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  • 1
    Online-Ressource
    Online-Ressource
    Cham :Springer International Publishing :
    UID:
    almahu_9949406996902882
    Umfang: XVII, 142 p. 76 illus., 68 illus. in color. , online resource.
    Ausgabe: 1st ed. 2022.
    ISBN: 9783031171505
    Serie: Springer Theses, Recognizing Outstanding Ph.D. Research,
    Inhalt: This thesis presents significant new observations of nuclear wobbling, and thus expands our understanding of nuclear triaxiality and its prevalence in the nuclear chart. Triaxial nuclear shapes are a very rare phenomena and their experimental identification often relies on two unique signatures - nuclear wobbling motion and chiral rotation. While nuclear chirality is a well-studied phenomenon, experimental observations of wobbling nuclei are rather limited. With the identification of 135Pr and 187Au as wobblers, this work establishes triaxiality to be a general phenomenon present in different regions of the nuclear chart, irrespective of any particular spin or deformation. A major focus of this work is the detailed investigation of the different kinds of wobbling modes. Depending on the geometry of the nuclear system, wobbling can be classified into two types - longitudinal and transverse. This work has, for the first time, reported evidence of the possible coexistence of both forms of wobbling in a single nucleus. Another important result reported in this work is the very first observation of co-existing chiral and wobbling modes in the 135Pr nucleus. This thesis details the experimental methods that led to this breakthrough, along with pertinent theoretical interpretations.
    Anmerkung: Chapter 1. Background and motivation -- Chapter 2. Theory -- Chapter 3. Experimental details -- Chapter 4. Analysis -- Chapter 5. Results and theoretical discussion -- Chapter 6. Updates and Future work.
    In: Springer Nature eBook
    Weitere Ausg.: Printed edition: ISBN 9783031171499
    Weitere Ausg.: Printed edition: ISBN 9783031171512
    Weitere Ausg.: Printed edition: ISBN 9783031171529
    Sprache: Englisch
    URL: Volltext  (URL des Erstveröffentlichers)
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Online-Ressource
    Online-Ressource
    Cham, Switzerland :Springer,
    UID:
    almafu_9960943507102883
    Umfang: 1 online resource (153 pages)
    ISBN: 9783031171505
    Serie: Springer Theses
    Anmerkung: Intro -- Supervisors' Foreword -- Acknowledgments -- Contents -- Parts of This Thesis Have Been Published in the Following Journal Articles -- Symbols -- 1 Background and Motivation -- 1.1 Nuclear Deformations -- 1.2 Nuclear Triaxiality -- 1.2.1 Nuclear Wobbling Motion -- 1.2.2 Chirality of Nuclear Rotation -- 1.3 Motivation for Studying 135Pr Nucleus -- 1.4 Motivation for Studying 187Au Nucleus -- References -- 2 Theory -- 2.1 Nuclear Shell Model -- 2.1.1 Harmonic Oscillator Potential -- 2.1.2 Woods-Saxon Potential -- 2.2 Nuclear Shapes and the Deformed Shell Model -- 2.3 Collective Rotation -- 2.3.1 Rotation About a Principal Axis -- 2.3.2 Rotation About a Tilted Axis -- 2.3.3 Rotation Out of the Principal Planes -- 2.4 Wobbling Modes in Nuclei -- 2.4.1 Wobbling in Even-Even Nuclei -- 2.4.2 Wobbling in Odd-A Nuclei -- 2.4.2.1 Longitudinal and Transverse Wobbling Bands -- 2.4.2.2 Yrast and Signature Partner Bands -- 2.5 Chiral Rotation in Nuclei -- 2.6 Nuclear Models to Study Wobbling Motion -- 2.6.1 Particle Rotor Model -- 2.6.2 Quasiparticle Triaxial Rotor Model -- 2.6.3 Triaxial Projected Shell Model -- 2.7 Theory of Angular Distributions -- References -- 3 Experimental Details -- 3.1 Interaction of Gamma Rays with Matter -- 3.2 Gamma-Ray Spectroscopy with Germanium Detectors -- 3.2.1 High Purity Germanium (HPGe) Detectors -- 3.2.2 Response Function of HPGe Spectra -- 3.2.3 Compton Suppression -- 3.2.4 The Gammasphere Array -- 3.2.4.1 Honeycomb Suppression Used in Gammasphere -- 3.2.4.2 Digital Gammasphere Acquisition System -- 3.3 Angular Distributions and DCO-Ratios -- 3.4 Reduced Transition Probability Ratios -- 3.5 Heavy-Ion Fusion-Evaporation Reactions -- 3.5.1 Beam and Target Specifications -- 3.6 ATLAS -- 3.7 Run Details -- 3.7.1 135Pr Run -- 3.7.2 187Au Runs -- 3.7.3 Chiral Wobbler Run. , 3.8 Pre-Calibration with Digital Gammasphere Data -- 3.9 Energy and Efficiency Calibrations -- References -- 4 Analysis -- 4.1 Data Sorting Into Matrices and Cubes -- 4.2 Background Subtraction Techniques -- 4.3 Coincidence Relationships and Level Schemes -- 4.3.1 135Pr -- 4.3.2 187Au -- 4.4 Spin and Parity Assignments -- 4.4.1 Angular Distributions and DCO-Like Ratios -- 4.4.1.1 135Pr -- 4.4.1.2 187Au -- References -- 5 Results and Theoretical Discussion -- 5.1 Two-Phonon Wobbling in 135Pr -- 5.2 Wobbling Motion in 187Au -- 5.2.1 Longitudinal Wobbling Bands -- 5.2.2 Transverse Wobbling Bands -- 5.3 Chiral Wobbling in 135Pr -- References -- 6 Updates and Future Work -- 6.1 Updates -- 6.2 Future Work -- References -- A Gammasphere Detector and Ring Information -- B Digital Gammasphere Calibration Parameters -- C Gammasphere Energy and Efficiency Calibration Parameters -- Curriculam vitae of Nirupama Sensharma.
    Weitere Ausg.: Print version: Sensharma, Nirupama Wobbling Motion in Nuclei: Transverse, Longitudinal, and Chiral Cham : Springer International Publishing AG,c2022 ISBN 9783031171499
    Sprache: Englisch
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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