Yazar "Yazar, Harun Reşit" seçeneğine göre listele

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    Bazı erbiyum çekirdeklerinin elektromanyetik geçişlerinin kutupsal karışım oranlarının ve yapısal özelliklerinin incelenmesi
    (Kırıkkale Üniversitesi, 2003) Yazar, Harun Reşit; Uluer, İhsan
    ÖZET BAZI ERBİYUM ÇEKİRDEKLERİNİN ELEKTROMANYETİK GEÇİŞLERİNİN KUTUPSAL KARIŞIM ORANLARININ VE YAPISAL ÖZELLİKLERİNİN İNCELENMESİ YAZAR, Harun Reşit Kırıkkale Üniversitesi Fen Bilimleri Enstitüsü Fizik Anabilimdalı, Doktora Tezi Danışman : Prof. Dr. İhsan Uluer Ocak 2003, 145 sayfa Bu çalışmada, 150 < A < 190 deforme bölge ortasında bulunan Erbiyum izotoplarının geçişlerinin E2/M1 kutupsal karışım oranları, B(E2) geçiş olasılıkları, Q0 ve Q(2+) kuadropol momentleri, p0 ve p2 deformasyon parametreleri ve enerji düzeyleri; çift-çift Er çekirdeklerinin dinamik simetri yerleşimleri IBM faz üçgeninde belirlenip, bu çekirdeklerin parametre kümelerinin, 0(6)-SU(3) geçiş bölgesinde, SU(3) bölgesine yakın olduğu ve iyi bir rotasyonel duruma sahip oldukları gözönünde bulundurularak Etkileşen Bozon Model (IBM-II) yaklaşımı ile hesaplanmıştır. Çift-Tek izotoplarında ise bu parametrelerden bazıları Etkileşen Bozon Fermiyon Model (IBFM) kullanılarak elde edilmiştir.Tezin birinci bölümünde, Çift-çift ve Çift-tek Erbiyum izotoplarına ait önceki çalışmalar özetlenmiştir. İkinci bölümde çifttenim ve kuadropol kuvvetler, nükleer deformasyon açıklanarak bunlarla ilgili gerekli formülasyon sunulmuş olup, aynı bölümde Etkileşen Bozon modelinin ve Etkileşen Bozon Fermiyon Modelinin Hamiltonyenleri tanımlanarak; modelin grup yapısı, durumların sınıflandırılması ve simetri özellikleri incelenmiştir. Elektromanyetik geçiş özelliklerine, E2/M1 karışım oranlarına, B(E2) geçiş olasılıklarına, Q0 ve Q(2+) kuadropol momentlerine, p0 ve P2 nükleer deformasyon parametrelerine ait formüllasyon ortaya konulmuştur. Üçüncü bölümde, Çift-çift Erbiyum çekirdeklerinin uyarılmış düzeyleri ve bunların geçişlerinin kutupsal karışımları ayrıntılı olarak araştırılmış olup, bir önceki bölümde verilen ifadeler kullanılarak, farklı düzeyleri birleştiren geçişlere ait E2/M1 kutupsal karışım oranları, B(E2) değerleri, Q0 ve Q(2+) kuadropol momentleri ile p0 ve p2 deformasyon parametreleri hesaplanmış ve tablolar halinde verilmiştir. Ayrıca Çift-tek Erbiyum iztopları için enerji düzeyleri ve B(E2) geçiş olasılıkları da hesaplanmıştır. Dördüncü bölümde, tüm çekirdekler için hesaplanan veriler daha önce yapılmış deneysel ve teorik çalışmalarla birlikte tablolarda verilmiştir. Sonuçlar deneysel verilerle ve önceki teorik çalışmaların verileri ile karşılaştırılmış, elde edilen değerlerin, deneysel verilerle uyumlu oldukları; diğer teorik çalışmaların sonuçlarından deneylere daha yakın oldukları ve bazı değerler için henüz karşılaştırılabilecek deneysel ve teorik veri bulunmadığı görülmüştür. Anahtar Kelimeler : Etkileşen Bozon Modeli, Dinamik simetriler, Etkileşen Bozon Fermiyon Model u
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    A correspondence between IBA-1 and IBA-2 models and electromagnetic transitions in the decay of some erbium isotopes
    (Indian Acad Sciences, 2005) Yazar, Harun Reşit; Uluer, İhsan
    The interacting boson approximation IBA-1 model space, in which neutron and proton degrees of freedom are not distinguished, can be considered as a subspace of the IBA-2 model space. Using the microscopic background of the IBA-2 model, a correspondence can be established between IBA-1 and IBA-2 model space. Since the space of the IBA-1 model can be regarded as a subspace of the IBA-2 model there is a unique way to 'Project' the operators of the IBA-2 model onto those of IBA-1. This projection can be carried out using the F-spin formalism. In the IBA-2 model, the lowest states are indeed fully symmetric, and using the calculations with the help of this projection, we explore the energy levels and the electric quadrupole transition probabilities B(E2-, I-i -> I-f) and gamma-ray E2/M1 mixing ratios for selected transitions of Er-161,Er-161,Er-166,Er-168,Er-170. Owing to admixtures of non-fully-symmetric states in IBA-2, we renormalized the parameters (epsilon) and (kappa). This is the first time we show that this projection can be applied to some heavier isotopes and the results obtained for Er-162,Er-164,Er-166,Er-168,Er-170 isotopes are reasonably in good agreement with the previous experimental values.
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    The Investigation of Electromagnetic Transition Probabilities of Gadolinium Isotopes with the IBFM-1 Model
    (Physical Soc Republic China, 2010) Yazar, Harun Reşit; Uluer, İhsan; Ünaloğlu, Volkan; Yaşar, Sinan
    We investigate the energy levels and the electric quadrupole transition probabilities B(E2;I(i) -> I(f)) and gamma-ray E2/M1 mixing ratios for selected transitions of (152 similar to 156)Gd. The results are in reasonably good agreement with the previous experimental values. The negative spin states of the even-odd (153)Gd isotope were studied within the framework of the interacting boson-fermion model (IBFM-1). The single fermion is assumed to be in one of the lh(9/2), 3p(3/2), 2f(5/2), and 3p(1/2) single particle orbits. It was found that the calculated negative spin state energy spectra of the even-odd (153)Gd isotope agrees quite well with the experimental data. The observed B(E2) values were also calculated and compared with the experimental data.
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    Negative parity states and some electromagnetic transition properties of even-odd erbium isotopes
    (American Physical Soc, 2007) Yazar, Harun Reşit; Uluer, İhsan
    The negative parity states and some electromagnetic transition properties of even-odd erbium isotopes (Er-159,Er-161,Er-163,Er-165) were studied within the framework of the interacting boson-fermion model. The single fermion is assumed to be in one of the lh(9/2),3p(3/2),2f(5/2), and 3p(1/2) single-particle orbits. It was found that the calculated negative parity state energy spectra of the even-odd erbium isotopes agree quite well with the experimental data. The B(E2) values were also calculated and compared with the experimental data.
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    Negative-parity high-spin states of some even-odd erbium isotopes
    (Korean Physical Soc, 2006) Yazar, Harun Reşit
    The negative, high-spin states of the even-odd Er-159 similar to 163 isotopes were studied within the framework of the interacting boson-fermion model. The single fermion is assumed to be in a Ih(9/2), 3p(3/2), 2f(5/2) or 3p(1/2) single-particle orbit. The calculated negative high-spin state energy spectra of the odd Er isotope were found to agree quite well with the experimental data. The B(E2) values were also calculated and compared with the experimental data.
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    Positive parity low spin states of odd-mass tellurium isotopes
    (Academic Press Inc Elsevier Science, 2006) Yazar, Harun Reşit
    In this work, we analyse the positive parity of states of odd-mass nucleus within the framework of interacting boson fermion model. The result of an IBFM-1 multilevel calculation with the 1g(9/2), 2d(5/2), 2d(3/2), 3s(1/2) and one level, 1 h(11/2) with negative parity, single particle orbits is reported for the positive parity states of the odd mass nucleus Te121-125. Also, an IBM-1 calculation is presented for the low-lying states in the even-even Te124-126 core nucleus. The energy levels and B(E2) transition probabilities were calculated and compared with the experimental data. It was found that the calculated positive parity low spin state energy spectra of the odd-mass Te123-115 isotopes agree quite well with the experimental data. (c) 2006 Elsevier Inc. All rights reserved.
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    Some elastic properties and phase transitions in some alkali halides using interatomic potential model
    (Polish Acad Sciences Inst Physics, 2006) Yazar, Harun Reşit
    We have predicted the phase transition pressure in some alkali halides using an interatomic potential approach based on rigid ion model. This potential form represents the composite form of the inverse power dependence and exponential dependence of the repulsive energy on interionic distance. Some thermoelastic properties such as second order elastic constants have been calculated using the same potential. The phase transition pressures (28.69 and 2.4 GPa) obtained by us for two alkali halides (NaCl and KCl) are in closer agreement with their corresponding experimental data (29.0 and 2.0 CPa). This approach is promising with respect to prediction of the phase transition pressure of other alkali halides as well.
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    Some electromagnetic transition properties and mixing ratios of tellurium isotopes
    (Academic Journals, 2007) Yazar, Harun Reşit; Uluer, İhsan
    IBM-2 calculation is presented for the low-lying states in the even-even Te122-128 core nucleus. We developed the projection by using the F-spin formalism from the operator of IBA-2 model over the operator of IBA-1 model space. With the help of this projection IBA-2 Hamitonian parameters are obtained and we explore the energy levels and the electric quadrupole transition probabilities B (E2; I-i -> If) and gamma-ray E2/M1 mixing ratios for selected transitions. It was found that the calculated positive parity low spin state energy spectra of the even-even Te122-128 isotopes agree quite well with the experimental data.
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    Some Electromagnetic Transition Properties of Odd-A Europium Isotopes
    (Iop Publishing Ltd, 2010) Yazar, Harun Reşit; Uluer, İhsan; Ünaloğlu, Volkan; Yaşar, Sinan
    In this work, we analyze the positive parity of states of odd-A Eu isotopes within the framework of interacting boson fermion model (IBFM-1). The result of an IBFM-1 multilevel calculation with the 3s(1/2), 2d(3/2), 2d(5/2), and 1g(7/2) single particle orbits is reported for the positive parity states of the odd-A Eu isotopes. Also, an IBM-1 calculation is presented for the low-lying states in the even-even (152-154)Sm core nucleus. The energy levels and B(E2) transition probabilities are calculated and compared with the experimental data. It is found that the calculated positive parity low spin state energy spectra of the odd-A Eu isotopes agree quite well with the experimental data.
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    Using the microscopic background of the IBA-2 model electromagnetic transitions in the decay of some gadolinium isotopes
    (Korean Physical Soc, 2005) Yazar, Harun Reşit
    If the microscopic background of the IBA-2 model is used, a correspondence can be established between the IBA-1 and the IBA-2 model spaces. Since the space of the IBA-1 model can be regarded as a subspace of the IBA-2 model there is a unique way to "project" the operators of the IBA-2 model onto those of the IBA-1 model. This projection can be carried out by using the F-spin formalism. In the IBA-2 model, the lowest states are, indeed, fully symmetric, and in the calculations with the help of this projection, we explore the energy levels, the electric quadrupole transition probabilities B(E2;I-2 -> I-f), and the gamma-ray E2/M1 mixing ratios for selected transitions of Gd-152 similar to 156. For the first time, this projection is shown to be applicable to some heavier isotopes, and the results obtained for the Gd-152 similar to 156 isotopes are reasonably in good agreement with the previous experimental values.