arXiv subjects

Giuseppe Salamanna

Publications and source records attributed to Giuseppe Salamanna.

6 recordsLinked to original sources

arXiv2026

A compact Optical Liquid Argon Facility at Roma Tre

In this paper we present a compact test facility for the measurement of optical properties of liquid argon as scintillator. The setup is under preparation at Roma Tre and it has a volume of 40 L liquid argon, which is liquefied from argon gas with a purity of $\ge 99.9999\%$ vol. To readout the scintillation photons from liquid argon with the highest intensity near 127 nm, we use the vacuum ultraviolet silicon photomultipliers from Hamamatsu. By submerging the photon detectors directly inside the liquid argon, we can eliminate the systematics from the wavelength shifter and light guides which have been commonly used to detect the scintillation photons of liquid argon.

physics.ins-det↗

arXiv2019

Research and Development for Near Detector Systems Towards Long Term Evolution of Ultra-precise Long-baseline Neutrino Experiments

With the discovery of non-zero value of $θ_{13}$ mixing angle, the next generation of long-baseline neutrino (LBN) experiments offers the possibility of obtaining statistically significant samples of muon and electron neutrinos and anti-neutrinos with large oscillation effects. In this document we intend to highlight the importance of Near Detector facilities in LBN experiments to both constrain the systematic uncertainties affecting oscillation analyses but also to perform, thanks to their close location, measurements of broad benefit for LBN physics goals. A strong European contribution to these efforts is possible.

physics.ins-det↗

arXiv2018

Solar neutrinos with the JUNO experiment

The JUNO liquid scintillator-based experiment, construction of which is on-going in Jiangmen (China), will start operations in 2020 and will detect anti-neutrinos from nearby reactors; but also solar neutrinos via elastic scattering on electrons. Its physics goals are broad; its primary aim to measure the neutrino mass ordering demands to collect large statistics, which requires JUNO's 20 kt sensitive mass, and achieve an unprecedented energy resolution (3$\%/\sqrt{E}$). Thanks to these characteristics, JUNO is in a very good position to contribute to the solar neutrino studies in the line of previous experiments of similar technology. It will collect a large sample of neutrinos from $^7$Be and $^8$B. In particular, for $^7$Be the target energy resolution will provide a powerful tool to isolate the electron energy end point from backgrounds like $^{210}$Bi and $^{85}$Kr. At the same time, challenges will have to be faced mainly related to the reduction and estimation of the backgrounds. While a thorough LS purification campaign is being planned, the desired level of purification is less aggressive than e.g. in Borexino. Also, cosmogenic backgrounds such as cosmic ray muons traversing the relatively thin layer of ground above JUNO (700 m) and crossing the detector will need to be vetoed with dedicated techniques for the extraction of $^8$B. In my talk I reviewed JUNO's preliminary analysis strategy and challenges in the solar neutrino sector; and provided the current estimates of its solar neutrino and background yields, with related energy spectra, assuming two benchmark scenarios of scintillator radio-purity.

physics.ins-det↗

arXiv2018

Status and physics potential of the JUNO experiment

(On behalf of the JUNO Collaboration) The Jiangmen Underground Neutrino Observatory (JUNO) is an underground 20 kton liquid scintillator detector being built in the south of China and expected to start data taking in 2020. JUNO has a physics programme focused on neutrino properties using electron anti-neutrinos emitted from two near-by nuclear power plants. Its primary aim is to determine the neutrino mass hierarchy from the ${\barν_e}$ oscillation pattern. With an unprecedented relative energy resolution of 3$\%$ as target, JUNO will be able to do so with a statistical significance of 3-4 $σ$ within six years of running. It will also measure other oscillation parameters to an accuracy better than 1$\%$. An ambitious experimental programme is in place to develop and optimize the detector and the calibration system, to maximize the light yield and minimize energy biases. JUNO will also be in a good position to study neutrinos from the sun and the earth and from supernova explosions, as well as provide a large acceptance for the search for proton decay. JUNO's physics potential was described and the status of its construction reviewed in my talk at the conference.

hep-ex↗

arXiv2017

A new way to determine the neutrino mass hierarchy at reactors

The determination of the neutrino mass ordering is currently pursued by several experiments and proposals. A very challenging one is its evaluation from reactor experiments based on the tiny interference effect between the $Δm^2_{31}$ and $Δm^2_{32}$ oscillations. Current analyses require several years of data taking and an extreme energy resolution to achieve anyhow less than 5 $σ$. Referring to the JUNO experimental conditions we developed a completely new technique that would provide a robust 5 $σ$ measurement in less than six years of running. The two orderings could be discriminated at the price of allowing for two different values of $Δm^2_{31}$. This degeneracy on $Δm^2_{31}$ (around $12\times 10^{-5}$ eV$^2$) can however be measured at an unprecedented accuracy of much less than 1\%, i.e. $10^{-5}$ eV$^2$, within the same analysis. Analogies with the usual $χ^2$ analysis, where the $Δm^2_{31}$ degeneracy is much more important, are discussed. Evaluation and inclusion of systematic errors and backgrounds have been performed, the most relevant among them being the addition of the two remote reactor plants 250 km away. Baselines of each contributing reactor core and its spatial resolution have been taken into account. Possible results after two years of running and the foreseen initially-reduced available reactor power have been studied, too. These results confirm the very positive perspectives for JUNO to determine the mass ordering in a vacuum-oscillation dominated region.

hep-ph↗

arXiv2013

Measurement of the top quark mass with the ATLAS detector

An overview is presented of the measurements of the top quark mass performed by the ATLAS experiment at the LHC with an integrated luminosity varying between 35 pb$^{-1}$ and 4.7 fb$^{-1}$. Different techniques are used to measure the top quark mass looking at events in all three signatures: fully-hadronic, lepton+jets and di-leptonic ones. The most precise measurement, using a template method on lepton+jets events, yields a top quark mass of 174.5 $\pm$ 0.6 (stat) $\pm$ 2.3 (syst) GeV. The dominant systematic uncertainties are related to the determination of the $b-$jet energy scale and the modelling of additional radiation accompanying the $t\bar{t}$ pair production.

hep-ex↗