Biyoinformatik ve Genetik Bölümü Koleksiyonu

Permanent URI for this collectionhttps://hdl.handle.net/20.500.12469/46

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Browsing Biyoinformatik ve Genetik Bölümü Koleksiyonu by browse.metadata.publisher "EDP Sciences"

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    Collectivity in Heavy Nuclei in the Shell Model Monte Carlo Approach
    (EDP Sciences, 2014) Özen, Cem; Alhassid, Yoram; Nakada, Hitoshi
    The microscopic description of collectivity in heavy nuclei in the framework of the configuration-interaction shell model has been a major challenge. The size of the model space required for the description of heavy nuclei prohibits the use of conventional diagonalization methods. We have overcome this difficulty by using the shell model Monte Carlo (SMMC) method which can treat model spaces that are many orders of magnitude larger than those that can be treated by conventional methods. We identify a thermal observable that can distinguish between vibrational and rotational collectivity and use it to describe the crossover from vibrational to rotational collectivity in families of even-even rare-earth isotopes. We calculate the state densities in these nuclei and find them to be in close agreement with experimental data. We also calculate the collective enhancement factors of the corresponding level densities and find that their decay with excitation energy is correlated with the pairing and shape phase transitions.
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    Level Densities of Heavy Nuclei in the Shell Model Monte Carlo Approach
    (EDP Sciences, 2016) Alhassid, Yoram; Bertsch, George F.; Gilbreth, Christopher N.; Nakada, Hitoshi; Özen, Cem
    Nuclear level densities are necessary input to the Hauser-Feshbach theory of compound nuclear reactions. However the microscopic calculation of level densities in the presence of correlations is a challenging many-body problem. The configuration-interaction shell model provides a suitable framework for the inclusion of correlations and shell effects but the large dimensionality of the many-particle model space has limited its application in heavy nuclei. The shell model Monte Carlo method enables calculations in spaces that are many orders of magnitude larger than spaces that can be treated by conventional diagonalization methods and has proven to be a powerful tool in the microscopic calculation of level densities. We discuss recent applications of the method in heavy nuclei.
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    Universality of Elasticity on Paam-Nipa Copolymer Gels
    (EDP Sciences, 2015) Evingür, Gülşen Akin; Pekcan, Önder
    Polyacrylamide (PAAm)-N-isopropylacrylamide (NIPA) copolymers were prepared via free radical crosslinking copolymerization with different molar of NIPA varying in the range between 0 and 2 M. The mechanical properties of swollen PAAm-NIPA copolymers were characterized by the compressive testing technique. It is understood that the compressive elastic modulus was found to increase by increasing NIPA contents keeping temperature constant at 30 degrees C. The critical exponent of elasticity y above the critical NIPA concentration is found to be as 0.74 which is consistent with the suggestions of percolation for superelastic percolation network (SEPN) and the critical theory for PAAm-NIPA copolymers.