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Search Results: 1 - 10 of 462074 matches for " Gazitúa "
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Los Andes del Sur
Gazitúa,Francisco;
ARQ (Santiago) , 2002, DOI: 10.4067/S0717-69962002005100017
Abstract: after walking several routes along and across the mountain range, the author reflects about the relation between chilean people and their most important geographic reference, the andes. what has been an empty, tough and abandoned barrier, and has also been given the back by the dwellers of the chilean territory, he vindicates it as a location that would give place to a collective consciousness
Los Andes del Sur
Francisco Gazitúa
ARQ , 2002,
Abstract: Tras más de un recorrido por la cordillera, el autor reflexiona sobre la relación del pueblo chileno con los Andes. Mediante preguntas y conclusiones se reivindica lo que ha sido históricamente una barrera despoblada, agreste y abandonada, a la cual se le da la espalda, más que un territorio con el potencial de dar cabida a todo un imaginario. After walking several routes along and across the mountain range, the author reflects about the relation between Chilean people and their most important geographic reference, the Andes. What has been an empty, tough and abandoned barrier, and has also been given the back by the dwellers of the Chilean territory, he vindicates it as a location that would give place to a collective consciousness
Intervención en feria San Rafael: La Pintana, Chile
Ricardo Gazitúa
ARQ , 2005,
Abstract:
Chiral two-body currents in nuclei: Gamow-Teller transitions and neutrinoless double-beta decay
J. Menéndez,D. Gazit,A. Schwenk
Physics , 2011, DOI: 10.1103/PhysRevLett.107.062501
Abstract: We show that chiral effective field theory (EFT) two-body currents provide important contributions to the quenching of low-momentum-transfer Gamow-Teller transitions, and use chiral EFT to predict the momentum-transfer dependence that is probed in neutrinoless double-beta decay. We then calculate for the first time the neutrinoless double-beta decay operator based on chiral EFT currents and study the nuclear matrix elements at successive orders. The contributions from chiral two-body currents are significant and should be included in all calculations.
Spin-dependent WIMP scattering off nuclei
J. Menendez,D. Gazit,A. Schwenk
Physics , 2012, DOI: 10.1103/PhysRevD.86.103511
Abstract: Chiral effective field theory (EFT) provides a systematic expansion for the coupling of WIMPs to nucleons at the momentum transfers relevant to direct cold dark matter detection. We derive the currents for spin-dependent WIMP scattering off nuclei at the one-body level and include the leading long-range two-body currents, which are predicted in chiral EFT. As an application, we calculate the structure factor for spin-dependent WIMP scattering off 129,131Xe nuclei, using nuclear interactions that have been developed to study nuclear structure and double-beta decays in this region. We provide theoretical error bands due to the nuclear uncertainties of WIMP currents in nuclei.
Large-scale nuclear structure calculations for spin-dependent WIMP scattering with chiral effective field theory currents
P. Klos,J. Menéndez,D. Gazit,A. Schwenk
Physics , 2013, DOI: 10.1103/PhysRevD.88.083516
Abstract: We perform state-of-the-art large-scale shell-model calculations of the structure factors for elastic spin-dependent WIMP scattering off 129,131Xe, 127I, 73Ge, 19F, 23Na, 27Al, and 29Si. This comprehensive survey covers the non-zero-spin nuclei relevant to direct dark matter detection. We include a pedagogical presentation of the formalism necessary to describe elastic and inelastic WIMP-nucleus scattering. The valence spaces and nuclear interactions employed have been previously used in nuclear structure calculations for these mass regions and yield a good spectroscopic description of these isotopes. We use spin-dependent WIMP-nucleus currents based on chiral effective field theory (EFT) at the one-body level and including the leading long-range two-body currents due to pion exchange, which are predicted in chiral EFT. Results for all structure factors are provided with theoretical error bands due to the nuclear uncertainties of WIMP currents in nuclei.
Bone stem cell mediated gene therapy and tissue engineering
D Gazit
Arthritis Research & Therapy , 2001, DOI: 10.1186/ar339
Abstract:
The Weak Structure of the Nucleon
Gazit D.
EPJ Web of Conferences , 2010, DOI: 10.1051/epjconf/20100301005
Abstract: The weak structure of the nucleon is the non-perturbative response of the nucleon to a weakinteracting probe. Here, I review the existing experimental data at low energy. In particular, the role of fewbody nuclear reactions in constraining the weak response of the nucleon, in vacuum and in nuclear medium, is discussed.
The Structure of Physical Crystalline Membranes within the Self-Consistent Screening Approximation
Doron Gazit
Physics , 2009, DOI: 10.1103/PhysRevE.80.041117
Abstract: The anomalous exponents governing the long wavelength behavior of the flat phase of physical crystalline membranes are calculated within a self-consistent screening approximation (SCSA) applied to second order expansion in 1/d_C (d_C is the co-dimension), extending the seminal work of Le Doussal and Radzihovsky [Phys. Rev. Lett. 69, 1209 (1992)]. In particular, the bending rigidity is found to harden algebraically in the long wavelength limit with an exponent eta=0.789..., which is used to extract the elasticity softening exponent eta_u=0.422..., and the roughness exponent zeta=0.605.... The scaling relation eta_u=2-2eta is proven to hold to all orders in SCSA. Further, applying the SCSA to an expansion in 1/d_C, is found to be essential, as no solution to the self-consistent equations is found in a two bubble level, which is the naive second order expansion. Surprisingly, even though the expansion parameter for physical membrane is 1/d_C=1, the SCSA applied to second order expansion deviates only slightly from the first order, increasing zeta by mere 0.016. This supports the high quality of the SCSA for physical crystalline membranes, as well as improves the comparison to experiments and numerical simulations of these systems. The prediction of SCSA applied to first order expansion for the Poisson ratio is shown to be exact to all orders.
Muon Capture on 3He and the Weak Structure of the Nucleon
Doron Gazit
Physics , 2008, DOI: 10.1016/j.physletb.2008.08.008
Abstract: The weak form factors of the nucleon, including the induced pseudoscalar form factor and second class terms, are constrained using a microscopic calculation of the weak capture process $^3He(\mu^{-},\nu_\mu)^3{H}$. The calculation is parameter free, and yields a rate of 1499(16) Hz, in agreement with the remarkable experimental measurement 1496(4) Hz. The nuclear wave functions are obtained using the EIHH method with the Argonne V18 nucleon--nucleon potential and the Urbana-IX three nucleon force. The weak currents in the nuclei are described using HB$\chi$PT formalism. The induced pseudoscalar form factor is found to agree with HB$\chi$PT prediction. The result is compatible with vanishing second class currents, with the tightest constraint to date on the conservation of vector current (CVC) hypothesis.
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