Serkan Akkoyun

Sivas Cumhuriyet University · Department of Physics

With the fission barrier height information, the survival probabilities of super-heavy nuclei can also be reached. Therefore, it is important to have accurate knowledge of fission barriers, for example, the discovery of super-heavy nuclei in the stability island in the super-heavy nuclei region. In this study, five machine learning techniques, cubi...

There are many radioisotopes used for diagnostic and therapeutic purposes in nuclear medicine. One of the radioisotopes used for diagnostic purposes is 82Rb. It is used in positron emission tomography (PET) as to be positron emitter and commonly obtained from 82Sr/82Rb generator. In this study, we have investigated some possible production mechanis...

Q_\beta$ represents one of the most important factors characterizing unstable nuclei, as it can lead to a better understanding of nuclei behavior and the origin of heavy atoms. Recently, machine learning methods have been shown to be a powerful tool to increase accuracy in the prediction of diverse atomic properties such as energies, atomic charges...

In this study, we have estimated the (n,2n) reaction cross-section for 14.6 MeV incident neutron energy by using the artificial neural network (ANN) method. We have also predicted the reaction cross-sections whose experimental data are not available in the literature. For the construction of the present ANN, available experimental data in the liter...

In this study, Artificial Neural Network (ANN) model has been proposed to characterize the annealed and the non-annealed Schottky diode from experimental data. The experimental current values of Ni/n-type 6H–SiC Schottky diode for the voltages applied to the diode terminal starting from 80 K with 20 K steps up to 500 K temperature were measured for...

One of the main ingredients in nuclear structure studies using shell model are the single-particle energy (spe). In order to obtain these values accurately, experimental data is needed. The region around the doubly magic nuclide 100Sn is very interesting for nuclear studies in terms of structure, reaction and nuclear astrophysics. Experimental spec...

One of the successes in describing the nuclear structure correctly is taking into account the spin–orbit interaction. Thus, single-particle energies and nuclear magic numbers can be obtained accurately. The main subject of this study is to investigate how the strength of this spin–orbit interaction affects the nuclear structure, more specifically t...

The region around the doubly magic nuclide Sn100 is very interesting for nuclear physics studies in terms of structure, reaction, and nuclear astrophysics. The main ingredients in nuclear structure studies using the shell model are the single-particle energies (spe) and the two-body matrix elements. To obtain the former, experimental data of Sn101...

For the activation of the target nucleus, bremsstrahlung photons generated in a medical linear accelerator can be used. Due to particle separation energy limitations for low photon energies in the giant resonance region ([Formula: see text]18[Formula: see text]MeV), the reaction exit channels are restricted to the ejection of one or two particles o...

The patellofemoral joint is one of the parts of the knee extension mechanism that plays a role in the stability of the knee by enlarging the force arm of the quadriceps muscle and changing the direction of the muscle strength. For the entire knee joint to perform its task painlessly and functionally, the positions and strength of the muscles, the s...

The region around the doubly magic nuclide $^{100}Sn$ is very interesting for nuclear physics studies in terms of structure, reaction and nuclear astrophysics. The main ingredients in nuclear structure studies using the shell model are the single-particle energies and the two-body matrix elements. To obtain the former, experimental data of $^{101}S...

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The first excited 2+ energy states of nuclei give much substantial information related to the nuclear structure. All excited states of nuclei are shown regularities in spin, parity, and energy, including these levels. In the even–even nuclei, the first excited state is generally 2+, and the energy values of them increase as the closed shells are ap...

The cross-sections for (n, p) reactions around 14 MeV are important for nuclear research field and applications of nuclear energy. Also these neutron-induced reactions have been extensively studied in the literature. In this study, we have theoretically estimated the (n, p) reaction cross-section of different elements for 14.5 MeV incident neutron...

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Radioactivity can be found at different levels in various environments such as soil, rock, water food and in air. In principle, the source of environmental radioactivity can be classified into two groups named natural and manmade. Natural radiation sources can have cosmic or terrestrial origin. Terrestrial radiation sources originate from primordia...

Monitoring of the distribution of environmental radioactivity is very important for public health. One of the most important problems in determining the distribution of environmental radioactivity in a region is the inability to estimate the activity levels of intermediate stations that have not been measured. The classical methods only provide inf...

In this study, for the first time, in particular to astrophysics and fusion studies, how atomic nuclei embedded in the plasma environment are affected by plasma are systematically analysed. The related interactions in plasma environments considered as Debye and quantum plasma are depicted by more general exponential cosine screened Coulomb (MGECSC)...

In this study, for the first time, the velocity‐dependent potential (VDP) effects on the total refractive index changes (TRICs) and the total absorption coefficients (TACs) of the parabolic quantum dot with spherical confinement, generated by GaAs/GaAlAs heterostructure, are comprehensively investigated. In order to obtain the subband energy spectr...

Nuclear systems near nucleon drip lines have great importance in studying nucleon–nucleon force properties. However, such unstable systems have few experimental data. Due to technical development in recent years, new experimental data assembly provides huge information to analyze possible observation of new phenomena. In the aim of exploring proton...

In this work, some spectroscopic calculations are realised in order to understand the nuclear properties: Spectra and Electromagnetic properties of elements in the south east part of the nuclear chart. The study is based on the three body effect in the vicinity of 78Ni doubly magic core. The calculations are carried out in the frame work of the nuc...

The fusion-barrier distribution is very sensitive to the structure of the colliding nuclei such as nuclear quadrupole and hexadecapole deformation parameters and their signs. If the nuclei that enter the fusion reaction are deformed, the barrier problem becomes complicated. Therefore the deformation parameters are taken into account in the calculat...

Nuclear structures of the atomic nuclei can be theoretically investigated by using nuclear shell model. Generally, a doubly closed-shell nucleus has been considered as inert core and the nucleons outside the core are taken into account in the calculation. It is assumed that the nucleons in the inert core do not move but each valance nucleon out of...

One of the common methods used to investigate the nuclear structures of atomic nuclei is the nuclear shell model. Similar to the placement of atomic electrons into orbits, in the nuclear shell model, protons and neutrons are thought to fill the orbits within the nucleus, following the principle of Pauli's exclusion. These orbits are grouped togethe...

The photonuclear reactions which is induced by high-energetic photon are one of the important type of reactions in the nuclear structure studies. In this reaction, a target material is bombarded by photons with the energies in the range of gamma-ray energy scale and the photons can statistically be absorbed by a nucleus in the target material. In o...

The first excited 2+ energy states of nuclei give many substantial information related to the nuclear structure. Including these levels, all excited states of nuclei are shown regularities in spin, parity and energy. In the even-even nuclei, the first excited state is generally 2+ and the energy values of them increase as the closed shells are appr...

The nuclear shell model is one of the successful models in theoretical understanding of nuclear structure. If a convenient effective interaction can be found between nucleons, various observables such as energies of nuclear states are accurately predicted by this model. The basic requirements for the shell model calculations are a set of single par...

Accurate determination of total fusion and fusion-evaporation reaction cross-sections is an important task in experimental nuclear physics studies. In this study, we estimated the total fusion cross-sections and, as an example, one of the particular channels (2n) cross-sections for different reactions by using artificial neural network (ANN) method...

Bu çalışmada, fpg kabuk çekirdekleri için kullanılan iki cisim matris elemanlarının üretilmesi için yapay sinir ağı yöntemi kullanılmıştır. Bu amaçla, jj44b etkileşim Hamiltonian’i, kaynak olarak kabul edilmiştir. Yeni Hamiltonian'ın oluşumundan sonra, hem orijinal hem de yeni üretilen etkileşimin her ikisi de nötronca zengin Zn izotopları üzerinde...

In this study, the artificial neural network method has been employed for the generation of the new two-body matrix elements which is used for pfg shell nuclei. For this purpose, jj44b interaction Hamiltonian has been considered as a source. After the generation of the new Hamiltonian, both, original and new generated, are tested on proton-rich Zn...

Accurate determination of fusion-evaporation reaction cross section is important in experimental nuclear physics studies. In this study, by using artificial neural network (ANN) method, we have estimated the cross section values for different reactions. The related root mean square errors have been obtained as 18.5 and 110.4mb for training and test...

Spins of nuclear states (J) and multipolarities of gamma rays are usually investigated by the angular distribution of gamma rays emitted from aligned states formed by nuclear reactions. In the case of partial alignment, attenuation coefficients are used in angular distribution function. These coefficients are tabulated in literature for different J...

Gama ışınlarının multipolariteleri ve nükleer durumların spinleri, genelliklle, nükleer reaksiyonlarla oluşturulan hizalanmış durumlardan yayılan gama ışınlarının açısal dağılımı ile incelenir. Geçişlerin farklı multipolarite değerleri için, dağılım farklı özellikler göstermektedir. Dağıtım, farklı spinler ve çok kutupluluklar için literatürdeki ta...

The relativistic mean field (RMF) model with a small number of adjusted parameters has been used successfully in the last thirty years for predictions of various ground-state nuclear properties of nuclei. In this model, Dirac and Klein–Gordon like equations obtained from application of variation principle on phenomenological Lagrangian density are...

The neutrons have been captured by Erbium nuclei which were received by using clinical electron linear accelerator. In this experiment, the possibility of the neutron capture process has been observed because of emitted neutrons appearing in the experimental area. In particular, neutron capture of ¹⁷⁰Er nucleus has been observed. After the neutron...

Intrinsic high nonlinearity in experimentally measured laser scattering intensities poses significant difficulties in analyzing various molecular and optical properties of nematic liquid crystals (NLCs). In this respect, as we theoretically proved in a previous paper, universal nonlinear function approximator layered feedforward neural network (LFN...

The ground-state properties of 64Ge, 68Se, 72Kr and 76Sr (N=Z) nuclei have been investigated by using Hartree-Fock-Bogolibov (HFB)method with Sly4 Skyrme forces and Relativistic Mean Field (RMF) model with NL3 and recently proposed DEFNE interaction parameters sets. For determination of ground-state axially deformed shape and quadrupole moment cons...

Bu çalışmanın amacı, kanin diş kökü uzunluğu ve servikal genişliğinin yapay bir sinir ağı yöntemi (ANN) ile tahmin edilmesinin fizibilitesini araştırmaktır. Bilgisayarlı tomografilerin (BT) panoramic görüntüleri ile rasgele 120 hasta değerlendirildi. 120 örnekten 96'sı (% 80) eğitim fazında, 24'ü (% 20) randomize bir seçimden sonra test aşamasında...

The Relativistic Mean Field (RMF) model with a small number of adjusted parameters is powerful tool for correct predictions of various ground-state nuclear properties of nuclei. Its success for describing nuclear properties of nuclei is directly related with adjustment of its parameters by using experimental data. In the present study, the Artifici...

Photon induced reactions are called as photonuclear reactions and used in many research fields of nuclear science and nuclear physics. The photonuclear data are used in many nuclear applications such as radiation shielding and protection, radiation transport analyses, reactor core design, activation analysis and nuclear waste transmutation. In the...

Semi-empirical mass formula of the atomic nucleus describe binding energies of the nuclei. In the simple form of this formula, there are five terms related to the properties of the nuclear structure. The coefficients in each terms can be determined by various approach such as fitting on experimental binding energy values. In this study, the surface...

Özet. Bu çalışmada çift-çift 124-134Xe çekirdekleri için Relativistik Ortalama Alan (RMF) Modeli kullanılarak taban durum nükleer özellik hesaplamaları yapılmıştır. Bu çekirdekler için RMF+DDM2 etkileşmesi ile taban durum bağlanma enerjileri için deneysel değerlere çok yakın sonuçlar elde edilmiştir. Triaxiall simetriye dayalı hesaplamalar yapılara...

In this paper radiation yields for electrons in various absorbing material water, Carbon, Aluminum, Copper, Lead and Uranium in the initial electron energy range between 10 keV to 1 GeV have been estimated. For this purpose artificial neural network method has been used. It has been seen that the results are in good agreement with the available the...

Photonuclear reactions are important tools in the understanding of the nucleus. These reactions are also interesting for realizing the element creation processes in stellar environment. The use of bremsstrahlung photons generated from clinic linear accelerator is practical for performing these type of reactions. In this study, the bremsstrahlung ph...

Hem teorik hem de deneysel bakış açısıyla, super ağır bölgenin özelliklerini anlamak için, buradaki çekirdeklerin alfa bozunum özelliklerini incelemek oldukça ilgi çekicidir. Nükleer fizikteki pek çok olguda başarılı sonuçlar veren yapay sinir ağları (YSA), super ağır çekirdeklerin deneysel alfa bozunum enerjileri üzerinde kullanılmış ve Sg, Bh ve...

Boehler’s angle has a great importance in diagnosis and treatment of calcaneus bones fractures. In this study, Boehler’s angle was estimated by using artificial neural network method. This angle was obtained from 51 well-preserved calcaneus bones which was previously measured in anatomy laboratory at Cumhuriyet University. The data values for estim...

The transfermium isotopes has gained great attention in terms of experimental studies after predicting of the presence in 1960s and then starting to be synthesized in the laboratory. These süper-heavy nuclei, have been studied theoretically extensively in parallel to the experimental studies. Due to the structure of the relativistic spin-orbit inte...

The photon induced reactions which are named as photonuclear reactions have a great importance in many field of nuclear, radiation physics and related fields. The crosssections of neutron (photo-neutron (γ,xn)) and proton (photo-proton (γ,xn)) productions after photon activation have been calculated by using TALYS 1.2 computer code in this study. T...

We have run an experiment to determine the energy levels and half-lives of Gallium nucleus by using the photonuclear reactions with end-point energy of 18 MeV bremsstrahlung photons, produced by a clinical linear accelerator. As a result of 71 Ga(γ,n) 70 Ga and 69 Ga(γ,n) 68 Ga photonuclear reactions, the energy levels and half-lives of 70 Ga and 6...

Femora are a well preserved section of the skeleton after death. Therefore, they are commonly used in the field of forensic sciences, physical anthropology and anatomy. In addition, femur morphometry is helpful in finding sex or side (left or right) differences. The femur also shows characteristics of certain populations. Femur length is important...

The reduced electric quadrupole transition probability (B(E2)↑) between 0+ ground state and 2+ state in nuclei is an important quantity because it represents basic nuclear information on energies of low-lying levels in the nuclei. It provides knowledge about deformation of nuclei. In this study, the B(E2)↑ values of some even-even nuclei in 110 ≤ A...

We search for leptophilic gauge boson Zl via the process e+e- →μ+μ- at ILC with . In the leptonic extension of SM (SUC(3)×SUW(2)×UY(1)×Ul′(1)) we have predicted that ILC with will enable searching Zl with masses up to the center-of-mass energy if the related coupling constant gl exceeds 10-3 for 3σ observations and 5σ discovery. Furthermore similar...

Accurate information about the fission barrier is important for studying of the fission process. Fission barrier is needed for discovering the island of stability in superheavy region and searching of the superheavy elements. Furthermore, the astrophysical r-process is closely related to the fission barrier of the neutron-rich nuclei. In this study...

Süperağır çekirdekler için öncelikli bozunum modları, alfa yayınlanması ve kendiliğinden fisyondur. Diğer bir önemli mod ise, gama yayınlanması ile yarışan, dönüşüm elektron yayınlanmasıdır. Dönüşüm elektronlarının gama ışınlarına oranı olarak bilinen iç dönüşüm katsayıları, teorik ve deneysel nükleer yapı çalışmalarında önemlidir. Bu katsayılar de...

The patients may show various patellar order samples. Patellofemoral disorders are defined in all cases with patellofemoral pain syndrome. Right and left knees belonging to the 60 men and 60 women volunteers were measured. By using the distances from the measurements, ligamentum patellae (LP) angle was estimated by artificial neural network (ANN) m...

Femur is well preserved section of the skeleton after death. Therefore, they are commonly used in the field of forensic sciences, physical antropology and anatomy. Besides, femur morphopetry is helpful in finding gender or side differences and characteristics of the skeleton among the populations. The femur length is important for calculation of i...

One of the fundamental ground-state properties of nuclei is binding energy. Artificial neural networks (ANN) have been performed to obtain binding energies of nuclei based on the data calculated from Hartree–Fock–Bogolibov method with two Skyrme forces SLy4 and SKP. ANN has been employed to obtain two-neutron and two-proton separation energies of n...

Nuclear shape transition has been actively studied in the past decade. In particular, the understanding of this phenomenon from a microscopic point of view is of great importance. Because of this reason, many works have been employed to investigate shape phase transition in nuclei within the relativistic and non-relativistic mean field models by ex...

The K hindrance to the γ decay is studied in the warm rotating 174W nucleus, focusing on the weakening of the selection rules of the K quantum number with increasing excitation energy. 174W was populated by the fusion reaction of 50Ti (at 217 MeV) on a 128Te target, and its γ decay was detected by the AGATA Demonstrator array coupled to a BaF2 mult...

Investigations of superheavy elements (SHE) have received much attention in the last two decades, due to the successful syntheses of SHE. In particular, α-decay of SHEs has a great importance because most synthesized SHE have α-decay and the experimentalists have evaluated the theoretical predictions of the α-decay half-life during the experimental...

Constrained Hartree-Fock-Bogoliubov theory with SLy5 Skyrme force has been applied for even-even 142−164 Nd isotopes to investigate the structural evolution of Nd isotopic chain. In this work, ground-state energies and charge radii of Nd isotopes have been carried out as in good agreement with the experimental data. The systematic investigation of...

Parameters of widely used nuclear rms charge radius formulas have been refitted based on the latest experimental data for about 900 nuclei. It has been seen that the new parameters in the formulas give better results than the previous ones. Besides, an N 1/3 -dependent formula has been proposed and discussed. This formula gives effective results fo...

Proper selection of neutron exit channels following heavy-ion reactions is important in nuclear structure physics. A knowledge of detector counts versus number of neutron interaction points per event can be useful in this selection. In this paper, we constructed layered feedforward neural networks (LFNNs) consistent empirical physical formulas (EPF...

In gamma-ray spectroscopy, a number of neutrons are emitted from the nuclei together with the gamma-rays and these neutrons influence gamma-ray spectra. An obvious method of separating between neutrons and gamma-rays is based on the time-of-flight (tof) technique. This work aims obtaining tof distributions of gamma-rays and neutrons by using feed-f...

Gamma rays and neutrons, emitted following spontaneous fission of 252Cf, were measured in an AGATA experiment performed at INFN Laboratori Nazionali di Legnaro in Italy. The setup consisted of four AGATA triple cluster detectors (12 36-fold segmented high-purity germanium crystals), placed at a distance of 50 cm from the source, and 16 HELENA BaF2...

Constrained relativistic mean field theory (RMF) has been employed for analysis of the shape phase transitions of even–even 52−66 Cr isotopes. The systematic investigation of ground-state shape evolution between spherical U(5) and γ -unstable O(6) for these nuclei has been carried out by using the potential energy curves (PECs) obtained from the ef...

Artificial neural networks (ANN) have emerged with successful applications in nuclear physics aswell as inmany fields of science in recent years. In this paper, ANN have been employed on experimental nuclear charge radii. Statistical modeling of nuclear charge radii using ANN are seen to be successful. Based on the outputs ofANNwe have estimated a...