Yazar "Ergun, A." seçeneğine göre listele
Listeleniyor 1 - 12 / 12
Sayfa Başına Sonuç
Sıralama seçenekleri
Öğe Effect of a low gonadotrophin releasing hormone antagonist dose on in-vitro fertilization outcomes(OXFORD UNIV PRESS, 2012) Kerimoglu, O. Secilmis; Ercan, C. M.; Keskin, U.; Korkmaz, C.; Duru, N. K.; Ergun, A.[Abstract not Available]Öğe Formation of hypernuclei in evaporation and fission processes(AMER PHYSICAL SOC, 2016) Botvina, A. S.; Buyukcizmeci, N.; Ergun, A.; Ogul, R.; Bleicher, M.; Pochodzalla, J.There are excellent opportunities to produce excited heavy hyperresidues in relativistic hadron and peripheral heavy-ion collisions. We investigate the disintegration of such residues into hypernuclei via evaporation of baryons and light clusters and their fission. Previously these processes were well known for normal nuclei as the decay channels at low excitation energies. We have generalized these models for the case of hypermatter. In this way we make extension of nuclear reaction studies at low temperature into the strange sector. We demonstrate how the new decay channels can be integrated in the whole disintegration process. Their importance for mass and isotope distributions of produced hyperfragments is emphasized. New and exotic isotopes obtained within these processes may provide a unique opportunity for investigating hyperon interaction in nuclear matter.Öğe Influence of angular momentum and Coulomb interaction of colliding nuclei on their multifragmentation(AMER PHYSICAL SOC, 2015) Ergun, A.; Imal, H.; Buyukcizmeci, N.; Ogul, R.; Botvina, A. S.Theoretical calculations are performed to investigate the angular momentum and Coulomb effects on fragmentation and multifragmentation in peripheral heavy-ion collisions at Fermi energies. Inhomogeneous distributions of hot fragments in the freeze-out volume are taken into account by microcanonical Markov chain calculations within the statistical multifragmentation model. Including an angular momentum and a long-range Coulomb interaction between projectile and target residues leads to new features in the statistical fragmentation picture. In this case, one can obtain specific correlations of the sizes of emitted fragments with their velocities and an emission in the reaction plane. In addition, one may see a significant influence of these effects on isotope production both in the midrapidity and in the kinematic regions of the projectile/target. The relation of this approach to the simulations of such collisions with dynamical models is also discussed.Öğe Linear Energy Transfer In Water Phantom Within SHIELD-HIT Transport Code(AMER INST PHYSICS, 2017) Ergun, A.; Sobolevsky, N.; Botvina, A. S.; Buyukcizmeci, N.; Latysheva, L.; Ogul, R.The effect of irradiation in tissue is important in hadron therapy for the dose measurement and treatment planning. This biological effect is defined by an equivalent dose H which depends on the Linear Energy Transfer (LET). Usually, H can be expressed in terms of the absorbed dose D and the quality factor K of the radiation under consideration. In literature, various types of transport codes have been used for modeling and simulation of the interaction of the beams of protons and heavier ions with tissue-equivalent materials. In this presentation we used SHIELD-HIT code to simulate decomposition of the absorbed dose by LET in water for O-16 beams. A more detailed description of capabilities of the SHIELD-HIT code can be found in the literature.Öğe PREGNANCY OUTCOMES AFTER SINGLE EMBRYO TRANSFER LEGAL REGULATION INA UNIVERSITY HOSPITAL.(ELSEVIER SCIENCE INC, 2012) Ercan, C. M.; Kerimoglu, O. Secilmis; Sakinci, M.; Korkmaz, C.; Duru, N. K.; Ergun, A.[Abstract not Available]Öğe Production of ?-hypernuclei and evaluation of their binding energies via the double yield ratio(SPRINGER, 2019) Buyukcizmeci, N.; Botvina, A. S.; Ogul, R.; Ergun, A.; Bleicher, M.Relativistic collisions of ions, hadrons and leptons with nuclei can produce various hypernuclei by the capture of hyperons in nuclear residues. In many cases the disintegration of such hypernuclear systems can be described with statistical approaches suggesting that the fragment production is related to the binding energies of hypernuclei. We demonstrate how the hyperon binding energies can be effectively evaluated from the yields of different hyper-isotopes using the double ratio method. Its universality and the possibility to involve many different isotopes are the advantages of this method. The same procedure can also be applied for multi-strange nuclei, for which binding energies were very difficult to measure in previous hypernuclear experiments. Modifications caused by secondary de-excitation processes in hot hypernuclei are considered additionally.Öğe Production of exotic nuclei in heavy ion collisions at Fermi energies(IOP PUBLISHING LTD, 2017) Ogul, R.; Buyukcizmeci, N.; Ergun, A.Isotopic distributions of projectile fragmentation in peripheral heavy ion collisions of Kr-86 on Sn-124 are calculated within the statistical multifragmentation model. Obtained data are compared to the experimental cross section measurements. We show the enhancement in the production of neutron-rich isotopes close to the projectile, observed in the experiments. The universality of the limitation of the excitation energy induced in the projectile residues is also demonstrated.Öğe Production of exotic nuclei in projectile fragmentation at relativistic and Fermi energies(AMER INST PHYSICS, 2017) Ogul, R.; Ergun, A.; Buyukcizmeci, N.Isotopic distributions of projectile fragmentation in peripheral heavy ion collisions of Kr-86 on Sn-112 are calculated within the statistical multifragmentation model. Obtained data are compared to the experimental cross section measurements. We show the enhancement in the production of neutron-rich isotopes close to the projectile, observed in the experiments. Our results show the universality of the limitation of the excitation energy induced in the projectile residues.Öğe Production of neutron-rich exotic nuclei in projectile fragmentation at Fermi energies(SPRINGER SINGAPORE PTE LTD, 2017) Ogul, R.; Buyukcizmeci, N.; Ergun, A.; Botvina, A. S.Isotopic fragment yields of projectile fragmentation in peripheral collisions of Kr-86 on Sn-124,Sn-112 and the mean neutron-to-proton ratios of the fragments are calculated, theoretically, within the ensemble approach of statistical multifragmentation model. Obtained data are compared to the experimental cross-section measurements for the projectile-like fragmentation in the reaction of Kr-25 MeV/nucleon Kr-86+Sn-124,Sn-112 at Texas A&M University. We show the enhancement in the production of neutron rich isotopes close to the projectile as observed in the experiments. We also demonstrate the universality of the limitation of the excitation energy induced in the projectile residues.Öğe Statistical production and binding energy of hypernuclei(AMER PHYSICAL SOC, 2018) Buyukcizmeci, N.; Botvina, A. S.; Ergun, A.; Ogul, R.; Bleicher, M.High-energy nuclear reactions enable us to produce a large variety of hypernuclei through the capture of hyperons by nuclear residues. We explore the statistical disintegration of such hypernuclear systems and the connection of fragment production to the binding energies of hyperons. It has been demonstrated that the hyperon binding energies can be effectively evaluated from the yields of different isotopes of hypernuclei by using the double ratio method. The advantages of this procedure are its universality and the possibility to involve many different isotopes. This method can also be applied for multistrange nuclei, for which binding energies were very difficult to measure in previous hypernuclear experiments. Corrections caused by secondary deexcitation processes are also discussed.Öğe Theoretical study of projectile fragmentation in the Sn-112+Sn-112 and Sn-124+Sn-124 reactions at 1 GeV/nucleon(AMER PHYSICAL SOC, 2015) Imal, H.; Ergun, A.; Buyukcizmeci, N.; Ogul, R.; Botvina, A. S.; Trautmann, W.We analyze the production cross sections and isotopic distributions of projectile like residues in the reactions Sn-112 + Sn-112 and Sn-124 + Sn-124 at an incident beam energy of 1 GeV/nucleon measured with the fragment separator at the GSI laboratory. Calculations within the statistical multifragmentation model for an ensemble of excited sources were performed with ensemble parameters determined previously for similar reactions at 600 MeV/nucleon. The obtained good agreement with the experiment establishes the universal properties of the excited spectator systems produced during the dynamical stage of the reaction. It is furthermore confirmed that a significant reduction of the symmetry-energy term at the freeze-out stage of reduced density and high temperature is necessary to reproduce the experimental isotope distributions. A trend of decreasing symmetry energy for large neutron-rich fragments of low excitation energy is interpreted as a nuclear-structure effect.Öğe Theoretical Study of Projectile Fragmentations in Relativistic Heavy-Ion Reactions(E D P SCIENCES, 2015) Ogul, R.; Imal, H.; Ergun, A.; Buyukcizmeci, N.; Botvina, A. S.; Trautmann, W.We have investigated and interpreted the production cross sections and isotopic distributions of projectile-like residues in the reactions (124)sn + Sn-124 and (112)sn + Sn-112 and Sn at an incident beam energy of 1 GeV/nucleon measured with the FRS fragment separator at the GSI laboratory. For the interpretation of the data, calculations within the statistical multifragmentation model (SMM) for an ensemble of excited sources were performed with ensemble parameters. The possible modification of symmetry energy parameter, in the multifragmentation region at the low density and hot freeze-out environment, is studied. It is reconfirmed that a significant reduction of the symmetry energy term is found necessary to reproduce experimental results at these conditions. We have also found a decreasing trend of the symmetry energy for large neutron-rich fragments of low excitation energy which is interpreted as a nuclear-structure effect.
