Half-life for two-proton radioactivity of emitter nuclides mass number A<70 has been calculated by using a phenomenological, effective liquid drop model (eldm) which applied successfully to one-proton radioactivity, alpha decay, cluster and cold fission processes. Following this approach, we estimate half-life values several 2p-emitted compare our results with predictions from other models, as well the existing data in literature, specifically cases 16Ne, 19Mg, 45Fe, 48Ni, 54Zn 67Kr parent...

Within the metric formalism of $f(R)$ theories gravity, where $R$ is Ricci scalar, we study hydrostatic equilibrium structure compact stars with inclusion anisotropic pressure. In particular, focus on $f(R)= R^{1+\epsilon}$ model and examine small deviations from General Relativity (GR) for $\vert \epsilon \vert \ll 1$. A suitable definition mass function explicitly formulated field equations value scalar at center each star chosen such that it satisfies asymptotic flatness requirement. We...

As a potential candidate for the late-time accelerating expansion of Universe, Chaplygin gas and its generalized models have significant implications to modern cosmology. In this work we investigate effects dark energy on internal structure neutron star composed two phases, which leads us wonder: Do stable stars dark-energy core? To address question, focus radial stability stellar configurations by core---described Chaplygin-type equation state (EOS)---and an ordinary-matter external layer...

The present model describes the exotic decay of nuclei by considering molecular phase fragments in an effective liquid drop description process. Shell corrections are included via experimental values energy released disintegration (Q value), which is used to define surface tension drop. Coulomb potential exact solution Poisson equation for a uniform charge distribution nuclear volume. inertial coefficient barrier penetrability problem determined using Werner-Wheeler approximation velocity...

A semiempirical model based on the quantum-mechanical tunnelling mechanism of alpha emission from nuclei has been used to systematize alpha-decay half-lives a set 336 nuclides, comprising all alpha-emitter nuclides whose T1/2α-data for ground-state transitions mutual angular momentum l = 0 are known. With minimum data rejection (only ~5% cases), procedure successful in reproducing quite satisfactorily (within factor ~2) most cases (~80%) investigated. few significant discrepancies found...

Volume measurements of maxillary sinus may be useful to identify diseases affecting paranasal sinuses. However, literature shows a lack consensus in studies measuring the volume. This attributable different computed tomography data acquisition techniques, segmentation methods, focuses investigation, among other reasons. Furthermore, methods for volumetrically quantifying are commonly manual or semiautomated, which require substantial user expertise and time-consuming. The purpose present...

Abstract We investigate compact objects in modified teleparallel gravity with realistic equations of state. propose a modification Teleparallel Equivalent to General Relativity, then an appropriate tetrad is applied the field equations. A specific set relations showing equivalency between our gravitational model and New Relativity found. The conservation equation implies that Tolman-Oppenheimer-Volkoff are presented effective coupling constant. Numerical analysis using state made, behavior...

Two main goals are pursued in this work. The first one is concerned with the relativistic effects high energy nuclear collisions, when noninvariance of simultaneity taken into account. It shown that time ordering nucleon-nucleon collisions quite different for observers, giving some cases noninvariant final results intranuclear cascade calculations. In particular, we have an example such a case, which simulation, depending on reference frame, presents kind density instability caused by...

Abstract We provide the modified TOV equations for hydrostatic equilibrium of charged compact stars within metric f ( R ) gravitational background. adopt MIT bag model EoS dense matter and assume a charge distribution where electric density ρ ch is proportional to standard energy . Using Starobinsky model, we explore role αR 2 term, α free constant Ricci scalar, on global properties such as radius, mass total charge. present dependence structure star several values different parameter β ≡ /...

A new approach to the intranuclear cascade model for relativistic heavy-ion reactions is presented. The effect of nucleon concentration on collision process explicitly included. It found that contributions from nonbinary processes are far being negligible. Such shown broaden angular distribution inclusive proton spectra $^{20}\mathrm{Ne}$+ $^{238}\mathrm{U}$ head-on collisions.

The two-step process that characterizes the intermediate- and high-energy photonuclear reactions (between 40 MeV 4 GeV) has been successfully described by Monte Carlo calculations. Recently, a new class of codes capable to perform those calculations according more realistic method developed, improving possibilities for simulating in details. In this work we present CRISP package (standing Rio–São Paulo Collaboration), which is coupling multi collisional (MCMC) evaporation–fission (MCEF)...

In this work, we performed a systematic study of the α-decay process by employing Bayesian neural network approach. The Qα-value prediction ten parameter Duflo-Zuker mass model has been improved from root-mean-square deviation relative to experimental data σ = 0.43 MeV 0.122 MeV. This correction brought light some missing physical aspects in DZ model, so as identify magic numbers not present original model. By using phenomenological effective deal with alpha decay half-lives, were able...

We analyze the recent experimental data on photofissility for ${}^{237}\mathrm{Np}$, ${}^{238}\mathrm{U}$, and ${}^{232}\mathrm{Th}$ at incident photon energies above $200\mathrm{MeV}$. For this analysis, we developed a Monte Carlo algorithm nuclear evaporation process in photonuclear reactions. This code is used association with multicollisional model photon-induced intranuclear cascade process. Our results show good quantitative qualitative agreement data. It shown that emission of protons...

In this Brief Report we extend the \ensuremath{\alpha}-decay half-life calculation to superheavy emitter region verify whether these nuclei satisfy recently observed systematics [D. N. Poenaru et al., Phys. Rev. C 83, 014601 (2011);C. Qi 80, 044326 (2009)]. To establish systematics, have used \ensuremath{\alpha}-cluster potential description, which was originally developed study $\ensuremath{\alpha}$ decay in connection with nuclear energy level structure [B. Buck 51, 559 (1995)]. The...

We use the recently developed MCMC/MCEF (multicollisional Monte Carlo plus for evaporation-fission calculations) model to calculate photofissility and photofission cross section at intermediate energies ${}^{243}\mathrm{Am}$ ${}^{209}\mathrm{Bi},$ compare them results obtained other actinides available experimental data. As expected, are close those ${}^{237}\mathrm{Np}.$ The fissility preactinide nuclei is nearly one order of magnitude lower than that actinides. Both ${}^{209}\mathrm{Bi}$...

The energy dependence of photofission cross section for heavy nuclei has recently been well described in terms a Monte Carlo calculation at energies from the pion photoproduction threshold up to 1 GeV [see, instance, A. Deppman et al., Phys. Rev. Lett. 87 (2001) 182701]. Recent experimental data CLAS (CEBAF Large Angle Spectrometer) collaboration have extended measured 3.5 actinide and preactinide nuclei. In this work we address photoabsorption sections above GeV, region where shadowing...

High-mass compact stars have been reported recently in the literature, providing strong constraints on properties of ultra dense matter beyond saturation nuclear density. In view these results, calculations quark star or hybrid equilibrium structure must be compatible with provided observational data. But since equations state used describing are general too soft comparison equation states to describe hadronic matter, calculated models presented literature not suitable explain stability...

Recent experiments have shown that the multimode approach for describing fission process is compatible with observed results. A systematic analysis of parameters obtained by fitting fission-fragment mass distribution to spontaneous and low-energy data has values those present a smooth dependence upon nuclear number. In this work, new methodology introduced studying fragment distributions through approach. It induced energetic probes (E > 30 MeV) fissioning nuclei produced during intranuclear...

A systematic study based on the Bayesian Neural Network (BNN) statistical approach is introduced to improve predictive power of current nuclear mass formulae when applied nuclides not yet experimentally detected. In a previous work by present authors, methodology was considering only Duflo-Zuker model (Duflo J. and Zuker A., Phys. Rev. C, 52 (1995) R23) explore S uperH eavy E lements (SHE) region, with focus α-decay process. Due discrepancy among different we decided extend in calculation...