scholarly journals Binary and Ternary Fragmentation Analysis of 252Cf Nucleus using Different Nuclear Radii

2021 ◽  
Vol 9 (1) ◽  
pp. 55-59
Author(s):  
Nitin Sharma ◽  
Manoj K. Sharma
Keyword(s):  
Radius Vector ◽  
Radioactive Nucleus ◽  
Nuclear Potential ◽  
Ternary Fission ◽  
Decay Modes ◽  
Shell Effects ◽  
Fragmentation Behavior ◽  
Nuclear Stability ◽  
Binary Splitting

Pioneering study reveals that a radioactive nucleus may split into two or three fragments and the phenomena are known as binary fission and ternary fission respectively. In order to understand the nuclear stability and related structure aspects, it is of huge interest to explore the fragmentation behavior of a radioactive nucleus in binary and ternary decay modes. In view of this, Binary and ternary fission analysis of 252Cf nucleus is carried out using quantum mechanical fragmentation theory (QMFT). The nuclear potential and Coulomb potential are estimated using different versions of radius vector. The fragmentation structure is found to be independent to the choice of fragment radius for binary as wellas ternary decay paths. The deformation effect is included up to quadrupole (β2) with optimum cold orientations and their influence is explored within binary splitting mode. Moreover, the most probable fission channels explore the role of magic shell effects in binary and ternary fission modes. 

scholarly journals Study of High-Energy Fission in Inverse Kinematics

2019 ◽  
Vol 223 ◽  
pp. 01037
Author(s):  
G. Mantovani ◽  
D. Ramos ◽  
M. Caamaño ◽  
A. Lemasson ◽  
M. Rejmund ◽  
...  
Keyword(s):  
Kinetic Energy ◽  
Excitation Energy ◽  
Shell Structure ◽  
Inverse Kinematics ◽  
High Energy ◽  
Total Kinetic Energy ◽  
High Excitation Energy ◽  
High Excitation ◽  
Shell Effects

Fission at low excitation energy, is a process in which both macroscopic and microscopic aspects are involved. Some features in the total kinetic energy and in the N/Z distributions of the fragments, commonly associated with shell effects, came out in a series of recent experiments with high excitation energy fusionfission reactions in inverse kinematics. In the latest experiment of this campaign, a study of high-energy fission and quasi-fission between a 238U beam and a series of light targets was carried out by using the aforementioned technique, in order to probe the role of the shell structure in these processes.

Dynamics of 16,18O-induced reactions using Ni, Ge and Mo targets

2016 ◽  
Vol 25 (11) ◽  
pp. 1650091 ◽  
Author(s):  
Rajni ◽  
Gurvinder Kaur ◽  
Manoj K. Sharma
Keyword(s):  
Cross Sections ◽  
Fusion Cross Section ◽  
Cluster Decay ◽  
Cross Section Data ◽  
Orientation Degree ◽  
Decay Modes ◽  
Section Data ◽  
Collective Clusterization ◽  
Good Agreement

Dynamical cluster decay model (DCM) based on the collective clusterization approach is employed to explore the dynamics of various even-mass Zr isotopes formed in [Formula: see text]O-induced reactions. In reference to the measured fusion cross-section data, various decay modes contributing towards [Formula: see text]Zr[Formula: see text] nuclei are investigated. Also, the role of deformations and orientation degree of freedom is analyzed by comparing results with spherical choice of fragmentation. In addition to this, the effect of entrance channel is explored for [Formula: see text]Zr[Formula: see text] and [Formula: see text]Kr[Formula: see text] nuclei formed in [Formula: see text]O and [Formula: see text]O-induced reactions. Besides this, the dynamics of relatively heavier mass Sn isotopes is exercised using [Formula: see text]O and [Formula: see text]O projectiles. The DCM calculated decay cross-sections find good agreement with available experimental data.

NUCLEAR POINT-GROUP SYMMETRIES AND NEW IDEAS ABOUT NUCLEAR STABILITY: AN OVERVIEW

2009 ◽  
Vol 18 (10) ◽  
pp. 2155-2159
Author(s):  
J. DUDEK ◽  
D. CURIEN ◽  
A. GÓŹDŹ ◽  
K. MAZUREK
Keyword(s):  
Mean Field Theory ◽  
Point Group ◽  
Mean Field ◽  
Shell Effects ◽  
Nuclear Stability ◽  
Particle Spectra ◽  
New Ideas ◽  
Group Symmetries ◽  
Nuclear Shell ◽  
Nuclear Shell Effects

The nuclear mean-field theory and the group representation theory can be used to optimise the search for strong nuclear shell effects. The two theories allow to correlate the symmetry aspects with the presence of large gaps in the single-particle spectra, facilitate in this way the conditions of search for strong nucleonic- and nuclear-binding and thus for an increased nuclear stability. In this article we give a short overview of the related on-going research, focussing on the results of the TetraNuc Collaboration.

scholarly journals Emerging roles of DYRK2 in cancer

2020 ◽  
pp. jbc.REV120.015217
Author(s):  
Vasudha Tandon ◽  
Laureano de la Vega ◽  
Sourav Banerjee
Keyword(s):  
Tumour Suppressor ◽  
26S Proteasome ◽  
Heat Shock Factor 1 ◽  
Lung Cancers ◽  
Nuclear Stability ◽  
Spatio Temporal ◽  
Temporal Interactions

Over the last decade, the CMGC-kinase, DYRK2, has been reported as a tumour-suppressor across various cancers triggering major anti-tumour and pro-apoptotic signals in breast, colon, liver, ovary, brain, and lung cancers, while lower DYRK2 expression apparently correlated with poorer prognosis in patients. Contrary to this, various medicinal chemistry studies reported robust anti-proliferative properties of DYRK2 inhibitors while unbiased ‘omics’ and GWAS based studies identified DYRK2 as a highly overexpressed kinase in various patient tumour samples. A major paradigm shift occurred in the last four years when DYRK2 was found to regulate proteostasis in cancer via a two-pronged mechanism. DYRK2 phosphorylated and activated the 26S proteasome to enhance degradation of mis-folded/tumour-suppressor proteins while also promoting the nuclear stability and transcriptional activity of its substrate, heat-shock factor 1 (HSF1) triggering protein folding. Together, DYRK2 regulates proteostasis and promotes pro-tumorigenic survival for specific cancers. Indeed, potent and selective small molecule inhibitors of DYRK2 exhibit in vitro and in vivo anti-tumour activity in triple negative breast cancer (TNBC) and myeloma models. Thus, with conflicting and contradictory reports across different cancers, the overarching role of DYRK2 remains enigmatic. Specific cancer (sub)types coupled to spatio-temporal interactions with substrates could decide the pro- or anti-cancer role of DYRK2. The current review aims to provide a balanced and critical appreciation of the literature-to-date highlighting top substrates such as p53, c-Myc, c-Jun, HSF1, proteasome or NOTCH1, to discuss DYRK2 inhibitors available to the scientific community, and to shed light on this duality of pro- and anti-tumorigenic roles of DYRK2.

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.

Systematic of alpha decay half-lives: role of quantization condition

2021 ◽  
pp. 1-9
Author(s):  
M. Hosseini-Tabatabaei ◽  
S.A. Alavi ◽  
V. Dehghani
Keyword(s):  
Alpha Decay ◽  
Tunneling Probability ◽  
Quantization Condition ◽  
Nuclear Potential ◽  
Mean Square ◽  
Mean Square Deviation ◽  
Wkb Method ◽  
Saxon Potential ◽  
Alpha Emitters

Using the semiclassical WKB method and considering the WKB quantization condition, the alpha decay half-lives of 420 alpha emitters were calculated with eight forms of the proximity and Woods–Saxon type potentials. The effect of quantization condition on the nuclear potential, effective potential, assault frequency, tunneling probability, alpha decay half-life, and root mean square deviation between theory and the experiment were investigated. Significant differences between calculated half-lives with and without inclusion of the quantization condition were observed specially for proximity potentials. By including the quantization, the Woods–Saxon potential was found as the best potential for even–even, even–odd, odd–even, odd–odd, and all alpha emitters. The quantization condition normalized the nuclear potentials. Therefore, by considering this condition, the thirteen forms of the prox77 potential with different sets of the surface energy and surface asymmetry constants gave the same results. This result was justified with two sets of parameters.

scholarly journals Coronin 1A depletion restores the nuclear stability and viability of Aip1/Wdr1-deficient neutrophils

2019 ◽  
Vol 218 (10) ◽  
pp. 3258-3271
Author(s):  
Charnese Bowes ◽  
Michael Redd ◽  
Malika Yousfi ◽  
Muriel Tauzin ◽  
Emi Murayama ◽  
...  
Keyword(s):  
Cell Death ◽  
Actin Filaments ◽  
Essential Role ◽  
Actin Dynamics ◽  
Actin Binding ◽  
Zebrafish Embryos ◽  
Actomyosin Contractility ◽  
Nuclear Stability

Actin dynamics is central for cells, and especially for the fast-moving leukocytes. The severing of actin filaments is mainly achieved by cofilin, assisted by Aip1/Wdr1 and coronins. We found that in Wdr1-deficient zebrafish embryos, neutrophils display F-actin cytoplasmic aggregates and a complete spatial uncoupling of phospho-myosin from F-actin. They then undergo an unprecedented gradual disorganization of their nucleus followed by eruptive cell death. Their cofilin is mostly unphosphorylated and associated with F-actin, thus likely outcompeting myosin for F-actin binding. Myosin inhibition reproduces in WT embryos the nuclear instability and eruptive death of neutrophils seen in Wdr1-deficient embryos. Strikingly, depletion of the main coronin of leukocytes, coronin 1A, fully restores the cortical location of F-actin, nuclear integrity, viability, and mobility of Wdr1-deficient neutrophils in vivo. Our study points to an essential role of actomyosin contractility in maintaining the integrity of the nucleus of neutrophils and a new twist in the interplay of cofilin, Wdr1, and coronin in regulating F-actin dynamics.

Probable spontaneous decay modes of 254Es radioactive nucleus

2021 ◽  
Author(s):  
Nitin Sharma ◽  
Vishal Parmar ◽  
Amandeep Kaur ◽  
Manoj K. Sharma
Keyword(s):  
Radioactive Nucleus ◽  
Spontaneous Decay ◽  
Decay Modes

scholarly journals A “nuclear” potential of the informational blow-up

2017 ◽  
pp. 94-103
Author(s):  
Alexei Leontiev
Keyword(s):  
Information Technologies ◽  
Blow Up ◽  
Wide Spectrum ◽  
Nuclear Potential ◽  
Information Redundancy ◽  
Non Profit ◽  
Artificial Brain ◽  
Financial Interests ◽  
Potential Impact

This paper deals with the developing computer and information technology in terms of their impact upon a wide spectrum of vital values of humans. The potential impact of computers is compared with the capacity of the most powerful weapon. The thesis is substantiated that libraries, together with other non-profit steady structures, may become a victim of modern information technologies that are promoting financial interests of manufacturers. A role of "artificial brain" technologies under present conditions of information redundancy is discussed.

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