A new method has been developed for describing and parameterizing the cross sections for the fission of heavy nuclei by neutrons and protons in energy range above 100 MeV. The expression for ...parameterization of the cross sections was obtained on the basis of phenomenological concept of decay modes of highly excited nuclei formed after the first fast stage of the nucleon–nucleus interaction. The developed method well reproduces the energy dependence of the fission cross sections predicting their weak dependence on the energy and type of the nucleon in the high-energy region.
Development of the SiPM Power Supply Unit Eremkina, I. N.; Rogov, V. Yu; Sergeev, S. V. ...
Physics of particles and nuclei letters,
12/2023, Letnik:
20, Številka:
6
Journal Article
Recenzirano
The 16-channel power supply (PS) unit for silicon photo-multipliers (SiPMs) has been developed. Each channel of the SiPM PS unit has parameters as follows: the output voltage range is 24–28 V with a ...step of
dV
≈ 1 mV; reading back of the actual channel voltage value with a step of
dV
= 8 mV; max output current is 50 mA. Special control software has been developed for these units. This software has the following features: setting of the voltage values in channels, read-out of the actual value of channel voltages, and settings reading back. The control software also allows the creation of configuration files of voltage settings for different run conditions, to save them, and to upload these settings back to the power supply unit. The SiPM PS unit will be used for the barrel detector and neutrons detectors of the BM@N setup 1.
Scintillation detectors with SiPM readout are developed for trigger systems and neutron time-of-flight measurements in the framework of the NICA project at JINR. Some detectors are operated in a ...strong magnetic field of the BM@N and MPD setups. New projects of detectors with picosecond time resolution for trigger of nucleus–nucleus collisions in collider experiment and neutron time-of-flight measurements are discussed.
Monte-Carlo simulation was used to study the background conditions which affect the performance of the trigger system of the BM@N experiment. A GEANT4 + QGSM software package was used for the ...simulation. The influence of the background from δ-electrons was estimated and measures to minimize this background were evaluated. Addition of lead shielding and a small change in the geometry of the target zone allow to reduce the background. The efficiency of the modified trigger system was calculated for Au+Au collisions as a function of the impact parameter. The efficiency is 100% for central and semi-central collisions.
The modular Cherenkov detectors based on MCP-PMTs are developed for study Au+Au collisions in MPD and BM@N experiments with beams of Nuclotron and future collider NICA in Dubna. The aim of the ...detector is fast and effective triggering nucleus–nucleus collisions and generation of start signal for TOF detectors. The detector performance is studied with MC simulation and test measurements with a beam of Nuclotron.
The production of quasimonoenergetic high-energy neutrons at zero angle (0°) in the spallation of relativistic heavy nuclei is discussed by considering the example of the interaction of lead nuclei ...with light target nuclei. It is shown that this process can be used to generate a beam of high-energy neutrons at existing heavy ion accelerators. At the same time, itmay lead to the appearance of a parasitic neutron beam because of the interaction of the heavy-ion beam used with beam line and experimental setup materials.
A new specialized MPD Test Beam setup was mounted at the extracted beam of the Nuclotron at the Joint Institute for Nuclear Research to carry out methodical research and test detectors produced for ...the MPD experiment at the NICA accelerating facility. The setup is described in detail. The results of the testing of fast detectors for the MPD time-of-flight system are presented as an example of the operation of the setup.
The work is devoted to simulation of the characteristics of trigger detectors and the efficiency of the interaction trigger as a part of the upgarde program of the BM@N facility for study Au + Au ...collisions. The study is carried out using the DCM-QGSM + GEANT4 code-based simulation. Recommendations for changing the geometry of the target zone of detectors in order to suppress the background from δ-electrons are given. It is shown that the inclusion of information from the detector of fragments of the beam nuclei and the hadron calorimeter into the trigger of the fast interaction provides a more reliable selection of events by centrality.
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