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Exotic Nuclear Excitations: The Transverse Wobbling Mode in 135 Pr: Springer Theses

Autor James Till Matta
en Limba Engleză Hardback – 4 apr 2017
The work presented in this thesis established the existence of wobbling at low spin and low deformation in the Z~60, N~76 nuclear region.  This opens the region to further searches for wobbling and shows that wobbling is not confined to a particular quasiparticle orbital, spin or deformation. 
While deformed nuclei usually have axial shape, triaxial shapes have been predicted at low to moderate spins in certain regions of the nuclear chart (e.g. Z~60, N~76 and Z~46, N~66).  Observation of one of the fingerprints of triaxiality, chirality and wobbling, guarantees that the nucleus is axially asymmetric.  While chirality has been observed in numerous nuclei from many regions of the nuclear chart, wobbling, prior to this work, had only been observed at high spins in super deformed bands in five nuclei confined to the Z~70, N~90 region.
Additionally, this dissertation establishes a new interpretation for the wobbling phenomenon.  It shows for the first time that the nucleon aligns to the short axis, which explains the decrease in wobbling energies with angular momentum seen on this and all previous wobbling nuclei while still explaining the observed B(E2out)B(E2in) ratios.  This is a new phenomenon, which is in contrast to the increase of the wobbling energies predicted by Bohr and Mottelson.
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Specificații

ISBN-13: 9783319532394
ISBN-10: 3319532391
Pagini: 112
Ilustrații: XV, 112 p. 57 illus., 35 illus. in color.
Dimensiuni: 155 x 235 x 10 mm
Greutate: 0.36 kg
Ediția:1st ed. 2017
Editura: Springer International Publishing
Colecția Springer
Seria Springer Theses

Locul publicării:Cham, Switzerland

Cuprins

Introduction.- Nuclear models for high spin phenomena.- Experimental methods.- Transverse wobbling in 135pr.- Summary and outlook.- Gammasphere ring and detector information.- Inga ring and detector information.- Negative parity level and transition information.

Notă biografică

Dr James Matta was awarded the PhD degree by the University of Notre Dame in 2015, and is now with Oak Ridge National Laboratory.

Textul de pe ultima copertă

The work presented in this thesis established the existence of wobbling at low spin and low deformation in the Z~60, N~76 nuclear region.  This opens the region to further searches for wobbling and shows that wobbling is not confined to a particular quasiparticle orbital, spin or deformation. 
While deformed nuclei usually have axial shape, triaxial shapes have been predicted at low to moderate spins in certain regions of the nuclear chart (e.g. Z~60, N~76 and Z~46, N~66).  Observation of one of the fingerprints of triaxiality, chirality and wobbling, guarantees that the nucleus is axially asymmetric.  While chirality has been observed in numerous nuclei from many regions of the nuclear chart, wobbling, prior to this work, had only been observed at high spins in super deformed bands in five nuclei confined to the Z~70, N~90 region.
Additionally, this dissertation establishes a new interpretation for the wobbling phenomenon.  It shows for the first time that the nucleon aligns to the short axis, which explains the decrease in wobbling energies with angular momentum seen on this and all previous wobbling nuclei while still explaining the observed B(E2out)B(E2in) ratios.  This is a new phenomenon, which is in contrast to the increase of the wobbling energies predicted by Bohr and Mottelson.

Caracteristici

Nominated by the University of Notre Dame as an outstanding PhD Thesis Presents work establishing the existence of wobbling at low spin and low deformation in the Z~60, N~76 nuclear region Establishes a new interpretation for the wobbling phenomenon in deformed nuclei Includes supplementary material: sn.pub/extras