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Tytuł:
Accelerator and detector physics at the Bern medical cyclotron and its beam transport line
Autorzy:
Auger, M.
Braccini, S.
Ereditato, A.
Häberli, M.
Kirillova, E.
Nesteruk, K. P.
Scampoli, P.
Powiązania:
https://bibliotekanauki.pl/articles/147455.pdf
Data publikacji:
2016
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
beam monitoring
medical cyclotrons
particle accelerators
particle detectors
Opis:
The cyclotron laboratory for radioisotope production and multi-disciplinary research at the Bern University Hospital (Inselspital) is based on an 18-MeV proton accelerator, equipped with a specifi cally conceived 6-m long external beam line, ending in a separate bunker. This facility allows performing daily positron emission tomography (PET) radioisotope production and research activities running in parallel. Some of the latest developments on accelerator and detector physics are reported. They encompass novel detectors for beam monitoring and studies of low current beams.
Źródło:
Nukleonika; 2016, 61, 1; 11-14
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical simulation of space charge effects in the sector cyclotron
Autorzy:
Onischenko, L.
Samsonov, E.
Aleksandrov, V.
Shevtsov, V.
Shirkov, G.
Tuzikov, A.
Powiązania:
https://bibliotekanauki.pl/articles/148737.pdf
Data publikacji:
2003
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
sector cyclotron
particle dynamics
Opis:
To study the effects of space charge in cyclotrons and synchrocyclotrons the code PHASCOL is developed. A method of large (macro)particles is realized in this code. The complete equations of motion of the charged particle in electromagnetic field of accelerator are integrated taking into account the three-dimensional self-electric field of beam. Two methods were used for the calculation of the beam field: the particle-to-particle method and the particle-in-cell one. The results of calculations which illustrate space-charge effects on the parameters of beam in the process of acceleration are given. Both methods have shown a similar influence of space charge on the beam.
Źródło:
Nukleonika; 2003, 48,suppl.2; 45-48
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Sum rule of the correlation function
Autorzy:
Mrówczyński, S.
Maj, R.
Powiązania:
https://bibliotekanauki.pl/articles/147374.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
particle correlations
nuclear collisions
Opis:
We discuss a sum rule satisfied by the correlation function of two particles with small relative momenta. We first derive the sum rule, which results from the completeness condition of the quantum states of the two particles, and then we discuss it for the case of strongly interacting pair of neutron and proton and for the Coulomb system of two charged particles.
Źródło:
Nukleonika; 2004, 49,suppl.2; 27-31
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Methods for close-track efficiency study
Autorzy:
Mikhailov, K.
Stavinskiy, A.
Vlassov, A.
Mestayer, M.
Powiązania:
https://bibliotekanauki.pl/articles/147426.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
particle correlations
close track efficiency
Opis:
We describe two new methods for the study of close track efficiency. One is based on the study of a correlation function for particles with different masses as a function of their relative momenta in the laboratory reference system. The other method is based on the analysis of artificial events, constructed by merging raw data from separate events. Both methods and the standard Monte Carlo method were applied to data from the CLAS detector at Jefferson Laboratory. All three methods provide the same result for close track efficiency with an accuracy sufficient for practical application.
Źródło:
Nukleonika; 2004, 49,suppl.2; 85-88
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Obtaining the specific heat of hadronic matter from CERN/RHIC experiments
Autorzy:
Mekjian, A.
Powiązania:
https://bibliotekanauki.pl/articles/148451.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
specific heat
particle-yields mass-spectrum
Opis:
The specific heat of hot hadronic matter is related to particle production yields from experiments done at CERN/RHIC. The mass fluctuation of excited hadrons plays an important role. Connections of the specific heat, mean hadronic mass excited and its fluctuation with properties of baryon and electric charge chemical potentials (value, slope and curvature) are also developed. A possible divergence of the specific heat as 1/(T0 – T)2 is discussed. Some connections with net charge fluctuations are noted.
Źródło:
Nukleonika; 2006, 51,suppl.3; 73-78
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Stable Bose-Einstein correlations
Autorzy:
Csörgo, T.
Hegyi, S.
Zajc, W.
Powiązania:
https://bibliotekanauki.pl/articles/147334.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
particle correlations
Bose-Einstein correlations
HBT
Lévy distributions
multiparticle production in high energy particle and nuclear physics
Opis:
The shape of Bose-Einstein (or HBT) correlation functions is determined for the case when particles are emitted from a stable source, obtained after convolutions of large number of elementary random processes. The two-particle correlation function is shown to have a stretched exponential shape, characterized by the Lévy index of stability 0 < alfa less-than or equal to 2 and the scale parameter R. The normal, Gaussian shape corresponds to a particular case, when alfa = 2 is selected. The asymmetry parameter of the stable source, beta is shown to be proportional to the angle, measured by the normalized three-particle cumulant correlations.
Źródło:
Nukleonika; 2004, 49,suppl.2; 7-10
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Cosmic future of nuclear and particle physics
Autorzy:
Wrochna, G.
Powiązania:
https://bibliotekanauki.pl/articles/147930.pdf
Data publikacji:
2005
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
astronomy
nuclear physics
particle physics
astroparticle physics
Opis:
Abstract Astronomy and nuclear or particle physics are often considered as two opposite extremes, but in fact their common part is not empty and still enlarging. In this brief review we trace their common roots and we look for their common future. We predict that soon they will de facto merge in terms of phenomena being studied, theories used to describe them as well as experimental techniques. We gave several examples, devoting special attention to the "Pi of the Sky" project searching for optical flashes of astrophysical origin.
Źródło:
Nukleonika; 2005, 50,suppl.3; 25-31
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Correlation femtoscopy
Autorzy:
Lednický, R.
Powiązania:
https://bibliotekanauki.pl/articles/147326.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
particle
emission
correlations
spin
flow
delay
interaction
Opis:
Recent results on particle momentum and spin correlations are discussed, particularly, in view of the role played by the effect of final state interaction. It is demonstrated that this effect allows for (i) correlation femtoscopy with unlike particles; (ii) study of the relative space-time asymmetries in the production of different particle species (e.g., relative time delays or spatial shifts due to collective flows); (iii) study of the particle strong interaction hardly accessible by other means (e.g., in logical and logical and system).
Źródło:
Nukleonika; 2004, 49,suppl.2; 3-6
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charge balance functions and the transverse flow
Autorzy:
Bożek, P.
Powiązania:
https://bibliotekanauki.pl/articles/148366.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
ultrarelativistic heavy-ion collisions
particle correlations
collective flow
Opis:
Correlations between opposite charge particles emitted in ultrarelativistic heavy-ion collisions can be used as a measure of the transverse flow present at the time of the decoupling of the charged pair. The width of the charge balance function in azimuthal angle depends on the transverse velocity and the temperature of the emitting source. Asymmetry in the balance function between in plane and out of plane emission can serve as a probe of the azimuthal asymmetry of the velocity field in the source.
Źródło:
Nukleonika; 2006, 51,suppl.3; 51-54
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Incrustation of alpha-particle emitters in the source backing: influence on activity measurements
Autorzy:
Jurado-Vargas, M.
Fernández-Timón, A.
Powiązania:
https://bibliotekanauki.pl/articles/146904.pdf
Data publikacji:
2012
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
alpha-particle spectrometry
Monte Carlo (MC) simulation
SRIM
Opis:
Alpha particles emitted from radioactive sources are often measured using a 2pi counting geometry in order to determine the activity with a low deviation. The ratio C2pi/A (counting rate/activity) can, however, deviate from the theoretical value of 0.5 because of backscattering in the backing material, scattering and absorption of alpha particles in the source. The experimental counting rates are, therefore, corrected for these effects (backscattering for all sources, plus self-absorption for sources of non-negligible thickness) to determine the real source activity. However, the corrections needed for situations corresponding to alpha-particle sources in which the radionuclides are not deposited but incrusted in the backing material have not been considered. The aim of the present work was therefore to study the influence that incrustation in the backing can have on the total detection efficiency, and hence on the activity estimated for the source. To this end, we used the Monte Carlo computer code SRIM to model the behaviour of the alpha particles in the backing material.
Źródło:
Nukleonika; 2012, 57, 4; 569-573
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Study of influence of particle identification in ALICE detectors and resonance decays on correlation functions
Autorzy:
Malinina, L.
Batyunya, B.
Zaporozhets, S.
Powiązania:
https://bibliotekanauki.pl/articles/147446.pdf
Data publikacji:
2004
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
heavy-ion collisions
HBT
correlation function
particle identification
Opis:
The information about dynamics of the collective expansion of the source created in heavy ion collisions can be extracted by using intensity interferometry in different regions of rapidity and transverse momentum (pt). The study of different factors affecting the pt-dependence of the radii and the strength of the correlation is necessary and that is why we have studied the influence of the particle identification efficiency and the presence of the pions from resonance decays on (pi+,pi+) correlation function measured by ALICE experiment.
Źródło:
Nukleonika; 2004, 49,suppl.2; 99-102
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Numerical simulations of generation of high-energy ion beams driven by a petawatt femtosecond laser
Autorzy:
Domański, J
Badziak, J.
Jabłoński, S.
Powiązania:
https://bibliotekanauki.pl/articles/146458.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
laser acceleration
laser plasma
ions
particle-in-cell simulations
Opis:
This contribution presents results of a Particle-in-Cell simulation of ion beam acceleration via the interaction of a petawatt 25 fs laser pulse of high intensity (up to ~1021 W/cm2) with thin hydrocarbon (CH) and erbium hydride (ErH3) targets of equal areal mass density (of 0.6 g/m2). A special attention is paid to the effect that the laser pulse polarization and the material composition of the target have on the maximum ion energies and the number of high energy (>10 MeV) protons. It is shown that both the mean and the maximum ion energies are higher for the linear polarization than for the circular one. A comparison of the maximum proton energies and the total number of protons generated from the CH and ErH3 targets using a linearly polarized beam is presented. For the ErH3 targets the maximum proton energies are higher and they reach 50 MeV for the laser pulse intensity of 1021 W/cm2. The number of protons with energies higher than 10 MeV is an order of magnitude higher for the ErH3 targets than that for the CH targets.
Źródło:
Nukleonika; 2015, 60, 2; 229-232
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
How to measure specific heat using event-by-event average pT fluctuations
Autorzy:
Tannenbaum, M.
Powiązania:
https://bibliotekanauki.pl/articles/148439.pdf
Data publikacji:
2006
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
relativistic heavy-ion collisions
event-by-event fluctuations
specific heat
particle correlations
Opis:
A simple way to visualize event-by-event average pT fluctuations is by assuming that each collision has a different temperature parameter (inverse pT slope) and that the ensemble of events has a temperature distribution about the mean, less than T greater than , with standard deviation sigmaT. PHENIX characterizes the non-random fluctuation of MpT, the event-by-event average pT, by FpT, the fractional difference of the standard deviation of the data from that of a random sample obtained with mixed events. This can be related to the temperature fluctuation: FpT = sigmaMpTdata/sigmaMpTrandom - 1 ~ (less than eta greated than-1)sigmaT 2/ less thanT greated than 2. Combining this with the Gavai et al. [5] and Korus et al. [6] definitions of the specific heat per particle, a simple relationship is obtained: cv/T3 = less than eta greated than/less than Ntot greated than )Ĺ(1/FpT). FpT is measured with a fraction less than eta greated than)Ntot* of the total particles produced, a purely geometrical factor representing the fractional acceptance, ~1/33 in PHENIX. Gavai et al. [5] predict that cv/T3 = 15, which corresponds to FpT ~ 0.20% in PHENIX, which may be accessible by measurements of MpT in the range 0.2 d pT d 0.6 GeV/c. In order to test the Gavai et al. prediction that cv/T3 is reduced in a QGP compared to the ideal gas value (15 compared to 21), precision measurements of FpT in the range 0.20% for 0.2 less-than or equal to pT greater-than or equal to 0.6 GeV/c may be practical.
Źródło:
Nukleonika; 2006, 51,suppl.3; 93-97
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Application of the new Monte Carlo code AlfaMC to the calibration of alpha-particle sources
Autorzy:
Jurado Vargas, M.
Fernández Timón, A.
García Orellana, C.
Powiązania:
https://bibliotekanauki.pl/articles/148497.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
alpha-particle spectrometry
code AlfaMC
Monte Carlo simulation
scattering and self-absorption
Opis:
Measurements of α-particle sources require corrections to the counting rate due to scattering and self- -absorption in the source and the backing material. In this study, we describe a simple procedure to estimate these corrections using the new Monte Carlo code AlfaMC to consider the effects of scattering and self-absorption conjointly, and so to determine the activity of α emitters. The procedure proposed was applied to 235UO2 sources deposited on highly polished platinum backings. In general, the dependence of the efficiency with source thickness was in good agreement with a simple model considering a linear and a hyperbolic behavior for thin and thick sources, respectively, although significant deviations from this model were found for very thin sources. For these very thin sources, the Monte Carlo simulation revealed to be as a required method in the primary calibration of α-particle sources. The efficiency results obtained by simulation with AlfaMC were in agreement with available efficiency data.
Źródło:
Nukleonika; 2015, 60, No. 3, part 2; 651-655
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Hot electron refluxing in the short intense laser pulse interactions with solid targets and its influence on K-α radiation
Autorzy:
Horný, W.
Klimo, O.
Powiązania:
https://bibliotekanauki.pl/articles/148753.pdf
Data publikacji:
2015
Wydawca:
Instytut Chemii i Techniki Jądrowej
Tematy:
electron recirculation
electron refluxing
K-α radiation
laser–plasma interactions
particle-in-cell simulation
Opis:
Fast electrons created as a result of the laser beam interaction with a solid target penetrate into the target material and initialize processes leading to the generation of the characteristic X-ray K-α radiation. Due to the strong electric field induced at the rear side of a thin target the transmitted electrons are redirected back into the target. These refl uxing electrons increase the K-α radiation yield, as well as the duration of the X-ray pulse and the size of the radiation emitting area. A model describing the electron refl uxing was verifi ed via particle- -in-cell simulations for non-relativistic electron energies. Using this model it was confi rmed that the effect of the electron refluxing on the generated X-ray radiation depends on the target thickness and the target material. A considarable increase of the number of the emitted K-α photons is observed especially for thin targets made of low-Z materials, and for higher hot electron temperatures.
Źródło:
Nukleonika; 2015, 60, 2; 233-237
0029-5922
1508-5791
Pojawia się w:
Nukleonika
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 20

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