Effective interactions and pairing correlations: from nuclei to compact stars
type: CreativeWork
description: The purpose of this dissertation is to study some general properties of nuclear many-body systems, ranging from infinite nuclear matter to finite nuclei. Our investigations is focused in particular on nuclear systems with neutron excess, to get a deeper insight in the open issue which concerns the isospin dependence of the nuclear interaction. The analysis is concentrated on the behavior of nuclear matter at densities which lie below the saturation one, with the aim to address several nuclear phenomena, which involve surface effects in nuclei and clustering processes emerging in nuclear reactions and compact stellar objects. Our study is devoted also to shed light on the impact of some relevant interparticle correlations, mainly active in the low density region of the phase diagram, which occur in fermionic system and are responsible for the superfluid phenomena: the pairing correlations. Our goal is therefore to examine the interplay of these correlations with the other terms of the effective interaction, usually introduced to approach the nuclear many-body problem. Wide attention is dedicated to the role of the pairing interaction in the astrophysical setting of stellar matter, especially when the cooling process of proto-neutron stars is concerned. Our analysis evidences in fact important pairing effects on neutrino emissivity and specific heat, which are two key ingredients in the thermal evolution of a compact star. On the one hand, superfluidity turns out to be responsible for a significant modification of the neutrino emission, for suitable density, asymmetry and temperature conditions, which can be of interest for the evolution of neutron stars and supernovae explosion in the pre-bounce phase. Focusing on neutral current neutrino scattering, we observe an increase of the neutrino differential cross section in a paired and low-density nuclear medium, at least close to the spinodal border, where the matter is characterized by quite large density fluctuations. …
abstract: The purpose of this dissertation is to study some general properties of nuclear many-body systems, ranging from infinite nuclear matter to finite nuclei. Our investigations is focused in particular on nuclear systems with neutron excess, to get a deeper insight in the open issue which concerns the isospin dependence of the nuclear interaction. The analysis is concentrated on the behavior of nuclear matter at densities which lie below the saturation one, with the aim to address several nuclear phenomena, which involve surface effects in nuclei and clustering processes emerging in nuclear reactions and compact stellar objects. Our study is devoted also to shed light on the impact of some relevant interparticle correlations, mainly active in the low density region of the phase diagram, which occur in fermionic system and are responsible for the superfluid phenomena: the pairing correlations. Our goal is therefore to examine the interplay of these correlations with the other terms of the effective interaction, usually introduced to approach the nuclear many-body problem. Wide attention is dedicated to the role of the pairing interaction in the astrophysical setting of stellar matter, especially when the cooling process of proto-neutron stars is concerned. Our analysis evidences in fact important pairing effects on neutrino emissivity and specific heat, which are two key ingredients in the thermal evolution of a compact star. On the one hand, superfluidity turns out to be responsible for a significant modification of the neutrino emission, for suitable density, asymmetry and temperature conditions, which can be of interest for the evolution of neutron stars and supernovae explosion in the pre-bounce phase. Focusing on neutral current neutrino scattering, we observe an increase of the neutrino differential cross section in a paired and low-density nuclear medium, at least close to the spinodal border, where the matter is characterized by quite large density fluctuations. …
author: BURRELLO, STEFANO
language: eng
keywords: pairing, symmetry energy, neutron stars
date published: 2017-01-26
date modified: 2026-07-24T01:35:17Z
provider: Università degli Studi di Catania
publisher: Networked Digital Library of Theses and Dissertations
type: WebPage
source organization: Università degli studi di Catania

PropertyValue
property ID: Handle
value: https://hdl.handle.net/20.500.11769/582740