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High-resolution hypernuclear decay pion spectroscopy at MAMI and future
Get PDFHypernuclear decay pion spectroscopy was established in 2012 at MAMI as a mass spectroscopy method for light hypernuclei. A monochromatic pion peak from 4 ΛH was successfully observed, and the Λ binding energy was determined to be BΛ = 2.157±0.005(stat.)±0.077(syst.) MeV in the 2014 run. In 2022, an upgrade experiment for 3 ΛH spectroscopy was conducted using a newly developed Li target. The absolute electron beam energy will be measured by the synchrotron radiation interferometry, which will be applied with the spectrometer calibration to improve the systematic error. The decay pion spectroscopy is planned to be performed at
JLab Hall-C, which would significantly increase the statistics thanks to the higher energy beam, the better K+ identification, and the faster data acquisition system.
This experiment has been submitted as a Letter of Intent in JLab PAC51. The upgraded decay pion spectroscopy method is expected to provide new, accurate hypernuclear data, which will contribute to the advancement of our understanding
of hypernuclear physics
Processo eco-collaborativo per il progetto territorio
No full textIl paper esamina azioni e strumenti, elaborati e messi in opera nell’ambito del progetto di urbanistica partecipata InkCamp e gli esiti quindi raggiunti dalla ricerca (in corso) tesa a sviluppare una analisi di contesto - inteso come insieme di luogo e comunità - per il Comune di Camposano, in provincia di Nola. Le azioni di ingaggio introdotte sono mirate a partecipare alla comunità di Camposano il percorso di redazione del progetto di piano urbanistico comunale (PUC) avviato dall’Amministrazione. Il progetto di urbanistica partecipata InkCamp intende raccogliere la conoscenza esperita - dei luoghi, delle risorse e delle criticità presenti - nonché i bisogni e le visioni delle comunità di abitanti rispetto alla trasformazione del territorio prefigurabile con la redazione del progetto urbanistico.
The paper examines actions and tools, elaborated and implemented in the framework of the InkCamp participatory urban planning project and the outcomes therefore achieved by the research (in progress) aimed at developing a context analysis - understood as a set of place and community - for the Municipality of Camposano, in the province of Nola. The engagement actions introduced are aimed at involving the community of Camposano in the drafting process of the municipal urban plan (PUC) initiated by the Administration. The InkCamp participatory town-planning project intends to gather the experienced knowledge - of the places, resources and criticalities present - as well as the needs and visions of the community of inhabitants with respect to the transformation of the territory prefigured with the drafting of the town-planning project
Investigating the dark sector with the PADME experiment
Get PDFIn the attempt of justifying some unexplained physics phenomena like dark matter nature or the (g − 2)μ anomaly, the existence of new light particles with a wide range of properties has been postulated by several theoretical extensions of the Standard Model. Among the others, a light particle of mass ∼17 MeV (named X17) decaying in e+e− has been put forward to explain an anomaly observed since 2016 in a series of nuclear physics studies performed by the ATOMKI group of Debrecen in Hungary. If confirmed, this new state will represent a real breakthrough in the search of physics phenomena beyond the Standard Model. The PADME
experiment at the Laboratori Nazionali di Frascati of INFN, searching for a dark photon and/or other dark sector candidates among the annihilation products of a beam of positrons on the electrons of a fixed target, has the unique opportunity to confirm/disprove the particle nature of such an anomaly. In the second half of 2022, the collaboration performed a data taking campaign centered at √s ∼17 MeV in
order to produce on-shell the X17. The collected data are under analysis and this paper presents an overview of the PADME results and perspectives
GEANT4 simulation results of the interaction between a thermal neutron beam and a single boron-GEM foil
Get PDFSince 2010, the ensuremath3He crisis has brought the necessity to develop new thermal neutron detectors as an alternative of the tubes based on 3He. A good candidate can be represented by Gas Electron Multiplier (GEM) detector,
which can detect neutrons if coupled with a suitable neutron converter. This work presents the numerical simulations performed with the GEANT4 toolkit, where the interaction of a thermal neutron beam with the single innovative boron GEM
(BGEM) foil has been studied
“Can old quantum theoretical description of physics be rendered coherent?”: A pilot experimentation for high schools
Get PDFWhile many models of the Old Quantum Theory (OQT) have long
been incorporated into international school curricula and textbooks, research in Physics Education regarding effective educational approaches to the OQT is predominantly centred only on individual topics (mainly black-body spectrum, photoelectric effect, and Bohr’s atomic model), leaving a notable lack in providing a coordinated and comprehensive pedagogical, historical, and conceptual presentation that encompasses the entirety of the OQT. The following research questions thus arise: can the OQT be presented coherently and meaningfully without substantial alterations to
prerequisites, topics presented, mathematical formalism, and time usually devoted at school, deepening the physics contents and making it effective from an educational point of view? What are the several disciplinary and learning knots of the OQT? Addressing these research questions, this paper explores the design, implementation, and testing of three extracurricular educational workshops focused on the OQT and conducted in 2022–23 and 2023–24 by the Physics Education research group of the University of Milan, with 210 high-school students and 93 teachers. Meetings included commented readings of original papers, collaborative group works with active understanding, and several qualitative and quantitative assessments and examples. Results obtained are here reported and discussed
The SIDDHARTA-2 experiment for high precision kaonic atoms X-ray spectroscopy at DAΦNE
Get PDFHigh precision X-ray spectroscopy of light kaonic atoms provides valuable information on kaon-nucleus interaction at threshold, allowing to investigate the strong interaction in the strangeness sector at the low-energy frontier. The
SIDDHARTA-2 experiment at the DAΦNE collider of INFN-LNF is performing the challenging measurement of the kaonic deuterium 2p→1s transition which together with the kaonic hydrogen measurement performed by SIDDHARTA, will allow to
extract the isospin-dependent antikaon-nucleon scattering lengths. To achieve this goal, the optimization of the setup to maximize the signal over background ratio is a crucial step. This paper presents the SIDDHARTA-2 experiment and its optimization through the first observation of kaonic neon transitions. The excellent electromagnetic background reduction factor (∼ 104) paves the way not only to the
measurement of kaonic deuterium, but also to a new era of selected kaonic atom measurements along the periodic table
Feasibility of quantum-secure communication in real-world networks
Get PDFIn a world that heavily relies on the secrecy of digital data, the ongoing trend in the development of quantum computers is raising new concerns about the vulnerabilities of the ubiquitous public-key cryptography, which forms the foundation of common banking systems and blockchain technology. While these cryptographic schemes rely on the computational complexity of specific mathematical problems, Quantum Key Distribution (QKD) is claimed to provide unconditionally secure communication “by the laws of physics”. On the other side, QKD’s practical implementation is hindered by the severe decay of the information rates with the distance, which is intrinsic to the same quantum principles it relies on. The question driving this work is whether a real-world network, such as the one constituted by
the Internet fiber infrastructure, might mitigate the rate-distance tradeoff enough to sustain a quantum-encrypted communication between trusted nodes
A new strong-lensing model for the massive galaxy cluster PLCKG287.0+32.9
Get PDFWe present a new high-precision strong lensing model of PLCK
G287.0+32.9, a massive lens galaxy cluster at z = 0.383, based on 153 spectroscopically and photometrically selected member galaxies and 47 secure multiple images of 12 background multiply-lensed sources. The total mass distribution derived from our model shows this cluster to be a very prominent gravitational lens with the third biggest Einstein radius of θE =43.4′′ ± 0.1′′ known to date
Timepix4 calibration and energy resolution evaluation with fluorescence photons
Get PDFThe Timepix4 is a pixelated and hybrid detection system developed by the Medipix4 Collaboration at CERN. It consist of a 448 × 512 pixel reading matrix which can be bump-bonded to a semiconductor sensor with square pixels at a pitch of 55 μm. The Timepix4’s ability to isolate individual particles and measure the energy they release in the sensor makes it a valuable tool for spectral imaging, capable of acquiring continuous energy spectrum images even in the presence of a high rate of incident events. This article presents a calibration method for the Timepix4 and evaluates the device’s energy resolution using fluorescence photons
produced with a micro-focus X-ray tube as a radiation source
Photoluminescent colour centres in lithium fluoride film imaging detectors for monochromatic hard X-rays
Get PDFPassive solid-state detectors based on the optical reading of the visible photoluminescence (PL) emitted by radiation-induced F2 and F+ 3 colour centres in lithium fluoride (LiF) have been successfully tested for X-ray imaging. They are
characterized by high spatial resolution, wide dynamic range, large field of view, non-destructive readout capability, and simplicity of use. Optically-transparent
polycrystalline LiF films of increasing thickness (0.5 and 1.1μm) grown by thermal evaporation on glass and Si(100) substrates were irradiated with monochromatic 7keV X-rays at several doses from 13 to 1.4 × 103Gy at the SOLEIL synchrotron facility. For all the LiF films, the spectrally-integrated visible PL signal intensity was found to depend linearly on the irradiation dose, with films grown on Si(100) substrates exhibiting up to a 50% higher response compared to those grown on glass. The minimum dose of 13 Gy was detected, despite the low thickness of the irradiated
films. A spatial resolution of (0.54 ± 0.02) μm was obtained in edge-enhancement imaging experiments conducted by placing an Au mesh in front of the LiF film detectors