Pub Date : 2021-12-25DOI: 10.15407/jnpae2021.04.400
S. Sytova, A. Dunets, A. Kavalenka, S. Charapitsa
A review of the information system for nuclear material accounting and control at the level of the Belarusian regulatory body in the field of nuclear and radiation safety is presented. This system is developed in accordance with International Atomic Energy Agency (IAEA) requirements depicted in Code 10 of the State subsidiary arrangements. The system provides automatic generation of the following accounting reports: physical inventory listing, inventory change report, material balance report, and textual report for each material balance area as well as the corresponding General Ledger. It provides all necessary calculations and pre-calculations, based on input data, to produce accurate accounting reports. The system implements the import/export of data to/from the system using Code 10 (labelled and fixed formats), as well as making adjustments to accounting documents in accordance with IAEA rules. There are two possibilities of nuclear material accounting in the system. The first consists of importing into the system of all reporting documents from the material balance areas of facilities and the subsequent possibility of checking the received data using an independent recalculation tool in the system. The second one includes the registration of all necessary information on nuclear material batches at locations outside facilities and their movement in the material balance area and then automatic generation of all required reports and General Ledger.
{"title":"Belarusian software for nuclear material accounting at the level of the regulatory body","authors":"S. Sytova, A. Dunets, A. Kavalenka, S. Charapitsa","doi":"10.15407/jnpae2021.04.400","DOIUrl":"https://doi.org/10.15407/jnpae2021.04.400","url":null,"abstract":"A review of the information system for nuclear material accounting and control at the level of the Belarusian regulatory body in the field of nuclear and radiation safety is presented. This system is developed in accordance with International Atomic Energy Agency (IAEA) requirements depicted in Code 10 of the State subsidiary arrangements. The system provides automatic generation of the following accounting reports: physical inventory listing, inventory change report, material balance report, and textual report for each material balance area as well as the corresponding General Ledger. It provides all necessary calculations and pre-calculations, based on input data, to produce accurate accounting reports. The system implements the import/export of data to/from the system using Code 10 (labelled and fixed formats), as well as making adjustments to accounting documents in accordance with IAEA rules. There are two possibilities of nuclear material accounting in the system. The first consists of importing into the system of all reporting documents from the material balance areas of facilities and the subsequent possibility of checking the received data using an independent recalculation tool in the system. The second one includes the registration of all necessary information on nuclear material batches at locations outside facilities and their movement in the material balance area and then automatic generation of all required reports and General Ledger.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2021-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80043844","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-25DOI: 10.15407/jnpae2021.04.358
L. Jadoual, A. Afkir, A. El Boujlaidi, M. A. El Fqih, R. Jourdani, A. Kaddouri
Ion photon emission in the wavelength range of 280 - 420 nm resulting from 5 Kr+ ion beam sputtering from titanium in the presence and the absence of oxygen was studied experimentally. The observed spectra consist of a series of discrete lines superimposed with a broadband continuum. Discrete lines are attributed to excited neutral Ti I and excited ions Ti II. The differences in the observed intensities of spectral lines are discussed in terms of the electron-transfer processes between the excited sputtered atom and electronic levels of the solid. The radiative dissociation process and breaking of chemical bonds seem to contribute to the enhancement of emitted photons intensity. Continuum radiation was observed and is very probably related to the electronic structure of titanium. The collective deactivation of 3d-shell electrons appears to play a role in the emission of this radiation.
{"title":"Ion-photon emission from titanium target under ion beam sputtering","authors":"L. Jadoual, A. Afkir, A. El Boujlaidi, M. A. El Fqih, R. Jourdani, A. Kaddouri","doi":"10.15407/jnpae2021.04.358","DOIUrl":"https://doi.org/10.15407/jnpae2021.04.358","url":null,"abstract":"Ion photon emission in the wavelength range of 280 - 420 nm resulting from 5 Kr+ ion beam sputtering from titanium in the presence and the absence of oxygen was studied experimentally. The observed spectra consist of a series of discrete lines superimposed with a broadband continuum. Discrete lines are attributed to excited neutral Ti I and excited ions Ti II. The differences in the observed intensities of spectral lines are discussed in terms of the electron-transfer processes between the excited sputtered atom and electronic levels of the solid. The radiative dissociation process and breaking of chemical bonds seem to contribute to the enhancement of emitted photons intensity. Continuum radiation was observed and is very probably related to the electronic structure of titanium. The collective deactivation of 3d-shell electrons appears to play a role in the emission of this radiation.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2021-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78080673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-25DOI: 10.15407/jnpae2021.04.415
Bilalodin, A. Haryadi, Kartika Sari, Y. Sardjono, RasitoTursinah
Double layer beam shaping assembly (DLBSA) is a system that moderates fast neutrons into epithermal neutrons. The epithermal neutrons that leave the aperture in the DLBSA system are broadened in the space, thereby reducing the intensity and homogeneity of the epithermal neutron beams. Therefore, it is necessary to improve the design. The development of the DLBSA design was carried out using an extension nozzle. The nozzles are designed using materials made in three configurations, namely Ni+LiF load polyethylene, Pb+LiF load polyethylene, and Bi+LiF load polyethylene. The simulation results show that the addition of a nozzle at the tip of the DLBSA can channel the beam more directionally with high intensity. The addition of nozzles with Ni+LiF load PE material produces an epithermal neutron beam that meets the IAEA standards.
{"title":"Design development of double-layer beam shaping assembly using extension nozzle to increase the quality of epithermal neutron beam as a boron neutron capture therapy neutron source","authors":"Bilalodin, A. Haryadi, Kartika Sari, Y. Sardjono, RasitoTursinah","doi":"10.15407/jnpae2021.04.415","DOIUrl":"https://doi.org/10.15407/jnpae2021.04.415","url":null,"abstract":"Double layer beam shaping assembly (DLBSA) is a system that moderates fast neutrons into epithermal neutrons. The epithermal neutrons that leave the aperture in the DLBSA system are broadened in the space, thereby reducing the intensity and homogeneity of the epithermal neutron beams. Therefore, it is necessary to improve the design. The development of the DLBSA design was carried out using an extension nozzle. The nozzles are designed using materials made in three configurations, namely Ni+LiF load polyethylene, Pb+LiF load polyethylene, and Bi+LiF load polyethylene. The simulation results show that the addition of a nozzle at the tip of the DLBSA can channel the beam more directionally with high intensity. The addition of nozzles with Ni+LiF load PE material produces an epithermal neutron beam that meets the IAEA standards.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2021-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82908913","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-25DOI: 10.15407/jnpae2021.04.348
Y. Lobach, E. Luferenko, M. Lysenko, V. M. Shevel
The decommissioning Concept for WWR-M research reactor is developed to meet the requirements of the current Ukrainian legislation. The main goal of the Concept is to provide a strategic stage of the work planning, including all the required justifications with a sufficient level of detail. It will allow during the next planning stage to develop the decommissioning project and other documents required to obtain the decommissioning license. The Concept is the institutional and technical document, which defines and substantiates the basic administrative, organizational, and technical measures for the preparation and implementation of the reactor decommissioning. It also describes the main activities and works, defines the procedure, conditions for their implementation and provision, and planned deadlines.
{"title":"Principal provisions of the decommissioning concept for the WWR-M research reactor","authors":"Y. Lobach, E. Luferenko, M. Lysenko, V. M. Shevel","doi":"10.15407/jnpae2021.04.348","DOIUrl":"https://doi.org/10.15407/jnpae2021.04.348","url":null,"abstract":"The decommissioning Concept for WWR-M research reactor is developed to meet the requirements of the current Ukrainian legislation. The main goal of the Concept is to provide a strategic stage of the work planning, including all the required justifications with a sufficient level of detail. It will allow during the next planning stage to develop the decommissioning project and other documents required to obtain the decommissioning license. The Concept is the institutional and technical document, which defines and substantiates the basic administrative, organizational, and technical measures for the preparation and implementation of the reactor decommissioning. It also describes the main activities and works, defines the procedure, conditions for their implementation and provision, and planned deadlines.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2021-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89074644","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-25DOI: 10.15407/jnpae2021.04.375
J. V. Shylina, O. Molozhava, S. Litvinov, O. P. Dmitriev
The effect of chronic irradiation of Pseudomonas aeruginosa (P. aeruginosa) phytopathogenic strain IMV 9096 and saprophytic strain IMV 8614 at a dose rate of 0.19 µGy/s of γ-radiation in the dose field of 137Cs on the immunomodulatory properties of their lipopolysaccharide (LPS) has been investigated. It was shown that in the wild-type seedlings of Arabidopsis thaliana (A. thaliana) Col-0 pre-treatment with LPS 9096, isolated from both irradiated and non-irradiated bacterial culture, caused an increased harmful effect 2.8 - 5.6 fold when plants were then infected with bacteria of this strain. Seedling damage was more pronounced with the use of LPS, isolated from bacteria exposed to chronic radiation. In seedlings of mutant jin1 with impaired jasmonate signaling pre-treatment of LPS 9096 caused attenuation of the damage at 20 - 45 % when infected with P. aeruginosa 9096. Pre-treatment of Arabidopsis seeds with bacterial LPS 8614, obtained from both irradiated and non-irradiated P. aeruginosa 8614 cultures, had a non-significant effect (± 15 % over control). In mutant plants, jin1 pre-treatment of seeds with LPS 8614 led to increased damage when infected with P. aeruginosa IMV 9096 at 30 - 60 %. It was found that chronic irradiation of bacteria changes the immunomodulatory properties of their LPS and the effect depends on the bacterial strain. This effect is mediated by jasmonate and salicylate signaling systems.
{"title":"Impact of chronic irradiation of IMV 9096 and IMV 8614 strains of Pseudomonas aeruginosa on immunomodulatory properties of their lipopolysaccharide complex","authors":"J. V. Shylina, O. Molozhava, S. Litvinov, O. P. Dmitriev","doi":"10.15407/jnpae2021.04.375","DOIUrl":"https://doi.org/10.15407/jnpae2021.04.375","url":null,"abstract":"The effect of chronic irradiation of Pseudomonas aeruginosa (P. aeruginosa) phytopathogenic strain IMV 9096 and saprophytic strain IMV 8614 at a dose rate of 0.19 µGy/s of γ-radiation in the dose field of 137Cs on the immunomodulatory properties of their lipopolysaccharide (LPS) has been investigated. It was shown that in the wild-type seedlings of Arabidopsis thaliana (A. thaliana) Col-0 pre-treatment with LPS 9096, isolated from both irradiated and non-irradiated bacterial culture, caused an increased harmful effect 2.8 - 5.6 fold when plants were then infected with bacteria of this strain. Seedling damage was more pronounced with the use of LPS, isolated from bacteria exposed to chronic radiation. In seedlings of mutant jin1 with impaired jasmonate signaling pre-treatment of LPS 9096 caused attenuation of the damage at 20 - 45 % when infected with P. aeruginosa 9096. Pre-treatment of Arabidopsis seeds with bacterial LPS 8614, obtained from both irradiated and non-irradiated P. aeruginosa 8614 cultures, had a non-significant effect (± 15 % over control). In mutant plants, jin1 pre-treatment of seeds with LPS 8614 led to increased damage when infected with P. aeruginosa IMV 9096 at 30 - 60 %. It was found that chronic irradiation of bacteria changes the immunomodulatory properties of their LPS and the effect depends on the bacterial strain. This effect is mediated by jasmonate and salicylate signaling systems.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2021-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83967111","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-25DOI: 10.15407/jnpae2021.04.382
V. Krasnov, O. Оrlov, O.V. Zhukovskyi
Based on multiyear monitoring observations, dynamics of 137Сs intake into the main tissues and organs of aboveground phytomass of Scots pine (Pinus sylvestris L.) during 30 years from the Chornobyl accident was determined as well peculiarities of their radioactive contamination. Empirical (observations), radioecological and statistical methods were used. It was found that for the wood increase of values of transfer factor was observed between 1991 and 2002 yrs with the further monotonous decrease of this value up to 2020; in internal bark, 1-year shoots, 2-year shoots, 1-year needles, 2-year needles, twigs thick and twigs thin multiyear dynamics was similar – an increase of values of transfer factor in the period of 1991 - 2002 yrs with further decrease of it up to 2020. At external bark, monotonous decrease of values of transfer factor was found during the whole observation period 1991 - 2020.
{"title":"Dynamics of 137Сs content in tissues and organs of scots pine (Pinus sylvestris L.) in moist fairly infertile pine type of Polissya of Ukraine after Chornobyl accident","authors":"V. Krasnov, O. Оrlov, O.V. Zhukovskyi","doi":"10.15407/jnpae2021.04.382","DOIUrl":"https://doi.org/10.15407/jnpae2021.04.382","url":null,"abstract":"Based on multiyear monitoring observations, dynamics of 137Сs intake into the main tissues and organs of aboveground phytomass of Scots pine (Pinus sylvestris L.) during 30 years from the Chornobyl accident was determined as well peculiarities of their radioactive contamination. Empirical (observations), radioecological and statistical methods were used. It was found that for the wood increase of values of transfer factor was observed between 1991 and 2002 yrs with the further monotonous decrease of this value up to 2020; in internal bark, 1-year shoots, 2-year shoots, 1-year needles, 2-year needles, twigs thick and twigs thin multiyear dynamics was similar – an increase of values of transfer factor in the period of 1991 - 2002 yrs with further decrease of it up to 2020. At external bark, monotonous decrease of values of transfer factor was found during the whole observation period 1991 - 2020.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2021-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84326677","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-25DOI: 10.15407/jnpae2021.04.343
P. Patil, G. B. Hiremath, A. Vinayak, M. Hosamani, V.P. Singh, N. M. Badiger
The nuclear radius parameter of carbon, aluminium, iron, copper, and zinc nuclei has been determined by using (n,γ)-reaction. The neutrons from the americium-beryllium source are made to interact with the water moderator to produce the γ-rays of 2.2 MeV through (n,γ)-reaction. The γ-radiation emitted from the water medium is measured with a scintillation detector coupled to 8k multi-channel analyzer. The neutrons from the americium-beryllium source are allowed to transmit through carbon, aluminium, iron, copper, and zinc elemental targets of various thicknesses, and transmitted neutrons are again allowed to interact with water moderators to produce 2.2 MeV γ-radiation. By measuring the yield of γ-radiation produced in water moderators by neutrons transmitted through elemental targets of different mass number values, the total neutron interaction cross-sections are determined. By knowing the total neutron interaction cross-sections and mass number of the target nuclei, the radius parameter has been determined.
{"title":"Determination of the nuclear radius parameter using the γ-ray spectrometer","authors":"P. Patil, G. B. Hiremath, A. Vinayak, M. Hosamani, V.P. Singh, N. M. Badiger","doi":"10.15407/jnpae2021.04.343","DOIUrl":"https://doi.org/10.15407/jnpae2021.04.343","url":null,"abstract":"The nuclear radius parameter of carbon, aluminium, iron, copper, and zinc nuclei has been determined by using (n,γ)-reaction. The neutrons from the americium-beryllium source are made to interact with the water moderator to produce the γ-rays of 2.2 MeV through (n,γ)-reaction. The γ-radiation emitted from the water medium is measured with a scintillation detector coupled to 8k multi-channel analyzer. The neutrons from the americium-beryllium source are allowed to transmit through carbon, aluminium, iron, copper, and zinc elemental targets of various thicknesses, and transmitted neutrons are again allowed to interact with water moderators to produce 2.2 MeV γ-radiation. By measuring the yield of γ-radiation produced in water moderators by neutrons transmitted through elemental targets of different mass number values, the total neutron interaction cross-sections are determined. By knowing the total neutron interaction cross-sections and mass number of the target nuclei, the radius parameter has been determined.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2021-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78635268","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-25DOI: 10.15407/jnpae2021.04.409
V. I. Gavrilyuk, S. Drapey, B.V. Kaydyk, V. Kirischuk, V. Parkhomenko, O. Romanova, A. Samsonenko, E. I. Katunin, A.V. Boyko
An approach to conducting a qualitative risk assessment in the field of nuclear security was developed. Nuclear security events that might, with a certain probability, take place in Ukraine were identified. Using the method of expert assessment, qualitative assessments of the probabilities of the implementation of identified events and the levels of their consequences were obtained, a matrix of consequences/probabilities, in which Fibonacci numbers were applied when setting the limit values оf risks, was built and a qualitative assessment of risks was carried out. It has been established that in the field of Ukraine's nuclear security, the risk of sabotage at nuclear power plants is the greatest.
{"title":"Nuclear security risks in Ukraine","authors":"V. I. Gavrilyuk, S. Drapey, B.V. Kaydyk, V. Kirischuk, V. Parkhomenko, O. Romanova, A. Samsonenko, E. I. Katunin, A.V. Boyko","doi":"10.15407/jnpae2021.04.409","DOIUrl":"https://doi.org/10.15407/jnpae2021.04.409","url":null,"abstract":"An approach to conducting a qualitative risk assessment in the field of nuclear security was developed. Nuclear security events that might, with a certain probability, take place in Ukraine were identified. Using the method of expert assessment, qualitative assessments of the probabilities of the implementation of identified events and the levels of their consequences were obtained, a matrix of consequences/probabilities, in which Fibonacci numbers were applied when setting the limit values оf risks, was built and a qualitative assessment of risks was carried out. It has been established that in the field of Ukraine's nuclear security, the risk of sabotage at nuclear power plants is the greatest.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2021-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81666280","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-12-25DOI: 10.15407/jnpae2021.04.329
R. Bernabei, P. Belli, A. Bussolotti, V. Caracciolo, F. Cappella, R. Cerulli, C. Dai, A. d’Angelo, N. Ferrari, A. Incicchitti, A. Leoncini, X. Ma, A. Mattei, V. Merlo, F. Montecchia, X. Sheng, Z. Ye
The data collected by the DAMA/LIBRA-phase2 set-up during two additional annual cycles have been analyzed, further investigating the long-standing model-independent annual modulation effect pointed out by DAMA deep underground at the Gran Sasso National Laboratory of the I.N.F.N. by using various different experimental configurations. Including the new results, the total exposure of DAMA/LIBRA-phase2 over 8 annual cycles is 1.53 t·yr and the evidence for a signal that meets all the requirements of the model-independent Dark Matter annual modulation signature is 11.8 σ C.L. in the energy region (1 - 6) keV. In the (2 - 6) keV energy interval, where data are also available from DAMA/NaI and DAMA/LIBRA-phase1, the achieved C.L. for the full exposure of 2.86 t·yr is 13.7 σ. No systematics or side reaction able to mimic this signature (i.e., to account for the whole measured modulation amplitude and to simultaneously satisfy all the requirements of the signature) has been found or suggested by anyone throughout some decades thus far. A preliminary result on the further lowering of the software energy threshold and perspectives are also mentioned.
{"title":"Further results from DAMA/LIBRA-phase2 and perspectives","authors":"R. Bernabei, P. Belli, A. Bussolotti, V. Caracciolo, F. Cappella, R. Cerulli, C. Dai, A. d’Angelo, N. Ferrari, A. Incicchitti, A. Leoncini, X. Ma, A. Mattei, V. Merlo, F. Montecchia, X. Sheng, Z. Ye","doi":"10.15407/jnpae2021.04.329","DOIUrl":"https://doi.org/10.15407/jnpae2021.04.329","url":null,"abstract":"The data collected by the DAMA/LIBRA-phase2 set-up during two additional annual cycles have been analyzed, further investigating the long-standing model-independent annual modulation effect pointed out by DAMA deep underground at the Gran Sasso National Laboratory of the I.N.F.N. by using various different experimental configurations. Including the new results, the total exposure of DAMA/LIBRA-phase2 over 8 annual cycles is 1.53 t·yr and the evidence for a signal that meets all the requirements of the model-independent Dark Matter annual modulation signature is 11.8 σ C.L. in the energy region (1 - 6) keV. In the (2 - 6) keV energy interval, where data are also available from DAMA/NaI and DAMA/LIBRA-phase1, the achieved C.L. for the full exposure of 2.86 t·yr is 13.7 σ. No systematics or side reaction able to mimic this signature (i.e., to account for the whole measured modulation amplitude and to simultaneously satisfy all the requirements of the signature) has been found or suggested by anyone throughout some decades thus far. A preliminary result on the further lowering of the software energy threshold and perspectives are also mentioned.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2021-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86374554","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-09-25DOI: 10.15407/jnpae2021.03.259
V. I. Slisenko, O. Vasylkevych
The results of studying the dynamics of molecules of solutions of fullerene C60 in benzene and toluene are presented. The studies were carried out by the method of quasi-elastic scattering of slow neutrons. The following were determined: the total self-diffusion coefficient D, its collective Dcoll and single-particle Ds-p contributions, and molecule relaxation time τ0 before and after the dissolution of fullerene. It is necessary to pay attention to the fact that in our case a kind of neutron contrast experiment takes place. The significant difference (more than ten times) in the cross-sections for an incoherent scattering of neutrons by hydrogen and carbon nuclei made it possible to obtain diffusion parameters that characterize the dynamics of solvent molecules exclusively. It turned out that the intensity of diffusion movements of solvent molecules is almost ten times higher than the mobility of fullerene molecules.
{"title":"Еffect of fullerene C60 on the diffusion of organic solvents' molecules","authors":"V. I. Slisenko, O. Vasylkevych","doi":"10.15407/jnpae2021.03.259","DOIUrl":"https://doi.org/10.15407/jnpae2021.03.259","url":null,"abstract":"The results of studying the dynamics of molecules of solutions of fullerene C60 in benzene and toluene are presented. The studies were carried out by the method of quasi-elastic scattering of slow neutrons. The following were determined: the total self-diffusion coefficient D, its collective Dcoll and single-particle Ds-p contributions, and molecule relaxation time τ0 before and after the dissolution of fullerene. It is necessary to pay attention to the fact that in our case a kind of neutron contrast experiment takes place. The significant difference (more than ten times) in the cross-sections for an incoherent scattering of neutrons by hydrogen and carbon nuclei made it possible to obtain diffusion parameters that characterize the dynamics of solvent molecules exclusively. It turned out that the intensity of diffusion movements of solvent molecules is almost ten times higher than the mobility of fullerene molecules.","PeriodicalId":42588,"journal":{"name":"Nuclear Physics and Atomic Energy","volume":null,"pages":null},"PeriodicalIF":0.3,"publicationDate":"2021-09-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86748743","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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