EPJ Web of Conferences最新文献_第4页

miniBELEN: A modular neutron counter for (𝜶, 𝒏) reactions miniBELEN:用于(𝜶，<s:1>)反应的模块化中子计数器

EPJ Web of Conferences Pub Date : 2023-04-14 DOI: 10.1051/epjconf/202328406004

N. Mont-Geli, A. Tarifeño-Saldivia, L. Fraile, S. Viñals, A. Perea, M. Pallas, G. Cortes, E. Nácher, J. Tain, V. Alcayne, A. Algora, J. Balibrea-Correa, J. Benito, M. Borge, J. Briz, F. Calviño, D. Cano-Ott, A. de Blas, C. Domingo-Pardo, B. Fernández, R. Garcia, G. García, J. Gómez-Camacho, E. González-Romero, C. Guerrero, J. Lerendegui-Marco, M. Llanos, T. Martínez, E. Mendoza, J. Murias, S. Orrigo, A. Pérez de Rada, V. Pesudo, J. Plaza, J. Quesada, A. Sanchez, V. Sánchez-Tembleque, R. Santorelli, O. Tengblad, J. Udías, D. Villamarín

{"title":"miniBELEN: A modular neutron counter for (𝜶, 𝒏) reactions","authors":"N. Mont-Geli, A. Tarifeño-Saldivia, L. Fraile, S. Viñals, A. Perea, M. Pallas, G. Cortes, E. Nácher, J. Tain, V. Alcayne, A. Algora, J. Balibrea-Correa, J. Benito, M. Borge, J. Briz, F. Calviño, D. Cano-Ott, A. de Blas, C. Domingo-Pardo, B. Fernández, R. Garcia, G. García, J. Gómez-Camacho, E. González-Romero, C. Guerrero, J. Lerendegui-Marco, M. Llanos, T. Martínez, E. Mendoza, J. Murias, S. Orrigo, A. Pérez de Rada, V. Pesudo, J. Plaza, J. Quesada, A. Sanchez, V. Sánchez-Tembleque, R. Santorelli, O. Tengblad, J. Udías, D. Villamarín","doi":"10.1051/epjconf/202328406004","DOIUrl":"https://doi.org/10.1051/epjconf/202328406004","url":null,"abstract":"miniBELEN is a modular and transportable neutron moderated counter with a nearly flat neutron detection efficiency up to 10 MeV. Modularity implies that the moderator can be reassembled in different ways in order to obtain different types of response. The detector has been developed in the context of the Measurement of Alpha Neutron Yields (MANY) collaboration, which is a scientific effort aiming to carry out measurements of (𝛼, 𝑛) production yields, reaction cross-sections and neutron energy spectra. In this work we present and discuss several configurations of the miniBELEN detector. The experimental validation of the efficiency calculations using 252Cf sources and the measurement of the 27Al(𝛼, 𝑛) 30P reaction is also presented.","PeriodicalId":11731,"journal":{"name":"EPJ Web of Conferences","volume":"71 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-04-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86403704","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

Switchable optics based on guided mode resonance in lithographically patterned vanadium dioxide 基于光刻图案化二氧化钒导模共振的可切换光学

EPJ Web of Conferences Pub Date : 2023-04-14 DOI: 10.1051/epjconf/202226605011

M. Walther, T. Siefke, Kristin Gerold, U. Zeitner

引用次数: 1

A Study of Modified Characteristics of Hadronic Interactions 强子相互作用的修正特性研究

EPJ Web of Conferences Pub Date : 2023-03-28 DOI: 10.1051/epjconf/202328305005

J. Blažek, J. Ebr, J. Vícha, T. Pierog, P. Trávníček

{"title":"A Study of Modified Characteristics of Hadronic Interactions","authors":"J. Blažek, J. Ebr, J. Vícha, T. Pierog, P. Trávníček","doi":"10.1051/epjconf/202328305005","DOIUrl":"https://doi.org/10.1051/epjconf/202328305005","url":null,"abstract":"We have implemented ad-hoc modifications to the CORSIKA Monte-Carlo generator which allow us to simultaneously adjust the multiplicity, elasticity and cross-section of hadronic interactions with respect to the predictions of the Sibyll 2.3d interaction model, in order to assess whether a reasonable combination of changes (that is not excluded by current experimental data) could alleviate the observed tension between the model predictions and observed features of extensive air showers induced by ultra-high energy cosmic rays (UHECR). Previously, we have studied the effects of such changes on proton-initiated showers. Because a multitude of experimental data suggest that the primary composition of the UHECR is mixed, we have expanded the modification procedure to include nuclear projectiles in a consistent way based on the superposition model, in a similar manner as was used in the previous studies carried out using one-dimensional simulation methods. As we are using a fully three-dimensional approach, we can quantify the effects of the changes on both longitudinal and lateral features of the showers. With the inclusion of nuclear projectiles, we can study the impact of the changes on observable quantities for realistic primary beams as well as on the determination of the primary composition from data under the assumption of the modified hadronic interactions.","PeriodicalId":11731,"journal":{"name":"EPJ Web of Conferences","volume":"12 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82070549","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

Update on the indication of a mass-dependent anisotropy above 1018.7 eV in the hybrid data of the Pierre Auger Observatory 皮埃尔·奥格天文台混合数据中1018.7 eV以上质量相关各向异性指示的更新

EPJ Web of Conferences Pub Date : 2023-03-28 DOI: 10.1051/epjconf/202328303003

E. Mayotte, T. Fitoussi

{"title":"Update on the indication of a mass-dependent anisotropy above 1018.7 eV in the hybrid data of the Pierre Auger Observatory","authors":"E. Mayotte, T. Fitoussi","doi":"10.1051/epjconf/202328303003","DOIUrl":"https://doi.org/10.1051/epjconf/202328303003","url":null,"abstract":"We test for an anisotropy in the mass of arriving cosmic-ray primaries associated with the galactic plane. The sensitivity to primary mass is obtained through the depth of shower maximum, X max, extracted from hybrid events measured over a 14-year period at the Pierre Auger Observatory. The sky is split into distinct on-and off-plane regions using the galactic latitude of each arriving cosmic ray to form two distributions of X max, which are compared using an Anderson-Darling 2-samples test. A scan over roughly half of the data is used to select a lower threshold energy of 1018.7 eV and a galactic latitude splitting at |b| = 30°, which are set as a prescription for the remaining data. With these thresholds, the distribution of X max from the on-plane region is found to have a 9.1±1.6−2.2+2.1g/cm2 shallower mean and a 5.9±2.1−2.5+3.5g/cm2 narrower width than that of the off-plane region and is observed in all telescope sites independently. These di↵erences indicate that the mean mass of primary particles arriving from the on-plane region is greater than that of those from the off-plane region. Monte Carlo studies yield a 5.9 ×10−6 random chance probability for the result in the independent data, lowering to a 6.0 × 10−7 post-penalization random chance probability when the scanned data is included. Accounting for systematic uncertainties leads to an indication for anisotropy in mass composition above 1018.7 eV with a 3.3 σ-significance. Furthermore, the result has been newly tested using additional FD data recovered from the selection process. This test independently disfavors the on-and off-plane regions being uniform in composition at the 2.2 σ-level, which is in good agreement with the expected sensitivity of the dataset used for this test.","PeriodicalId":11731,"journal":{"name":"EPJ Web of Conferences","volume":"6 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79495644","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: 2

Testing Model Predictions of Depth of Air-Shower Maximum and Signals in Surface Detectors using Hybrid Data of the Pierre Auger Observatory 利用皮埃尔·奥格天文台的混合数据测试气淋最大深度和地表探测器信号的模型预测

EPJ Web of Conferences Pub Date : 2023-03-26 DOI: 10.1051/epjconf/202328302012

J. V'icha

{"title":"Testing Model Predictions of Depth of Air-Shower Maximum and Signals in Surface Detectors using Hybrid Data of the Pierre Auger Observatory","authors":"J. V'icha","doi":"10.1051/epjconf/202328302012","DOIUrl":"https://doi.org/10.1051/epjconf/202328302012","url":null,"abstract":"We present a method for testing the predictions of hadronic interaction models and improving their consistency with observed two-dimensional distributions of the depth of shower maximum, X max, and signal at the ground level as a function of zenith angle. The method relies on the assumption that the mass composition is the same at all zenith angles, while the atmospheric shower development and attenuation depend on composition in a correlated way. In the present work, for each of the three leading LHC-tuned hadronic interaction models, we allow a global shift ∆ X max of the predicted shower maximum, which is the same for every mass and energy, and a rescaling R Had of the hadronic component at the ground level which is constant with the zenith angle. We apply the analysis to 2297 events reconstructed with both the fluorescence and surface detectors of the Pierre Auger Observatory with energies 1018.5−19.0 eV and zenith angles below 60°. Given the modeling assumptions made in this analysis, the best fit reaches its optimum value when shifting the X max predictions of hadronic interaction models to deeper values and increasing the hadronic signal. This change in the predicted X max scale alleviates the previously identified model deficit in the hadronic signal (commonly called the muon puzzle) but does not fully remove it. Because of the size of the adjustments ∆ X max and R Had and the large number of events in the sample, the statistical significance of need for these adjustments is large, greater than 5σstat, even for the combination of the systematic experimental shifts within 1σsys that are the most favorable for the models.","PeriodicalId":11731,"journal":{"name":"EPJ Web of Conferences","volume":"36 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83805169","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

Convolutional neural network optimisation to enhance ESPI fringe visibility 卷积神经网络优化，提高ESPI条纹可见性

EPJ Web of Conferences Pub Date : 2023-03-24 DOI: 10.1051/epjconf/202226613007

J. M. Crespo, V. Moreno

引用次数: 1

β-decay spectroscopy of neutron-deficient nuclei 中子亏缺核的β衰变谱

EPJ Web of Conferences Pub Date : 2023-03-22 DOI: 10.1051/epjconf/202327912002

S. Orrigo, B. Rubio, W. Gelletly

引用次数: 0

New perspectives for neutron capture measurements in the upgraded CERN-n_TOF Facility 升级后的CERN-n_TOF装置中子捕获测量的新视角

EPJ Web of Conferences Pub Date : 2023-03-15 DOI: 10.1051/epjconf/202328401028

J. Lerendegui-Marco, A. Casanovas, V. Alcayne, The nTOF Collaboration

引用次数: 5

New detection systems for an enhanced sensitivity in key stellar (n,γ) measurements 新的探测系统提高了关键恒星(n，γ)测量的灵敏度

EPJ Web of Conferences Pub Date : 2023-03-15 DOI: 10.1051/epjconf/202327913001

J. Lerendegui-Marco, V. Babiano-Su'arez, J. Balibrea-Correa, C. Domingo-Pardo, I. Ladarescu, A. Tarifeño-Saldivia, V. Alcayne, D. Cano-Ott, E. Gonz'alez-Romero, T. Mart'inez, E. Mendoza, C. Guerrero, F. Calviño, A. Casanovas, U. Koster, N. Chiera, R. Dressler, E. Maugeri, D. Schumann, The nTOF Collaboration

{"title":"New detection systems for an enhanced sensitivity in key stellar (n,γ) measurements","authors":"J. Lerendegui-Marco, V. Babiano-Su'arez, J. Balibrea-Correa, C. Domingo-Pardo, I. Ladarescu, A. Tarifeño-Saldivia, V. Alcayne, D. Cano-Ott, E. Gonz'alez-Romero, T. Mart'inez, E. Mendoza, C. Guerrero, F. Calviño, A. Casanovas, U. Koster, N. Chiera, R. Dressler, E. Maugeri, D. Schumann, The nTOF Collaboration","doi":"10.1051/epjconf/202327913001","DOIUrl":"https://doi.org/10.1051/epjconf/202327913001","url":null,"abstract":"Neutron capture cross-section measurements are fundamental in the study of astrophysical phenomena, such as the slow neutron capture (s-) process of nucleosynthesis operating in red-giant and massive stars. However, neutron capture measurements via the time-of-flight (TOF) technique on key s-process nuclei are often challenging. Difficulties arise from the limited mass (∼mg) available and the high sample-related background in the case of the unstable s-process branching points. Measurements on neutron magic nuclei, that act as s-process bottlenecks, are affected by low (n,γ) cross sections and a dominant neutron scattering background. Overcoming these experimental challenges requires the combination of facilities with high instantaneous flux, such as n_TOFEAR2, with detection systems with an enhanced detection sensitivity and high counting rate capabilities. This contribution reviews some of the latest detector developments in detection systems for (n,γ) measurements at n_TOF, such as i-TED, an innovative detection system which exploits the Compton imaging technique to reduce the dominant neutron scattering background and s-TED, a highly segmented total energy detector intended for high flux facilities. The discussion will be illustrated with results of the first measurement of key the s-process branching-point reaction 79Se(n,γ).","PeriodicalId":11731,"journal":{"name":"EPJ Web of Conferences","volume":"30 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81801857","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: 3

UHECR Signatures and Sources UHECR签名和来源

EPJ Web of Conferences Pub Date : 2023-03-15 DOI: 10.1051/epjconf/202328304010

D. Fargion, P. G. De Sanctis Lucentini, M. Khlopov

{"title":"UHECR Signatures and Sources","authors":"D. Fargion, P. G. De Sanctis Lucentini, M. Khlopov","doi":"10.1051/epjconf/202328304010","DOIUrl":"https://doi.org/10.1051/epjconf/202328304010","url":null,"abstract":"We discuss recent results on the clustering, composition and distribution of Ultra-High Energy Cosmic Rays (UHECR) in the sky; from the energy of several tens of EeV in the dipole anisotropy, up to the highest energy of a few narrow clusters, those of Hot Spots. Following the early UHECR composition records deviations from proton we noted that the UHECR events above 40 EeV can be made not just by any light or heavy nuclei, but mainly by the lightest ones as He,D, Li,Be. The remarkable Virgo absence and the few localized nearby extragalactic sources, such as CenA, NGC 253 and M82, are naturally understood: lightest UHECR nuclei cannot reach us from the Virgo distance of twenty Mpc, due to their nuclei fragility above a few Mpc distances. Their deflection and smearing in wide hot spots is better tuned to the lighter nuclei than to the preferred proton or heavy nuclei candidate courier. We note that these lightest nuclei still suffer of a partial photodistruction even from such close sources. Therefore, their distruption in fragments, within few tens EeV multiplet chain of events, have been expected and later on observed by Auger collaboration, nearly a decade ago. These multiplet presences, strongly correlate with the same CenA, NGC253 sources. The statistical weight of such correlation is reminded. We conclude that the same role of NGC 253 clustering at lower energies could also feed the Auger dipole anisotropy at lower energy ranges. Such lower energy anisotropy could be fed and integrated by nearest Vela, Crab, LMC and Cas A contributes. In our present UHECR model, based on lightest nuclei in local volumes of a few Mpcs, closest AGN, Star-Burst or very close SNR are superimposing their signals, frozen in different epochs, distances and directions, feeding small and wide anisotropy. Possible tests to confirm, or untangle the current model from alternative ones, are suggested and updated.","PeriodicalId":11731,"journal":{"name":"EPJ Web of Conferences","volume":"156 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2023-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73731721","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