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    Wyświetlanie 1-9 z 9
    Tytuł:
    Resonance production in heavy ion collisions
    Autorzy:
    Markert, Ch.
    Powiązania:
    https://bibliotekanauki.pl/articles/146392.pdf
    Data publikacji:
    2004
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    resonance
    strangeness
    baryon
    freeze-out
    lifetime
    fireball
    Opis:
    Resonances and their decay products may interact strongly with the hadrons in the fireball medium from the time of chemical freeze-out until the system breaks up at kinetic freeze-out. In order to try to further our understanding of the evolution and expansion of this hot and dense medium we compare resonance particle yields and spectra from elementary p+p and heavy ion collisions.
    Źródło:
    Nukleonika; 2004, 49,suppl.2; 119-123
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Assessment of a new scintillation crystal (LaBr3) in PET scanners using Monte Carlo method
    Autorzy:
    Karimian, A. E.
    Thompson, Ch. J.
    Powiązania:
    https://bibliotekanauki.pl/articles/146815.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    PET
    scintillation crystals
    Monte Carlo
    lanthanum bromide
    Opis:
    The main aim of this work is to investigate the use of new lanthanum bromide (LaBr3) in whole body PET (WB-PET) scanners and to compare the obtained results with those for BGO and LSO crystals which are currently used in conventional and dedicated PET systems. Our results show that there is a gain in noise effective count rate (NECR) arising from the reduced scatter and random fractions in a LaBr3 scanner. The spatial resolution of the WB-PET with LaBr3 is slightly worse than the LSO and BGO crystals because of its low density and effective atomic number. But our study showed the increased NECR, excellent energy resolution and low decay time of LaBr3 which promise a significant improvement in WB-PET performances especially for narrow coincidence windows.
    Źródło:
    Nukleonika; 2008, 53, 1; 5-6
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The national radioactivity monitoring network of the Netherlands
    Autorzy:
    Deurwaarder, Ch.
    Hoogeboom, K.
    Van Tuinen, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/148049.pdf
    Data publikacji:
    2001
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    calibration
    monitoring systems
    Opis:
    Since the first activities concerning the monitoring networks of the Netherlands in 1986 a lot of optimalisation and adaptation steps have been made. A good maintenance regime, both for computer systems, software and for measuring stations is the key solution to trust in the early warning function of the network. Starting in 1986 the Nuclear Research and Consultancy Group (NRG) has built up a large expertise in the construction and maintenance of such early warning systems. This is also the benefit of having calibration facilities available on the company area of NRG for the different types of detection systems: calibrations can be performed for systems for gamma radiation, aerosols, iodine and the noble gases. Finally, with the Incident application, NRG can provide for the organisations involved in emergency planning and response a robust, user-friendly PC-application. With this application not only data can be extracted from a local computer system, at this moment tests are done with getting data from an external FTP-server.
    Źródło:
    Nukleonika; 2001, 46, 4; 131-135
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    New microwave assisted radiolabelling method and rat brain biodistribution study of two new 99mTc-tricarbonyl complexes as potential brain imaging agents
    Autorzy:
    Trabelsi, M.
    Mekni, A.
    Solanki, Ch.
    Maltby, P.
    Saidi, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/147766.pdf
    Data publikacji:
    2008
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Opis:
    Two new cyclopentadienyl piperidine derivatives, namely ferrocene carboxylic acid 1-ethyl-3-hydroxypiperidinyl ester and ferrocene carboxylic acid 4-hydroxypiperidinyl ester, were synthesized. The ligands were then radiolabelled with 99mTc using two different approaches. The first method consisted of reacting the ligand precursor with Mn(CO)5Br in pertechnetate 99mTcO4 - in normal saline and dimethyl formamide (DMF) at 150°C for 1 h. The yields were 70% and 90%, respectively. For the second method, the reactions mixtures were placed in a microwave oven for 2 min at 650 watt. The yields were higher than 90% for both 99mTc complexes. Biodistribution studies showed that tricarbonyl{eta5- [carboxy-3-hydroxy(N-ethyl)piperidine]cyclopentadienyl}technetium(I) had the highest brain uptake. The regional distribution in the brain also demonstrated relatively higher uptake of tricarbonyl{eta5-[carboxy-3-hydroxy(N-ethyl) piperidine]cyclopentadienyl}technetium(I) in the colliculus (1.97% ID/g tissue,) with the colliculus to cerebellum ratio of 1.99. We conclude that the radiolabelling can be achieved by microwave activation, and tricarbonyl{eta5-[carboxy-3- hydroxy(N-ethyl)piperidine]cyclopentadienyl}technetium(I) has the potential for use as central nervous system (CNS) imaging agent.
    Źródło:
    Nukleonika; 2008, 53, 3; 97-101
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Dose sensitivity enhancement on polymer gel with suspended gold particles
    Autorzy:
    Afonso, L. C.
    Schöfer, F.
    Hoeschen, Ch.
    Caldas, L. V. E.
    Powiązania:
    https://bibliotekanauki.pl/articles/146797.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    polymer gel
    dose enhancement
    radiation therapy
    X-rays
    Opis:
    The presence of high Z material adjacent to soft tissue, when submitted to irradiation, enhances locally the absorbed dose in these soft tissues. Such an effect occurs due to the outscattering of photoelectrons from the high Z material. Polymer gel (PG) dosimeters were used to investigate this effect. Analytic calculations to estimate the dose enhancement were performed. Samples containing a polymer gel with 0.005 gAu/gPG and a pure polymer gel were irradiated using an X-ray beam produced by 150 kV, filtered with 4 mm Al and 5 mm Cu, which resulted in an approximately 20% greater absorbed dose in the samples with gold in comparison to those with the pure polymer gel. The analytic calculations resulted in a dose enhancement factor of approximately 30% for the gold concentration of 0.005 gAu/gPG.
    Źródło:
    Nukleonika; 2012, 57, 4; 467-472
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Freeze-out and anisotropic flow in microscopic models
    Autorzy:
    Bravina, L.
    Tywoniuk, K.
    Zabrodin, E.
    Burau, G.
    Bleibel, J.
    Fuchs, Ch.
    Faessler, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/148598.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    ultrarelativistic heavy-ion collisions
    elliptic flow
    freeze-out of particles
    Monte-Carlo quark-gluon string model
    Opis:
    It appears that in microscopic calculations hadrons are continuously emitted from the whole reaction volume. Different species decouple at different times. At RHIC energies significant fractions of both mesons and baryons are emitted from the surface region within the first two fm/c. The hadrons contribute differently to the formation and evolution of the anisotropic flow, which can be decomposed into three components: (i) flow created by hadrons emitted from the surface at the onset of the collision; (ii) flow produced by jets; (iii) hydrodynamic flow. Due to these features, e.g., the elliptic flows of mesons and baryons have different transverse momentum dependences. Comparison with experimental data reveals that centrality, rapidity, and transverse momentum dependences of the anisotropic flow are reproduced, at least qualitatively, by the microscopic models.
    Źródło:
    Nukleonika; 2006, 51,suppl.3; 3-6
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of hadronic rescattering on the elliptic flow after the hydrodynamics model
    Autorzy:
    Ma, G.
    Ma, Y.
    Sa, B.
    Cai, X.
    He, Z.
    Huang, H.
    Long, J.
    Shen, W.
    Zhong, Ch.
    Chen, J.
    Zuo, J.
    Zhang, S.
    Shi, X.
    Powiązania:
    https://bibliotekanauki.pl/articles/148372.pdf
    Data publikacji:
    2006
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    elliptic flow
    hydrodynamic model
    hadronic rescattering
    LUCIAE model
    Opis:
    Abstract A hydrodynamics + hadronic rescattering model is used to simulate Au+Au collisions at 200 GeV and a Cooper-Frye method is adopted for hadronization. The effect of hadronic rescattering on elliptic flow V2 in 20 40% Au+Au collisions at 200 GeV has been investigated. It is found that the hadronic rescattering can suppress elliptic flow V2 and makes an asymmetric system in momentum space tend to be less anisotropic. The suppression effect becomes weak with increasing transverse momentum. In addition, the effect of hadronic rescattering on transverse momentum spectra and anisotropy of hadronic coordinate space is presented.
    Źródło:
    Nukleonika; 2006, 51,suppl.3; 21-27
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Recent developments for high intensity beams at GANIL
    Autorzy:
    Moscatello, M.
    Anger, P.
    Berthe, C.
    Bertrand, P.
    Bru, B.
    David, L.
    Di Giacomo, M.
    Jamet, Ch.
    Ozille, M.
    Pellemoine, F.
    Petit, E.
    Savalle, A.
    Vignet, J.-L.
    Powiązania:
    https://bibliotekanauki.pl/articles/146199.pdf
    Data publikacji:
    2003
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    cyclotron
    diagnostics
    electrostatic deflectors
    RF system
    high intensity beam
    Opis:
    In December 2001, a 5 kW beam was accelerated for the first time at GANIL. This performance was achieved after the increase of SSC2 dee voltage from 170 kV to 200 kV. Moreover, several technical developments have been done, to improve the operation with high intensity beams, and a new electrostatic deflector is under construction in order to reduce losses and activation at the exit of SSC2. This paper presents an overview of these works and the main results on the last accelerated beams.
    Źródło:
    Nukleonika; 2003, 48,suppl.2; 155-158
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Experimental results on advanced inertial fusion schemes obtained within the HiPER project
    Autorzy:
    Batani, D.
    Gizzi, L. A.
    Koester, P.
    Labate, L.
    Honrubia, J.
    Antonelli, L.
    Morace, A.
    Volpe, L.
    Santos, J. J.
    Schurtz, G.
    Hulin, S.
    Ribeyre, X.
    Nicolai, P.
    Vauzour, B.
    Dorchies, F.
    Nazarov, W.
    Pasley, J.
    Richetta, M.
    Lancaster, K.
    Spindloe, Ch.
    Tolley, M.
    Neely, D.
    Kozlová, M.
    Nejdl, J.
    Rus, B.
    Wołowski, J.
    Badziak, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/147696.pdf
    Data publikacji:
    2012
    Wydawca:
    Instytut Chemii i Techniki Jądrowej
    Tematy:
    advanced ignition schemes
    fast ignition
    shock ignition
    inertial fusion
    propagation of fast electrons
    short-pulse ultra-high-intensity laser
    shock compressed matter
    cylindrical implosions
    Opis:
    This paper presents the results of experiments conducted within the Work Package 10 (fusion experimental programme) of the HiPER project. The aim of these experiments was to study the physics relevant for advanced ignition schemes for inertial confinement fusion, i.e. the fast ignition and the shock ignition. Such schemes allow to achieve a higher fusion gain compared to the indirect drive approach adopted in the National Ignition Facility in United States, which is important for the future inertial fusion energy reactors and for realising the inertial fusion with smaller facilities.
    Źródło:
    Nukleonika; 2012, 57, 1; 3-10
    0029-5922
    1508-5791
    Pojawia się w:
    Nukleonika
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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