Yazar "Buyukcizmeci N." seçeneğine göre listele

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    Formation of hypernuclei in relativistic ion, hadron and lepton collisions
    (American Institute of Physics Inc., 2019) Botvina A.; Bleicher M.; Buyukcizmeci N.
    The study of hypernuclei in violent relativistic collisions of ion and other particle with nuclei open new opportunities for nuclear/particle physics and astrophysics. We review the main processes leading to the production of hypernuclei in these reactions: There are the disintegration of large excited hyper-residues (target- and projectile-like remnants with captured hyperons) and the coalescence of hyperons with other baryons into light clusters. We use the transport, coalescence and statistical models to describe the whole process, and demonstrate the advantages of these reactions. A broad distribution of predicted hypernuclei in masses and isospin allows for investigating properties of the exotic hypernuclei and hypermatter. We point at the abundant production of multi-strange nuclei and moderately excited hypernuclear matter. The realistic estimates of hypernuclei yields in various collisions are presented. Many processes well known in normal reactions, such as evaporation, fission, multifragmentation, and Fermi-break-up are generalized and calculated for the case of excited hypermatter. We suggest also a novel method for investigation of the hyperon binding energies directly from experimental measurements of the hypernuclei yields. © 2019 Author(s).
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    Neutrons from multifragmentation reactions
    (Sissa Medialab Srl, 2011) Trautmann W.; Botvina A.S.; Brzychczyk J.; Buyukcizmeci N.; Mishustin I.N.; Paw?owski P.; ALADIN2000 COLLABORATION
    The neutron emission in the fragmentation of stable and radioactive Sn and La projectiles of 600 MeV per nucleon has been studied with the Large Neutron Detector LAND coupled to the ALADIN forward spectrometer at SIS. A cluster-recognition algorithm is used to identify individual particles within the hit distributions registered with LAND. The obtainedmomentumdistributions are extrapolated over the full phase space occupied by the neutrons from the projectile-spectator source. The mean multiplicities of spectator neutrons reach values of up to 12 and depend strongly on the isotopic composition of the projectile. An effective source temperature of T ? 3-4 MeV is deduced from the transverse momentum distributions. For the interpretation of the data, calculations with the Statistical Multifragmentation Model for a properly chosen ensemble of excited sources were performed. The possible modification of the liquid-drop parameters of the fragment description in the hot environment is studied, and a significant reduction of the symmetry-term coefficient is found necessary to simultaneously reproduce the neutron multiplicities and the mean neutron-to-proton ratios /Z of Z ? 10 fragments. Because of the similarity of the freeze-out conditions with those encountered in supernova scenarios, this is of astrophysical interest. © Copyright owned by the author(s) under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike Licence.
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    Projectile fragmentation in nuclear reactions at fermi energies
    (Jagellonian University, 2015) Ogul R.; Buyukcizmeci N.; Ergun A.; Imal H.; Botvina A.S.
    In this short communication, we have interpreted TAMU data for peripheral collisions of 40Ca + sSn and 48Ca + 112;124Sn at E=A = 32 MeV with different isospin degrees of freedom which were studied at the Cyclotron Institute of Texas A and M University (TAMU) using the K500 Superconducting Cyclotron. Isotopic yields of light intermediate mass fragments Z ? 8, (here, we only consider carbon isotopes) were studied on the basis of the statistical multifragmentation model. It is seen from the fractional yields that the neutron-rich systems preferentially populate the most neutron-rich isotopes. It is confirmed that symmetry energy is the main parameter governing the isotopic composition of the fraction yields.