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9 results on '"Koester U."'

1. Fluorinated nanodiamonds as unique neutron reflector

Author

Dubois, M., Nesvizhevsky, V., Jentschel, M., Koester, U., Batisse, N., Frezet, L., Bosak, A., Gines, L., Williams, O., Institut de Chimie de Clermont-Ferrand (ICCF), SIGMA Clermont (SIGMA Clermont)-Institut de Chimie du CNRS (INC)-Université Clermont Auvergne [2017-2020] (UCA [2017-2020])-Centre National de la Recherche Scientifique (CNRS), and Bonnefoy, Stéphanie

Subjects
[CHIM] Chemical Sciences, [CHIM]Chemical Sciences, ComputingMilieux_MISCELLANEOUS
Abstract

International audience

Published
2019

2. Lifetimes of the 2$^+_1$ and the 4$^+_1$ States of $^{148}$Ce and its B$_{4/2}$ Ratio from EXILL&FATIMA Experiment

Author

Koseoglou, P., Werner, V., Pietralla, N., Ilieva, S., Bernards, C., Blanc, A., Bruce, A.M., Cakirli, R.B., Cooper, N., de France, G., Jentschel, M., Jolie, J., Koester, U., Kröll, T., Mutti, P., Patel, Z., Paziy, V., Podolyak, Zs., Regan, P.H., Regis, J.M., Roberts, O.J., Saed-Samii, N., Simpson, G.S., Soldner, T., Ur, C.A., Urban, W., Wilmsen, D., Wilson, E., Institut Laue-Langevin (ILL), ILL, Grand Accélérateur National d'Ions Lourds (GANIL), 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Centre National de la Recherche Scientifique (CNRS), Lion, Michel, 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), and Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; The even-even N=90 isotones with Z=60-66, present an interesting phase transition. This phasetransition in nuclei is characterized by a sudden change of the shape of the nucleus [1]. 148Ce lies onthe downboundaries of the phase transition region and therefore further elucidate the underlyingmechanisms that lend the shape phase transition behavior. 235U and 241Pu fission fragments were measured by a mixed spectrometer consisting of highresolution Ge and fast LaBr3(Ce)-scintillator detectors at the high-flux reactor of the ILL. Prompt γ-ray cascades from the nuclei of interest are selected via Ge-Ge-LaBr3-LaBr3 coincidences. The goodenergy resolution of the Ge allows precise gates to be set, selecting the cascade, hence, the nucleusof interest. The excellent timing performance of the LaBr3 detectors in combination with theGeneral Centroid Difference method [2] allows the measurement of lifetimes in the ps range inpreparation for the FATIMA experiment at FAIR. The first results on neutron-rich 148Ce arepresented.

Published
2016

3. Theoretical approach based on Monte-Carlo simulations to predict the cell survival following BNCT

Author

Delorme, R., Miquel, L., Dauvergne, D., Beuve, M., Monini, C., Testa, E., Koester, U., Aspord, C., Chaperot, L., Plumas, J., Balosso, J., Elleaume, H., Giraud, J., Ghetta, V., Guillaudin, O., Muraz, J.F., Rubiolo, P., Sauzet, N., Santos, D., Vernay, Emmanuelle, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut Laue-Langevin (ILL), ILL, Institute for Advanced Biosciences / Institut pour l'Avancée des Biosciences (Grenoble) (IAB), Centre Hospitalier Universitaire [Grenoble] (CHU)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Etablissement français du sang - Auvergne-Rhône-Alpes (EFS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])-Centre National de la Recherche Scientifique (CNRS), and Centre Hospitalier Universitaire [Grenoble] (CHU)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Etablissement français du sang - Auvergne-Rhône-Alpes (EFS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019])

Subjects
[PHYS.PHYS.PHYS-MED-PH] Physics [physics]/Physics [physics]/Medical Physics [physics.med-ph], [PHYS.PHYS.PHYS-MED-PH]Physics [physics]/Physics [physics]/Medical Physics [physics.med-ph]
Abstract

International audience; We present here a very preliminary work on BNCT Dosimetry. The approach is as follows:A full Monte Carlo calculation is used to separate all dose components and determine the corresponding physical dose fractions with a realistic clinical model.These dose fractions are then used as mixed fields to predict cell-survivals and RBE values for a specific cell-line, thanks to the radiobiological model NanOxTM.

Published
2016

4. Accelerator Based Neutron Capture Therapies in France

Author

Santos, D., Dauvergne, D., Delorme, R., Ghetta, V., Giraud, J., Guillaudin, O., Miquel, L., Muraz, J. F., Pablo Rubiolo, Sagnier, A., Sauzet, N., Beuve, M., Monini, C., Testa, E., Koester, U., Aspord, C., Chaperot, L., Plumas, J., Balosso, J., Elleaume, H., Rayet, Béatrice, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut Laue-Langevin (ILL), ILL, Institute for Advanced Biosciences / Institut pour l'Avancée des Biosciences (Grenoble) (IAB), Centre Hospitalier Universitaire [Grenoble] (CHU)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Etablissement français du sang - Auvergne-Rhône-Alpes (EFS)-Centre National de la Recherche Scientifique (CNRS)-Université Grenoble Alpes [2016-2019] (UGA [2016-2019]), Rayonnement Synchrotron et Recherche Medicale (RSRM), and Université Joseph Fourier - Grenoble 1 (UJF)-European Synchrotron Radiation Facility (ESRF)-Institut National de la Santé et de la Recherche Médicale (INSERM)

Subjects
[PHYS.PHYS.PHYS-MED-PH] Physics [physics]/Physics [physics]/Medical Physics [physics.med-ph], [PHYS.PHYS.PHYS-INS-DET] Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], [PHYS.PHYS.PHYS-MED-PH]Physics [physics]/Physics [physics]/Medical Physics [physics.med-ph], [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]
Abstract

Exposé oral; International audience; In France, we have started in 2015, an interdisciplinary work on AB-NCT profiting of a synergy among different research institutes: Laboratoire de Physique Subatomique et de Cosmologie de Grenoble (LPSC), the Institut Laue-Langevin (ILL) and the Institut de Physique Nucléaire de Lyon (IPNL) coming from nuclear physics, with neutron and gamma detection expertise and their medical applications, the Grenoble University Hospital (CHU) and the Institut Albert Bonniot (IAB) coming from radiobiology, biological research, and clinical experience.The main purpose of this collaboration is to enable the production of epithermal neutron fields in a hospital environment by contributing to the development of compact (accelerator based) neutron sources. In parallel, we plan to improve the understanding of the biophysical determinants of the effectiveness of treatment performing radiobiology studies by cell irradiations at the ILL and simulation modelling (see R. Delorme et al. contribution). In addition, a particular effort will be performed to understand and optimize the deleterious effects of AB-NCT on tumor cells and to characterize the potential induction of subsequent anti-tumor immune responses.Since the beginning of the project, the major realizations have been:- a rotating Be target design able to cope with 30 kW (20 mA of deuteron beam at 1.5 MeV) and on the thermal tests with an electron beam using the COMICAC facility at LPSC,- the design of a Beam Shaping Assembly (BSA) adapted to this rotating target,- the development of a neutron directional detection system to characterize and control the neutron fields before and during the NCT irradiation.We will present the fast neutron directional detector (MIMAC-FastN) able to characterize the fluence and the angular distribution of the neutron fields produced. Using a thin foil of natB inside the active volume, we can calibrate the detector with the same reaction that will be produced at the tumor level. We will show results of measurements of fast neutrons performed recently. We will present the design and thermal simulations of the original rotating target, with in situ regeneration capability, and the BSA adapted to it.All these contributions will be placed in the context of a national project profiting of know-how on high current ion sources and RFQ availabilities.

Published
2016

5. Verification of the thermodynamic model in nuclear fission: the new spectrometer FIPPS

Author

Faust, H., Koester, U., Abdelaziz Chebboubi, Blanc, A., Kessedjian, G., Sage, C., Materna, T., Panebianco, S., Institut Laue-Langevin (ILL), ILL, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), and Vernay, Emmanuelle

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
2013

6. Identification of the slow E3 transition 136mCs -> 136Cs with conversion electrons

Author

Wimmer, K., Koester, U., Hoff, P., Kroell, Th., Kruecken, R., Lutter, R., Mach, H., Morgan, Th., Sarkar, S., Sarkar, M. Saha, Schwerdtfeger, W., Srivastava, P.C., Thirolf, P. G., van Isacker, P., Institut Laue-Langevin (ILL), ILL, Grand Accélérateur National d'Ions Lourds (GANIL), 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 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)

Subjects
Nuclear Theory, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Physics::Instrumentation and Detectors, Physics::Atomic and Molecular Clusters, Physics::Chemical Physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, 23.20.Nx, 23.35.+g, 21.10.Hw, 23.20.Lv
Abstract

We performed at ISOLDE the spectroscopy of the decay of the 8- isomer in 136Cs by and conversion-electron detection. For the first time the excitation energy of the isomer and the multipolarity of its decay have been measured. The half-life of the isomeric state was remeasured to T1/2 = 17.5(2) s. This isomer decays via a very slow 518 keV E3 transition to the ground state. In addition to this, a much weaker decay branch via a 413 keV M4 and a subsequent 105 keV E2 transition has been found. Thus we have found a new level at 105 keV with spin 4+ between the isomeric and the ground state. The results are discussed in comparison to shell model calculations., Comment: Phys. Rev. C accepted for publication

Published
2011

7. Precision measurement of the decay rate of $^7Be$ in host materials

Author

Nir-El, Y., Haquin, G., Yungreiss, Z., Hass, M., Goldring, G., Chamoli, S. K., Singh, B. S. Nara, Lakshmi, S., Koester, U., Champault, N., Dorsival, A., Georgiev, G., Fedoseyev, V. N., Marsh, B. A., Schumann, D., Heidenreich, G., Teichmann, S., Institut Laue-Langevin (ILL), ILL, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), and Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)

Subjects
25.40.Lw, 21.10.Tg, 26.20.+f, 27.20.+n, proton-nucleus reactions, nuclei with mass number 6 to 19, heavy ion fusion reactions, FOS: Physical sciences, Nuclear Physics - Experiment, tritons, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, alpha particle-nucleus reactions, nuclear energy level lifetimes
Abstract

A controlled and precise determination of the cross-sections of the fusion reactions 7Be(p,gamma)8B and 3He(4He,gamma)7Be, which play an important role in determining the solar neutrino flux, necessitates the knowledge of a precise value of the electron-capture half-life of 7Be. This half-life may depend on the material hosting the 7Be atoms via small modifications of the electron density around the 7Be nucleus. In this brief communication we report on the measurement of 7Be implanted in four materials: copper, aluminum, sapphire and PVC. The four results are consistent with a null host dependence within two standard deviations and their weighted average of 53.236(39)d agrees very well with the adopted value in the literature, 53.22(6)d. The present results may exhibit a slight (0.22%) increase of the half-life at room temperature for metals compared to insulators that requires further studies., 4 pages, 4 figures. Accepted for publication in Phys. Rev. C (Rapid Communications)

Published
2007

8. First observation of the $\beta$ decay of neutron-rich $^{218}$Bi by the pulsed-release technique and resonant laser ionization

Author

de Witte, H., Andreyev, A.N., Borzov, I.N., Caurier, E., Cederkaell, J., de Smet, A., Eeckhaudt, S., Fedorov, D.V., Fedosseev, V.N., Franchoo, S., Gorska, M., Grawe, H., Huber, G., Huyse, M., Janas, Z., Koester, U., Kurcewicz, W., Kurpeta, J., Plochocki, A., van de Vel, K., van Duppen, P., Weissman, L., Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), and Heyd, Yvette

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Physics - Experiment, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

The neutron-rich isotope /sup 218/Bi has been produced in proton- induced spallation of a uranium carbide target at the ISOLDE facility at CERN, extracted from the ion source by the pulsed-release technique and resonant laser ionization, and its beta decay is studied for the first time. A half-life of 33(1)s was measured and is discussed in the self-consistent continuum-quasi particle-random- phase approximation framework that includes Gamow-Teller and first- forbidden transitions. A level scheme was constructed for /sup 218 /Po, and a deexcitation pattern of stretched E2 transitions 8/sup +/ to 6/sup +/ to 4/sup +/ to 2/sup +/ to 0/sup +/ to the ground state is suggested. Shell-model calculations based on the Kuo-Herling interaction reproduce the experimental results satisfactorily. (28 refs).

Published
2004

9. Experiments with accelerated fission fragments

Author

Egidy, T. Von, Koester, U., Steichele, E., Habs, D., Kester, O., Ott, J., Thirolf, P., Belmont, J.L., Bruandet, J.F., Chauvin, J., De Conto, J.M., Fruneau, M., Liatard, E., Nifenecker, H., Pinston, J.A., Vignon, B., Astruc, J.M., Bauer, E., Faust, H., Gross, M., Leconte, P., Aleklett, K., Fogelberg, B., Mach, H., Hanappe, F., Béraud, R., Emsallem, A., bibliotheque, LPSC, Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Published
1997

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