43 Result(s)
within
F. Matteucci
Physics
English
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Article
High-resolution cross section measurements for neutron interactions on \(^{89}\) Y with incident neutron energies up to 95 keV
The cross section of the \(^{89}\) 89 ...
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Article
Open Access\(^{74}\) Ge( \(n,\gamma \) ) cross section below 70 keV measured at n_TOF CERN
Neutron capture reaction cross sections on \(^{74}\) 74 ...
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Article
A relic from a past merger event in the Large Magellanic Cloud
According to the standard cosmological scenario, the large galaxies that we observe today have reached their current mass via mergers with smaller galaxy satellites1. This hierarchical process is expected to take...
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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
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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 \(^{244}\) ...
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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 ...
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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...
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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...
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Article
High-accuracy determination of the neutron flux in the new experimental area n_TOF-EAR2 at CERN
A new high flux experimental area has recently become operational at the n_TOF facility at CERN. This new measuring station, n_TOF-EAR2, is placed at the end of a vertical beam line at a distance of approximat...
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Article
Open AccessNuclear data activities at the n_TOF facility at CERN
Nuclear data in general, and neutron-induced reaction cross sections in particular, are important for a wide variety of research fields. They play a key role in the safety and criticality assessment of nuclear...
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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...
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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...
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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...
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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 ...
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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...
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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...
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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...
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Chapter
The Origin of Biogenic Elements
We discuss the origin of the cosmic abundances of the chemical elements and in particular of biogenic elements such as H, C, N, O and Fe. Interesting enough, many of these elements are among the most abundant ...
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Chapter
The Influence of Nova Nucleosynthesis on the Chemical Evolution of the Galaxy
We adopt up-to-date yields of7Li,13C,15N from classical novae and use a well tested model for the chemical evolution of the Milky Way in order to predict the temporal evolution of these elemental species in the s...
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Chapter
The Effects of a Variable IMF on the Chemical Evolution of the Galaxy
In this work we explore the effects of adopting an initial mass function (IMF) variable in time on the chemical evolution of the Galaxy. In order to do that we adopt a chemical evolution model which assumes tw...
