Description
https://jinr.webex.com/jinr/j.php?MTID=m23f10d08e276f37848aa98c276790793
A method for registering high-energy γ-rays using the array of 9xCeBr3-NaI(Tl) phoswich-detectors [1] is investigated. The technique makes it possible to identify high-energy γ-rays formed during the γ-decay of giant dipole resonances (GDR) from cascades of low-energy "yrast" γ-rays with a similar total energy.
The main characteristics of gamma-ray spectrometer: the energy resolutions ΔE, the...
PXI-compatible card combining amplifier and preamplifier for proportional gas counters is presented. This PXI-compatible amplifier/preamplifier is developed for purpose of usage with proportional gas counter sensitive to 14.4 keV and PXI-based spectrometers developed on Palacký University in Olomouc [1], [2]. The card is based on Amptek A225 and Amptek A206 integrated circuits. It allows...
The discovery of the Super Heavy Elements (SHE) with atomic number Z=113-118 as well as new neutron excess isotopes of the elements with Z=104-112 was one of the outstanding scientific results of the last decades. These high priority experiments were carried out on the cyclotron U400 of the FLNR (JINR, Dubna, Russia). The synthesis of the new super heavy elements stimulated works on the...
One-dimensional detector for time-resolved diffraction studies at a synchrotron radiation beam operating in photon counting mode is under development in the Budker Institute of Nuclear Physics Siberian Branch of Russian Academy of Sciences. The detector will allow to store the dynamics of diffraction process and to sort photons by their energy simultaneously. As a sensitive part we suppose to...
The invention of a new method to produce targets stable under prolonged intense irradiation conditions is very important for radiochemistry and nuclear chemistry. We suggest the method called “coupled reduction” which is based on the formation of the intermetallic compound layer. The novelty of our approach is to adapt this method for the preparation of high-power radioactive targets supplying...
The new experimental setup has been built at the 11b channel of the IBR-2 research reactor at FLNP, JINR, to study the elemental composition of samples by registration of prompt gamma emission during thermal neutron capture. The setup consists of a curved mirror neutron guide and a radiation-resistant HPGe high-purity germanium detector. The detector is surrounded by lead shielding to suppress...
In neutron physics experiments, it is very important to have a knowledge and determination of the velocity of the useful neutrons for carrying out a full-fledged experiment. To have a certain speed of slow neutrons, an experimental instrument is needed called a neutron velocity selector.
In the up-going experiments of the JINR FLNP group on the measuring of the reflection coefficient of...
YDA (Yury&DAstan) Builder C++ PC based code has been developed. It allow to provide a data acquisition using 48x128 DSSSD(Double Side Silicon Strip Detector) detector and multi - wire pentane filled low pressure gaseous detector [1]. Main specific of the developed program package is to use flexible real-time algorithms to provide in-fact background free conditions for ultra-rare alpha decays...
In the FLNR JINR at the kinematic separator SHELS the new neutron-deficient isotope $^{249}$No was synthesized for the first time in the complete fusion reaction $^{204}$Pb($^{48}$Ca,3n)$^{249}$No. Using the GABRIELA detection system, the new isotope was identified through genetic correlations with the known daughter and granddaughter nuclei $^{245}$Fm and $^{241}$Cf , and new activity has an...
In this work the study of Compton scattering of annihilation gammas in different polarization states is presented. The pairs of annihilation gammas are acquired as a result of positron-electron annihilation process. Polarization planes of two annihilation gammas are orthogonal to each other. However, the polarization of each photon in pair is indefinite. If one of the photons of the pair...
As part of the TANGRA project [1], we had measured angular distribution of $\gamma$-quanta, arising from the reaction of inelastic scattering of 14.1 MeV neutrons on the $^{12}$C nucleus [2]. Due to the properties of $^{12}$C, the information on its nuclear level structure that can be obtained by the registering $\gamma$-rays from the $^{12}$C(n,n'$\gamma$) reaction is very limited. It was...
Neutrons can be an instrument or object in many fields of research. Major efforts all over the world are devoted to increasing the range of useful neutrons towards smaller energies. However, the progress in the field is limited by the severe decrease of the flux of available slow neutrons, as well as the efficiency of the delivery of such neutrons to experimental installations. The properties...
Radon is a naturally occurring noble radioactive gas formed by the decay of radioactive chains of thorium and uranium. Radon and its daughter decay products are being increasingly studied, and their background contribution to low-background experiments for neutrino studies, dark-matter particle searches and other experiments requiring low-background conditions is also being investigated.
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Modern photodetectors, such as silicon photomultipliers (SiPM), are widely used in high-energy physics. In particular, for the near detector of the JUNO experiment, it is planned to use ~250,000 SiPMs, which will be grouped into matrices (~4000 pcs). These photodetectors will be used to register the light that is emitted as a result of the interaction of neutrinos and the detector's...
