Nuclear shape evolution and shape coexistence in Zr and Mo isotopes

Kumar, Pankaj; Thakur, Virender; Thakur, Smriti; Kumar, Vikesh; Dhiman, Shashi K.

doi:10.1140/epja/s10050-021-00346-6

Cited by 14 publications

(15 citation statements)

References 54 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Marginal relation to the X(5)CPS has been found [379]. Extensive calculations [143] in [152][153][154][155][156][157][158][159][160][161][162][163][164][165][166][167][168][169][170] Yb 82-100 , performed with a 5DQCH with parameters determined from three different mean-field solutions have demonstrated the significant influence of the pairing correlations on the speed of the development of collectivity with increasing neutron number.…”

Section: The Yb (Z = 70) Isotopesmentioning

confidence: 84%

Shape Coexistence in Even–Even Nuclei: A Theoretical Overview

Bonatsos,

Martinou,

Peroulis

et al. 2023

Atoms

View full text Add to dashboard Cite

The last decade has seen a rapid growth in our understanding of the microscopic origins of shape coexistence, assisted by the new data provided by the modern radioactive ion beam facilities built worldwide. Islands of the nuclear chart in which shape coexistence can occur have been identified, and the different microscopic particle–hole excitation mechanisms leading to neutron-induced or proton-induced shape coexistence have been clarified. The relation of shape coexistence to the islands of inversion, appearing in light nuclei, to the new spin-aligned phase appearing in N=Z nuclei, as well as to shape/phase transitions occurring in medium mass and heavy nuclei, has been understood. In the present review, these developments are considered within the shell-model and mean-field approaches, as well as by symmetry methods. In addition, based on systematics of data, as well as on symmetry considerations, quantitative rules are developed, predicting regions in which shape coexistence can appear, as a possible guide for further experimental efforts that can help in improving our understanding of the details of the nucleon–nucleon interaction, as well as of its modifications occurring far from stability.

show abstract

Section: The Yb (Z = 70) Isotopesmentioning

confidence: 84%

Shape Coexistence in Even–Even Nuclei: A Theoretical Overview

Bonatsos,

Martinou,

Peroulis

et al. 2023

Atoms

View full text Add to dashboard Cite

show abstract

“…across heterojunctions’ optoelectrical solar cell device using appropriate conditions, defect models, script files, recorder setup, etc. [ 49–58 ] It is a Poisson–Schrodinger solver in one dimension which iteratively solves coupled electrostatic Poisson's and continuity equations, drift‐diffusion equation and generation–recombination profiles, using the Gummel iteration method with Newton–Ralphson substeps alongside the length of the device, at the junction under various illumination and biasing conditions. Applying relevant boundary conditions at the interfaces and different contacts, SCAPS solves the coupled differential equations in (Ψ, n , p ) or (Ψ, E Fn , E Fp ).

J_{normaln} = - \frac{μ_{normaln} n}{q} \frac{d E_{Fn}}{d x}

J_{normalp} = \frac{μ_{normalp} p}{q} \frac{d E_{Fp}}{d x}

- \frac{d J_{normaln}}{d x} - U_{normaln} + G = \frac{d n}{d t}

- \frac{d J_{normalp}}{d x} - U_{normalp} + G = \frac{d p}{d t}

\frac{d}{d x} (ε_{0} ε_{normalr} \frac{dΨ}{d x}) = - q (p - n + N_{normalD}^{+} - N_{normalA}^{-} + \frac{ρ_{def}}{q})

where Ψ is the electrostatic potential, ε 0 and ε r is the permittivity of vacuum and semiconductor, n and p are the respective carrier densities, N D + are N...…”

Section: Methodsmentioning

confidence: 99%

Bandgap Assessment of Compositional Variation for Uncovering High‐Efficiency Improved Stable All‐Inorganic Lead‐Free Perovskite Solar Cells

Prabu

Malathi

Kumar

et al. 2023

Physica Status Solidi (a)

View full text Add to dashboard Cite

The quest for suitable material technology becomes an imperative aspect of PV energy conversion applications. Pursuing ideal materials or designing efficient PV devices requires a keen understanding of underlying PV action and material properties. These include defect-free, chemically and mechanically stable, semiconductive, and absorption properties, which could be easily tuned, manipulated, and readily fabricated. The candidate for such a futuristic material could be a perovskite solar cell (PSC), which has a dramatically improved performance over the last decade. [4] Recent reports observed a steep rise in efficiency from %3% to %25.5% for Pb-based hybrid perovskites (a combination of MAPbI 3 and FAPbI 3 ). [5][6][7][8] These hybrid compositions of PSC are susceptible to long-term stability issues due to temperature, moisture exposure cycle, lead (Pb)based toxicity, and I-V hysteresis characteristics, which limit or question their practical use. [9][10][11] Therefore, the significant research gap is to find practical solutions to the Pb-toxicity and stability issue while preserving or improving the inherent performance and remarkable photophysical properties. Stability issues in hybrid organic-inorganic perovskite are severe limiting issues, mainly due to hygroscopicity, volatility, and thermal and chemical instability of organic cations. It is likely resolved by replacing the organic part with inorganic-based perovskite. [12] For addressing stability issue, organic cations such as CH 3 NH 3 þ (methylammonium, MA) and (HC(NH 2 ) 2 þ (formamidium, FA) are substituted with inorganic cations such as Cs and Rb. For addressing Pb toxicity issues, Pb is substituted with same group elements Sn and Ge. [13][14][15][16][17][18] The fully inorganic perovskite are continually explored to identify suitable replacements for Pb toxicity and MA stability issues while maintaining perovskite's superior optical properties. The inorganic absorberbased devices of CsPbI 3 have shown efficiency of 20%. [19] These inorganic absorbers perform comparatively with original hybrid organic-inorganic (MAPbI 3 , FAPbI 3 ) perovskites; however, it does not answer the lead presence issue. Sn-replaced Pb perovskites have shown high absorption and optical properties, optimal bandgap, and efficiency around 10% in FASnI 3 devices. This Sn substitution solves the Pb toxicity issues; however, Sn readily goes under oxidation from Sn þ2 to Sn þ4 , which rapidly degrades device performances and further aggravates the stability issues. Literature reports have shown that partial substitution

show abstract

“…Shape coexistence is another important and interesting feature of nuclei; nuclear shapes coexist within the tiny energy range of nuclear excitations. The almost degenerate minima are related to the low single-particle energy level density around the Fermi levels of the neutron or proton [72][73][74][75]. Yang et al [76] found that the degenerate minima are more related to quadrupole deformation than triaxial deformation.…”

Section: Shape Coexistencementioning

confidence: 99%

Bubble nuclei with shape coexistence in even-even isotopes of Hf to Hg

Choi,

Lee,

Mun

et al. 2022

Preprint

View full text Add to dashboard Cite

The shape of a nucleus is one of fundamental nuclear properties. We perform a systematic investigation of bubble nuclei that also exhibit shape coexistence in Hf, W, Os, Pt and Hg even-even isotopes using the deformed relativistic Hartree-Bogoliubov theory in continuum. For a systematic study, we first consider nuclear bubble structures and shape coexistence separately. We confirm that deformations and pairing correlations hinder bubble structures by comparing our results with those from relativistic continuum Hartree-Bogoliubov theory that assumes spherical symmetry in nuclei. We then predict candidate isotopes with both bubble structure and shape coexistence. We observe that the depletion fraction factor that characterizes bubble structure is mostly smaller in oblate deformation than in prolate, while some isotopes such as 206 Os have bubble structures both in oblate and prolate deformations. We compare the proton single-particle energy levels for the candidates of shape coexistence both with only prolate bubble structure and with prolate and oblate bubble structures.

show abstract

Nuclear shape evolution and shape coexistence in Zr and Mo isotopes

Cited by 14 publications

References 54 publications

Shape Coexistence in Even–Even Nuclei: A Theoretical Overview

Shape Coexistence in Even–Even Nuclei: A Theoretical Overview

Bandgap Assessment of Compositional Variation for Uncovering High‐Efficiency Improved Stable All‐Inorganic Lead‐Free Perovskite Solar Cells

Bubble nuclei with shape coexistence in even-even isotopes of Hf to Hg

Contact Info

Product

Resources

About