HNPS Advances in Nuclear Physics最新文献

Measuring radon concentrations in air at the progeny non-secular equilibrium time frame 在子代非长期平衡时间范围内测量空气中的氡浓度

HNPS Advances in Nuclear Physics Pub Date : 2023-05-05 DOI: 10.12681/hnpsanp.5131

N. Petropoulos, Sotia Argyrou

{"title":"Measuring radon concentrations in air at the progeny non-secular equilibrium time frame","authors":"N. Petropoulos, Sotia Argyrou","doi":"10.12681/hnpsanp.5131","DOIUrl":"https://doi.org/10.12681/hnpsanp.5131","url":null,"abstract":"The Nuclear Engineering Laboratory of NTUA (NEL-NTUA) regularly tests radon-in-air concentration measuring instruments. Most common instruments involve open ionization chambers, radon absorbing devices and grab sampling devices. Most types of such instruments do not provide a calibrated radon concentration as soon as the air sampling has ended, since there should exist an adequate time gap, within which sampled radon would reach secular equilibrium with some or most of its immediate progeny. This gap should be around 10-20 min for radon to equilibrate with the Po-218 nucleus, or it could be more than about 3 hours for radon to equilibrate with the Bi-214 / Po-214 progeny. However, if there could be organized calibration experiments at the progeny non-secular equilibrium state, there are some instrument cases, for which this time gap difficulty may be better understood and overcome. To this end, in this work, the Bateman differential equations for all gamma and alpha emitting radon daughters are solved for radon daughters activity at any given time between 0 min and 3 hours using a spreadsheet. This would allow for obtaining a calibration correction factor to be applied at any given time before equilibrium, resulting for radon concentration estimations without the limitations of waiting. Following this solution, the results were theoretically assessed in terms of applicability. Calibration experiments performed for ionization chambers, radon absorbents and Lucas Cells at various radon concentrations in air at the progeny non-secular equilibrium time frame corroborate the theoretical approach.","PeriodicalId":262803,"journal":{"name":"HNPS Advances in Nuclear Physics","volume":"115 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117343780","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}

引用次数: 0

First results from the 63Cu(α,γ)67Ga reaction study for nuclear astrophysics purposes 核子天体物理学研究63Cu(α，γ)67Ga反应的第一个结果

HNPS Advances in Nuclear Physics Pub Date : 2023-05-05 DOI: 10.12681/hnpsanp.5091

M. Peoviti, N. Patronis, M. Axiotis, V. Foteinou, D. Rogalla, Fotios Maragkos, S. Harissopulos

引用次数: 0

A study of proton-induced reactions on natural Silicon targets 天然硅靶上质子诱导反应的研究

HNPS Advances in Nuclear Physics Pub Date : 2023-05-05 DOI: 10.12681/hnpsanp.5086

N. Nicolis, Georgia Zafeiri

引用次数: 0

Microscopic analysis of octupole shape phase transitions and critical points in neutron rich actinides 富中子锕系元素八极形相变和临界点的显微分析

HNPS Advances in Nuclear Physics Pub Date : 2023-05-05 DOI: 10.12681/hnpsanp.5132

Vaia Prassa

引用次数: 0

Semiconductor Detector Study for Detecting Fusion Neutrons using Geant4 Simulations 利用Geant4模拟研究用于探测聚变中子的半导体探测器

HNPS Advances in Nuclear Physics Pub Date : 2023-05-05 DOI: 10.12681/hnpsanp.5184

K. Kaperoni, M. Diakaki, M. Kokkoris, M. Axiotis, A. Ziagkova, C. Weiss, R. Vlastou

{"title":"Semiconductor Detector Study for Detecting Fusion Neutrons using Geant4 Simulations","authors":"K. Kaperoni, M. Diakaki, M. Kokkoris, M. Axiotis, A. Ziagkova, C. Weiss, R. Vlastou","doi":"10.12681/hnpsanp.5184","DOIUrl":"https://doi.org/10.12681/hnpsanp.5184","url":null,"abstract":"Accurate neutron flux measurements in fusion reactors are essential, in order to determine the feasibility and progress of the reaction as well as for safety issues. Semiconductor neutron detectors exhibit promising characteristics for operation in the extreme environmental conditions of fusion reactors. Silicon, Diamond and Silicon Carbide are the most studied and anticipated materials for constructing detectors with high efficiency and irradiation resistance. The ITER fusion reactor is expected to run D-D plasma measurements in the near future, so the detection of 2.45 MeV neutrons with appropriate detectors is of great and immediate importance. In the present work the study of 2.45 MeV neutrons interactions with a silicon, diamond and silicon carbide detector was made, using GEANT4 [1] simulations, in order to compare their response. An experimental study will follow at the neutron production facility of the TANDEM accelerator of the I.N.P.P. of the NCSR “Demokritos”, with detectors provided by CIVIDEC Instrumentation GmbH, so the geometry of the simulations was built accordingly. A quasi-monoenergetic neutron beam of 2.45 MeV was produced through 3H(p,n) reactions in a TiT target. Due to the low cross section of the reaction, biasing techniques were implemented in the simulation to increase the counting rate and thus producing realistic results. These biasing techniques were studied, with various tests and the parameters affecting the choice of the biasing factor are shown and discussed.","PeriodicalId":262803,"journal":{"name":"HNPS Advances in Nuclear Physics","volume":"148 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129105105","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}

引用次数: 0

Radioactivity measurements in eastern Lesvos, Greece 希腊莱斯沃斯岛东部的放射性测量

HNPS Advances in Nuclear Physics Pub Date : 2023-05-05 DOI: 10.12681/hnpsanp.5136

F. Pappa

{"title":"Radioactivity measurements in eastern Lesvos, Greece","authors":"F. Pappa","doi":"10.12681/hnpsanp.5136","DOIUrl":"https://doi.org/10.12681/hnpsanp.5136","url":null,"abstract":"The radioactive background of the eastern side of Lesvos Island in Greece, an island rich in natural radioactivity, was studied by means of gamma ray spectroscopy. Dose rates and concentrations of natural radionuclides (232Th series, 226Ra and 40K) and 137Cs were measured in-situ and in the laboratory, respectively. A total of twenty soil samples and ten beach sand samples was collected and processed according to the IAEA protocol. For the in-situ measurement and the dose rate determination a portable NaI scintillation detector was utilized. The activity concentration calculations were held in the laboratory, using a high-purity germanium detector. These activity concentrations were also used to estimate dose rates, so as to compare the obtained results with the in-situ measurements. The maximum detected values of activity concentrations of 232Th series, 226Ra, 40K and 137Cs were found to be 190, 90, 960 and 70 Bq kg-1, respectively. As for the dose rates, both measured and estimated, the maximum values were 230 and 190 nGy h-1, respectively. A significant difference regarding activity concentrations and dose rates was observed between the two matrices (soil, beach sand), with the values of soil samples quite surpassing those of beach sand samples. That can be attributed to the granulometry of each matrix. Furthermore, the study attempts to compare the radioactive background between the eastern and the western side of Lesvos Island, with the larger values being found in the eastern part.","PeriodicalId":262803,"journal":{"name":"HNPS Advances in Nuclear Physics","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114113781","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}

引用次数: 1

Measurement of differential cross sections for proton elastic scattering on natO at Ep= 4-6 MeV, suitable for EBS 质子弹性散射在Ep= 4-6 MeV的北约上的微分截面测量，适用于EBS

HNPS Advances in Nuclear Physics Pub Date : 2023-05-05 DOI: 10.12681/hnpsanp.5183

M. Kokkoris, Kostas Bosbotinis, V. Foteinou, A. Lagoyannis, F. Maragkos, N. Patronis, E. Taimpiri, A. Ziagkova

引用次数: 0

Activation Cross Section Measurement of the (n,2n) Reaction on 203Tl at 16.4 MeV, 18.9 MeV and Theoretical Calculations via the EMPIRE code 203Tl在16.4 MeV, 18.9 MeV下(n,2n)反应的活化截面测量及EMPIRE码理论计算

HNPS Advances in Nuclear Physics Pub Date : 2023-05-05 DOI: 10.12681/hnpsanp.5154

Stavros Patas, Sotiris Chasapoglou, Michalis Axiotis, Maria Diakaki, George Gkatis, Sotirios Harissopulos, Michael Kokkoris, Anastasios Lagoyannis, Eleni Tsivouraki, Roza Vlastou

引用次数: 0

Chernobyl and Fukushima nuclear accidents: similarities and differences 切尔诺贝利和福岛核事故:异同

HNPS Advances in Nuclear Physics Pub Date : 2023-05-05 DOI: 10.12681/hnpsanp.5094

John Kalef Ezra

引用次数: 0

Recent Progress in the Study of the Reaction 70Zn (15 MeV/nucleon) + 64Ni with the MAGNEX Spectrometer 70Zn (15mev /核子)+ 64Ni反应的磁谱仪研究进展

HNPS Advances in Nuclear Physics Pub Date : 2023-05-05 DOI: 10.12681/hnpsanp.5090

S. Koulouris, G. Souliotis, F. Cappuzzello, D. Carbone, A. Pakou, C. Agodi, G. Brischetto, M. Cavallaro, S. Calabrese, I. Ciraldo, O. Fasoula, J. Klimo, Konstantina Palli, O. Sgouros, V. Soukeras, A. Spatafora, D. Torresi, M. Veselský

{"title":"Recent Progress in the Study of the Reaction 70Zn (15 MeV/nucleon) + 64Ni with the MAGNEX Spectrometer","authors":"S. Koulouris, G. Souliotis, F. Cappuzzello, D. Carbone, A. Pakou, C. Agodi, G. Brischetto, M. Cavallaro, S. Calabrese, I. Ciraldo, O. Fasoula, J. Klimo, Konstantina Palli, O. Sgouros, V. Soukeras, A. Spatafora, D. Torresi, M. Veselský","doi":"10.12681/hnpsanp.5090","DOIUrl":"https://doi.org/10.12681/hnpsanp.5090","url":null,"abstract":"The present paper is focused on our recent efforts to study the production and identification of neutron-rich medium-mass rare isotopes from peripheral reactions at beam energies around and below the Fermi energy. We obtained high-quality experimental data from a recent experiment with the MAGNEX spectrometer at the INFN-LNS in Catania, Italy. The main aim of this experiment was to check the feasibility of ejectile identification in this energy regime with the use of a large acceptance magnetic spectrometer. Our developed technique for particle identification depends mainly on a reconstruction of both the atomic number Z and the ionic charge q of the ions, followed by the identification of the mass. Our method was successfully applied to identify neutron-rich ejectiles from multinucleon transfer from the reaction of 70Zn (15 MeV/nucleon) + 64Ni. Preliminary results indicate that the extracted experimental distributions, along with comparisons with the theoretical models could help us to shed light to the complex reaction mechanism of multinucleon transfer in this energy regime.","PeriodicalId":262803,"journal":{"name":"HNPS Advances in Nuclear Physics","volume":"59 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-05-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132214179","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}

引用次数: 0