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ŞAHİN, ÖZKAN

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ŞAHİN

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ÖZKAN

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2015 - 201922020 - 20211
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    Publication
    Excitation energy transfer model for Ne-CO2 and Ne-N2 mixtures
    (IOP, 2021-03-01) Şahin, Özkan; ŞAHİN, ÖZKAN; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü; I-9715-2017
    The excited states of neon are capable of ionizing the CO2 and N-2 molecules through Penning energy transfer mechanisms. Probability of such additional ionizations can be calculated from the measured gas gain fits. In the present work, Penning ionization processes for Ne-CO2 and Ne-N-2 mixtures have been investigated with a newly developed model. The decreases in the transfer rates observed at high molecular gas concentrations indicate the existence of a remarkably interesting transfer mechanism for the excited neon atoms.
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    Publication
    Intermolecular magnetic spin-spin interactions in solution state at 1.53 mT
    (Taylor, 2015-01-01) Yıldız, Fevkani; Şahin, Özkan; Peksöz, Ahmet; Yıldız, Fevkani; ŞAHİN, ÖZKAN; PEKSÖZ, AHMET; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü; KQV-0698-2024; AAH-6445-2021; AAG-9772-2021; I-9715-2017
    Overhauser dynamic nuclear polarization (DNP) technique can provide a dramatic increase in the signal obtained from nuclear magnetic resonance experiments owing to the magnetic spin-spin interactions between H-1 nuclei of the solvent and electrons delocalized on the asphaltene in crude petroleum or asphalt. Studies on H-1 Overhauser DNP enhancements at 1.53 mT are reported for benzene solvent medium with three different radical sources: Iran crude petroleum, MC30 liquid asphalt, and MC800 liquid asphalt for a range of radical concentrations. The results show that protons of benzene are good detectors for dipolar coupling.
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    Accurate γ and mev-electron track reconstruction with an ultra-low diffusion xenon/tma tpc at 10 atm
    (Elsevier, 2015-12-21) Gonzalez-Diaz, Diego; Alvarez, V.; Borges, F. I. G.; Camargo, M.; Carcel, S.; Cebrian, S.; Cervera, A.; Conde, C. A. N.; Dafni, T.; Diaz, J.; Esteve, R.; Fernandes, L. M. P.; Ferrari, P.; Ferreira, A. L.; Freitas, E. D. C.; Gehmani, V. M.; Goldschmidt, A.; Gomez-Cadenas, J. J.; Gutierrez, R. M.; Hauptman, J.; Hernando Morata, J. A.; Herrera, D. C.; Irastorza, I. G.; Labarga, L.; Laing, A.; Liubarsky, I.; Lopez-March, N.; Lorca, D.; Losada, M.; Luzon, G.; Mari, A.; Martin-Albo, J.; Martinez-Lema, G.; Martinez, A.; Miller, T.; Monrabal, F.; Monserrate, M.; Monteiro, C. M. B.; Mora, F. J.; Moutinho, L. M.; Munoz Vidal, J.; Nebot-Guinot, M.; Nygren, D.; Oliveira, C. A. B.; Perez, J.; Perez Aparicio, J. L.; Querol, M.; Renner, J.; Ripoll, L.; Rodriguez, J.; Santos, F. P.; dos Santos, J. M. F.; Serra, L.; Shuman, D.; Simon, A.; Sofka, C.; Sorel, M.; Toledo, J. F.; Torrent, J.; Tsamalaidze, Z.; Veloso, J. F. C. A.; Villar, J. A.; Webb, R.; White, J. T.; Yahlali, N.; Azevedo, C.; Aznarab, F.; Calvet, D.; Castel, J.; Ferrer-Ribas, E.; Garcia, J. A.; Giomataris, I.; Gomez, H.; Iguaz, F. J.; Lagraba, A.; Le Coguie, A.; Mols, J. P.; Rodriguez, A.; Ruiz-Choliz, E.; Segui, L.; Tomas, A.; Veenhof, R.; Şahin, Özkan; ŞAHİN, ÖZKAN; Bursa Uludağ Üniversitesi/Fen Edebiyat Fakültesi; I-9715-2017
    We report the performance of a 10 atm Xenon/trimethylamine time projection chamber (TPC) for the detection of X-rays (30 keV) and gamma-rays (0.511-1.275 MeV) in conjunction with the accurate tracking of the associated electrons. When operated at such a high pressure and in similar to 1%-admixtures, trimethylamine (TMA) endows Xenon with an extremely low electron diffusion (1.3 +/- 0.13 mm-sigma (longitudinal), 0.95 +/- 0.20 mm-sigma (transverse) along 1 m drift) besides forming a convenient Penning-Fluorescent' mixture. The TPC, that houses 1.1 kg of gas in its fiducial volume, operated continuously for 100 live-days in charge amplification mode. The readout was performed through the recently introduced microbulk Micromegas technology and the AFTER chip, providing a 3D voxelization of 8 mm x 8 mm x 1.2 mm for approximately 10 cm/MeV-long electron tracks. Resolution in energy (epsilon) at full width half maximum (R) inside the fiducial volume ranged from R = 14.6% (30 keV) to R = 4.6% (1.275 MeV).This work was developed as part of the R&D program of the NEXT collaboration for future detector upgrades in the search of the neutrino-less double beta decay (beta beta 0 nu) in Xe-136, specifically those based on novel gas mixtures. Therefore we ultimately focus on the calorimetric and topological properties of the reconstructed MeV-electron tracks. In particular, the obtained energy resolution has been decomposed in its various contributions and improvements towards achieving the R =1.4%root MeV/epsilon levels obtained in small sensors are discussed.