• CVD Yöntemi ile Karbon Katkılanmış Bor Kullanılarak Üretilen MgB2’nin Mikrosertlik Özelliklerinin İncelenmesi 

  Kaya, Naki; Çavdar, Şükrü; Koralay, Haluk (Gazi Üniversitesi , Fen Bilimleri Enstitüsü, 2020)

  Bu çalışmada ülkemiz için stratejik bir öneme sahip olan bor elementi ile elde edilen ve teknolojikaçıdan çok geniş ölçekli bir kullanım alanına sahip olan magnezyum diborür, kimyasal buharbiriktirme (CVD) yöntemi ile elde ...

• CVD Yöntemi ile Karbon Katkılanmış Bor Kullanılarak Üretilen MgB2 Süperiletkeninin Yapısal ve Manyetiksel Özelliklerine Sıcaklık Etkisinin İncelenmesi 

  Kaya, Naki; Çavdar, Şükrü; Koralay, Haluk (Gazi Üniversitesi , Fen Bilimleri Enstitüsü, 2021)

  Bu çalışmada, MgB2’nin süperiletkenlik özellikleri üzerinde iyileştirici bir rol oynadığı bilinenkarbon, CVD (kimyasal buhar biriktirme) yöntemi ile MgB2’ye katkılanarak sinterlemesıcaklığının değişimine bağlı olarak MgB2’de ...

• Hazır MgB2 Tozları ile Mg ve B Tozlarının Karışımı Yolu ile Elde Edilen MgB2 Numunelerinin Kristalografik ve Mikrosertlik Özellikleri Üzerinde Sinterleme Sayısının Etkisi 

  Kaya, Naki; Safran, Serap (Gazi Üniversitesi Fen Bilimleri Dergisi Part C: Tasarım ve Teknoloji, 2022)

  Bu çalışmada hazır olarak satın alınan MgB2 tozları ile elementel Mg ve B tozlarının karışımı yolu ile elde edilen MgB2 numunelerinin ısıl işlem sayısının kristalografik ve mikrosertlik özellikleri üzerinde nasıl bir değişim ...

• Evaluation of Superconducting Features and Gap Coefficients for Electron-Phonon Couplings Properties of Mgb2 with Multi-Walled Carbon Nanotube Addition 

  Kaya, Naki; Çavdar, S.; Öztürk, Ö.; Yıldırım, G.; Koralay, H. (Springer, 2022)

  In this study, the samples are prepared by solid state reaction method at different weight ratios (0-4%). The characterization of materials produced is conducted with the aid of powder X-ray diffraction (XRD), temperatur ...

• Investigation of The Effect of Temperature on The Structural and Magnetic Properties of MgB2 Superconductor Produced Using Boron Doped with Carbon by CVD Method 

  Kaya, Naki; Çavdar, Şükrü; Koralay, Haluk (Gazi Üniversitesi, 2021)

  Carbon, which is known to play a improvement role on the superconductivity properties of MgB2, was doped into MgB2 by CVD (chemical vapor deposition) method, and the change of structural and magnetic properties observed ...

• Investigation of Microhardness Properties of the Multi-Walled Carbon Nanotube Additive Mgb2 Structure By Using The Vickers Method 

  Kaya, Naki; Cavdar, Sukru; Ozturk, Ozgur; Ada, Hakan; Koralay, Haluk (Elsevier, 2021)

  In this study, the effect of multi-walled carbon nanotube doping to MgB2 compound on microhardness properties of MgB2 was investigated by using solid-state reaction method. The amount of multi-walled carbon nanotubes was ...

• Search for the weak decays J/? ? D(?)- s e+?e + c.c 

  The BESIII collaboration; Kolcu, Onur Buğra (American Physical Society, 2014)

  Using a sample of 2.25 × 108 J/? events collected with the BESIII detector at the BEPCII collider, we search for the J/? semileptonic weak decay J/? ? D-s e+?e+ c.c. with a much higher sensitivity than previous searches. ...

• Observation of e+e- ? ?+?- hc and a Neutral Charmoniumlike Structure Zc(4020)0 

  The BESIII collaboration; Kolcu, Onur Buğra (American Physical Society, 2014)

  Using data collected with the BESIII detector operating at the Beijing Electron Positron Collider at center-of-mass energies of ?s = 4.23, 4.26, and 4.36 GeV, we observe e+e- ? ?+?-hc for the first time. The Born cross ...

• Observation and spin-parity determination of the X(1835) in J/? ? ?K0SK0S? 

  The BESIII collaboration; Kolcu, Onur Buğra (American Physical Society, 2015)

  We report an observation of the process J/? ? ?X(1835) ? ?K0SK0S? at low K0SK0S mass with a statistical significance larger than 12.9? using a data sample of 1.31 × 109 J/? events collected with the BESIII detector. In ...

• Search for the isospin violating decay Y(4260)-> J/psi eta pi(0) 

  The BESIII collaboration; Kolcu, Onur Buğra (American Physical Society, 2015)

  Using data samples collected at center-of-mass energies of ?s= 4.009, 4.226, 4.257, 4.358, 4.416, and 4.599 GeV with the BESIII detector operating at the BEPCII storage ring, we search for the isospin violating decay Y(4260) ...

• Search for the y (4140) via e+e- ???J /? at s =4.23, 4.26 and 4.36 GeV 

  The BESIII collaboration; Kolcu, Onur Buğra (American Physical Society, 2015)

  Using data samples collected at center-of-mass energies s=4.23, 4.26, and 4.36 GeV with the BESIII detector operating at the BEPCII storage ring, we search for the production of the charmoniumlike state Y(4140) through a ...

• Observation of Z(c)(3900)(0) in e(+)e(-) -> pi(0)pi(0) J/Psi 

  The BESIII collaboration; Kolcu, Onur Buğra (American Physical Society, 2015)

  Using a data sample collected with the BESIII detector operating at the BEPCII storage ring, we observe a new neutral state Zc(39000)0 with a significance of 10.4?. The mass and width are measured to be 3894.8 ± 2.3 ± 3.2 ...

• Amplitude analysis of the ? 0 ? 0 system produced in radiative J=? decays 

  The BESIII collaboration; Kolcu, Onur Buğra (American Physical Society, 2015)

  An amplitude analysis of the ? 0 ? 0 system produced in radiative J=? decays is presented. In particular, a piecewise function that describes the dynamics of the ? 0 ? 0 system is determined as a function ofM? 0 ? 0 from ...

• Study of e+e- ???cJ at center of mass energies from 4.21 to 4.42 GeV 

  The BESIII collaboration; Kolcu, Onur Buğra (American Physical Society, 2015)

  Based on data samples collected with the BESIII detector at the BEPCII collider at nine center of mass energies from 4.21 to 4.42 GeV, we search for the production of e+e-???cJ (J=0, 1, 2). The process e+e-???c0 is observed ...

• Study of J/psi -> eta phi pi(+)pi(-) at BESIII 

  The BESIII collaboration; Kolcu, Onur Buğra (American Physical Society, 2015)

  Based on a sample of 2.25×108J/? events taken with the BESIII detector at the BEPCII collider, we present the results of a study of the decay J/?????+?-. The Y(2175) resonance is observed in the invariant mass spectrum of ...

• Precision measurement of the D?0 decay branching fractions 

  The BESIII collaboration; Kolcu, Onur Buğra (American Physical Society, 2015)

  Using 482 pb-1 of data taken at s=4.009 GeV, we measure the branching fractions of the decays of D?0 into D0?0 and D0? to be B(D?0?D0?0)=(65.5±0.8±0.5)% and B(D?0?D0?)=(34.5±0.8±0.5)%, respectively, by assuming that the ...

• Measurement of yCP in D0-D0 oscillation using quantum correlations in e+e- ? D0D0 at ?s = 3.773 GeV 

  The BESIII collaboration; Kolcu, Onur Buğra (Elsevier B.V., 2015)

  We report a measurement of the parameter yCP in D0-D-0 oscillations performed by taking advantage of quantum coherence between pairs of D0D-0 mesons produced in e+e- annihilations near threshold. In this work, doubly-tagged ...

• Measurements of ? (3686) ?k- ? ? ¯ ++ c. c. and ? (3686) ??K- ? ? ¯ ++ c. c. 

  The BESIII collaboration; Kolcu, Onur Buğra (American Physical Society, 2015)

  Using a sample of 1.06×108?(3686) events produced in e+e- collisions at s=3.686 GeV and collected with the BESIII detector at the BEPCII collider, we present studies of the decays ?(3686)?K-??¯++c.c. and ?(3686)??K-??¯++c.c.. ...

• Measurement of B(psi(3770) -> gamma chi(c1)) and search for psi(3770) -> gamma chi(c2) 

  The BESIII collaboration; Kolcu, Onur Buğra (American Physical Society, 2015)

  We report a measurement of the branching fraction for ?(3770)???c1 and search for the transition ?(3770)???c2 based on 2.92 fb-1 of e+e- data accumulated at s=3.773 GeV with the BESIII detector at the BEPCII collider. We ...

• Measurement of the proton form factor by studying e+e- ?p p ¯ 

  The BESIII collaboration; Kolcu, Onur Buğra (American Physical Society, 2015)

  Using data samples collected with the BESIII detector at the BEPCII collider, we measure the Born cross section of e+e-?pp¯ at 12 center-of-mass energies from 2232.4 to 3671.0 MeV. The corresponding effective electromagnetic ...

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