Results of simulation and measurements on the LEETECH facility with quartz Cherenkov detector prototype which is one of the candidates for the time-of-flight technique implementation at the upgraded ...BES-III and HIEPA (China) experiments are presented. The dependence of the electrons time variation from opening of the collimators is determined. The results of the dependence of time registration of Cherenkov exposure from spatial displacement of the quartz bar with the size 20 ⨯ 40 ⨯ 200 mm are presented. Time resolution of 50 ps was measured during the experiment. The obtained results are in agreement with the expected and demonstrate the possibility of the application of quartz detectors of this type for determining the kinds of the particles.
A new versatile facility LEETECH for detector R&D, tests and calibration is designed and constructed. It uses electrons produced by the photoinjector PHIL at LAL, Orsay and provides a powerful tool ...for wide range R&D studies of different detector concepts delivering “mono-chromatic” samples of low energy electrons with adjustable energy and intensity. Among other innovative instrumentation techniques, LEETECH will be used for testing various gaseous tracking detectors and studying new Micromegas/InGrid concept which has very promising characteristics of spatial resolution and can be a good candidate for particle tracking and identification. In this paper the importance and expected characteristics of such facility based on detailed simulation studies are addressed.
Response of magnetic nanoparticle assemblies Kondratyev, V N; Krylov, V V; Bezshyyko, O A ...
Journal of physics. Conference series,
01/2012, Letnik:
393, Številka:
1
Journal Article
Recenzirano
Odprti dostop
Properties of magnetic nanoparticle assemblies are analysed by employing the randomly jumping interacting moments model including quantum fluctuations, ferromagnetic inter-particle coupling and ...disorder. Using spatially uniform external field we find the respective magnetic state equation and phase diagram indicating an existence of spinodal regions and critical points. Possibilities to use such systems as magnetoresistive sensors are considered.
The LEETECH (Low Energy Electron TECHnique) electron test beam facility has been designed and manufactured at Laboratoire de l’Accelerateur Lineaire (Orsay, France). Energy of electron beam can vary ...from 100 keV to 5 MeV. Two measurement sessions with application of the diamond sensor and the Micromegas/InGrid tracking module characterization were performed. Complete facility design with the Geant4 simulation, mechanical design, implementation of remote control and readout system is presented. An option to generate the electron bunches including a few particles only is confirmed, the obtained results are in rather good agreement with the corresponding simulation within uncertainty. Main results with the preliminary analysis from the Micromegas/InGrid measurement session are also presented.
The isomer ratios for nuclei
104
m,g
Ag,
110
m,g
In,
108
m,g
In as products of the photonuclear reactions
107
Ag(γ, 3n)
104
m,g
Ag,
113
In(γ, 3n)
110
m,g
In,
109
Ag(γ, 5n)
104
m,g
Ag,
115
In)(γ, 5n)
...110
m,g
In,
115
In(γ, 7n)
108
m,g
In are obtained. The Bremsstrahlung of electrons with energies within 32–84 MeV from the LU-40 linear accelerator was used for the irradiation of targets. The energy resolution and mean current of the electron beam were ∼1% and 5 μA, respectively. The induced activity was used to obtain experimental isomer ratios. An HPGe spectrometer with an energy resolution of 1.9 keV for
60
Co γ-line 1332 keV was used to acquire the instrumental γ-ray spectra of the activation products. A set of serial measurements with various acquisition times was performed. The cooling times varied from 5 seconds to several hours for Ag and up to tens of hours for In specimens. The obtained experimental isomer ratios are compared with the results from theoretical calculations.
Doses and fluences in the experimental hall and equipment are calculated for the CBM project of the future accelarator Facility for Antiproton and Ion Research in Darmstadt. The calculations are ...based on the FLUKA code adapted to the CBMROOT framework.
Neutron detection with a stack of two detector foils of CR-39 (intercast) was studied. A comparison between the experimental results (exposure to 14.8
MeV neutrons) and the results of a computer ...simulation was performed. Emphasis was given to the detection of
α
particles—products of the break-up reaction of the
12C nucleus—and to heavier recoil nuclei. The detectors were chemically etched and analysed with an automatic counting system. All detector surfaces were analysed, and the coincidence tracks produced by the same particles on detector surfaces in contact were determined. These tracks facilitate characterization of the type and energy of the recoil nuclei. Further separation was made on the basis of the distribution of size and darkness of the tracks.
We present the results from measuring and calculatoffing the isomeric ratios for the
87
m,g
Y nucleus produced in the
90
Zr(γ, 2np)
87
g,m
Y and
91
Zr(γ, 3np)
87
g,m
Y reactions, and for the
86
m,g
Y ...nucleus produced in the
90
Zr(γ, 3np)
86
g,m
Y and
91
Zr(γ, 4np)
86
g,m
Y reactions. The method of measuring the induced activity of irradiated samples with a semiconductor spectrometer based on an HPGe detector with a relative efficiency of 20% and an energy resolution of 1.9 keV for the 1332 keV
60
Co line was used to determine the isomeric ratios. The obtained results are compared to calculations using the TALYS code, employing statistical and preequilibrium model approaches.
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