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2021 ◽  
Author(s):  
De-Xing Zhu ◽  
Hong-Ming Liu ◽  
Yang-Yang Xu ◽  
You-Tian Zou ◽  
Xi-Jun Wu ◽  
...  

Abstract In the present work, considering the preformation probability of the emitted two protons in the parent nucleus, we extend the Coulomb and proximity potential model (CPPM) to systematically study two-proton (2p) radioactivity half-lives of the nuclei close to proton drip line, while the proximity potential is chosen as Prox.81 proposed by Blocki et al. in 1981. Furthermore, we apply this model to predict the half-lives of possible 2p radioactive candidates whose 2p radioactivity is energetically allowed or observed but not yet quantified in the evaluated nuclear properties table NUBASE2016. The predicted results are in good agreement with those from other theoretical models and empirical formulas, namely the effective liquid drop model (ELDM), generalized liquid drop model (GLDM), Gamow-like model, Sreeja formula and Liu formula.


2021 ◽  
pp. 2150036
Author(s):  
O. A. P. Tavares ◽  
E. L. Medeiros ◽  
M. L. Terranova

A simple, semi-empirical, one-parameter calculation model based on the quantum mechanical tunneling mechanism through a potential barrier has been used to estimate the partial [Formula: see text]-decay half-life, [Formula: see text], of [Formula: see text] isomer. Alpha-transitions to levels of the ground-state band [Formula: see text] of [Formula: see text] have been considered, and the contributions to [Formula: see text] due to overlapping, Coulomb, and centrifugal barriers have been detailed in each case. Results have indicated a [Formula: see text]-value of [Formula: see text] and a predominance [Formula: see text] of [Formula: see text]-particles populating the level [Formula: see text], compatible with results by other authors. Besides, a single, universal-like formula to estimate half-life of alpha transitions, whatever [Formula: see text]-value and the characteristics of the parent nucleus (e-e, e-o, o-e and o-o nuclei, whether in the ground or isomeric states), has been envisaged.


2021 ◽  
Vol 33 (12) ◽  
pp. 2896-2918
Author(s):  
Rakesh Singh ◽  
Harpreet Kaur ◽  
Pankaj Gupta

A large number of heterocyclic compounds with five membered rings as the parent nucleus such as tetrazoles, imidazoles, triazoles, oxadiazoles, thiadiazoles, thiazoles, etc. have been studied extensively owing to their fascinating biological properties like anticancer, antifungal, antimicrobial, antitumor, anticonvulsant, antiviral, etc. 1,2,3-Triazoles are important class of five-membered biologically active heterocyclic compounds as they exhibit wide range of pharmacological activities. Triazoles are of two types viz. 1,2,3-triazole and 1,2,4-triazole. These compounds have drawn great attention from chemists and biologists since their discovery. In recent years, triazoles has emerged as an interesting field in drug design for many researchers due to their enormous pharmacological scope. The present review aims to sum up the medicinal significance of 1,2,3-triazoles as one of the most significant structures for the development of drug molecules like anticancer, antibacterial, HIV protease inhibitors, antifungal, anti-inflammatory (COX-1/COX-2 inhibitors), antiprotozoal, anticonvulsant, antioxidant and others, which are under clinical trials. Various benzyl and benzyl-halide functionalized 1,2,3-triazole derivatives like rufinamide, mubritinib (TAK-165) and suvorexant showing excellent biological activities have been used as medicine. In present review, more stress has been laid on the major developments in the therapeutic aspects of triazole pharmacophore for the last two decades.


2021 ◽  
Vol 256 ◽  
pp. 00010
Author(s):  
Mihail Mirea

The fine structure of α-decay is treated with fission-like models. The single particle levels are calculated along a least action path connecting the ground state of the parent nucleus and the configuration of two spherical tangent nuclei. The probabilities to find different seniority-1 configurations are obtaining by solving the time-dependent pairing equations generalized by including the Landau-Zener effect and the Coriolis coupling. The theoretical results for the α-decay of 211Po and 211Bi are compared with experimental data showing a good agreement.


2020 ◽  
Vol 16 (5) ◽  
pp. 58-62
Author(s):  
Md. ATHAR SHADIQUE ◽  
◽  
PANSHU PRATIK ◽  
PRAPHULLA KUMAR SINGH ◽  
◽  
...  

he vibrational spectroscopy, such as FTIR has been used to measure the vibrational modes of fluoroquinolones, provides information about structural differences of its individual members. Form the interpreted spectral data Ciprofloxacin has been distinguished by the presence of different substituents in their parent nucleus. FTIR study provides the most direct and definitive identification of fluoroquinolone and offer a means for qualitative analysis of newly synthesized fluroquinolone drug-Ciprofloxacin. Ciprofloxacin is an antibiotic used to treat a number of bacterial infections. This includes bone and joints infection intra abdominal infection certain types of infectious diarrhea, respiratory tract infection skin infections, typhoid fever and urinary tract infections.


2020 ◽  
Vol 29 (02) ◽  
pp. 2050008 ◽  
Author(s):  
S. S. Hosseini ◽  
H. Hassanabadi ◽  
Dashty T. Akrawy ◽  
Ali H. Ahmed

The half-life of a parent nucleus of Astatine isotopes [Formula: see text] decaying via alpha emission is investigated by employing Coulomb and proximity potential model (CPPM) using the WKB barrier penetration probability and other different analytical and semiempirical formulae of Royer, AKRE, Akrawy, RoyerB, MRoyerB, MRenB, SemFIS, VS and SLB. In the calculation of Alpha decay (AD) half-life the available experimental and theoretical [Formula: see text]-values with the total alpha kinetic energy have been considered. The behavior of hindrance factor with the variation of mass numbers of parent nuclei for isotopes in the range [Formula: see text] and the effect of magic number at closed shells were investigated. Through the comparison of obtained results from the systematics with the experimental data, the prediction of SemFIS formula was the best among the studied ones where it shows the minimum standard deviation of 0.829881.


2019 ◽  
Vol 28 (08) ◽  
pp. 1950067
Author(s):  
I. Sreeja ◽  
M. Balasubramaniam

A model-independent and [Formula: see text]-dependent four parameter formula has been recently proposed for the studies of one proton and two proton radioactivity. The same form of the formula with different parameter sets worked well for 1p and 2p emission indicating the fact that the similar phenomenological law is able to successfully reproduce both 1p as well as 2p emission half-lives suggesting the identical descriptions of these phenomena. Retaining the same form of the formula, its applicability is studied in this work for calculating the ground state as well as excited state [Formula: see text] emission. For this study, we consider 22 odd–odd nuclei, 31 odd–even nuclei, 52 even–odd nuclei, 88 even–even nuclei with the parent nucleus charge numbers in the range of [Formula: see text], [Formula: see text], [Formula: see text], and [Formula: see text], respectively. For each of these subsets the emission of [Formula: see text] with different angular momentum values are considered. The general formula with four different parameter sets is proposed and the obtained results are compared with the experimental data. The study reveals that the general form of the proposed empirical formula is suitable for calculating the half-lives of 1p, 2p and [Formula: see text]-emission with different [Formula: see text]-values. With very minimal input like [Formula: see text]-values, and charge number of the daughter nucleus, this formula can be used as a handy tool for a systematic study as well as to plan new experiments.


2019 ◽  
Vol 28 (07) ◽  
pp. 1950049
Author(s):  
L. I. Abou-Salem ◽  
K. E. Abdelmageed ◽  
I. A. Elmashad ◽  
R. Al Allam

In this work, the spectra of some even–even isotopes are studied by selecting core-cluster decomposition of the parent nucleus. The considered nuclei lie in the rare-earth and the transition metal regions. The Schrödinger equation can be solved using Bohr–Sommerfeld relation and the modified Woods–Saxon beside Coulomb potentials to reproduce the spectra of these isotopes with mass number [Formula: see text]. The theoretical calculations of the excitation energies of the ground state rotational band are compared to the experimental data. The cluster model calculations show a good agreement with the experimental data for the transitional and rotational nuclei more than the vibrational nuclei. Some negative parity bands of the chosen nuclei are studied. The core-cluster charge products are correlated with the transition probability [Formula: see text].


2019 ◽  
Vol 28 (06) ◽  
pp. 1950041 ◽  
Author(s):  
R. R. Swain ◽  
B. B. Sahu ◽  
P. K. Moharana ◽  
S. K. Patra

We have examined the binding energy, root-mean-square radii and two neutrons separation energies for the recently accepted super-heavy element [Formula: see text] established as Og using the axially deformed relativistic mean field (RMF) model with NL3 force parameter set. The calculation is extended to various isotopes of [Formula: see text] element, starting from [Formula: see text] till [Formula: see text]. The most stable isotope is found to be at [Formula: see text]. Also, the [Formula: see text]-decay energy [Formula: see text] and hence the half-lives [Formula: see text] is carried out by taking three different empirical formulae for the [Formula: see text]-decay chains of [Formula: see text] supporting the possible shell closure at daughter nuclei [Formula: see text] and/ or 184 and at parent nucleus of [Formula: see text] with [Formula: see text].


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