Nuclear isospin mixing and elastic parity-violating electron scattering (2009)
Moreno, Oscar, Sarriguren, Pedro, Moya De Guerra, Elvira, Udias, J.M., Donnelly, T.W., Sick, I.
27 pages, 3 tables, 9 figures.--PACS nrs.: 24.80.+y, 25.30.Bf, 21.60.Jz.-- Available on line on Jul 25, 2009.--ArXiv pre-print available at: http://arxiv.org/abs/0806.0552
Nuclear effects in electron reactions and their impact on neutrino processes (2009)
Barbaro, M. B., Amaro, J. E., Caballero, J. A., Cenni, R., Donnelly, T. W., Molinari, A., ...
We suggest that superscaling in electroweak interactions with nuclei, namely the observation that the reduced electron-nucleus cross sections are to a large degree independent of the momentum...
Neutrino Interactions Importance for Nuclear Physics (2009)
Amaro, J. E., Maieron, C., Valverde, M., Nieves, J., Barbaro, M. B., Caballero, J. A., ...
We review the general interplay between Nuclear Physics and neutrino-nucleus cross sections at intermediate and high energies. The effects of different reaction mechanisms over the neutrino...
Relativistic models for electron and neutrino-nucleus scattering (2009)
Giusti, C., Meucci, A., Pacati, F. D., Caballero, J. A., Udias, J. M.
Relativistic models developed for the exclusive and inclusive quasielastic (QE) electron scattering have been extended to charged-current (CC) and neutral-current (NC) neutrino-nucleus scattering....
Amaro, J. E., Barbaro, M. B., Caballero, J. A., Donnelly, T. W., Maieron, C., Udias, J. M.
The effects of meson-exchange currents (MEC) are computed for the one-particle one-hole transverse response function for finite nuclei at high momentum transfers $q$ in the region of the quasielastic...
Meucci, Andrea, Caballero, J. A., Giusti, C., Pacati, F. D., Udias, J. M.
An analysis of inclusive quasielastic electron scattering is presented using different descriptions of the final state interactions within the framework of the relativistic impulse approximation. The...
Nuclear isospin mixing and elastic parity-violating electron scattering (2008)
Moreno, O., Sarriguren, P., De Guerra, E. Moya, Udias, J. M., Donnelly, T. W., Sick, I.
The influence of nuclear isospin mixing on parity-violating elastic electron scattering is studied for the even-even, N=Z nuclei 12C, 24Mg, 28Si, and 32S. Their ground-state wave functions have been...
Properties of Nucleon Resonances by means of a Genetic Algorithm (2008)
Fernandez-Ramirez, C., De Guerra, E. Moya, Udias, A., Udias, J. M.
We present an optimization scheme that employs a Genetic Algorithm (GA) to determine the properties of low-lying nucleon excitations within a realistic photo-pion production model based upon an...
Martinez, M. C., Caballero, J. A., Donnelly, T. W., Udias, J. M.
Effects of strong final-state interactions in the superscaling properties of neutral-current quasielastic neutrino cross sections are investigated using the Relativistic Impulse Approximation as...
Fernandez-Ramirez, C., Martinez, M. C., Vignote, J. R., Udias, J. M.
The spin asymmetry of the photon in the exclusive A(gamma,pi N)A-1 reaction is computed employing a recently developed fully relativistic model based on elementary pion production amplitudes that...
Superscaling Predictions for Neutral Current Quasielastic Neutrino-Nucleus Scattering (2008)
Martinez, M. C., Caballero, J. A., Donnelly, T. W., Udias, J. M.
The application of superscaling ideas to predict neutral-current (NC) quasielastic (QE) neutrino cross sections is investigated. Results obtained within the relativistic impulse approximation (RIA)...
Fernandez-Ramirez, C., De Guerra, E. Moya, Udias, J. M.
We investigate the importance of crossing symmetry in effective field models and the effects of phenomenological nucleon resonance widths on the paradigmatic case of pion photoproduction. We use...
Eta Photoproduction as a Test of the Extended Chiral Symmetry (2007)
Fernandez-Ramirez, C., De Guerra, E. Moya, Udias, J. M.
We analyze the $\gamma p \to \eta p$ process from threshold up to 1.2 GeV, employing an effective Lagrangian approach that allows for a mixing of eta couplings of pseudoscalar and pseudovector...
Caballero, J. A., Amaro, J. E., Barbaro, M. B., Donnelly, T. W., Udias, J. M.
The role of isospin in quasielastic electron scattering and charge-changing neutrino reactions is investigated in the relativistic impulse approximation. We analyze proton and neutron scaling...
Amaro, J. E., Barbaro, M. B., Caballero, J. A., Donnelly, T. W., Udias, J. M.
The semi-relativistic approach to electron and neutrino quasielastic scattering from nuclei is extended to include final-state interactions. Starting with the usual non-relativistic continuum shell...
Fernandez-Ramirez, C., De Guerra, E. Moya, Udias, J. M.
We present an extraction of the E2/M1 ratio of the $\Delta$(1232) from experimental data applying an effective Lagrangian model. We compare the result obtained with different nucleonic models and we...
Antonov, A. N., Ivanov, M. V., Gaidarov, M. K., Moya De Guerra, Elvira, Caballero, Juan Antonio, Barbaro, M. V., ...
15 pages, 1 table, 16 figures.-- PACS nrs.: 25.30.-c; 21.60.-n; 25.30.Pt; 21.10.Ft.-- ArXiv pre-print available at: http://arxiv.org/abs/nucl-th/0609056v1
Gamow-Teller strength distributions in Xe isotopes (2006)
Moreno, O., Alvarez-Rodriguez, R., Sarriguren, P., De Guerra, E. Moya, Udias, J. M., Vignote, J. R.
The energy distributions of the Gamow-Teller strength are studied for even-even Xe isotopes with mass numbers from 124 to 142. A self-consistent microscopic formalism is used to generate the single...
Antonov, A. N., Ivanov, M. V., Gaidarov, M. K., De Guerra, E. Moya, Caballero, J. A., Barbaro, M. B., ...
Superscaling analyses of inclusive electron scattering from nuclei are extended from the quasielastic processes to the delta excitation region. The calculations of $(e,e^\prime)$ cross sections for...
FIRST: Fast Iterative Reconstruction Software for (PET) tomography (2006)
Herraiz, J. L., Espana, S., Vaquero, J. J., Desco, M., Udias, J. M.
Small animal PET scanners require high spatial resolution and good sensitivity. To reconstruct high-resolution images in 3D-PET, iterative methods, such as OSEM, are superior to analytical...
Erratum: Scaling functions and superscaling in medium and heavy nuclei (2006)
Antonov, A. N., Ivanov, M. V., Gaidarov, M. K., Moya De Guerra, Elvira, Sarriguren, Pedro, Udias, J. M.
1 page.-- PACS nrs.: 25.30.Fj; 21.10.Ft; 21.60.-n; 99.10.Cd.-- Original article published in Physical Review C 73(4): 047302(2006), available at: http://hdl.handle.net/10261/15039
Scaling functions and superscaling in medium and heavy nuclei (2006)
Antonov, A. N., Ivanov, M. V., Gaidarov, M. K., Moya De Guerra, Elvira, Sarriguren, Pedro, Udias, J. M.
4 pages, 1 figure.-- PACS nrs.: 25.30.Fj; 21.60.-n; 21.10.Ft; 21.10.Gv.-- ArXiv pre-print available at: http://arxiv.org/abs/nucl-th/0603048v1
Scaling Functions and Superscaling in Medium and Heavy Nuclei (2006)
Antonov, A. N., Ivanov, M. V., Gaidarov, M. K., De Guerra, E. Moya, Sarriguren, P., Udias, J. M.
The scaling function $f(\psi')$ for medium and heavy nuclei with $Z\neq N$ for which the proton and neutron densities are not similar is constructed within the coherent density fluctuation model...
Hints on the quadrupole deformation of the $\Delta$(1232) (2006)
Fernandez-Ramirez, C., De Guerra, E. Moya, Udias, J. M.
The E2/M1 ratio (EMR) of the $\Delta$(1232) is extracted from the world data in pion photoproduction by means of an Effective Lagrangian Approach (ELA).This quantity has been derived within a...
Antonov, A.N., Kadrev, D.N., Gaidarov, M.K., Moya De Guerra, Elvira, Sarriguren, Pedro, Udias, J. M., ...
11 pages, 3 tables, 11 figures.--PACS nrs.: 21.10.Ft; 21.10.Gv; 25.30.Bf; 21.60.−n.--ArXiv pre-print available at: http://arxiv.org/abs/nucl-th/0506056v2
Effective Lagrangian Approach to pion photoproduction from the nucleon (2005)
Fernandez-Ramirez, C., De Guerra, E. Moya, Udias, J. M.
We present a pion photoproduction model on the free nucleon based on an Effective Lagrangian Approach (ELA) which includes the nucleon resonances ($\Delta(1232)$, N(1440), N(1520), N(1535), $\Delta...
Antonov, A. N., Kadrev, D. N., Gaidarov, M. K., De Guerra, E. Moya, Sarriguren, P., Udias, J. M., ...
Results of charge form factors calculations for several unstable neutron-rich isotopes of light, medium and heavy nuclei (He, Li, Ni, Kr, Sn) are presented and compared to those of stable isotopes in...
Relativistic models for quasi-elastic neutrino scattering (2005)
Martinez, M. C., Lava, P., Jachowicz, N., Ryckebusch, J., Vantournhout, K., Udias, J. M.
We present quasi-elastic neutrino-nucleus cross sections in the energy range from 150 MeV up to 5 GeV for the target nuclei 12C and 56Fe. A relativistic description of the nuclear dynamics and the...
Caballero, J. A., Amaro, J. E., Barbaro, M. B., Donnelly, T. W., Maieron, C., Udias, J. M.
Superscaling of the quasielastic cross section in charged current neutrino-nucleus reactions at energies of a few GeV is investigated within the framework of the relativistic impulse approximation....
Superscaling, scaling functions, and nucleon momentum distributions in nuclei (2005)
Antonov, A.N., Gaidarov, M.K., Ivanov, M.V., Kadrev, D.N., Moya De Guerra, Elvira, Sarriguren, Pedro, ...
11 pages, 4 figures.--PACS nrs.: 25.30.Fj; 21.60.-n; 21.10.Ft; 24.10.Jv.--ArXiv pre-print available at: http://arxiv.org/abs/nucl-th/0411100v1
Superscaling, Scaling Functions and Nucleon Momentum Distributions in Nuclei (2004)
Antonov, A. N., Gaidarov, M. K., Ivanov, M. V., Kadrev, D. N., De Guerra, E. Moya, Sarriguren, P., ...
The scaling functions $f(\psi')$ and $F(y)$ from the $\psi'$- and $y$-scaling analyses of inclusive electron scattering from nuclei are explored within the coherent density fluctuation model (CDFM)....
A( e→ , e' p→ )B responses: From bare nucleons to complex nuclei (2004)
Vignote, Javier R., Martínez, M.C., Caballero, J.A., Moya De Guerra, Elvira, Udias, J.M.
12 pages, 1 table, 5 figures, 2 appendices.--PACS nrs.: 25.30.Rw; 24.10.Jv; 21.60.Cs.--ArXiv pre-print available at: http://arxiv.org/abs/nucl-th/0312076v2
Measurement of Rlt and Atl in the 4He(e,e'p)3H Reaction at pmiss of 130-300 MeV/c (2004)
Aniol, K. A., Epstein, M. B., Gama, E., Margaziotis, D. J., Bertozzi, W., Chen, J. P., ...
We have measured the 4He(e,e'p)3H reaction at missing momenta of 130-300 MeV/c using the three-spectrometer facility at the Mainz microtron MAMI. Data were taken in perpendicular kinematics to allow...
Final state interaction effects in neutrino-nucleus quasielastic scattering (2004)
Maieron, C., Martinez, M. C., Caballero, J. A., Udias, J. M.
We consider the charged-current quasielastic scattering of muon neutrinos on an Oxygen 16 target, described within a relativistic shell model and, for comparison, the relativistic Fermi gas. Final...
Antonov, A.N., Gaidarov, M.K., Kadrev, D.N., Ivanov, M.V., Moya De Guerra, Elvira, Udias, J.M.
7 pages, 1 table, 5 figures.--PACS nrs.: 25.30.Fj; 21.60.-n; 21.10.Ft; 24.10.Jv
Superscaling in Nuclei: A Search for Scaling Function Beyond the Relativistic Fermi Gas Model (2004)
Antonov, A. N., Gaidarov, M. K., Kadrev, D. N., Ivanov, M. V., De Guerra, E. Moya, Udias, J. M.
We construct a scaling function $f(\psi^{\prime})$ for inclusive electron scattering from nuclei within the Coherent Density Fluctuation Model (CDFM). The latter is a natural extension to finite...
Nuclear transparencies in relativistic A(e,e'p) models (2004)
Lava, P., Martinez, M. C., Ryckebusch, J., Caballero, J. A., Udias, J. M.
Relativistic and unfactorized calculations for the nuclear transparency extracted from exclusive A(e,e'p) reactions for 0.3 \leq Q^2 \leq 10 (GeV/c)^2 are presented for the target nuclei C, Si, Fe...
A$(\vec{e},e'\vec{p})$B responses: from bare nucleons to complex nuclei (2003)
Vignote, Javier R., Martinez, M. C., Caballero, J. A., De Guerra, E. Moya, Udias, J. M.
We study the occurrence of factorization in polarized and unpolarized observables in coincidence quasi-elastic electron scattering. Starting with the relativistic distorted wave impulse...
Strauch, S., Dieterich, S., Aniol, K.A., Annand, J.R.M., Baker, O.K., Bertozzi, W., ...
We have measured the proton recoil polarization in the He-4((e) over right arrow ,e(')(p) over right arrow)H-4 reaction at Q(2)=0.5, 1.0, 1.6, and 2.6 (GeV/c)(2). The measured ratio of polarization...
Recent Developments in relativistic models for exclusive (e,e'p) reactions (2001)
Udias, J. M., Vignote, Javier R., De Guerra, E. Moya, Escuderos, A., Caballero, J. A.
A comparison of impulse approximation calculations for the (e,e'p) reaction, based on the Dirac equation and the Schrodinger one is presented. Trivial (kinematics) differences are indicated, as well...
Polarization transfer in the 4He(e,e'p)3H reaction (2001)
Dieterich, S., Bartsch, P., Baumann, D., Bermuth, J., Bohinc, K., Bohm, R., ...
Polarization transfer in the4He(e,e'p)3H reaction at a Q2 of 0.4 (GeV/c)2 was measured at the Mainz Microtron MAMI. The ratio of the transverse to the longitudinal polarization components of the...
Udias, J. M., Caballero, J. A., De Guerra, E. Moya, Vignote, Javier R., Escuderos, A.
We use the relativistic distorted wave impulse approximation to analyze data on 16O(e,e'p)15N at |Q^2|\leq 0.4 (GeV/c)^2 that were obtained by different groups and seemed controversial. Results for...
Polarization transfer in the $^{4}$He$(\vec{e},e' \vec{p}^{3}$H reaction (2000)
Dieterich, S., Bartsch, P., Baumann, D., Bermuth, J., Bohinc, K., Böhm, R., ...
Polarization transfer in the 4He(e,e'p)3H reaction at a Q^2 of 0.4 (GeV/c)^2 was measured at the Mainz Microtron MAMI. The ratio of the transverse to the longitudinal polarization components of the...
Relativistic nuclear structure effects in (e,e' vec{p}) (2000)
Udias, J. M., Vignote, Javier R.
Results for recoil nucleon induced polarization for $(e,e'\vec{p})$ are presented using various approximations for the relativistic nucleonic current, at the kinematics of a recent experiment at...
Quaiselastic scattering from relativistic bound nucleons: Transverse-Longitudinal response (1999)
Udias, J. M., Caballero, J. A., De Guerra, E. Moya, Amaro, J. E., Donnelly, T. W.
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...
Alberico, W. M., Barbaro, M. B., Bilenky, S. M., Caballero, J. A., Giunti, C., Maieron, C., ...
We consider ratios of elastic neutrino(antineutrino)-proton cross sections measured by the Brookhaven BNL-734 experiment and use them to obtain the neutral current (NC) over charged current (CC)...
Caballero, J. A., Donnelly, T. W., De Guerra, E. Moya, Udias, J. M.
Scalar, baryon and vector--current densities in coordinate and momentum space are calculated within a relativistic mean--field model. The role of the low components of the bound nucleon wave function...
Alberico, W. M., Barbaro, M. B., Bilenky, S. M., Caballero, J. A., Giunti, C., Maieron, C., ...
We calculate the ratio of proton and neutron yields in NC induced neutrino(antineutrino)-nucleus inelastic scattering at neutrino energies of about 1 GeV. We show that this ratio depends very weakly...
Caballero, J. A., Donnelly, T. W., De Guerra, E. Moya, Udias, J. M.
The issue of factorization within the context of coincidence quasi-elastic electron scattering is reviewed. Using a relativistic formalism for the entire reaction mechanism and restricting ourselves...
Correlations and the Cross Section of Exclusive ($e,e'p$) Reactions for $^{16}$O (1997)
Udias, J. M., Müther, H., Skouras, L. D., Polls, A.
The reduced cross section for exclusive ($e,e'p$) reactions has been studied in DWIA for the example of the nucleus $^{16}$O using a spectral function containing effects of correlations. The spectral...
Inelastic neutrino and antineutrino scattering on nuclei and ``strangeness'' of the nucleon (1997)
Alberico, W. M., Barbaro, M. B., Bilenky, S. M., Caballero, J. A., Giunti, C., Maieron, C., ...
Possibilities to extract information on the strange form factors of the nucleon from neutrino (antineutrino) inelastic scattering on nuclei, in an energy range from 200 MeV to 1 GeV and more, are...
Relativistic analysis of the 208Pb(e,e'p)207Tl reaction at high momentum (1996)
Udias, J. M., Sarriguren, P., De Guerra, E. Moya, Caballero, J. A.
The recent 208Pb(e,e'p)207Tl data from NIKHEF-K at high missing momentum (p_m>300 MeV/c) are compared to theoretical results obtained with a fully relativistic formalism previously applied to analyze...
Exchange Current Corrections to Neutrino-Nucleus Scattering. I. Nuclear Matter (1996)
Relativistic exchange current corrections to the impulse approximation in low and intermediate energy neutrino--nucleus scattering are presented assuming non--vanishing strange quark form factors for...
Parity violation in quasielastic electron scattering from closed-shell nuclei (1995)
Amaro, J. E., Caballero, J. A., Donnelly, T. W., Lallena, A. M., De Guerra, E. Moya, Udias, J. M.
The electromagnetic and weak neutral current matrix elements that enter in the analysis of parity-violating quasielastic electron scattering are calculated using a continuum nuclear shell model. New...
Exchange Current Corrections to Neutrino--Nucleus Scattering (1995)
Umino, Y., Udias, J. M., Mulders, P. J.
Relativistic exchange current corrections to neutrino--nucleus cross sections are presented assuming non--vanishing strange quark form factors for the constituent nucleons. For charged current...
Probing Deformed Orbitals with \vec{A}(\vec{e}, e' N)B reactions (1994)
Garrido, E., Caballero, J. A., De Guerra, E. Moya, Sarriguren, P., Udias, J. M.
We present results for response functions and asymmetries in the nuclear reactions 37\vec{Ar}(\vec{e},e'n)36Ar and 37\vec{K}(\vec{e},e' p)36Ar at quasifree kinematics. We compare PWIA results...
Spin dependent Momentum Distributions in Deformed Nuclei (1994)
Caballero, J. A., Garrido, E., De Guerra, E. Moya, Sarriguren, P., Udias, J. M.
We study the properties of the spin dependent one body density in momentum space for odd--A polarized deformed nuclei within the mean field approximation. We derive analytic expressions connecting...
Exchange current corrections to neutrino-nucleus scattering (1994)
Umino, Y, Udias, J M, Mulders, P J
Relativistic exchange current corrections to neutrino--nucleus cross sections are presented assuming non--vanishing strange quark form factors for the constituent nucleons. For charged current...
Relativistic versus Nonrelativistic Optical Potentials in A(e,e'p)B Reactions (1993)
Udias, J. M., Sarriguren, P., De Guerra, E. Moya, Garrido, E., Caballero, J. A.
We investigate the role of relativistic and nonrelativistic optical potentials used in the analysis of ($e,e'p$) data. We find that the relativistic calculations produce smaller ($e,e'p$) cross...
Spectroscopic Factors in $^{40}$Ca and $^{208}$Pb from $(e,e'p)$: Fully Relativistic Analysis (1993)
Udias, J. M., Sarriguren, P., De Guerra, E. Moya, Garrido, E., Caballero, J. A.
We present results for spectroscopic factors of the outermost shells in $^{40}$Ca and $^{208}$Pb, which have been derived from the comparison between the available quasielastic ($e,e'p$) data from...
Polarization transfer in the 4He(e,e'p)3H reaction
Dieterich, S., Bartsch, P., Baumann, D., Bermuth, J., Bohinc, K., Bohm, R., ...
Polarization transfer in the4He(e,e'p)3H reaction at a Q2 of 0.4 (GeV/c)2 was measured at the Mainz Microtron MAMI. The ratio of the transverse to the longitudinal polarization components of the...
Strauch, S., Dieterich, S., Aniol, K.A., Annand, J.R.M., Baker, O.K., Bertozzi, W., ...
We have measured the proton recoil polarization in the He-4((e) over right arrow ,e(')(p) over right arrow)H-4 reaction at Q(2)=0.5, 1.0, 1.6, and 2.6 (GeV/c)(2). The measured ratio of polarization...
Polarization transfer in the 4He(e,e'p)3H reaction
Dieterich, S., Bartsch, P., Baumann, D., Bermuth, J., Bohinc, K., Bohm, R., ...
Polarization transfer in the4He(e,e'p)3H reaction at a Q2 of 0.4 (GeV/c)2 was measured at the Mainz Microtron MAMI. The ratio of the transverse to the longitudinal polarization components of the...
Strauch, S., Dieterich, S., Aniol, K.A., Annand, J.R.M., Baker, O.K., Bertozzi, W., ...
We have measured the proton recoil polarization in the He-4((e) over right arrow ,e(')(p) over right arrow)H-4 reaction at Q(2)=0.5, 1.0, 1.6, and 2.6 (GeV/c)(2). The measured ratio of polarization...