (c) Departamento de Fisica Atomica, Molecular y Nuclear - V. R. Manfredi (a)(b; L. Salasnich (a)(c; Facultad De Ciencias Fisicas; Ciudad Universitaria
This work has been partially supported by the Ministero della Università e della

4. a Departamento de Física Atómica, Molecular y Nuclear, - C. H. Dasso A; L. Fortunato B; E. G. Lanza C; A. Vitturi B
The interplay of nuclear and Coulomb processes in the inelastic excitation of singleand double-phonon giant resonances in heavy ion collisions is studied within a simple reaction model. Predominance of the Coulomb excitation mechanism on the population of the single-phonon and, on the contrary, predominance of the nuclear excitation for the double-phonon is evidenced. The effect of the spreading of the strength distribution of the giant resonances on the excitation process is analyzed, showing sizeable modifications in the case of Coulomb dominated processes.

5. b Departamento de Fisica Atomica, Molecular y Nuclear, - A. N. Antonov A; M. K. Gaidarov A; D. N. Kadrev A; Facultad De Ciencias Fisicas
density distributions and related form factors in neutron-rich light exotic nuclei

6. Departamento de Física Atómica, Molecular y Nuclear, Universidad de Sevilla, - F. Catara B
Excitation of multiple giant dipole resonances: from spherical to deformed nuclei

7. Departamento de Física Atómica, Molecular y Nuclear - J. E. Amaro; M. B. Barbaro; J. A. Caballero; T. W. Donnelly; A. Molinari
correlations

8. Departamento de Física Atómica, Molecular y Nuclear - J. E. Amaro; M. B. Barbaro; J. A. Caballero; T. W. Donnelly
Relativistic effects in electromagnetic nuclear responses in the quasi-elastic delta region

9. Departamento de Física Atómica, Molecular y Nuclear - J. E. Amaro; M. B. Barbaro; J. A. Caballero; T. W. Donnelly
electron scattering

10. aDepartamento de Física Atómica, Molecular y Nuclear, Universidad Complutense de - J. M. Udias; J. A. Caballero; E. Moya De Guerra; J. E. Amaro; T. W. Donnelly
Predictions for electron induced proton knockout from the p 1/2 and p 3/2 shells in 16 O are presented using various approximations for the relativistic nucleonic current. Results for the differential cross section, transverse-longitudinal response (RTL) and left-right asymmetry ATL are compared at |Q2 | = 0.8 (GeV/c) 2 corresponding to TJNAF experiment 89-003. We show that there are important dynamical and kinematical relativistic effects which can be tested by experiment. PACS: 25.30.Fj; 25.30.Rw; 24.10.-i; 21.60.Cs Keywords: Quasielastic electron scattering; Negative-energy components; Transverse-longitudinal response; Left-right asymmetry. Under quasielastic conditions the (e, e ′ p) reaction can be treated with confidence...

11. Spectral Statistics in Large Shell Model Calculations 1 J.M.G. Gómez Departamento de Fisica Atómica, Molecular y Nuclear, - Facultad De Ciencias Fisicas; V. R. Manfredi; L. Salasnich
The spectral statistics of low–lying states of fp shell nuclei are studied by performing large shell–model calculations with a realistic nuclear interaction. For Ca isotopes, we find deviations from the predictions of the random–matrix theory which suggest that some spherical nuclei are not as chaotic in nature as the conventional view assumes. 1.

12. Departamento de Física Atómica, Molecular y Nuclear,
Abstract: The spectral statistics of low–lying states of several fp shell nuclei are studied with realistic shell–model calculations. For Ca isotopes, we find significant deviations from the predictions of the random–matrix theory which suggest that some spherical nuclei are not as chaotic in nature as the conventional view assumes. PACS numbers: 21.10.-k, 21.60.Cs, 24.60.Lz

13. Departamento de Física Atómica, Molecular y Nuclear - J. E. Amaro; M. B. Barbaro; J. A. Caballero; T. W. Donnelly
Delta-isobar relativistic meson exchange currents in quasielastic electron scattering

14. Departamento de Fisica Atomica, Molecular y Nuclear - V. R. Manfredi (a; L. Salasnich (d; S. Taddei (b)(c
This work has been partially supported by the Ministero dell’Università e della Ricerca

15. Departamento de Física Atómica, Molecular y Nuclear, Universidad de - J. A. Caballero; M. C. Martínez; T. W. Donnelly; E. Moya De Guerra; J. M. Udías; J. R. Vignote
Abstract. Coincidence scattering of polarized electrons from nuclei with polarization transfer to outgoing nucleons is studied within the context of relativistic mean field theory. Effects introduced by the dynamical enhancement of the lower components of the bound and scattered nucleon wave functions are analyzed for the polarized response functions and transferred polarization asymmetries. Results obtained by projecting out the negative-energy components are compared with the fully-relativistic calculation. The crucial role played by the relativistic dynamics in some spin-dependent observables is clearly manifested even for low/medium values of the missing momentum. Kinematical relativistic effects are also analyzed. A discussion of the...

16. Departamento de Física Atómica, Molecular y Nuclear, Universidad de - J. A. Caballero; M. C. Martínez; T. W. Donnelly; E. Moya De Guerra; J. M. Udías
Abstract. Coincidence scattering of polarized electrons from nuclei with polarization transfer to outgoing nucleons is studied within the context of relativistic mean field theory. Effects introduced by the dynamical enhancement of the lower components of the bound and scattered nucleon wave functions are analyzed for the polarized response functions and transferred polarization asymmetries. Results obtained by projecting out the negative-energy components are compared with the fully-relativistic calculation. The crucial role played by the relativistic dynamics in some spin-dependent observables is clearly manifested even for low/medium values of the missing momentum. Kinematical relativistic effects are also analyzed. A discussion of the...

17. Departamento de Física Atómica, Molecular y Nuclear - J. E. Amaro; M. B. Barbaro; J. A. Caballero; T. W. Donnelly; A. Molinari
correlations

18. Departamento de Fisica Atomica, Molecular y Nuclear - Facultad De Ciencias Fisicas
We study the classical chaos–order transition in the spatially homogenous SU(2) Yang–Mills–Higgs system by using a quantal analog of Chirikov’s resonance overlap criterion. We obtain an analytical estimation of the range of parameters for which there is chaos suppression.

19. and Departamento de Fisica Atomica, Molecular y Nuclear - Luca Salasnich; Facultad De Ciencias Fisicas; Ciudad Universitaria
The presence of chaos and quantum chaos is shown in two different nuclear systems. We analyze the chaotic behaviour of the classical SU(2) Yang–Mills– Higgs system, and then we study quantum chaos in the nuclear shell model calculating the spectral statistics of A = 46–50 atomic nuclei. 1.

20. Departamento de Física Atómica, Molecular y Nuclear - J. E. Amaro; M. B. Barbaro; J. A. Caballero; T. W. Donnelly; A. Molinari
A set of fully relativistic one-pion-exchange electromagnetic operators is developed for use in one-particle emission reactions induced by electrons. To preserve the gauge invariance of the theory additional pionic correlation operators are required beyond the usual meson-exchange current operators. Of these, in the present work emphasis is placed on the self-energy current which is infinite and needs to be renormalized. The renormalized current is expanded to first order to obtain a genuine one-pion-exchange contribution to the inclusive responses.

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