Página 11 dos resultados de 19478 itens digitais encontrados em 0.029 segundos

## Neutrino scattering with nuclei - Theory of low energy nuclear effects and its applications

Leitner, T.; Buss, O.; Mosel, U.; Alvarez-Ruso, L.
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
45.88%
Current long baseline experiments aim at measuring neutrino oscillation parameters with a high precision. A critical quantity is the neutrino energy which can not be measured directly but has to be reconstructed from the observed hadrons. A good knowledge of neutrino-nucleus interactions is thus necessary to minimize the systematic uncertainties in neutrino fluxes, backgrounds and detector responses. In particular final-state interactions inside the target nucleus modify considerably the particle yields through rescattering, charge-exchange and absorption. Nuclear effects can be described with our coupled channel GiBUU transport model where the neutrino first interacts with a bound nucleon producing secondary particles which are then transported out of the nucleus. In this contribution, we give some examples for the application of our model focusing in particular on the MiniBooNE and K2K experiments.; Comment: To appear in the proceedings of the 10th International Workshop on Neutrino Factories, Super beams and Beta beams (NUFACT08), June 30 - July 5 2008, Valencia, Spain

## Neutrino beams as a probe of the nuclear isospin and spin-isospin excitations

Lazauskas, R.; Volpe, C.
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
45.88%
We explore the possibility of performing nuclear structure studies using low energy neutrino beams. In particular, low energy beta-beams and conventional sources (muon decay-at-rest) are considered. We present results on the total charged-current as well as flux-averaged cross sections associated to electron (anti)-neutrino scattering on oxygen, iron, molybdenum and lead, as typical examples. It is shown that by using neutrinos from low energy beta-beams, information on forbidden states, in particular the spin-dipole, could be extracted.; Comment: 13 pages, 4 figures, 3 tables

## Nuclear EMC Effect in a Statistical Model

Zhang, Yunhua; Shao, Lijing; Ma, Bo-Qiang
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
45.88%
A simple statistical model in terms of light-front kinematic variables is used to explain the nuclear EMC effect in the range $x \in [0.2,~0.7]$, which was constructed by us previously to calculate the parton distribution functions (PDFs) of the nucleon. Here, we treat the temperature $T$ as a parameter of the atomic number $A$, and get reasonable results in agreement with the experimental data. Our results show that the larger $A$, the lower $T$ thus the bigger volume $V$, and these features are consistent with other models. Moreover, we give the predictions of the quark distribution ratios, \emph{i.e.}, $q^A(x) / q^D(x)$, $\bar{q}^A(x) / \bar{q}^D(x)$, and $s^A(x) / s^D(x)$, and also the gluon ratio $g^A(x) / g^D(x)$ for iron as an example. The predictions are different from those by other models, thus experiments aiming at measuring the parton ratios of antiquarks, strange quarks, and gluons can provide a discrimination of different models.; Comment: 26 latex pages, 3 figures

## Profiling hot and dense nuclear medium with high transverse momentum hadrons produced in d+Au and Au+Au collisions by the PHENIX experiment at RHIC

Sakaguchi, Takao; collaboration, for the PHENIX
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
45.88%
PHENIX measurements of high transverse momentum ($p_T$) identified hadrons in $d$+Au and Au+Au collisions are presented. The nuclear modification factors ($R_{d{\rm A}}$ and $R_{\rm AA}$) for $\pi^0$ and $\eta$ are found to be very consistent in both collision systems, respectively. Using large amount of $p+p$ and Au+Au datasets, the fractional momentum loss ($S_{\rm loss}$) and the path-length dependent yield of $\pi^0$ in Au+Au collisions are obtained. The hadron spectra in the most central $d$+Au and the most peripheral Au+Au collisions are studied. The spectra shapes are found to be similar in both systems, but the yield is suppressed in the most peripheral Au+Au collisions.; Comment: 4 pages, 5 figures, talk presented at the International Nuclear Physics Conference 2013, held in Florence, Italy, on June 2 - 7, 2013

## Phenomenological model of the Kaonic Nuclear Cluster K^-pp in the ground state

Ivanov, A. N.; Kienle, P.; Marton, J.; Widmann, E.
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
45.88%
A phenomenological model is proposed for the analysis of the properties of the Kaonic Nuclear Cluster (KNC) Kpp in its ground state. Inside the KNC K^-pp we describe the relative motion of the protons in the pp pair and the motion of the K^- meson relative to the pp pair in terms of wave functions of 3-dimensional harmonic oscillators. The interaction strength is parameterised in our model by the frequency of the longitudinal oscillation of the K^- meson relative to the pp pair. This parameter was determined with the binding energy and width of the strange baryon Lambda(1405) by assuming that it is a bound state of the K^-p pair. In terms of this interaction strength we calculate the binding energy epsilon_(Kpp) = - 118 MeV, the partial widths of non-pionic decay channels and the total width, Gamma_(Kpp) = 58 MeV. This agrees well with the experimental data by the FINUDA Collaboration (PRL 94, 212303 (2005)): epsilon_exp = - 115(+6/-5) MeV and Gamma_exp = 67(+14/-11) MeV. The discrepancy with the results, obtained by Akaishi and Yamazaki within the potential model approach, is discussed.; Comment: 22 pages, 6 figures, Latex, The amplitudes of elastic and inelastic K^-pp scattering are calculated using the chiral Lagrangian with SU(3)xSU(3) chiral symmetry and derivative meson-baryon couplings. The theoretical binding energy and width of the K^-pp bound state agree well with the experimental data by the FINUDA Collaboration. The discrepancy with the results...

## J/psi and psi' production and their normal nuclear absorption in proton-nucleus collisions at 400 GeV

NA50 Collaboration
Tipo: Artigo de Revista Científica
Relevância na Pesquisa
45.88%

## Heavy-flavour measurements in pp and Pb-Pb collisions with the ALICE experiment at the CERN LHC

Averbeck, Ralf; Collaboration, for the ALICE
Tipo: Artigo de Revista Científica