scholarly journals THE GAMOW-TELLER RESPONSE IN DEFORMED NUCLEI

2006 ◽  
Vol 15 (07) ◽  
pp. 1397-1406 ◽  
Author(s):  
P. SARRIGUREN ◽  
R. ÁLVAREZ-RODRÍGUEZ ◽  
O. MORENO ◽  
E. MOYA DE GUERRA
Keyword(s):  
Nuclear Astrophysics ◽  
Double Beta Decay ◽  
Β Decay ◽  
Hartree Fock ◽  
Decay Properties ◽  
Medium Mass ◽  
Deformation Dependence ◽  
Gamow Teller ◽  
Strength Distributions

We study Gamow-Teller strength distributions within a QRPA approach performed on top of a deformed Skyrme-Hartree-Fock+BCS single particle basis with the inclusion of residual spin-isospin interactions in both particle-hole and particle-particle channels. We focus our attention in several problems of interest in Nuclear Structure and Nuclear Astrophysics, such as the β-decay properties of proton-rich medium-mass nuclei of astrophysical interest and the deformation dependence of the Gamow-Teller strength distributions in neutron deficient Pb isotopes. We also discuss the role of deformation in the two-neutrino double beta decay.

scholarly journals Exotic structure and decay of medium mass nuclei near the drip lines

2019 ◽  
Vol 21 ◽  
pp. 59
Author(s):  
A. Petrovici
Keyword(s):  
Nuclear Astrophysics ◽  
Shape Evolution ◽  
Shape Coexistence ◽  
Β Decay ◽  
Effective Interactions ◽  
Structure And Dynamics ◽  
Medium Mass ◽  
Model Spaces ◽  
Gamow Teller ◽  
Structure Properties

Properties of medium mass nuclei near the drip lines are not only relevant for nuclear structure, but are of high interest in nuclear astrophysics and in several applications, in particular nuclear technology. Shape coexistence effects play an essential role in the structure and dynamics of proton-rich A∼70 nuclei and neutron-rich A∼100 nuclei. Results concerning a self-consistent description of exotic phenomena including Gamow-Teller β-decay of proton-rich nuclei, triple shape coexistence and shape evolution in the N=58 Sr and Zr isotopes as well as Gamow-Teller β-decay strength distributions and structure properties of neutron- rich nuclei relevant for reactor decay heat obtained in the frame of the complex Excited Vampir model using realistic effective interactions in large model spaces will be presented.

scholarly journals Electron-capture and beta-decay modes with realistic nuclear structure calculations

2012 ◽  
Vol 20 ◽  
pp. 112
Author(s):  
P. G. Giannaka ◽  
T. S. Kosmas
Keyword(s):  
Excited States ◽  
Meson Exchange ◽  
Exchange Potential ◽  
Β Decay ◽  
Decay Modes ◽  
Nuclear Structure Calculations ◽  
Analytical Expressions ◽  
Structure Calculations ◽  
Gamow Teller

In this work, we concentrate on the e-capture and β-decay processes in isotopes that are important for searching the explosive nucleosynthesis in massive stars. To this aim, we improved our codes which use compact analytical expressions for the required reduced matrix elements of all basic multipole operators (isospin repre- sentation). The ground state of the nuclear isotopes chosen, is constructed in the context of the BCS method while their excited states are calculated by solving the QRPA equations, using as residual two-body interactions that of the Bonn C-D one-meson exchange potential. We focus on the role of the charged Gamow-Teller and Fermi transitions in Fe group nuclei that are the main constituents of the core in presupernovae formation.

scholarly journals Realistic shell model description of beta decay

2018 ◽  
Vol 194 ◽  
pp. 02007
Author(s):  
Angela Gargano ◽  
Luigi Coraggio ◽  
Luca De Angelis ◽  
Tokuro Fukui ◽  
Nunzio Itaco
Keyword(s):  
Shell Model ◽  
Beta Decay ◽  
Electric Quadrupole ◽  
Double Beta Decay ◽  
Model Description ◽  
Β Decay ◽  
Decay Properties ◽  
Model Study ◽  
Many Body Perturbation Theory ◽  
Transition Operators

In this paper, we extend our previous realistic shell-model study of Gamow-Teller strengths and double-β decay properties for nuclei around 132Sn to lighter mass nuclei. The effective shell-model Hamiltonian and transition operators are microscopically derived by way of many-body perturbation theory, without resorting to empirical parameters. Our main aim is to further check the reliability of our approach and verify its stability in other mass regions. Calculated energy spectra as well as electric-quadrupole and β-decay properties are presented for 76Ge and 82Se and compared with the experimental data, together with some results for 130Te and 136Xe already reported in our previous paper. Finally, some preliminary results of nuclear matrix elements responsible for the neutrinoless double beta decay, calculated by using the bare operator, are shown.

The role of radioactive ion beams in nuclear astrophysics

2013 ◽  
Vol T152 ◽  
pp. 014011 ◽  
Author(s):  
Karlheinz Langanke ◽  
Hendrik Schatz
Keyword(s):  
Nuclear Astrophysics ◽  
Ion Beams ◽  
Radioactive Ion Beams

scholarly journals Role of Single-Particle Energies in Microscopic Interacting Boson Model Double Beta Decay Calculations

Universe ◽  
2021 ◽  
Vol 7 (3) ◽  
pp. 66
Author(s):  
Jenni Kotila
Keyword(s):  
Beta Decay ◽  
Single Particle ◽  
Field Potential ◽  
Double Beta Decay ◽  
Interacting Boson Model ◽  
Model Calculations ◽  
Single Particle Level ◽  
Particle Level ◽  
Boson Model

Single-particle level energies form a significant input in nuclear physics calculations where single-particle degrees of freedom are taken into account, including microscopic interacting boson model investigations. The single-particle energies may be treated as input parameters that are fitted to reach an optimal fit to the data. Alternatively, they can be calculated using a mean field potential, or they can be extracted from available experimental data, as is done in the current study. The role of single-particle level energies in the microscopic interacting boson model calculations is discussed with special emphasis on recent double beta decay calculations.

Moments of inertia and B(E2;01+→21+)s in the NpNn scheme

2015 ◽  
Vol 93 (7) ◽  
pp. 711-715
Author(s):  
Rajesh Kumar ◽  
S. Sharma
Keyword(s):  
Nuclear Structure ◽  
Strong Dependence ◽  
Moment Of Inertia ◽  
Nucleon Pair ◽  
Valence Nucleon ◽  
Moments Of Inertia ◽  
Ground Band ◽  
Neutron Interaction ◽  
Medium Mass

We examine the collective nuclear structure of light and medium mass (Z = 50–82, N = 82–126) even–even nuclei using valence nucleon pair product (NpNn). We discuss the role of proton–neutron interaction in light mass nuclei and illustrate the variation of observables of collectivity and deformation (i.e., ground band moment of inertia) and B(E2) values with N and NpNn). The plot of these observables against NpNn vividly displays the formation of isotonic multiplets in quadrant I, strong dependence on NpNn in quadrant II and weak constancy with Z in quadrant III is illustrated.

scholarly journals Global predictions for astrophysics applications

2020 ◽  
Vol 13 ◽  
pp. 18
Author(s):  
P. Demetriou
Keyword(s):  
Nuclear Reaction ◽  
Cross Sections ◽  
Nuclear Reactions ◽  
Nuclear Astrophysics ◽  
Reaction Network ◽  
Reaction Rates ◽  
Reaction Cross ◽  
Hartree Fock ◽  
Microscopic Models ◽  
The Stability

Nuclear reaction rates play a crucial role in nuclear astrophysics. In the last decades there has been an enormous effort to measure reaction cross sections and extensive experimental databases have been compiled as a result. In spite of these efforts, most nuclear reaction network calculations still have to rely on theoretical predic- tions of experimentally unknown rates. In particular, in astrophysics applications such as the s-, r- and p-process nucleosynthesis involving a large number of nuclei and nuclear reactions (thousands). Moreover, most of the ingredients of the cal- culations of reaction rates have to be extrapolated to energy and/or mass regions that cannot be explored experimentally. For this reason it is important to develop global microscopic or semi-microscopic models of nuclear properties that give an accurate description of existing data and are reliable for predictions far away from the stability line. The need for more microscopic input parameters has led to new devel- opments within the Hartree-Fock-Bogoliubov method, some of which are presented in this paper.

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