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Your search keyword '"Y. Oktem"' showing total 9 results
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9 results on '"Y. Oktem"'

1. New test of modulated electron capture decay of hydrogen-like 142Pm ions: Precision measurement of purely exponential decay

Author

F.C. Ozturk, B. Akkus, D. Atanasov, H. Beyer, F. Bosch, D. Boutin, C. Brandau, P. Bühler, R.B. Cakirli, R.J. Chen, W.D. Chen, X.C. Chen, I. Dillmann, C. Dimopoulou, W. Enders, H.G. Essel, T. Faestermann, O. Forstner, B.S. Gao, H. Geissel, R. Gernhäuser, R.E. Grisenti, A. Gumberidze, S. Hagmann, T. Heftrich, M. Heil, M.O. Herdrich, P.-M. Hillenbrand, T. Izumikawa, P. Kienle, C. Klaushofer, C. Kleffner, C. Kozhuharov, R.K. Knöbel, O. Kovalenko, S. Kreim, T. Kühl, C. Lederer-Woods, M. Lestinsky, S.A. Litvinov, Yu.A. Litvinov, Z. Liu, X.W. Ma, L. Maier, B. Mei, H. Miura, I. Mukha, A. Najafi, D. Nagae, T. Nishimura, C. Nociforo, F. Nolden, T. Ohtsubo, Y. Oktem, S. Omika, A. Ozawa, N. Petridis, J. Piotrowski, R. Reifarth, J. Rossbach, R. Sánchez, M.S. Sanjari, C. Scheidenberger, R.S. Sidhu, H. Simon, U. Spillmann, M. Steck, Th. Stöhlker, B.H. Sun, L.A. Susam, F. Suzaki, T. Suzuki, S.Yu. Torilov, C. Trageser, M. Trassinelli, S. Trotsenko, X.L. Tu, P.M. Walker, M. Wang, G. Weber, H. Weick, N. Winckler, D.F.A. Winters, P.J. Woods, T. Yamaguchi, X.D. Xu, X.L. Yan, J.C. Yang, Y.J. Yuan, Y.H. Zhang, and X.H. Zhou

Subjects
Physics, QC1-999
Abstract

An experiment addressing electron capture (EC) decay of hydrogen-like Pm60+142 ions has been conducted at the experimental storage ring (ESR) at GSI. The decay appears to be purely exponential and no modulations were observed. Decay times for about 9000 individual EC decays have been measured by applying the single-ion decay spectroscopy method. Both visually and automatically analysed data can be described by a single exponential decay with decay constants of 0.0126(7)s−1 for automatic analysis and 0.0141(7)s−1 for manual analysis. If a modulation superimposed on the exponential decay curve is assumed, the best fit gives a modulation amplitude of merely 0.019(15), which is compatible with zero and by 4.9 standard deviations smaller than in the original observation which had an amplitude of 0.23(4). Keywords: Two body weak decay, Orbital electron capture, Single particle decay spectroscopy, Heavy ion storage ring

Published
2019
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2. Half-life determination of Tz = -1 and Tz = - $ {\frac{{1}}{{2}}}$ 1 2 proton-rich nuclei and the $ \beta$ β decay of 58Zn

Author

W. Gelletly, Y. Fujita, B. Blank, P. Ascher, L. Kucuk, Riccardo Raabe, F. de Oliveira Santos, L. Perrot, G. Susoy, T. Adachi, F. Molina, E. Ganioglu, J. C. Thomas, F. M. Marqués, J. Giovinazzo, A. Montaner-Pizá, Y. Oktem, Berta Rubio, P. C. Srivastava, S. E. A. Orrigo, Alejandro Algora, Hisanori Fujita, R. B. Cakirli, Atsushi Tamii, and S. Grévy

Subjects
Physics, Nuclear and High Energy Physics, Decay scheme, Isotopes of germanium, Proton, 010308 nuclear & particles physics, Isotopes of copper, Hadron, Analytical chemistry, Half-life, 7. Clean energy, 01 natural sciences, Beta decay, 0103 physical sciences, Atomic physics, 010306 general physics, Radioactive decay
Abstract

We have measured the $ \beta$ -decay half-lives of 16 neutron-deficient nuclei with $ T_{z} = -1/2$ and -1 , ranging from chromium to germanium. They were produced in an experiment carried out at GANIL and optimized for the production of$^{58}$Zn , for which in addition we present the decay scheme and absolute Fermi and Gamow-Teller transition strengths. Since all of these nuclei lie on the rp -process pathway, the $ T_{1/2}$ values are important ingredients for the rp -process reaction flow calculations and for models of X-ray bursters.

Published
2017
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3. Beta Decay Studies of Proton Rich Nuclei, an Important Ingredient for rp-Process Calculations

Author

B. Rubio, L. Kucuk, S. E. A. Orrigo, Y. Fujita, W. Gelletly, B. Blank, T. Adachi, P. Aguilera, J. Agramunt, A. Algora, P. Ascher, B. Bilgier, L. Cáceres, R. B. Cakirli, G. de France, F. de Oliveira Santos, H. Fujita, E. Ganioğlu, M. Gerbaux, J. Giovinazzo, S. Grévy, O. Kamalou, H. C. Kozer, T. Kurtukian-Nieto, M. Marqués, F. Molina, D. Nishimura, H. Oikawa, Y. Oktem, L. Perrot, L. Popescu, R. Raabe, A. M. Rogers, P. C. Srivastava, G. Susoy, C. Stodel, T. Suzuki, A. Tamii, J. C. Thomas, Instituto de Fisica Corpuscular ( IFIC ), Consejo Superior de Investigaciones Científicas [Spain] ( CSIC ) -Universitat de València ( UV ), Istanbul University, Research Center for Nuclear Physics ( RCNP ), Osaka University [Osaka], Department of Physics, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford, Centre d'Etudes Nucléaires de Bordeaux Gradignan ( CENBG ), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Istambul University, Grand Accélérateur National d'Ions Lourds ( GANIL ), Commissariat à l'énergie atomique et aux énergies alternatives ( CEA ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Laboratoire de physique corpusculaire de Caen ( LPCC ), Université de Caen Normandie ( UNICAEN ), Normandie Université ( NU ) -Normandie Université ( NU ) -Ecole Nationale Supérieure d'Ingénieurs de Caen ( ENSICAEN ), Normandie Université ( NU ) -Institut National de Physique Nucléaire et de Physique des Particules du CNRS ( IN2P3 ) -Centre National de la Recherche Scientifique ( CNRS ), Department of Physics, Tokyo University of Science, Noda, Chiba, Laboratoire de psychologie de Caen Normandie ( LPCN ), Normandie Université ( NU ) -Normandie Université ( NU ), Centre d'Etude de l'Energie Nucléaire ( SCK-CEN ), Argonne National Laboratory (ANL) - Physics Division (PHY), Instituto de Fisica Corpuscular (IFIC), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC)-Universitat de València (UV), Research Center for Nuclear Physics (RCNP), University of Surrey (UNIS), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1 (UB)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre d'Etude de l'Energie Nucléaire (SCK-CEN), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Proton, 010308 nuclear & particles physics, Chemistry, Radiochemistry, rp-process, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Beta decay, Nuclear physics, Ingredient, 0103 physical sciences, beta decay experiments, [ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, fragmentation facilities
Abstract

International audience; We have performed a series of beta-decay experiments at fragmentation facilities on T$_z$ = −1/2, T$_z$ = −1, and T$_z$ = −2 nuclei. Most of these nuclei lie on the rp-process path and therefore some of the quantities we have measured such as T$_{1/2}$ values are important ingredients in performing reaction flow calculations for light curve estimates and testing astrophysical models of X-ray bursters. At this conference we have presented the results of measurements of T$_{1/2}$ values for 25 nuclei and compared with previous values.

Published
2016
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6. Determination of indoor radon concentrations at the elementary schools of Fatih district in Istanbul

Author

A. Ertoprak, N. Hafizoglu, Y. Oktem, F. C. Ozturk, L. Sahin Yalcin, A. Kurt, Baki Akkuş, O. Aytan, and E. Bozkurt

Subjects
High concentration, Nuclear track, chemistry, Human exposure, Environmental chemistry, Solid-state, chemistry.chemical_element, Mineralogy, Radon, Uranium, Radioactive decay, Radioactive gas, respiratory tract diseases
Abstract

Radon is an odorless, tasteless, colorless noble radioactive gas which is produced within the radioactive decay chain of Uranium. The Radon forms in rocks, diffuses into soil and then escapes into atmosphere. When human exposure to high concentration of radon gas from inside, risk of developing lung cancer is increased. There are many methods to determine 222Rn concentration in the air. In this study, radon concentration of confined air spaces were measured by using LR-115 solid state nuclear track detectors. 509 LR-115 nuclear trace detectors were placed to 25 schools in Fatih District and they effective dose values were calculated. The results of measurements showed that the radon concentration varies between 40-395 Bq/m3. This results compared with Turkey’s limits (400 Bq/m3) are low, conversely higher compared with WHO’s limits (100 Bq/m3).

Published
2016
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7. AIP Conference Proceedings

Author

Aynur Kilicarslan, Ece Bal, Mustafa Dinc, Bahadir Salmankurt, Duman, Sıtkı, B Akkus, Y Oktem, Ls Yalcin, Rbc Mutlu, Gs Dogan, Bal, E, Dinc, M, Kilicarslan, A, Salmankurt, B, Duman, S, Sakarya Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü, Duman, Sıtkı, Toçoğlu, Ubeyd, Cevher, Özgür, Akbulut, Hatem, and Kol, Suat

Subjects
Condensed Matter::Materials Science, Physics, Physics::Atomic and Molecular Clusters, Physics::Atomic Physics
Abstract

We have employed the ab initio pseudopotential method, within a generalized gradient approximation of the density functional theory, a linear response approach, to determine atomic, elastic and lattice dynamical properties of the BaNbO3. The obtained structural and elastic parameter are in good agreement with previous experimental and theoretical results. The analysis of B/G ratio indicates that BaNbO3 is a ductile material. The calculated lattice dynamical properties compared with phonon spectrum of the similar structures.

Published
2016

8. Novel Moessbauer experiment in a rotating system and the extra-energy shift between emission and absorption lines

Author

Y. Oktem, Metin Arik, Tolga Yarman, L.A. Susam, Oleg V. Missevitch, Alexander Kholmetskii, and Baki Akkuş

Subjects
Physics, Mössbauer effect, Absorption spectroscopy, 010308 nuclear & particles physics, Frame (networking), FOS: Physical sciences, General Physics and Astronomy, 01 natural sciences, General Physics (physics.gen-ph), Theory of relativity, Physics - General Physics, 0103 physical sciences, Mössbauer spectroscopy, Energy shift, Atomic physics, 010306 general physics
Abstract

We present the results of a novel Mossbauer experiment in a rotating system, implemented recently in Istanbul University, which yields the coefficient k=0.69+/-0.02 within the frame of the expression for the relative energy shift between emission and absorption lines dE/E=ku2/c2. This result turned out to be in a quantitative agreement with an experiment achieved earlier on the subject matter (A.L. Kholmetskii et al. 2009 Phys. Scr. 79 065007), and once again strongly pointed to the inequality k>0.5, revealed originally in (A.L. Kholmetskii et al. 2008 Phys. Scr. 77, 035302 (2008)) via the re-analysis of Kundig experiment (W. Kundig. Phys. Rev. 129, 2371 (1963)). A possible explanation of the deviation of the coefficient k from the relativistic prediction k=0.5 is discussed., 21 pages, 8 figures, 3 tables

Published
2015

9. Tz=−1→0βdecays ofNi54,Fe50,Cr46, andTi42and comparison with mirror(He3,t)measurements

Author

D. Pauwels, J. L. Tain, J. J. Valiente-Dobón, Hiroshi Matsubara, P. Doornenbal, A. Algora, S. Pietri, S. Verma, A. I. Morales, D. Pérez-Loureiro, M. Gascon, F. Molina, W. Gelletly, J. Grȩbosz, H. J. Wollersheim, Robert Hoischen, Atsushi Tamii, Rajesh Kumar, Yoshitaka Fujita, Stanislav Tashenov, E. Ganioglu, P. Boutachkov, H. Schaffner, L. Amon Susam, Y. Oktem, A. Gadea, C. Domingo-Pardo, B. Rubio, S. J. Steer, W. Prokopowicz, Hans Geissel, Enrique Casarejos, I. Kojouharov, L. Caceres, J. Agramunt, J. Benlliure, Dirk Rudolph, R. B. Cakirli, N. Kurz, M. Górska, Zs. Podolyák, and J. Gerl

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Fragmentation (mass spectrometry), High resolution, Gamma spectroscopy, Sensitivity limit, Atomic physics, Beta decay, Excitation, Charge exchange, Fermi Gamma-ray Space Telescope
Abstract

We have studied the β decay of the Tz=−1, f7/2 shell nuclei Ni54, Fe50, Cr46, and Ti42 produced in fragmentation reactions. The proton separation energies in the daughter Tz=0 nuclei are relatively large (≈4–5 MeV) so studies of the γ rays are essential. The experiments were performed at GSI as part of the Stopped-beam campaign with the RISING setup consisting of 15 Euroball Cluster Ge detectors. From the newly obtained high precision β-decay half-lives, excitation energies, and β branching ratios, we were able to extract Fermi and Gamow-Teller transition strengths in these β decays. With these improved results it was possible to compare in detail the Gamow-Teller (GT) transition strengths observed in beta decay including a sensitivity limit with the strengths of the Tz=+1 to Tz=0 transitions derived from high resolution (3He,t) reactions on the mirror target nuclei at RCNP, Osaka. The accumulated B(GT) strength obtained from both experiments looks very similar although the charge exchange reaction provides information on a broader energy range. Using the “merged analysis” one can obtain a full picture of the B(GT) over the full Qβ range. Looking at the individual transitions some differences are observed, especially for the weak transitions. Their possible origins are discussed. (Less)

Published
2015
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