HNPS Proceedings最新文献

Exploring the astrophysical conditions for the creation of the first r-process peak, and the impact of nuclear physics uncertainties 探索产生第一个r过程峰的天体物理条件，以及核物理不确定性的影响

HNPS Proceedings Pub Date : 2020-04-17 DOI: 10.12681/hnps.3015

S. Nikas, G. Martínez-Pinedo, M. R. Wu, A. Sieverding, M. P. Reiter

引用次数: 1

Isomeric Cross Section Study of Neutron Induced Reactions on Ge Isotopes 中子诱导 Ge 同位素反应的异构体截面研究

HNPS Proceedings Pub Date : 2020-04-17 DOI: 10.12681/hnps.2997

R. Vlastou, A. Kalamara, G. Gkatis, A. Stamatopoulos, S. Chasapoglou, M. Kokkoris, M. Axiotis, A. Lagoyannis, I. Stamatelatos

引用次数: 2

MottCalc: A new tool for calculating Mott scattering differential cross sections for analytical purposes MottCalc：为分析目的计算莫特散射微分截面的新工具

HNPS Proceedings Pub Date : 2020-04-17 DOI: 10.12681/hnps.2986

F. Maragkos, M. Kokkoris, A. Lagogiannis

{"title":"MottCalc: A new tool for calculating Mott scattering differential cross sections for analytical purposes","authors":"F. Maragkos, M. Kokkoris, A. Lagogiannis","doi":"10.12681/hnps.2986","DOIUrl":"https://doi.org/10.12681/hnps.2986","url":null,"abstract":"In the last few years, the popularity of ERDA applications has soared along with the implementation of time of flight (TOF) type measurements. However, ERDA and other forward scattering IBA techniques suffer from the possibility of the occurence of Mott scattering. This leads to deviations in the elastic differential cross sections which in turn demand special care in the treatment of the obtained experimental spectra. To address this issue, a new code has been developed, called MottCalc (Mott Calculator). Based on the analytical formula, first developed by Mott, which describes the phenomenon, the code is capable of producing theoretical angular and energy distributions of such differential cross sections along with the appropriate R33 files, which in turn can be implemented in all the widely used analytical codes (SIMNRA, DF, POTKU etc.). The electronic screening effect is taken into account in these calculations by implementing the Andersen model. A list of 314 different isotopes is available to choose from as projectile and target nuclei. The list can be expanded with radioactive isotopes. The program is available in two distinct versions, an Excel Spreadsheet and a stand-alone application. Both versions of the program can be freely downloaded from the webpage of the Nuclear Physics group of NTUA (nuclearphysics.ntua.gr/downloads.php). The implementation of the code as well as the features and capabilities of both versions of the program are presented in the current work along with a brief synopsis of the elastic Mott scattering phenomenon.","PeriodicalId":148854,"journal":{"name":"HNPS Proceedings","volume":"32 50","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141211175","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 the 234U(n,f) cross section in the energy range between 14.8 and 17.8 MeV using Micromegas detectors 在14.8 - 17.8 MeV的能量范围内用Micromegas探测器测量234U(n,f)截面

HNPS Proceedings Pub Date : 2020-04-17 DOI: 10.12681/hnps.2675

A. Kalamara, S. Chasapogloou, V. Michalopoulou, A. Stamatopoulos, Z. Eleme, M. Kokkoris, A. Lagoyannis, N. Patronis, R. Vlastou

{"title":"Measurement of the 234U(n,f) cross section in the energy range between 14.8 and 17.8 MeV using Micromegas detectors","authors":"A. Kalamara, S. Chasapogloou, V. Michalopoulou, A. Stamatopoulos, Z. Eleme, M. Kokkoris, A. Lagoyannis, N. Patronis, R. Vlastou","doi":"10.12681/hnps.2675","DOIUrl":"https://doi.org/10.12681/hnps.2675","url":null,"abstract":"Neutron induced fission cross sections of actinides present special interest, since they lead to the design optimization of new generation reactors (Generation IV) as well as Accelerator Driven Systems (ADS). In the present work, the 234U(n,f) cross section was measured for which only a few available discrepant data exist in literature leading to poor evaluations. More specifically, four irradiations were performed at the 5.5 MV Tandem Accelerator Laboratory of NCSR “Demokritos” using quasi-monoenergetic neutrons produced by the 3H(d,n)4He reaction in the 14.8-19.2 MeV energy range. The 234U(n,f) cross section was measured relatively to the 235U(n,f) and 238U(n,f) reference ones and in order to perform the in-beam measurements for each of the actinide targets (234U, 238U, 235U), a Micromegas detector was used to record the fission fragments. The target-detector pairs were placed in an Al chamber filled with a Ar:CO2 (in 80:20 volume fraction) gas mixture at atmospheric pressure and temperature. The efficiency of the Micromegas detectors was estimated by Monte-Carlo simulations using the GEF and FLUKA codes. In addition, a detailed study of the neutron energy spectra was carried out by coupling both NeuSDesc and MCNP5 codes in order to take into account and correct for the contribution of low energy parasitic neutrons in the fission yields.","PeriodicalId":148854,"journal":{"name":"HNPS Proceedings","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115774131","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

Nuclear Symmetry Energy Effects on the Bulk Properties of Neutron-rich Finite Nuclei 核对称能对富中子有限核体性质的影响

HNPS Proceedings Pub Date : 2020-04-17 DOI: 10.12681/hnps.2992

M. Divaris, C. Moustakidis

引用次数: 0

Cross section measurement of 241Am(n,f) reaction at the Experimental Area 2 of the n_TOF facility at CERN: First Results 欧洲核子研究中心 n_TOF 设备 2 号实验区的 241Am(n,f)反应截面测量：初步结果

HNPS Proceedings Pub Date : 2020-04-17 DOI: 10.12681/hnps.3008

Z. Eleme

{"title":"Cross section measurement of 241Am(n,f) reaction at the Experimental Area 2 of the n_TOF facility at CERN: First Results","authors":"Z. Eleme","doi":"10.12681/hnps.3008","DOIUrl":"https://doi.org/10.12681/hnps.3008","url":null,"abstract":"The condition for the safe design and operation of fast neutron reactors and energy boosters (Generation-IV reactors, ADS systems [1]) is the accuracy of nuclear data. The 241Am isotope (T1/2 = 433 years) is highly present in nuclear waste, accounting for about 1.8% of the actinide mass in PWR UOx nuclear reactors’ waste [2]. In addition, the 241Am isotope is further produced by the β decay of the 241Pu isotope (T1/2 = 14.3 years). Given the high production rate of 241Am isotope, its incineration with concurrent energy production is considered to be of utmost importance for the design and implementation of the recycling of existing nuclear waste. Sensitivity studies of the proposed systems for energy production showed that high-precision measurements of the cross section of the 241Am(n,f) reaction are required. In the present work, the 241Am(n,f) reaction cross section was measured in the Second Experimental Area of the n_TOF facility at CERN, using an array of Micromegas detectors. For the measurement, six targets of 241Am with average activity of 17 MBq per sample were coupled with an equal number of detectors in a common chamber. Additionally two 235U and two 238U samples were coupled with Micromegas detectors utilizing the neutron flux determination. Within this work, an overview of the experimental set-up and the adopted data analysis technique is presented along with preliminary results.","PeriodicalId":148854,"journal":{"name":"HNPS Proceedings","volume":"34 7","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-04-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141211354","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

Production Cross–Section Calculations of 62Cu via Charged Particles Induced Reactions 带电粒子诱导反应制备62Cu的截面计算

HNPS Proceedings Pub Date : 2020-04-17 DOI: 10.12681/hnps.2476

M. Şekerci, H. Özdoğan

引用次数: 0

Radioactive Contamination due to 241Am Lightning Rod Failure 上午24:1避雷针失效造成的放射性污染

HNPS Proceedings Pub Date : 2020-02-20 DOI: 10.12681/HNPS.2976

K. Karfopoulos, G. Papadakos, D. Karangelos, P. Rouni, N. Petropoulos, M. Anagnostakis, E. Hinis, S. Simopoulos

{"title":"Radioactive Contamination due to 241Am Lightning Rod Failure","authors":"K. Karfopoulos, G. Papadakos, D. Karangelos, P. Rouni, N. Petropoulos, M. Anagnostakis, E. Hinis, S. Simopoulos","doi":"10.12681/HNPS.2976","DOIUrl":"https://doi.org/10.12681/HNPS.2976","url":null,"abstract":"It is estimated that until 1978 about 200000 lightning conductor rods with -a emitting sources attached to their end were installed worldwide. The sources were supposed to increase the lighting collection efficiency of these rods through the ionization of the surrounding air. Nevertheless, this improvement has never been established conclusively. Such devices are, in most cases, not accessible by the pub- lic; therefore, the dose to the population is considered insignificant. However, the possibility of radioactive material leakage, due to the source attachment failure, and the subsequent contamination of the surroundings that could lead to possible health risk of the public cannot be excluded. In this work, the case of 241Am contamination due to a lightning rod conductor failure is investigated. This contamination was accidentally detected on the surface soil around a laboratory building in the National Technical University of Athens Campus, during a routine in-situ gamma-ray measurement campaign that took place in 2003. A detailed survey revealed that this 241Am contamination was due to the leakage from two lightning rods on the building roof. Consequently the rods were removed from the building and the contamination pattern on the roof and on the surface soil around the building was examined in detail. From the results obtained so far it may be concluded that there exists well localized contamination on the roof and also around the building. It was established that the pathway through which contamination reached the ground was the rainwater drainage system of the building. The gamma ray dose rate due to 241Am contamination found on the roof and on the surface soil is low compared to that due to its natural radioactivity and does not seem to pose any health risk to the people working in the building or to the public.","PeriodicalId":148854,"journal":{"name":"HNPS Proceedings","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-02-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116638063","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

Editorial Comments and Symposium Info 编辑意见和研讨会信息

HNPS Proceedings Pub Date : 2020-02-20 DOI: 10.12681/hnps.2945

/. Editorial Team

引用次数: 0

Is "friction" responsible for the reduction of fusion rates far below the Coulomb barrier? “摩擦”是导致聚变速率远低于库仑势垒的原因吗?

HNPS Proceedings Pub Date : 2020-02-20 DOI: 10.12681/hnps.2954

S. Karataglidis, K. Amos, B. Giraud, B. Robson

引用次数: 0