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PREFACE

In the present volume of Journal of Physics: Conference Series we publish the proceedings of the "XLI Brazilian Meeting on Nuclear Physics". The Brazilian Workshop on Nuclear Physics (RTFNB, acronym in Portuguese) is organized annually by the Brazilian Physics Society since 1978. This year, from 02-06 September, the 41th edition of this meeting was held in the Maresias Beach Hotel in the city of São Sebastião, São Paulo, Brazil. This hotel is located by the beach and it is surround by splendid natural beauty. Few steps separate the guest rooms from the beach and the ocean can be seen from any of the hotel areas. This pleasant and relaxing environment is just perfect for fruitful discussion of new projects, exchanging ideas and starting new collaborations.

The main motivation of this meeting is to promote Nuclear Physics research in Brazil, by stimulating and reinforcing collaborations between nuclear physicists from around the country together with some international invited researchers. Also, this meeting will serve to disseminate advances in nuclear physics research and its applications being performed in Brazil, disclose and evaluate the scientific production in this field and stimulate young Brazilian researchers and students in their first steps into scientific research. Also, renowned invited speakers from Brazil and from several countries present their most recent works.

All papers published in this volume of Journal of Physics: Conference Series have been peer reviewed through processes administered by the proceedings Editors. Reviews were conducted by expert referees to the professional and scientific standards expected of a proceedings journal published by IOP Publishing.

²³⁶U (T_1/2 = 23 My) is an excellent monitor for nuclear contamination in the environment. Indeed, spent nuclear fuels present isotopic ratios ²³⁶U/²³⁸U several orders of magnitude higher than natural samples. ²³⁶U also provides a useful fingerprint to identify and trace nuclear material for safeguards purposes. Here we describe a new beamline for the discrimination of ²³⁶U using the accelerator mass spectrometry (AMS) technique. This system comprises a Wien velocity filter and a 6.7 m long time-of-flight (ToF) path with a focusing quadrupole. The ToF is determined by a time zero detector and a surface barrier detector, which also provides an energy measurement. The capability of the system to discriminate ²³⁶U from the much more abundant isotopes ²³⁵U and ²³⁸U is shown. While sensitivity values of ²³⁶U/²³⁸U∼ 10⁻⁸ were achieved, ongoing works aim to improve this performance.

I briefly describe the cosmological lithium problems followed by a summary of our recent theoretical work on the magnitude of the effects of electron screening, the possible existence of dark matter parallel universes and the use of non-extensive (Tsallis) statistics during big bang nucleosynthesis. Solutions within nuclear physics are also discussed and recent measurements of cross-sections based on indirect experimental techniques are summarized.

A brief panorama is given about the status and the research activities of the LAFN - Laboratório Aberto de Física Nuclear (the "Open Nuclear Physics Laboratory"). The LAFN is an internal organization of the Nuclear Physics Department of the Institute of Physics of the University of São Paulo, São Paulo, SP, Brazil, which was created in the late 90's in order to facilitate the participation of users from other institutions in Brazil or abroad. Presently the Laboratory has more than 70 registered users, most of them active in proposing and performing experiments with the 8MV Pelletron-Tandem particle accelerator, which is a mayor nuclear physics research facility in Brazil. The experiment proposals are evaluated by a project advisory committee. It is characteristically a University based facility, with abundant participation of students, and production of several MSc and PhD theses regularly. The organizational structure of the Laboratory, and the characteristics of the Accelerator and peripherals will be described, as well as selected topics of the ongoing research both on basic and applied nuclear physics, such as nuclear structure and reaction mechanism studies with stable and radioactive beams, and tests of irradiation damage and other effects on electronic devices. Presently, the LAFN is part of the INCT-FNA ("Instituto Nacional de Ciência e Tecnologia - Física Nuclear e Aplicações"), supported by several Federal and State institutions from Brazil.

An overview of the experiments performed at RIBRAS over the last year is presented. Elastic scattering and breakup reactions induced by light exotic projectiles on different targets have been measured and some results are presented here for the ¹²⁰Sn(⁶He, α) reaction. Resonant scattering experiments have been performed with ¹⁰Be and ¹²C secondary beams on a CH₂ thick target and the well known ¹²C+p resonance was identified. A gamma-particle experiment using a new system of LYSO scintillators to detect gammas was done.

Nuclear structure and reaction theory are undergoing a major renaissance with advances in many-body methods, realistic interactions with greatly improved links to Quantum Chromodynamics, the advent of high performance computing, and improved computational algorithms. State-of-the-art two- and three-nucleon interactions obtained from chiral Effective Field Theory provide a theoretical foundation for nuclear theory with controlled approximations. With highly efficient numerical codes, tuned to the current generation of supercomputers, we can perform ab-initio nuclear structure calculations for a range of nuclei to a remarkable level of numerical accuracy, with quantifiable numerical uncertainties. Here we present an overview of recent results for No-Core Configuration Interaction calculations of p-shell nuclei using these chiral interactions up to next-to-next-to-leading order, including three-body forces. We show the dependence of the ground state energies on the chiral order; we also present excitation spectra for selected nuclei and compare the results with experimental data.

The challenge to obtain from the Euclidean Bethe–Salpeter amplitude the amplitude in Minkowski is solved by resorting to un-Wick rotating the Euclidean homogeneous integral equation. The results obtained with this new practical method for the amputated Bethe–Salpeter amplitude for a two-boson bound state reveals a rich analytic structure of this amplitude, which can be traced back to the Minkowski space Bethe–Salpeter equation using the Nakanishi integral representation. The method can be extended to small rotation angles bringing the Euclidean solution closer to the Minkowski one and could allow in principle the extraction of the longitudinal parton density functions and momentum distribution amplitude, for example.

In the late stage of relativistic heavy ion collisions there is a hadron gas phase, where particles interact at energies of the order of the temperature, i.e., ≃ 100 − 150 MeV. We discuss heavy quarkonium production and dissociation in this hot hadron gas. We review the theory giving special emphasis to our recent works on J/ψ and ϒ suppression in interactions with pions.

It is shown in this paper that the decrease of the projectile ground state binding energy in a neutron-halo nucleus and the removal of the Coulomb barrier in the proton-halo nucleus, produce a similar qualitative effect on the elastic scattering cross sections. The variation of the binding energy produces opposite effects on elastic scattering and breakup cross sections. A strongly destructive Coulomb-nuclear interference owing to the decrease of the binding energy is also obtained.

Nucleon-induced pre-equilibrium reactions are predominantly direct reactions. At low incident energies, excitation of all but the lowest energy collective states can be well described in terms of one-step reactions that produce particle-hole pairs. As the incident energy increases, the probability of exciting a nucleon to the continuum rather than to a bound particle state also increases. These knockout nucleons can escape the nucleus or induce secondary collisions that create still other continuum or bound particle-hole pairs. We discuss their role in pre-compound nuclear reactions here, first in a semiclassical Monte Carlo description of the reaction and then in a quantum one-step calculation.

The barrier distribution, originated from channel coupling effects in heavy-ion fusion reactions, has been extracted experimentally for many systems using either a fusion excitation function or an excitation function of large-angle quasi-elastic scattering. In this article, we discuss an application of the latter method to the ⁴⁸Ca+²⁴⁸ Cm system, which is relevant to hot fusion reactions to synthesize superheavy elements. To this end, we carry out coupled-channels calculations for this system, taking into account the deformation of the target nucleus, and discuss the role of deformation in a formation of evaporation residues.

The human biomonitoring, measurement of chemical and/or their metabolites in human fluids, is an important tool for assessing the health condition of subjects, included athletes. In this study, sulfur levels were investigated in blood of judo athletes using Energy Dispersive X-ray Fluorescence (EDXRF) technique. Twenty athletes participated of this study. Two groups of athletes were selected: judo with a balanced diet with multivitamin/mineral supplements consumption and judo with diet not controlled. These data were compared with the control group (subjects of the same age but not involved with physical activities). There was a significant increase of S levels in athletes with diet not controlled. These data can be useful to a well-planned nutritional proposition that can contribute to better performance of athletes.

Pulsars are modeled as neutron stars originated from the collapse of a progenitor one. In the canonical model they are described by spherical magnetized dipoles that rotate with the magnetic axis usually misaligned relative to the rotation axis, and such misalignment would explain the observation of radiation emitted in pulses in a certain direction rendering the typical observational characteristic of this kind of star. The frequency of such pulses decays with time and it can be quantified by the braking index (n). In the canonical model n = 3 for all pulsars but observational data show that n[negationslash] = 3. In this work we present a model for the understanding of the frequency decay of the rotation of a pulsar adapting the canonical one. We consider the pulsar a star that rotates in vacuum and has a strong magnetic field but, in contrast to the canonical model, we assume that its moment of inertia changes in time due to a uniform variation of a displacement parameter in time. We found that the old pulsars that present high values of the braking index tend to present smaller internal displacements of mass, in particular the superfluid neutron matter in the core. We relate this trend to neutron vortices' creep in rotating superfluids, indicating a possible reason for this coincidence.

The Bethe-Salpeter equation for three scalar bosons, with zero-range interaction, is solved in Minkowski space by direct integration of the four-dimensional integral equation. The singularities occuring in the propagators are treated properly by standard analytical and numerical methods, without relying on any ansatz for the Bethe-Salpeter amplitude. The results for the binding energies and transverse amplitudes are compared with the results computed in Euclidean space. A fair agreement between the calculations is obtained.

In this work we study the effects of an external magnetic field in the competition of chiral and diquark order parameters in cold and dense quark matter, using a SU(2) version of the NJL model. We verify the influence of the magnetic field in the phase diagram, and perform a comparison of the results obtained using a Fermi-Dirac form factor regularization with ones obtained by using a method that makes a full separation of the finite magnetic contributions and the divergencies, the Magnetic Field Independent Regularization.

In this work we evaluate the π⁰ pole-mass in the RPA approximation at finite magnetic field and temperature in the NJL SU(2) model. To this end, we employ an alternative version of the Magnetic Field Independent Regularization based on the Riemann-Hurwitz zeta function. To employ this formalism, we present a set of equations applied to the gap equation and pseudo-scalar polarization loop at the mean field approximation and random phase approximation.

In this work we use the string/gauge duality within the Softwall Model (SW). In this model a dilaton field is introduced in the action for the fields playing the role of a soft infrared (IR) cutoff. The SW model is very useful as it provides linear Regge trajectories for mesons. Here, using a 10–dimensional SW model, we calculate the corresponding structure functions for deep inelastic scattering (DIS) in which electrons are scattered off hadrons in a kinematical regime where the hadrons are broken apart, with high virtuality q, in the exponentially small x (Bjorken parameter) regime. Our results for this regime are consistent with those achieved using other holographic and non-holographic approaches.

We establish a relationship between the nucleon-nucleon interaction potential and the nuclear fusion reaction cross-sections at low energies. The axially deformed self-consistent relativistic mean field is used with the non-linear NL3* interaction parameter set. The Wong formula is used to estimate the fusion cross-section for ⁵⁸Ni + ⁵⁸Ni and ⁴⁸Ca + ²³⁸U systems, which are known to display fusion hindrance phenomena. The results of the application of the nucleus-nucleus optical potential for the fusion cross-section from the recently developed effective relativistic NN-interaction (R3Y) potential is compared with the well-known, phenomenological M3Y potential. The results obtained from our present calculation for the R3Y interaction are reasonable good as compared to the M3Y potential concerning the available experimental at barrier energies. The present analysis pursues a full microscopic studies of fusion process at low energies by taking the R3Y potential along with the relativistic mean field density instead of taking the M3Y interaction within the double folding approach.

The Mössbauer spectroscopy is proposed as an alternative experimental technique to be pursued in the detection of Coherent Elastic ν-Nucleus Scattering (CENNS). The neutrino transferred energy in the neutrino-nucleus interaction causes a perturbation at the nuclear level structure of the Mössbauer isotope, leading to a displacement of the isomeric peak of the electromagnetic resonance. We calculate this isomeric shift correction due to the occurrence of CENNS and show that this quantity can be measured with enough precision in a typical Mössbauer spectroscopic experiment. We also shown that a reasonable number of events is expected and allow to extract the correction in the isomeric shift in a typical neutrino reactor flux. This isomeric shift correction is pointed out as a figure of merit for signature of CENNS in our proposal.

This work aims to study the effects of ionizing radiation on a half-wave rectifier circuit. The diodes of the circuit, rectifier and Zener, were exposed to X-rays of 10 keV of effective energy. The characteristic curves of both diodes were evaluated before and after being subjected to cumulative total ionizing dose (TID) effects. The accumulation of charges in the dielectric structures of the diodes alter their individual functionalities, but the changes verified in the rectification were irrelevant. In this study, three irradiation methods were used to correlate the physical mechanisms responsible for the effects caused by radiation with variations in the electrical parameters of the devices and the efficiency of the rectifier circuit.

In this work, we present a facility to study errors in digital devices exposed to thermal neutrons from a beam hole in the IEA-R1 nuclear reactor, as well as the long-lived isotopes produced in the irradiation of digital electronic devices under a slow neutron field. Preliminary results obtained with the analysis of a 28nm SRAM-based Xilinx Zynq-7000 FPGA are presented.

Evaluation of Sodium in sweeteners is important in nutritional investigations and for consumers: excessive sodium consumption is one of the major risk factors, responsible for hypertension and cardiovascular diseases. In this study, twelve brands acquired in markets of São Paulo city were analysed by Instrumental Neutron Activation Analyses technique (INAA). The aim was to verify compliance with ANVISA recommendation in relation to sodium level. The results were compared with the amounts recommended and with the tolerable intake limit (< 0.4 g/kg). The sodium concentration in sweeteners samples showed low content for most of the brands. The results shown that for the general population, it is not risk.

Medicinal plant extracts are mostly used in different kinds of products in different areas, such as pharmaceutical, cosmetic, food and veterinary, being employed in different dosages and applications. It is known that the metabolism of the human body is regulated by the presence or absence of certain chemical elements. Some elements enter vital functions, such as potassium and calcium. Potassium helps in muscle contractions, especially of the heart muscle, and calcium enters as an specific element in the bone composition. Some other elements like heavy metals (As, Hg, Cd, and Pb) are highly toxic to the human body, even at quite low concentrations. Therefore, there is the need to investigate the chemical composition of plants and medicinal extracts, because the presence of some elements in levels concentrations, as well as the deficiency of others, can lead to a series of metabolic disorders in the human body. The main objective of this study was to evaluate the chemical composition of plants and extracts of medicinal plants, using the Energy Dispersive X-Ray Fluoresce (EDXRF) technique, to assessing the chemical composition of plants and extracts. The qualitative and quantitative chemical elements investigated in the plants and extracts were: As, Cr, Cu, Fe, Ni, Zn, Si, P, S, Cl, K, Ca, Ti, V, Mn, Co, Rb, Zr, Cd, Sn, Ba, Hg, Pb, Bi, Mo, Pd, and Pt.

Star This study proposes an investigation of ions in whole blood of the dystrophic animal model SJL/J (mice strain with dysferlin protein deficiency) and in the control group (C57BL/6J) using the Energy Dispersive X-ray Fluorescence (EDXRF) spectrometry technique. The comparison between control and dystrophic mice results shown an increase in blood for P, S, K and Fe (p < 0.05) while a decrease in Ca (p < 0.05). This elemental analysis will contribute to evaluate the best diagnostic, care and treatment procedures, for the Progressive Muscular Dystrophy.

The main purpose of this study is to predict the induced activity of ¹⁶⁷Ho produced by ¹⁶⁵Ho(n,γ)^166mHo(n,γ)¹⁶⁷Ho, ¹⁶⁵Ho(n,γ)¹⁶⁶Ho(n,γ)¹⁶⁷Ho and ^166mHo(n,γ)¹⁶⁷Ho reactions to choose the best path to measure the cross section with lowest uncertainty. The activation and decay scheme was established starting from the ¹⁶⁵Ho target and considering single, double and triple neutron capture reactions. The activity results were deduced from differential activation equations and decay rates for all reaction products. The calculations were performed considering samples which were taken from a stock solution supplied by the Electrotechnical Laboratory (Japan) for purposes of an international comparison.

In this work, we present the first results of static tests in a 28nm SRAM under thermal neutron irradiation from the IPEN/IEA-R1 research reactor. The SRAM used was the configuration memory of a Xilinx Zynq-7000 FPGA and the ECC frame was used to detect bit-flips. It was obtained a SEU cross-section of 9.2(21) × 10⁻¹⁶cm²/bit, corresponding to a FIT/Mb of 12(5), in accordance with expected results. The most probable cause of SEU in this device are ¹⁰B contamination on tungsten contacts.

In this study, ions of clinical relevance in non-stimulated human whole saliva obtained from healthy subject's donors (adults and children) at São Paulo city (Brazil), were investigated. The Instrument Neutron Activation Analysis (INAA) and Energy Dispersive X-Ray Fluorescence (EDXRF) techniques were used. The comparison concentration between adults and children for Cl, K, Ca and Fe showed significant differences for all elements, emphasizing the need of adopting different reference values.

Pulsars are stars from which electromagnetic radiation is observed to pulsate in well-defined time intervals as the star rotates and the emission of eletromagnetic signal is located in a place different from the rotation center. The frequencies of the pulses decay with time, quantified by the braking index (n). In the canonical model n = 3, in general, for all pulsars, but observational data shows that n is lower than 3. In this work a new model is presented, based on a modification of the canonical one incorporating the influence of neutron and proton density that appear in the superfluid core and, as the star cools down, the density of the superfluid core increases making the star to shrink with time and temperature, making the inertia moment to decrease. The difference ot this model from the canonical one is that the star moment of inertia decreases with time (what would accelerate the rotation of the star) what makes the star to not slow down as fast as it should without this process.

Neutrino production is the dominant cooling process in neutron stars. After the rapid cooling during the protoneutron star stage, the neutron star crust is formed. Neutrinos continue to be produced in the crust, which can escape from the surface. This neutrino production is an important process to the final cooling phase of the star. They are produced in the crystalline lattice formed by nuclei permeated by an electronic gas. Quantum oscillations of the electron density with respect to the lattice of nuclei generates plasmons, which decay in a pair of neutrinos. Many works have studied the plasma of the nucleus in the star, however, without incorporating the effect of the lattice in the crust of the neutron star. The objective of this work is to include the lattice in the calculation of the plasmon decay rate using quantum field theory at finite temperature. It is not common to find studies on the crystalline lattice of the star using quantum field theory and the calculations generally used for neutrino emissivity consider a homogeneous and isotropic medium, which can not be directly applied in the context of neutron star crust.

Angular distributions for elastic scattering of radioactive ¹²B projectile on ⁵⁸Ni target have been measured for the first time. They were obtained at two energies, E_Lab = 30.0 and 33.0 MeV, close to the Coulomb barrier. These angular distributions were analyzed with the conventional optical model using Woods-Saxon shape and double-folding São Paulo potentials. The total reaction cross sections were extracted from this analysis and compared with other similar masses systems.

In this work we present an elastic scattering angular distribution for the ⁸Li+⁵⁸Ni system measured at E_lab = 26.1 MeV. The ⁸Li beam was produced in the Radioactive Ion Beams in Brasil (RIBRAS) facility using the ⁷Li primary beam delivered by the 8-UD Pelletron accelerator. The angular distribution covers the angular range from 20 to 85 degrees in the center of mass frame. The data have been analysed by optical model and coupled channels calculations, including couplings to low-lying states in ⁸Li and the spin-orbit interaction. Our results indicate that the inclusion of the spin-orbit interaction in the calculations is important to describe the data at backward angles.

The Polyakov-Nambu-Jona-Lasinio (PNJL) model is a model that incorporates confinement effects in the Nambu-Jona-Lasinio (NJL) model through the addition of the Polyakov loop (Φ). These effects are studied at finite temperature regime. However, at zero temperature its modified Fermi-Dirac distributions become step functions and Φ disappears from the equations of state (EOS), as well as the Polyakov potential, leading the model to the conventional form of the NJL model. In this work we propose a variation of the PNJL model where all the couplings depend on Φ with the constraint that the interactions vanish at the deconfinement phase where Φ reaches its maximum value and the quarks behave as free particles. In this approach, coupling constants of original PNJL model become now dependent on Φ. As a consequence, all equations of state present a dependence even at zero temperature regime. The thermodynamics of this new model is discussed.

On the scope of the nonextensive statistical model for the nucleon's structure function, we propose that gluons may occupy a bigger volume than the quarks, in nucleons. This correction is needed to fit the carry out momentum of each kind of particle. At the end of the work, we notice that the radius was not the only variable to be changed to get the goal of momentum adjustment and the another constraints.

In this work, we study relativistic heavy ion collisions by using a hydrodynamic model for both ideal and viscous cases to investigate the influence of dissipative effects on the elliptic flow and HBT interferometry. We conclude that the bulk viscosity has small influence in hydrodynamic calculations. However, our results show that the shear effects are important for describing the experimental data in central collisions.

In characterizing the strongly coupled QCD system produced in nuclear collisions an important uncertainity is the initial state, in particular the role of nuclear and subnuclear scale fluctuations in small systems. In this regard, the d-Au collision is a potentially unique probe since the deuterium nucleus contains only two nuclei, allowing potentially to separate nucleonic and sub-nucleonic dynamics from multiplicity cuts. We investigate this possibility via the PHOBOS Glauber Monte Carlo program. We calculate geometric quantities of the initial state of an ultra-relativistic collision between a deuterium and a gold nucleus, and systematically examine the relationship between geometry and experimental observables.

Supersymmetry at a susy harmonic oscillator, H(ω₁, ω₁), can be broken or restored in certain conditions and parameters, that are linked with thermal interaction and with a polynomial interactions of creation and annihilation operators. All possibles supersymmetric harmonic oscillators represented by a point (ω₁, ω₁) in the frequency space of the system, are in a two dimensional surface parametrized by the (ω₂, α₂), which we call s-surface, where α₂ is the interaction parameter. The temperature in the s-surface are intended to be zero. Interaction with the thermal bath represented by the tilde Hilbert space from the doubling Hilbert space, establishes thermal oscillations that push the system from the s-surface. In such a way we can define the set of all supersymmetric harmonic oscillator or in a equivalent way the s-surface as a global standard reference for zero temperature.

Nucleon-induced pre-equilibrium reactions are important in many applications of nuclear physics. About 20% of the particles emitted in such reactions are composites, such as deuterons and alpha particles. Deuterons are produced through emission from the compound nucleus, as well as through two important direct reaction mechanisms - "pick-up" and coalescence. Iwamoto and Harada developed a semi-classical pre-equilibrium model that describes both direct mechanisms as a generalization of coalescence. We have implemented the Iwamato and Harada unified model of deuteron emission in Blann and Chadwick's hybrid Monte Carlo model. This implementation was made in order to analyse data of reactions of the type (p,d), that is, proton induced reactions having deuterons as emitted particles, but our previous results were not satisfactory. In order to find a new approach for the deuteron emission, we are investigating an eikonal approximation to the phase space of Iwamoto and Harada model. We are also comparing our angular distributions with the experimental ones using DWUCK4. Nevertheless, our results are not satisfactory yet and our work is under development.

The unstable nuclei ⁶²Ge and ⁶⁴Ge are analyzed in terms of the α + core structure applying a nuclear potential with (1 + Gaussian)×(W.S. + W.S.3) shape. The ground state bands of ⁶²Ge and ⁶⁴Ge and first negative parity band of ⁶⁴Ge are calculated and compared with experimental data. The calculated ⁶⁴Ge ground state band gives a good account of the experimental energies from 0⁺ to 8⁺ state. The rms intercluster separations and B(E2) transition rates are obtained for the ⁶⁴Ge ground state band and a discussion is presented.

In this work, the delta-rich hadronic stellar matter condensate is studied in the context of a relativistic mean field calculation for hadrons and mesons using the nonlinear Walecka (NLW) and Zimanyi-Moszkowski (ZM) models. Considering different values of delta-mesons coupling constants we present the delta matter effect in the equation of state in each of these models. Solving numerically the Tolman-Oppenheimer-Volkoff (TOV) equation, we obtain the maximum neutron star mass. We note that the NLW model provides a stiffer equation of state when compared to the ZM model for the same values of delta-mesons coupling constants, and as a consequence gives more massive neutron stars.

The core longitudinal momentum distributions in two-neutron stripping reactions for halo nuclei of ²⁰C and ²²C are computed and compared to the experimental data obtained by detecting the core nucleus. The three-body wave function from the zero-range renormalized model is used as input in our calculations. We approximate the wave function of the projectile with a three-body structure, namely neutron-neutron-core, to an effective two-body one by integrating over neutron-neutron relative distance, such that the one has a core-dineutron wave function. The eikonal approximation is used in the description of the fragment-target interactions where the São Paulo optical potential is used for modeling the core-target and a Woods-Saxon potential is used for the dineutron-target interaction.

A new Skyrme parametrization was developed based on a shortlist of Skyrme forces. These selected parameterizations, 16 in total, were found in a comprehensive study involving 240 parametrizations submitted to constraints related to nuclear matter properties. The critical parameters associated with the liquid-gas phase transition, critical density, critical pressure, and critical temperature are calculated for this new parametrization as well as its flash point.

The present work analyzes the α + core structure in ¹⁰⁴Te using the local potential model. The α + core interaction is described by a nuclear potential of (1 + Gaussian)×(W.S. + W.S.³) shape. The energy levels, total α widths and rms intercluster separations are determined for the ground state band and compared with a previous calculation which uses a double-folding potential. The two potential forms produce similar spectra between the 0+ and 14+ states. The antistretching effect is predicted for the ¹⁰⁴Te ground state band, as is observed in previous α + core calculations in intermediate mass nuclei. An α-decay half-life T_1/2,α ≈ 3 ns is predicted for ¹⁰⁴Te in the α-decay energy Qα ≈ 5.36 MeV using an α preformation factor P = 1. The calculated T_1/2,α value is compatible with the recently reported experimental result on α-decay of ¹⁰⁴Te.

Accurate level densities are an important ingredient in the calculation of compound nucleus emission cross sections. They are often approximated numerically using the saddle point approximation to the canonical level density obtained from the grand canonical partition function using the inverse Laplace transform. Here, we use a modified version of the saddle-point approximation proposed by Rossignoli to obtain canonical level densities and average properties of a system. However, the level density needed in nuclear reaction calculations is actually the energy-conserving microcanonical one. For simple systems, the latter can be calculated combinatorially. Here we calculate microcanonical level densities using an evenly-spaced single particle density for one type of nucleon and compare these to saddle-point canonical level densities obtained from the same single-particle density. The simplest continuous approximation to the microcanonical level density describes it well near its peak but poorly at low excitation energies. The canonical level density obtained from the partition function fares somewhat better but is still not completely successful. It tends to exceed the exact result by a few percent. We discuss the differences between the canonical and microcanonical level densities and suggest how these might be reduced.

In this work, we revisit the study published in [Dutra et al., Chinese Physics C 42, 064105 (2018)] where 34 consistent relativistic mean-field models were analyze at the nuclear matter constraints in relation to the role of short-range correlations in the calculation of the symmetry energy and its consequence on the value of the gamma parameter.

In this work a small software suite for the reduction and analysis of coincidence data collected using CAEN's proprietary software was developed. These software check the output files for coincidences, generate a single list mode file with the coincident events, build histograms for each input, plus a time difference histogram and a 2-detector data matrix, perform time gates and allows for the subtraction of accidental coincidences, and perform energy gating on the final data matrices, generating histograms with the gated spectra. Moreover, the suite has an integrator that guides the user through all the required steps.

MOSFETs are subject to different types of Single-Event Effects (SEEs) induced by heavy ions, with low-voltage MOSFETs being more susceptible to non-destructive effects, such as Single-Event Transients, than high-voltage MOSFETs which may also be susceptible to destructive effects. In this paper an experimental setup used to study SEEs in power MOSFETs at the São Paulo 8UD Pelletron accelerator and computational simulations for SEE cross section calculations in low-voltage MOSFETs are presented.