23 Result(s)
within
Conference Paper
F. Matteucci
English
-
Chapter and Conference Paper
\(^{7}\) Be(n,p) \(^{7}\) Li Cross Section Measurement for the Cosmological Lithium Problem at the n \(\_\) TOF Facility at CERN
One of the most puzzling problems in Nuclear Astrophysics is the “Cosmological Lithium Problem”, i.e the discrepancy between the primordial abundance of
-
Chapter and Conference Paper
Measurement of the \(^{244}\) Cm and \(^{246}\) Cm Neutron-Induced Cross Sections at the n_TOF Facility
The neutron capture reactions of the \(^{244}\) ...
-
Chapter and Conference Paper
The Evolution of CNO Isotope Ratios: A Litmus Test for Stellar IMF Variations in Galaxies Across Cosmic Time
Determining the shape of the stellar initial mass function (IMF) and whether it is constant or varies in space and time is the Holy Grail of modern astrophysics, with profound implications for all theories of ...
-
Chapter and Conference Paper
Characterization and First Test of an i-TED Prototype at CERN n_TOF
Neutron capture cross section measurements are of fundamental importance for the study of the slow process of neutron capture, so called s-process. This mechanism is responsible for the formation of most eleme...
-
Chapter and Conference Paper
Data for the s Process from n_TOF
A considerable amount of (n, \(\gamma \) ) reactions has been studied, so far, at the neutron time-of-flight facility n...
-
Chapter and Conference Paper
Comprehensive Abundance Measurements in Damped Lyα Systems
The high quality, high-resolution UVES/VLT and HIRES/Keck spectra of 10 quasars allowed us to analyze in detail 11 intervening damped Lyα systems at z abs = 1.7 – 2.5. We detect...
-
Chapter and Conference Paper
Chemical Evolution of Late-Type Dwarfs
After reviewing some general properties of late-type dwarf galaxies, we present and discuss chemical evolution models for two windy starburst dwarfs: NGC 1569 and NGC1705. Both have their recent star formation...
-
Chapter and Conference Paper
The Effects of Pop III Stars on the Abundances of Spheroids
We have studied the effects of an hypothetical initial generation made only of very massive stars (M > 100M ⊙, pair-creation SNe) on the chemical and photometric evolution of spheroidal sy...
-
Chapter and Conference Paper
The Chemical Evolution of Dwarf Spheroidals
We describe some models for the chemical evolution of dwarf spheroidals of the Local Group: Draco, Sagittarius, Sculptor, Sextan, Ursa Minor and Carina. These models assume one long or at maximum two episodes ...
-
Chapter and Conference Paper
N/O Abundance Ratios: Milky Way and DLAs
It has been recently shown in Chiappini et al. [2] that models of chemical evolution computed with the Meynet & Maeder [4] yields for the whole range of masses, predict a slower increase of N with respect to w...
-
Chapter and Conference Paper
Metallicity in Open Clusters
We present here the results of abundance measurements of iron, calcium and nickel in four open clusters, from UVES spectra of solar–type stars. A code developed by one of the authors (François) performs line r...
-
Chapter and Conference Paper
Initial Mass Function and Galactic Chemical Evolution Models
In this contribution we focus on results from chemical evolution models for the solar neighbourhood obtained by varying the IMF. Results for galaxies of different morphological type are discussed as well. They...
-
Chapter and Conference Paper
The Formation of Chemical Elements and their Abundances in the Solar System
The Earth and the Moon are related by their common origin in the solar system, as proven by their chemical composition. In this paper I review the current ideas about the formation and evolution of the chemica...
-
Chapter and Conference Paper
The Chemical Evolution of the Galactic Bulge
In this paper we review the chemical evolution models for the Galactic bulge: in particular, we discuss the predictions of models as compared with the available abundance data and infer the mechanism as well a...
-
Chapter and Conference Paper
A New Picture for the Galaxy Formation
The observational constraints are of fundamental importance to build a realistic chemical evolution model. With respect to these constraints the last years have been of crucial importance and, in the case of t...
-
Chapter and Conference Paper
Neutral Nitrogen in Damped Lyman a Systems
Nitrogen abundance determinations in high-redshift galaxies are an important tool for understanding the first stages of galactic chemical evolution. The most intense NI lines, i.e. the triplets at rest wavelen...
-
Chapter and Conference Paper
The Enrichment of the Intracluster Medium
Recent observational evidence for steep dwarf galaxy luminosity functions in several rich clusters has led to speculation that their precursors, via supernovae (SNe)-driven galactic winds, may be the source of...
-
Chapter and Conference Paper
Stellar Production of Lithium
Under the assumption that the abundance of 7 Li in population II stars represents the primordial 7 Li abunda...
-
Chapter and Conference Paper
Galactic Ba Enrichment from TP-AGB Stars
The production of the bulk of barium has long been ascribed to the main component of the s-process, whose astrophysical site has been envisaged in the convective He shell of Thermally Pulsing Asymptotic Giant Bra...
-
Chapter and Conference Paper
Abundance Gradients and Related Properties in Galaxies
Abundance gradients and related properties in galaxies are reviewed. In particular, radial abundance gradients in spirals and ellipticals are discussed together with possible interpretations.
