Il Nuovo Cimento A (1965-1970)
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Some relations between coupling constants in higher symmetries
Il Nuovo Cimento A (1965-1970) - - 1966
Minimal surfaces and strings from spinors a realization of the cartan programme
Il Nuovo Cimento A (1965-1970) - Tập 96 - Trang 194-211 - 2008
It is shown ow the old Enneper-Weierstrass integral parametrization ofminimal surfaces inR
3 and the Eisenhart ones inR
3,1, when expressed through bilinear spinor polynomia, may be considered as deriving from a particularlocal realization of the possibility envisaged by Cartan: to consider ordinary vectors as generated from isotropic planes in complex spaces, in the frame of the bijective Cartan ...... hiện toàn bộ
Meson-meson scattering amplitudes in the modifiedK-matrix formalism
Il Nuovo Cimento A (1965-1970) - - 1977
Small oscillations in a nuclear Vlasov fluid
Il Nuovo Cimento A (1965-1970) - Tập 87 - Trang 174-188 - 2008
We present a semi-classical approach to the dynamics of nuclear collective motions. We study a linearized version of the nuclear Vlasov equation, obtained from a phase-space representation of a meanfield theory, which corresponds to a semi-classical version of the RPA approach. Giant resonances are shown to be quite well described as scaling modes, which are equivalent to a lowest multipole (up to...... hiện toàn bộ
Commutation relations among members of internal-symmetry multiplets
Il Nuovo Cimento A (1965-1970) - - 1968
Deuteron-nucleus scattering atE d=34 and 80 MeV
Il Nuovo Cimento A (1965-1970) - Tập 105 - Trang 1767-1772 - 2007
34 and 80 MeV deuterons scattered elastically from some nuclei between12C and208Pb are analysed using the 3-parameter strong-absorption model due to Frahn and Venter. The interaction radius, surface diffuseness and the reaction cross-section have been determined from the best-fit values ofT, Δ andμ. The inelastic scattering of deuterons from even-even nuclei12C,58Ni,68Zn and120Sn exciting to 2+ st...... hiện toàn bộ
Practical formulation of the isobar model
Il Nuovo Cimento A (1965-1970) - Tập 45 - Trang 559-587 - 2016
Calcul de l'amplitude de transition pour des réactions du type
$$\pi \mathcal{N} \to \pi \pi \mathcal{N}$$
ou
$$K - p \to \pi \pi \Lambda $$
dans le cas où les particules intéragissent seulement deux à deux dans l'état final. Le...... hiện toàn bộ
Significance of constraints associated with Green’s functions in Hamiltonian perturbation theory
Il Nuovo Cimento A (1965-1970) - Tập 97 - Trang 535-556 - 2008
In many formulations of Hamiltonian perturbation theory a Green’s function becomes undefined when some parameter is allowed to vanish. Here various examples are discussed to illustrate this phenomenon, and it is shown that they are all realizations of a general theorem. The cases considered are examples in classical mechanics, quantum mechanics, electrodynamics and field theory. The prime object i...... hiện toàn bộ
Coherent neutrino scattering—Relativistic and nonrelativistic
Il Nuovo Cimento A (1965-1970) - Tập 83 - Trang 263-274 - 2008
Coherent detection techniques are being studied both for relativistic neutrinos (e.g. MeV-range solar, orm
υ < 10−4 eV «relic» neutrinos) and for nonrelativistic neutrinos (e.g. 1 eV ... hiện toàn bộ
On the vacuum structure of the Schwinger model
Il Nuovo Cimento A (1965-1970) - Tập 47 - Trang 151-165 - 2007
We discuss the generators σ of the vacuum structure of the Schwinger model. In the Lowenstein-Swieca gauge, we identify these operators with intertwining operators between different charge sectors of a free, massless spinor field ψ and use them as approximations for new operators σ∞ on an enlarged ψ Fock space. The σ∞'s generate states which are vacua with respect to the ψ Hamiltonian and their co...... hiện toàn bộ
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