Total Capture Rate of Negative Muons in 24Mg Belov, V. V.; Gusev, K. N.; Zhitnikov, I. V. ...
Physics of particles and nuclei letters,
2022/6, Letnik:
19, Številka:
3
Journal Article
Recenzirano
A description of an experiment devoted to determining the total capture rates of negative muons in
24
Mg is presented. The investigations are carried out using a low-energy muon beam with high ...intensity (10
4
s
–1
) at the SμS meson facility in Villigen, Switzerland, with the help of the mini-Ball cluster of HPGe detectors. The experimental approach based on our previous works is described. The justification of the difference between these methods and those used in previous investigations is presented. It is pointed out that our method is potentially much more precise and does not depend on the muon absorption in the surrounding matter. A comparison of these results with those of previous experiments and theoretical calculations is also presented.
This paper is devoted to the analysis of modern trends in economic cybersecurity. We analysed the dynamics of cyber-attacks over the past five years and, particularly, pointed on the main trends of ...2018 year. Our analysis showed great diversity and variety of cyber-criminal actions: global espionage, financial attacks, card fraud, information theft and phishing, network attacks and traffic interception, cryptographers and extortionists, crypto-jacking. Further, we attempted to predict cyber threats that await us soon. We expected the main problems come from smart cyber-attacks, based on the latest technologies of artificial intelligence (AI) and machine learning (ML), as well as exploiting the vulnerabilities of the Internet of Things. Therefore, we ought to apply integrated approaches using the same innovative technologies. The cyber-crime industry will increasingly consolidate — the efforts will be focused on automating and streaming criminal cyber activities, and new technologies will further reduce the cost of searching for vulnerabilities. It means development of hacking tools while accelerating the speed and scale of attacks. We must implement an integrated, echeloned approach with the same innovative technologies of AI and MO used by hackers, to fight effectively with future cyber threats. Small and medium businesses will have the opportunity to purchase a cyber-defence service. An improvement of the internal IT culture in the company remains the critical issue, which is still a weak link in the chain and the target of cyber-attacks. We discuss the measures of legislative state support in Europe and Russia against cybercrime in the final section of the paper, followed by conclusion.
Searching for the β+EC and EC/EC Decays of 74Se Rukhadze, N. I.; Barabash, A. S.; Brudanin, V. B. ...
Bulletin of the Russian Academy of Sciences. Physics,
08/2020, Letnik:
84, Številka:
8
Journal Article
Recenzirano
Double beta decay (β
+
EC, EC/EC) of
74
Se was investigated at the Modane underground laboratory (LSM, France; 4800 m of water equivalent) using the OBELIX ultralow-background HPGe detector with a ...sensitive volume of 600 cm
3
and a sample of natural selenium with a mass of 1.6 kg containing ~0.89% (~14.24 g) of
74
Se. The new experimental limits for β
+
EC and EC/EC decays of
74
Se to ground 0
+
and excited
596 keV, and
1204 keV states of
74
Ge, were obtained from experimental data accumulated over 135 days.
The NEMO-3 detector has been taking data in the Fréjus underground laboratory (LSM, France) since February 2003 and is devoted to the search for neutrinoless double-beta decay (0νββ). After 389 ...effective days of data collection from February 2003 until September 2004 (Phase I), no evidence for neutrinoless double-beta decay was found from ∼7 kg of 100Mo and ∼1 kg of 82Se. The corresponding limits for the half-lives are T1/2(0νββ) > 4.6 × 1023 yr for 100Mo and T1/2(0νββ) > 1.0 × 1023 yr for 82Se (90% C.L.). They lead to the following limits for the effective Majorana neutrino mass: 〈mν〉 < 0.7–2.8 eV for 100Mo and 〈mν〉 < 1.8–4.9 eV for 82Se. The half-lives of the two-neutrino double-beta decay (2νββ) have been measured for 100Mo, 82Se, 116Cd, 150Nd, and 96Zr and reported here as well.
A new experiment devoted to searches for double electron capture in sup.106Cd decay is being performed at the Modane underground laboratory (4800 mwe) with the 32-detector TGV-2 spectrometer. The ...limit T.sub.1/2 (2υEC/EC) > 2.0 x 10.sup.20 yr at a 90% confidence level (C.L.) was obtained from a preliminary analysis of data obtained over 2250 h of measurements with about 23.2 g sample enriched in the isotope sup.106Cd to 99.57%. The limits T.sub.1/2(KL 2741 keV) > 0.9 x 10.sup.20 yr and T.sub.1/2(KK 2718 keV) >> 1.4 x 10.sup.20yr at a 90% C.L. on the neutrinoless decay of sup.106Cd were obtained from measurements performed with the Obelix low-background spectrometer from high-purity germanium (HPGe spectrometer) for a sample of mass about 23.2 g enriched in the isotope sup.106Cd. DOI: 10.1134/S1063778815060058
Detection of antineutrino by the reaction of the inverse
β
-decay can be used for an independent monitoring of a nuclear reactor power. DANSS detector is located directly under a commercial WWER-1000 ...reactor and counts up to 5000 antineutrino per day, providing the accuracy of 1.5% in 2 days of the flux measurement. A powerful system of the passive and active shielding in combination with the fine spatial segmentation of the detector allows to diminish the contribution of the background processes to a level, negligible in comparison to the statistical error. The influence of the nuclear fuel composition on the neutrino flux can be accounted for based on the input from the NPP staff.
A detector of the reactor antineutrino based on a cubic meter of plastic scintillator is installed below 3.1 GW industrial reactor. The detector is placed on a movable platform which allows to change ...the distance to the reactor core center in the range 10.7-12.7 m. 2500 scintillator strips are read out individually by SiPMs and in groups of 50 by PMTs. In addition to the overburden by the reactor (50 m w.e.) the detector has multilayer passive shielding and active muon veto. Inverse beta-decay count rate of about 5000 events per day in the fiducial volume (78% of the detector) with about 5% of cosmic background has been reached. DANSS is sensitive to sterile neutrino in the most interesting region of mixing parameter space. The article covers the detector status and performance, as well as the first results.
The results of the research in the field of neutrino physics obtained at Kalinin nuclear power plant during 15 years are presented. The investigations were performed in two directions. The first one ...includes GEMMA I and GEMMA II experiments for the search of the neutrino magnetic moment, where the best result in the world on the value of the upper limit of this quantity was obtained. The second direction is tied with the measurements by a solid scintillator detector DANSS designed for remote on-line diagnostics of nuclear reactor parameters and search for short range neutrino oscillations. DANSS is now installed at the Kalinin Nuclear Power Plant under the 4-th unit on a movable platform. Measurements of the antineutrino flux demonstrated that the detector is capable to reflect the reactor thermal power with an accuracy of about 1.5% in one day. Investigations of the neutrino flux and their energy spectrum at different distances allowed to study a large fraction of a sterile neutrino parameter space indicated by recent experiments and perform the reanalysis of the reactor neutrino fluxes. Status of the short range oscillation experiment is presented together with some preliminary results based on about 170 days of active data taking during the first year of operation.
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