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Octupole Signatures in Moderately Neutron-Deficient Barium Isotopes: Evidence for Dynamical Intrinsic Reflection Asymmetry in Barium-124, 125 - Couverture souple

Mason, Paolo

 
9783838373584: Octupole Signatures in Moderately Neutron-Deficient Barium Isotopes: Evidence for Dynamical Intrinsic Reflection Asymmetry in Barium-124, 125
Couverture souple
ISBN 10 : 3838373588 ISBN 13 : 9783838373584
Editeur : LAP LAMBERT Academic Publishing, 2010

Synopsis

The spontaneous breaking of the spherical symmetry in the nuclear many-body problem is a long-established and thoroughly-studied topic. This work focuses in particular on octupole correlations, which cause the atomic nucleus to dynamically assume intrinsic reflection-asymmetric shapes such as a ?pear? or ?banana? shape. The most relevant fingerprints of these correlations are presented, along with the gamma-spectroscopy techniques that make it possible to identify them. The case of the nuclear species Barium-124 and Barium-125, populated in a fusion-evaporation reaction in which Nickel-64 projectiles impinged on a Nickel-64 target, is in particular addressed. It is shown how both barium isotopes do exhibit signatures of octupole correlations, i.e. low-lying negative-parity excited states and numerous electric-dipole transitions linking opposite-parity energy levels. It is also shown how these experimental results are consistent with theoretical expectations, as 56, the atomic number of Barium, corresponds to a single-particle configuration in which the proton Fermi level lies in the proximity of a pair of orbitals strongly coupled by the octupole interaction, i.e. h11/2 and d5/2.

Les informations fournies dans la section « Synopsis » peuvent faire référence à une autre édition de ce titre.

Présentation de l'éditeur

The spontaneous breaking of the spherical symmetry in the nuclear many-body problem is a long-established and thoroughly-studied topic. This work focuses in particular on octupole correlations, which cause the atomic nucleus to dynamically assume intrinsic reflection-asymmetric shapes such as a ?pear? or ?banana? shape. The most relevant fingerprints of these correlations are presented, along with the gamma-spectroscopy techniques that make it possible to identify them. The case of the nuclear species Barium-124 and Barium-125, populated in a fusion-evaporation reaction in which Nickel-64 projectiles impinged on a Nickel-64 target, is in particular addressed. It is shown how both barium isotopes do exhibit signatures of octupole correlations, i.e. low-lying negative-parity excited states and numerous electric-dipole transitions linking opposite-parity energy levels. It is also shown how these experimental results are consistent with theoretical expectations, as 56, the atomic number of Barium, corresponds to a single-particle configuration in which the proton Fermi level lies in the proximity of a pair of orbitals strongly coupled by the octupole interaction, i.e. h11/2 and d5/2.

Biographie de l'auteur

He graduated in physics from the University of Padova in 2001 and earned his PhD from the University of Milano in 2005. After five years as a Post-Doc with the Italian National Institute of Nuclear Physics at Padova and Legnaro National Labs, he now works as a Numerical Modeling Software Engineer with British Energy Ltd at Barnwood, Gloucester, UK.

Les informations fournies dans la section « A propos du livre » peuvent faire référence à une autre édition de ce titre.

Éditeur
LAP LAMBERT Academic Publishing
Date d'édition
2010
Langue
anglais
ISBN 10 
3838373588
ISBN 13 
9783838373584
Reliure
Broché
Nombre de pages
116
Coordonnées du fabricant
non disponible
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