Navegação por Assunto "Fisica subatomica"
Resultados 1-18 de 18
-
Comparison of quasifree (p, 2p) with (p, pn) scattering as a check of the impulse approximation
(1979) [Artigo de periódico]It is shown that the ratio o f the cross sections o f quasifree (p ,Zp) and (p ,pn) reactions in complex nuclei for identical and suitable geometries can be reliably calculated in the distorted wave impulse approximation. ... -
Compatibility of the nuclear shell and nucleon bag models
(1987) [Artigo de periódico]It is shown that the standard self-consistency argument, reconciling the nuclear independentparticle model with the large low-energy nucleon-nucleon cross sections, loses its validity for nucleon bags with a radius larger ... -
A dependência de spin e isospin em reação quase-livres (p, pN)
(1981) [Tese]A aproximação de impulso (AI) é utilizada em reações nucleares, nas quais, essencialmente, um núcleon nuclear participa, enquanto os demais são praticamente espectadores passivos. Sua suposição básica consiste em considerar ... -
Efeitos de superposição em sistema de sólitons
(1991) [Dissertação]Quando os núcleons ligados num núcleo se sobrepõem, a sua estrutura interna influencia as propriedades nucleares. Em especial, a estatística dos quanta elementares que constituem o núcleon se torna relevante. No intuito ... -
Effective polarization in quasi-free scattering
(1980) [Artigo de periódico]A simple relation, involving only experimental quantmes, for the effective polarizations m quasi-free (p, 2p) scattering on closed shell nuclei IS tested for recent TRIUMF (p, 2p) experiments with 200 MeV polanzed protons. -
Uma estimativa relativística das energias de partícula-única do hipernúcleo 16 (sigma) O
(1982) [Dissertação]Neste trabalho usamos uma descrição relativística via troca de mésons em aproximação de campo médio para estimar as energias de partícula-única do hipernúcleo 16∑O. Embora o método usado seja bastante simples, comparado ... -
Estudo comparativo de reações quase-livres (p, 2p) e (p e pn)
(1979) [Dissertação]A descrição de muitas reações nucleares a energias intermediárias, entre estas as reações quase-livres, e as informações nucleares delas deduzidas estão baseadas na aproximação de impulso. Por isso é importante se ter uma ... -
Investigation of nuclear structure by quasi-free scattering with polarized protons
(1981) [Artigo de periódico]Quasi-free scattering with polarized protons can be a sensitive method to probe certain spin correlations in the nuclear wave function. This is demonstrated by the comparison of the effective polarizations following from ... -
Kn scattering in the cloudy bag model : s, p and d waves
(1985) [Artigo de periódico]s-, p-, and d-wave KN phase shifts are calculated with the cloudy bag model (CBM). The results are in qualitative agreement with phase-shift analysis, except in those partial waves where exotic resonances are claimed to ... -
Larguras de estados de buraco nucleares em um modelo relativístico
(1989) [Tese]Desde a década passada tem havido muito interesse no tratamento relativístico de sistemas nucleares. Uma rica variedade de problemas tem sido investigada usando modelos de teoria de campos relativística que incorporam as ... -
Medium effects on spin observables of proton knockout reactins
(1995) [Artigo de periódico]Medium modifications of the properties of bound nucleons and mesons are investigated by means of intermediate energy quasifree proton knockout reactions with polarized incident protons, by comparison of quantities which ... -
Nonlocality of the propagation and the effective nucleos spinorbit interaction
(1982) [Artigo de periódico]The imaginary central and spin-orbit components of the .1.-nucleus optical potential are investigated in a 11'-exchange model. It is found that the effective spin-orbit interaction of the isobar reflects lárge nonlocalities ... -
Nuclear densities and the statistics of nucleonic constituents
(1994) [Artigo de periódico]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 ... -
Quasi-free scattering of polarized electrons by polarized nuclear protons
(1977) [Artigo de periódico]It Is shown that quasi-free electron scattering in a suitable geometry takes place on strongly polarized nuclear protons. A calculation for the single particle model of 160 predicts large asymmetries for the scattering of ... -
Rho rho/sup -/ annihilation into pi/sup +/ pi/sup -/ pi/sup 0/ in a hadron-exchange model
(1997) [Artigo de periódico]Proton-antiproton annihilation into three pions is studied in a hadron-exchange model. An uncorrelated three-pion channel is added to the two-meson channels considered in previous calculations. Initial-state interactions ... -
Rotating Skyrmion in 2+1 dimensions
(1996) [Artigo de periódico]The collective rotation of the Skyrmion in two-dimensional space is considered. In contradistinction to the three-dimensional case, inertial effects do not spoil the hedgehog form and can, therefore, be investigated ... -
S-wave meson-nucleon scattering in an su(3) cloudy bag model
(1985) [Artigo de periódico]The cloudy bag model (CBM) is extended to incorporate chiral SU(3)XSU(3) symmetry, in order to describe 5-wave KN and KN scattering. In spite of the large mass of the kaon, the model yields reasonable results once the ... -
Vizualização do movimento do centro de massa
(1995) [Resumo publicado em evento]
