Triaxial rotor model for the study of the nuclear structure and transition between different symmetries in nuclei for A = 120-200 mass region

2013 ◽  
Vol 7 (4) ◽  
pp. 357
Author(s):  
Vidya Devi
Keyword(s):  
Nuclear Structure ◽  
Mass Region ◽  
Rotor Model

Possible dual bubble-like structure predicted by the relativistic Hartree–Bogoliubov model

2020 ◽  
Vol 29 (09) ◽  
pp. 2050073
Author(s):  
Sven Åberg ◽  
Akhilesh Yadav ◽  
A. Shukla
Keyword(s):  
Angular Momentum ◽  
Nuclear Structure ◽  
Experimental Observation ◽  
Mass Region ◽  
Momentum State ◽  
Angular Momentum State ◽  
Shell Gaps

Experimental observation of [Formula: see text]Si as a proton bubble nuclei has heated up the interest in the study of exotic bubble shaped nuclei. In this work, some of the potential doubly bubble-like (for proton as well as neutron both simultaneously) cases have been explored using relativistic Hartree–Bogoliubov (RHB) in light mass region, specially around N or [Formula: see text]. Further, the role of pairing and the evolution of new shell gaps around [Formula: see text] or [Formula: see text] and 34 have been investigated, as one moves toward drip lines. This study suggests that the occupancies/vacancies of neutron/proton orbitals for lower angular momentum state plays major role in nuclear structure to create bubble-like structure and [Formula: see text]O[Formula: see text], [Formula: see text]Mg8 and [Formula: see text]Si[Formula: see text] may have dual bubble-like structures.

scholarly journals Electron Capture in Nuclear Structure and Astrophysics

2019 ◽  
Vol 18 ◽  
pp. 75
Author(s):  
P. Giannaka ◽  
T. S. Kosmas ◽  
V. Tsakstara
Keyword(s):  
Nuclear Structure ◽  
Electron Capture ◽  
Decisive Role ◽  
Numerical Approach ◽  
Mass Region ◽  
Core Collapse ◽  
Heavy Nuclei ◽  
Good Test ◽  
Computer Codes ◽  
Nuclear Structure Calculations

Electron capture on nucleons and nuclei, is one of the most important weak interaction processes in the dynamics and evolution of massive stars. Especially on nuclei of the Fe mass region the role of e− capture is crucial in the phase of stellar core collapse. Furthermore, a realistic treatment of electron capture on heavy nuclei provides signi cant information in the hydrodynamics of core collapse and bounce. In this work, we exploit the advantages of a recently published numerical approach to perform nuclear structure calculations of the electron capture in F e group nuclear isotopes. As a rst concrete example, which is simultaneously o ering a good test of ourmethod,wechoosethereaction56Fe(e−,νe)56Mn* that plays a decisive role in core collapse supernovae. We also improve the previous formalism by constructing compact analytical expressions for the required reduced matrix elements of all basic multipole operators in isospin representation. Such a compact formalism o ers the advantage of performing state-by-state calculations of the transition rates for semi- leptonic nuclear processes through advantageous computer codes written in isospin representation.

105Tc nuclear structure and systematic evolution of states of 1/2+[431] intruder band in odd-A 95, 97,99,101,103,105,107Tc isotopes

2020 ◽  
Author(s):  
Sadek ZEGHIB
Keyword(s):  
Experimental Investigation ◽  
Fermi Level ◽  
Nuclear Structure ◽  
Rotational Model ◽  
Model Calculations ◽  
Rotational Bands ◽  
Systematic Evolution ◽  
Intruder Orbital ◽  
Model Transition ◽  
Rotor Model

Previously observed negative and positive parity states of <sup>105</sup>Tc were studied in the framework of particle-rotor model. Transition properties and experimental energies were compared to the predictions of the model calculations. A systematic study of the evolution of the intruder π1/2+[413] band in the nuclear structure of odd-A Technetium isotopes <sup>95,97,99,101,103,105,107</sup>Tc is presented as well. The existence of this intruder band has been argued previously in <sup>95,97,99,101,103</sup>Tc isotopes (partially populated) and fully observed and confirmed in <sup>105</sup>Tc. It will be shown that changes in deformation and subsequently the position of Fermi level vis a vis the 1/2+[431] intruder orbital originating from the π (d<sub>5/2</sub>, g<sub>7/2</sub>) subshells predominantly affect these systematic changes. All four interpreted experimental rotational bands are naturally predicted by the rotational model as bands build on states of good Ω originating from 5/2+[422], 5/2-[303], 3/2-[301] and 1/2+[431] orbitals near the Fermi level in deformed <sup>105</sup>Tc (strong coupling). Further experimental investigation about missing data is needed for those observed low lying states in both <sup>105</sup>Tc and <sup>103</sup>Tc in order to confirm the presence of the 1/2-[301] rotational band that is well defined in lighter <sup>95,97,99,101</sup>Tc isotopes.

In search of empirical rule relating E21+ and B(E2; 01+→21+) in asymmetric even–even nuclei of mass region A = 90–120

2013 ◽  
Vol 91 (10) ◽  
pp. 777-782
Author(s):  
Yuvraj Singh ◽  
S.K. Dhiman ◽  
M. Singh ◽  
Chhail Bihari ◽  
A.K. Varshney ◽  
...  
Keyword(s):  
Mass Region ◽  
Quadrupole Deformation ◽  
Nucl Phys ◽  
Yrast Band ◽  
Transition Rates ◽  
Empirical Rule ◽  
Asymmetric Rotor ◽  
The Moment ◽  
Rotor Model ◽  
Static Quadrupole

The quadrupole deformation β are extracted independently from energy and transition rates. The set of asymmetric parameters γ are obtained from energy ratio [Formula: see text]. It is observed that the set of β values evaluated from B(E2) are closer to the values of β extracted from [Formula: see text] on considering the Grodzins empirical rule (Grodzins. Phys. Lett. 2, 88 (1962)) with uncertainty in even Mo, Ru, and Pd nuclei. The moment of inertia [Formula: see text] generating the yrast band in these nuclei is evaluated from [Formula: see text] using the asymmetric rotor model (Davydov and Filippov. Nucl. Phys. 8, 237 (1958)). The β, γ, and I0 values have good correlations with NpNn. In addition, β and I0 are related linearly in general. This systematic relate [Formula: see text] [Formula: see text] and asymmetric deformation γ that enables one to predict [Formula: see text], the static quadrupole moment Q0 and quadrupole deformation β of those nuclei whose only [Formula: see text] is known.

scholarly journals Nuclear structure of the exotic mass region along the rp process path

2005 ◽  
Vol 758 ◽  
pp. 765-768 ◽  
Author(s):  
Yang Sun ◽  
Michael Wiescher ◽  
Ani Aprahamian ◽  
Jacob Fisker
Keyword(s):  
Nuclear Structure ◽  
Mass Region ◽  
Rp Process

Nuclear structure study of some bubble nuclei in the light mass region using mean field formalism

2015 ◽  
Vol 39 (6) ◽  
pp. 064102 ◽  
Author(s):  
Mahesh K. Sharma ◽  
R. N. Panda ◽  
Manoj K. Sharma ◽  
S. K. Patra
Keyword(s):  
Nuclear Structure ◽  
Mean Field ◽  
Structure Study ◽  
Mass Region ◽  
Nuclear Structure Study ◽  
Field Formalism

103Tc nuclear structure and systematic evolution of states of g9/2 parentage in odd-A 95, 97, 99, 101, 103Tc isotopes

2015 ◽  
Vol 93 (8) ◽  
pp. 862-870
Author(s):  
Sadek Zeghib
Keyword(s):  
Fermi Level ◽  
Nuclear Structure ◽  
Strong Coupling ◽  
Systematic Study ◽  
Negative Parity ◽  
Model Calculations ◽  
Rotational Bands ◽  
Complete Study ◽  
Systematic Evolution ◽  
Rotor Model

A systematic study of the evolution of the nuclear structure (at low and medium energies) of odd-A 95–103Tc isotopes is presented. These changes are indeed affected predominantly by changes in deformation and subsequently the position of the Fermi level. Hence a complete study of previously observed positive and negative parity states (at low and medium energies) of 103Tc in the framework of the particle–rotor model is performed. Experimental energies and transition properties will be compared to those predicted by the model calculations. The systematic model calculations show that those rotational “multiplets” emerging as a result of the larger Coriolis mixing, especially among positive-parity Nilsson states of g9/2 parentage in less deformed isotopes 95, 97, 99, 101Tc, are just as natural a prediction of the model as rotational bands built on states of good Ω in well deformed 103Tc (strong coupling) as confirmed experimentally.

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