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Your search keyword '"Lidio Pietrofaccia"' showing total 2 results
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2 results on '"Lidio Pietrofaccia"'

1. Solar Neutrinos Spectroscopy with Borexino Phase-II

Author

Lino Miramonti, Matteo Agostini, Konrad Altenmueller, Simon Appel, Victor Atroshchenko, Zara Bagdasarian, Davide Basilico, Gianpaolo Bellini, Jay Benziger, Daniel Bick, Irene Bolognino, Giuseppe Bonfini, David Bravo, Barbara Caccianiga, Frank Calaprice, Alessio Caminata, Silvia Caprioli, Marco Carlini, Paolo Cavalcante, Francesca Cavanna, Alexander Chepurnov, Koun Choi, Laura Collica, Stefano Davini, Alexander Derbin, XueFeng Ding, Antonio Di Ludovico, Lea Di Noto, Ilia Drachnev, Kirill Fomenko, Andrey Formozov, Davide Franco, Federico Gabriele, Cristiano Galbiati, Michael Gschwender, Chiara Ghiano, Marco Giammarchi, Augusto Goretti, Maxim Gromov, Daniele Guffanti, Caren Hagner, Thibaut Houdy, Ed Hungerford, Aldo Ianni, Andrea Ianni, Anna Jany, Dominik Jeschke, Vladislav Kobychev, Denis Korablev, Gyorgy Korga, Tobias Lachenmaier, Matthias Laubenstein, Evgeny Litvinovich, Francesco Lombardi, Paolo Lombardi, Livia Ludhova, Georgy Lukyanchenko, Liudmila Lukyanchenko, Igor Machulin, Giulio Manuzio, Simone Marcocci, Jelena Maricic, Johann Martyn, Emanuela Meroni, Mikko Meyer, Marcin Misiaszek, Valentina Muratova, Birgit Neumair, Lothar Oberauer, Bjoern Opitz, Vsevolod Orekhov, Fausto Ortica, Marco Pallavicini, Laszlo Papp, Omer Penek, Lidio Pietrofaccia, Nelly Pilipenko, Andrea Pocar, Alessio Porcelli, Georgy Raikov, Gioacchino Ranucci, Alessandro Razeto, Alessandra Re, Mariia Redchuk, Aldo Romani, Nicola Rossi, Sebastian Rottenanger, Stefan Schöenert, Dmitrii Semenov, Mikhail Skorokhvatov, Oleg Smirnov, Albert Sotnikov, Lee F. F. Stokes, Yura Suvorov, Roberto Tartaglia, Gemma Testera, Jan Thurn, Maria Toropova, Evgenii Unzhakov, Alina Vishneva, Bruce Vogelaar, Franz von Feilitzsch, Stefan Weinz, Marcin Wojcik, Michael Wurm, Zachary Yokley, Oleg Zaimidoroga, Sandra Zavatarelli, Kai Zuber, and Grzegorz Zuzel

Subjects
solar neutrinos, neutrino oscillation, Borexino, Elementary particle physics, QC793-793.5
Abstract

Solar neutrinos have played a central role in the discovery of the neutrino oscillation mechanism. They still are proving to be a unique tool to help investigate the fusion reactions that power stars and further probe basic neutrino properties. The Borexino neutrino observatory has been operationally acquiring data at Laboratori Nazionali del Gran Sasso in Italy since 2007. Its main goal is the real-time study of low energy neutrinos (solar or originated elsewhere, such as geo-neutrinos). The latest analysis of experimental data, taken during the so-called Borexino Phase-II (2011-present), will be showcased in this talk—yielding new high-precision, simultaneous wide band flux measurements of the four main solar neutrino components belonging to the “pp„ fusion chain (pp, pep, 7 Be, 8 B), as well as upper limits on the remaining two solar neutrino fluxes (CNO and hep).

Published
2018
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2. Natural Convection and Transport of Background Contamination in the Borexino Neutrino Detector

Author

Valentino Di Marcello, Riccardo Mereu, Aldo Ianni, Nicola Rossi, David Bravo-Berguño, Frank Calaprice, Attilio Di Giacinto, Antonio Di Ludovico, Andrea Ianni, and Lidio Pietrofaccia

Subjects
Physics::Instrumentation and Detectors, Mechanical Engineering
Abstract

The Borexino detector at Gran Sasso National Laboratories (INFN) has obtained extraordinary achievements for solar neutrino and geoneutrino physics during its lifetime. More recently, Borexino has provided the first experimental evidence of the subdominant CNO solar neutrino flux, thanks to an outstanding low background level obtained by means of intense purification campaigns and a continuous improvement of the detector thermal stabilization over the years. In particular, this impressive thermal steadiness has led to a progressive mitigation of the internal convective currents which are responsible for the continuous background contamination of the detector sensitive inner volume. To this purpose, numerical analyses are essential to better comprehend the detector fluid dynamics, the background behavior, and are also important to propose effective countermeasures to further reduce natural convection inside the detector. In this framework, the present work investigates the flow characteristics of the liquid scintillator by means of computational fluid dynamics analyses. In particular, a full 3D model of the Borexino inner vessel is considered in the simulations, addressing the complex nature of the natural convective currents under consideration both in transient and stationary conditions. The calculated flow pattern has been adopted to predict the transport behavior of 210Po, that is fundamental for the independent constraint of 210Bi, the main background constituent affecting CNO measurement. The convection-diffusion analysis demonstrates the applicability of the adopted methodology showing a good agreement between calculation and experimental data.

Published
2022

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