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Theoretical modelling of Heavy Ion Double Charge Exchange reactions and calculations for the NUMEN project
Get PDFDouble Charge Exchange nuclear reactions induced by Heavy Ions (HIDCE) are discussed, focusing on the scenario where these processes are described as two-step direct reactions and, in particular, as an incoherent sequence of two
single charge exchange reactions (Double Single Charge Exchange, DSCE). HIDCE reactions share fundamental characteristics, such as the spin-isospin transition
operator, with the elusive neutrinoless double beta decay. Hence, the study of this kind of reactions could allow to get information on the Nuclear Matrix Element (NME) involved in double beta decay rate. Second order DWBA allows to describe Heavy Ion DSCE reaction amplitude in terms of distortion factors, storing information on initial and final state ion-ion elastic interactions, and nuclear matrix elements. The latter are determined within QRPA theory. The formalism adopted to describe DSCE transition form factors is discussed, focusing on the approximations allowing to get disentangled projectile and target NMEs within DSCE cross section expression. Results are shown for the DCE reactions 40Ca (18O, 18Negs) 40Args, 76Se (18O, 18Negs) 76Gegs and 76Ge(20Ne,20Ogs)76Segs, studied within the NUMEN
collaboration with a beam energy of 15.3 AMeV
Energy reconstruction with machine learning techniques in JUNO
Get PDFThe Jiangmen Underground Neutrino Observatory (JUNO) is a
multipurpose liquid scintillator neutrino experiment under construction located in China. Although the main source of neutrinos in JUNO is two nuclear power plants located about 52.5 km away from the experiment, it will also be able to study solar and atmospheric neutrinos, geoneutrinos and neutrinos coming from supernovae. The determination of the neutrino mass ordering (NMO) with 3-4σ in 6 years is the main goal of the experiment. Moreover, another JUNO’s important aim is to measure neutrino oscillation parameters sin2 θ12,Δm2 21,Δm2 31 with sub-percent precision. The central detector of JUNO is an acrylic sphere filled with 20 kt of liquid-scintillator (LS) surrounded by 17612 20-inch photomultiplier tubes (PMTs) and 25600 3-inch PMTs, providing ∼78% coverage of the detector sphere. Thanks to the almost complete coverage of the sphere by the PMTs array, as well as high light yield leads to an unprecedented, for LS-based experiments, energy resolution
of 3% at 1 MeV. Due to the need to take into account various effects, including the non-linearity of the energy response and the detector’s spatial non-uniformity, event energy reconstruction is not a straightforward task. In this study, energy reconstruction for reactor neutrino events with machine learning (ML) techniques is presented. The following two models are used: Boosted Decision Trees and Fully
Connected Deep Neural Network. The models are trained on aggregated features extracted from charge and time information on PMTs
Archaeological data management and spatial analysis tools in the study of necropolises: case studies from Bologna and Spina (6th-3rd cent. BC)
Get PDFThis contribution deals with the use of relational databases (RDB) and GIS for the spatial analysis of Iron Age funerary contexts in the Italian peninsula through two projects by the Chair of Etruscology at the University of Bologna. The two selected case studies of Bologna's western necropolis and Spina's Valle Trebba necropolis represent distinct phases of research and discuss the challenges in updating historic systems and creating dialogue between systems adopted at different times. The Bologna case provides the opportunity to discuss the quality of data from old excavations in reconstructing funerary landscapes using GIS. The case of Valle Trebba exemplifies the difficulties in planning and managing information on 1215 tombs and over twelve thousand objects through an articulated relational archiving system. The iconography of Attic pottery allows us to understand the management of qualitative data. As far as spatial analysis in a GIS environment is concerned, we reassessed the solutions adopted for the Valle Trebba project, which are currently unsatisfactory, as they do not meet the principles of accessibility of such tools, nor Open Data Standards
A discussion of the cross section ν¯e+p→e++n
Get PDFWe discuss the interaction cross section ¯ νe − p due to charged currents, of major importance for neutrino detection. We present the history of its understanding and highlight the aspects necessary for its precise evaluation. We examine the three most recent determinations and, on the basis of the most recent one, tabulate its updated values and assess its uncertainty
Premesse e prospettive di un workshop
Get PDFIntroduction to Atti del workshop Necropoli etrusco-italiche: archeologia digitale e paesaggio funerari
Data management and reconstruction of funerary landscape in pre-Roman necropolises between Este and Padova
Get PDFThe results of two distinct projects on two pre-Roman funerary areas are presented: the eastern necropolis of Padova between via Tiepolo and via S. Massimo (excavations 1990-1991), and the northern necropolis of Este in the area of Casa di Ricovero (excavations 1983-1993). The first project focused on building of a geodatabase to manage and archive documentation data, as well as to consciously plan resources allocation and research steps. The second project, on the other hand, focused on 3D reconstructions of two burial mounds in a BIM environment, with both research and dissemination aims. Therefore, it was possible to experiment with the limits, potential, and effectiveness of this method in an unusual archaeological context, characterised by monuments built mainly with perishable materials and lacking architectural structures
Le Digital Muret, une édition numérique enrichie d’un recueil de dessins d’objets archéologiques du XIXe siècle
Get PDFA collection of unpublished drawings by Jean-Baptiste Muret (1795-1866), kept at the Bibliothèque nationale de France (Paris), brings together in colour plates the drawings of almost 8,000 ancient objects, drawn according to the knowledge of his time. It is a precious and original testimony to the birth of archaeology as a science, and still has great heuristic potential today. The recent digital publication of this work allows us both to contribute to the history of the discipline and to give today’s researchers access to a wealth of documentation that is still useful for current studies. The presentation of the results of this research project will provide an opportunity to outline a proposed model for the digital publication of enriched historical sources, in accordance with the principles of open science and adapted to the specific needs of research in terms of scientific integrity
Latest results from the NA62 experiment at CERN: Precision measurements and searches in beam-dump mode
Get PDFThe NA62 experiment at CERN is designed to study the physics of the K+ meson. After collecting data in 2016, 2017, and 2018, the experiment has resumed data taking in 2021 and has received approval for operations until the onset of long shutdown 3. The latest result from the NA62 experiment are presented with a focus on the studies performed in the framework of the Chiral Perturbation Theory and searches for production and decay of dark photons in beam-dump mode
Trigger studies for the search of Higgs boson pair production in the ATLAS experiment
Get PDFThe estimation of the Higgs boson self-coupling is possible at the Large-Hadron Collider studying di-Higgs events. The full Run 2 data-taking period reached an integrated luminosity of 140 fb−1, that is expected to at least double at the end of the ongoing Run 3 of the LHC, but given the small di-Higgs produc- tion cross-section, much higher data statistics is expected to be needed to observe this process from the simple extrapolation of the current results. For this reason, improvements in the signal acceptance and efficiency, starting from improvements in the trigger selections, are crucial to reduce the amount of data needed for this measurement. The preliminary results of an ongoing study to find the best trade- off between acceptance in the bbττ channel and the total trigger rate, at both the Level-1 and High Level triggers of the ATLAS experiment will be presented. In particular the latest results of the optimization, and its possible future upgrades, will be discussed as part of the ATLAS global effort to increase the sensitivity to the Higgs boson self-coupling measurements
