Publications (74)
Does Solar Physics Provide Constraints to Weakly Interacting Massive Particles?
A. Bottino, G. Fiorentini, N. Fornengo +3
We investigate whether present data on helioseismology and solar neutrino fluxes may constrain WIMP--matter interactions in the range of WIMP parameters under current exploration i…
JUNO Conceptual Design Report
T. Adam, F. An, G. An +347
The Jiangmen Underground Neutrino Observatory (JUNO) is proposed to determine the neutrino mass hierarchy using an underground liquid scintillator detector. It is located 53 km awa…
The MSW solution to the solar neutrino problem for non-standard solar models
V. Berezinsky, G. Fiorentini, M. Lissia
The difficulties for non-standard solar models (NSSM) in resolving the solar neutrino problem are discussed stressing the incompatibility of the gallium--Kamiokande data, and of th…
The reaction, solar neutrinos and the age of the globular clusters
S. Degl'Innocenti, G. Fiorentini, B. Ricci +1
We discuss implications of a new measurement of concerning solar neutrinos, solar models and globular cluster dating. Predictions for the gallium and chlorine…
The cosmological 7Li problem from a nuclear physics perspective
C. Broggini, L. Canton, G. Fiorentini +1
The primordial abundance of 7Li as predicted by Big Bang Nucleosynthesis (BBN) is more than a factor 2 larger than what has been observed in metal-poor halo stars. Herein, we analy…
What have we learnt about the Sun from the measurement of the B neutrino flux?
G. Fiorentini, B. Ricci
By combining the results of SNO and Super-Kamiokande one can derive - in the absence of sterile neutrinos - the total neutrino flux produced from B decay in the Sun. We use thi…
Neutrinos and Energetics of the Earth
G. Fiorentini, F. Mantovani, B. Ricci
We estimate terrestrial antineutrino and neutrino fluxes according to different models of Earth composition. We find large variations, corresponding to uncertainties on the estimat…
Rn contamination mechanisms on acrylic surfaces
M. Nastasi, A. Paonessa, E. Previtali +64
In this work, the Rn contamination mechanisms on acrylic surfaces have been investigated. Rn can represent a significant background source for low-background experi…
Embedded Readout Electronics R&D for the Large PMTs in the JUNO Experiment
M. Bellato, A. Bergnoli, A. Brugnera +91
Jiangmen Underground neutrino Observatory (JUNO) is a next generation liquid scintillator neutrino experiment under construction phase in South China. Thanks to the anti-neutrinos…
Atmospheric neutrino flux and muon data
G. Fiorentini, V. A. Naumov, F. L. Villante
We present a new one-dimensional calculation of low and intermediate energy atmospheric muon and neutrino fluxes, using up-to-date data on primary cosmic rays and hadronic interact…
The anisotropy of inverse beta decay and antineutrino detection
G. Fiorentini, M. Moretti, F. L. Villante
The anisotropy of the positrons emitted in the reaction has to be taken into account for extracting an antineutrino signal in Superkamiokande. For the Sun…
Superkamiokande and solar antineutrinos
G. Fiorentini, M. Moretti, F. L. Villante
We propose to exploit the angular distribution of the positrons emitted in the inverse beta decay to extract a possible antineutrino signal from the Superkamiokande background. Fro…
Heavy element diffusion and globular cluster ages
V. Castellani, F. Ciacio, S. Degl'Innocenti +1
This paper discusses low mass, metal poor stars, presenting new evolutionary computations which take into account the inward diffusion of both He and heavy elements during the H bu…
Physics potentials of pp and pep solar neutrino fluxes
E. Calabresu, G. Fiorentini, M. Lissia
Experimental determinations of the pp and pep fluxes have great potentialities. We briefly review the reasons that make such measurements privileged tests of neutrino properties. W…
How long does it take for heat to flow through the sun?
G. Fiorentini, B. Ricci
This question, which often comes in when discussing solar neutrinos, is not clearly analysed in any textbook, to our knowledge. In this note we give a simple estimate of the flow t…
Fusion rate enhancement due to energy spread of colliding nuclei
G. Fiorentini, C. Rolfs, F. L. Villante +1
Experimental results for sub-barrier nuclear fusion reactions show cross section enhancements with respect to bare nuclei which are generally larger than those expected according t…
Bounds on hep neutrinos
G. Fiorentini, V. Berezinsky, S. Degl'Innocenti +1
The excess of highest energy solar-neutrino events recently observed by Superkamiokande can be in principle explained by anomalously high -neutrino flux . Without…
Neutrinos from San Marco and Below
G. Fiorentini, M. Lissia, F. Mantovani +1
Order of magnitude estimates of radiogenic heat and antineutrino production are given, using the San Marco cathedral as an example. Prospects of determining the radiogenic contribu…
Solar Neutrinos Almost Independently of Solar Models
V. Castellani, S. Degl'Innocenti, G. Fiorentini +1
Recent solar neutrino results together with the assumption of a stationary Sun imply severe constraints on the individual components of the total neutrino flux : $Φ_{Be} \leq 0.7…
Helioseismology and the solar age
W. A. Dziembowski, G. Fiorentini, B. Ricci +1
The problem of measuring the solar age by means of helioseismology hasbeen recently revisited by Guenther & Demarque (1997) and by Weiss & Schlattl (1998). Different best values fo…
A multivariate spatial interpolation of airborne γ-ray data using the geological constraints
E. Guastaldi, M. Baldoncini, G. P. Bezzon +17
In this paper we present maps of K, eU, and eTh abundances of Elba Island (Italy) obtained with a multivariate spatial interpolation of airborne γ-ray data using the constraints o…
Is G a conversion factor or a fundamental unit?
G. Fiorentini, L. Okun, M. Vysotsky
By using fundamental units c, h, G as conversion factors one can easily transform the dimensions of all observables. In particular one can make them all ``geometrical'', or dimensi…
The worldwide NORM production and a fully automated gamma-ray spectrometer for their characterization
G. Xhixha, GP. Bezzon, C. Broggini +14
Materials containing radionuclides of natural origin, which is modified by human made processes and being subject to regulation because of their radioactivity are known as NORM. We…
Helioseismic constraints to the central solar temperature and neutrino fluxes
B. Ricci, V. Berezinsky, S. Degl'Innocenti +2
The central solar temperature T and its uncertainties are calculated in helioseismologically-constrained solar models. From the best fit to the convective radius, density at the co…
Helioseismology, solar models and solar neutrinos
G. Fiorentini, B. Ricci
We review recent advances concerning helioseismology, solar models and solar neutrinos. Particularly we shall address the following points: i) helioseismic tests of recent SSMs; ii…
Stars as galactic neutrino sources
E. Brocato, V. Castellani, S. Degl'Innocenti +2
Theoretical expectations concerning stars as neutrino sources are presented according to detailed evaluations of the stellar evolutionary histories for an extended grid of stellar…
Vacuum oscillations and excess of high energy solar neutrino events observed in Superkamiokande
V. Berezinsky, G. Fiorentini, M. Lissia
The excess of solar-neutrino events above 13 MeV that has been recently observed by Superkamiokande can be explained by the vacuum oscillation solution to the Solar Neutrino Proble…
Nuclear astrophysics and neutrinos
G. Fiorentini
In this report, centered on the activities within the MURST-PRIN project "Fisica teorica del nucleo e dei sistemi a più corpi" we discuss recent advances on the following items: i…
Optimization of the JUNO liquid scintillator composition using a Daya Bay antineutrino detector
Daya Bay, JUNO collaborations, : +646
To maximize the light yield of the liquid scintillator (LS) for the Jiangmen Underground Neutrino Observatory (JUNO), a 20 t LS sample was produced in a pilot plant at Daya Bay. Th…
Helioseismology and p+p d + e + in the sun
S. Degl'Innocenti, G. Fiorentini, B. Ricci
By using a phenomenological field theory of nucleon-nucleon interactions, Oberhummer et al. found a cross section of p+p d + e + about 2.9 times that given by the…
Solar neutrinos (almost) without standard solar models
G. Fiorentini, B. Ricci
We extract information on the fluxes of Be and CNO neutrinos directly from solar neutrino experiments, with minimal assumptions about solar models. Next we compare these results wi…
The fate of Li and Be in stars and in the laboratory
V. Castellani, G. Fiorentini, O. Straniero +1
We connect the observed under-abundances of Li and Be in dwarfs, with recent results on nuclear cross sections at low energies: for collisions of protons with atomic or molecular t…
Helioseismology and solar neutrinos: an update
G. Fiorentini, B. Ricci, F. L. Villante
We review recent advances concerning helioseismology, solar models and solar neutrinos. Particularly we address the following points: i) helioseismic tests of recent SSMs; ii) pred…
alpha :a constant that is not a constant?
G. Fiorentini, B. Ricci
We review the observational information on the constancy of the fine structure constant alpha. We find that small improvements on the measurement of ^{187}Re lifetime can provide s…
Spectroscopy of geo-neutrinos from 2056 days of Borexino data
Borexino collaboration, M. Agostini, S. Appel +99
We report an improved geo-neutrino measurement with Borexino from 2056 days of data taking. The present exposure is protonyr. Assuming a chondrit…
Time-Variation of Newton's Constant and the Age of Globular Clusters
S. Degl'Innocenti, G. Fiorentini, G. G. Raffelt +2
A variation of Newton's constant over cosmological time scales would modify the main-squence time of globular cluster (GC) stars. We have calculated the evolution of low-mass s…
Extreme-ultraviolet optical response of atomically-thin molybdenum disulfide
G. Fiorentini, N. Di Palo, G. Inzani +18
We report multi-angle reflectivity measurements in the extreme-ultraviolet (XUV) range for mono- and bilayer MoS on a SiN substrate. Using a single-sheet 2D conductivit…
Helioseismology and standard solar models
S. Degl'Innocenti, W. A. Dziembowski, G. Fiorentini +1
We present a systematical analysis of uncertainties in the helioseismological determination of quantities characterizing the solar structure. We discuss the effect of errors on the…
Uranium distribution in the Variscan Basement of Northeastern Sardinia
Xhixha M. Kaçeli, M. Albèri, M. Baldoncini +15
We present a detailed map of the uranium distribution and its uncertainties in the Variscan Basement of Northeastern Sardinia (VBNS) at a scale 1:100,000. An area of 2100 km2 was i…
Solar neutrinos: where we are and what is next?
G. Fiorentini, B. Ricci
We summarize the results of solar neutrino experiments and update a solar model independent analysis of solar neutrino data. We discuss the implications of helioseismology on solar…
The Cross Section of 3He(3He,2p)4He measured at Solar Energies
The LUNA Collaboration, M. Junker, A. D'Alessandro +17
We report on the results of the \hethet\ experiment at the underground accelerator facility LUNA (Gran Sasso). For the first time the lowest projectile energies utilized for the cr…
The solar neutrino spectrum derived from electron scattering and charged current interactions
G. Fiorentini, F. L. Villante
We provide a method for extracting information on the energy spectrum of solar neutrinos directly from the spectrum of scattered electrons. As an example, we apply it to the publis…
GIGJ: a crustal gravity model of the Guangdong Province for predicting the geoneutrino signal at the JUNO experiment
M. Reguzzoni, L. Rossi, M. Baldoncini +66
Gravimetric methods are expected to play a decisive role in geophysical modeling of the regional crustal structure applied to geoneutrino studies. GIGJ (GOCE Inversion for Geoneutr…
Neutrino Physics with an Opaque Detector
A. Cabrera, A. Abusleme, J. dos Anjos +59
In 1956 Reines & Cowan discovered the neutrino using a liquid scintillator detector. The neutrinos interacted with the scintillator, producing light that propagated across transpar…
Measurement of geo-neutrinos from 1353 days of Borexino
G. Bellini, J. Benziger, D. Bick +90
We present a measurement of the geo--neutrino signal obtained from 1353 days of data with the Borexino detector at Laboratori Nazionali del Gran Sasso in Italy. With a fiducial exp…
Solar neutrino interactions: Using charged currents at SNO to tell neutral currents at Super-Kamiokande
F. L. Villante, G. Fiorentini, E. Lisi
In the presence of flavor oscillations, muon and tau neutrinos can contribute to the Super-Kamiokande (SK) solar neutrino signal through the neutral current process ν_{μ,Ï} e^{-…
Helioseismic tests of diffusion theory
G. Fiorentini, M. Lissia, B. Ricci
We present a quantitative estimate of the accuracy of the calculated diffusion coefficients, by comparing predictions of solar models with observational data provided by helioseism…
A few comments after the charged current measurement at the Sudbury Neutrino Observatory
G. Fiorentini, F. L. Villante, B. Ricci
The comparison of the SNO charged current result with the solar neutrino signal measured by Super-Kamiokande has provided, for the first time, the evidence of a non electron flavou…
New Trends in Solar-Neutrino Physics
V. Berezinsky, G. Fiorentini
These are the Proceedings of the 4th discussion workshop in the Gran Sasso Laboratory. The structure of this workshop was as before: most of the time was allocated to the review ta…
Intermediate Energy Solar Neutrinos
E. Calabresu, G. Fiorentini, M. Lissia +1
We extract information on the fluxes of Be and CNO neutrinos directly from solar neutrino experiments, with minimal assumptions about solar models. Next we compare these results wi…
A new FSA approach for in situ -ray spectroscopy
A. Caciolli, M. Baldoncini, G. P. Bezzon +14
An increasing demand of environmental radioactivity monitoring comes both from the scientific community and from the society. This requires accurate, reliable and fast response pre…
Just So? Vacuum Oscillations and MSW: An Update
E. Calabresu, N. Ferrari, G. Fiorentini +1
We find that vacuum oscillations (VO), large-mixing-angle and small-mixing-angle MSW solutions to the solar neutrino problem (SNP) give all very good fits to the most recent result…
Mantle geoneutrinos in KamLAND and Borexino
G. Fiorentini, G. L. Fogli, E. Lisi +2
The KamLAND and Borexino experiments have observed, each at ~4 sigma level, signals of electron antineutrinos produced in the decay chains of thorium and uranium in the Earth's cru…
Helioseismology, solar models and neutrino fluxes
V. Castellani, S. Degl'Innocenti, W. A. Dziembowski +2
We present our results concerning a systematical analysis of helioseismic implications on solar structure and neutrino production. We find Y, $R_b/R_\odot=0.708-…
Solar neutrino fluxes with arbitrary He3 mixing
V. Berezinsky, G. Fiorentini, M. Lissia
The He3 abundance is not constrained by helioseismic data. Mixing of He3 inside the solar core by processes not included in the solar standard model (SSM) has been recently propose…
Helioseismology can test the Maxwell-Boltzmann distribution
S. Degl'Innocenti, G. Fiorentini, M. Lissia +2
Nuclear reactions in stars occur between nuclei in the high-energy tail of the energy distribution and are sensitive to possible deviations from the standard equilibrium thermal-en…
Quantifying uncertainties in primordial nucleosynthesis without Monte Carlo simulations
G. Fiorentini, E. Lisi, Subir Sarkar +1
We present a simple method for determining the (correlated) uncertainties of the light element abundances expected from big bang nucleosynthesis, which avoids the need for lengthy…
KamLAND, terrestrial heat sources and neutrino oscillations
G. Fiorentini, T. Lasserre, M. Lissia +2
We comment on the first indication of geo-neutrino events from KamLAND and on the prospects for understanding Earth energetics. Practically all models of terrestrial heat productio…
Helioseismology and screening of nuclear reactions in the Sun
G. Fiorentini, B. Ricci, F. L. Villante
We show that models for screening of nuclear reactions in the Sun can be tested by means of helioseismology. As well known, solar models using the weak screening factors are in agr…
Screening of Nuclear Reactions in the Sun and Solar Neutrinos
B. Ricci, S. Degl'Innocenti, G. Fiorentini
We quantitatively determine the effect and the uncertainty on solar neutrino production arising from the screening process. We present predictions for the solar neutrino fluxes and…
Vacuum oscillations and the distorted solar neutrino spectrum observed by Superkamiokande
V. Berezinsky, G. Fiorentini, M. Lissia
The excess of solar-neutrino events above 13 MeV that has been recently observed by Superkamiokande can be explained by vacuum oscillations (VO). If the boron neutrino flux is 20%…
The Cr neutrino source and Borexino: a desirable marriage
N. Ferrari, G. Fiorentini, B. Ricci
Exposure to a Cr neutrino source as that used in Gallex will provide an excellent overall performance test of Borexino, which should collect about 1400 source induced events…
Charge reconstruction in large-area photomultipliers
M. Grassi, M. Montuschi, M. Baldoncini +60
Large-area PhotoMultiplier Tubes (PMT) allow to efficiently instrument Liquid Scintillator (LS) neutrino detectors, where large target masses are pivotal to compensate for neutrino…
Solar neutrinos: beyond standard solar models
V. Castellani, S. Degl'Innocenti, G. Fiorentini +2
After a short survey of the physics of solar neutrinos, giving an overview of hydrogen burning reactions, predictions of standard solar models and results of solar neutrino experim…
Distillation and stripping pilot plants for the JUNO neutrino detector: design, operations and reliability
P. Lombardi, M. Montuschi, A. Formozov +68
This paper describes the design, construction principles and operations of the distillation and stripping pilot plants tested at the Daya Bay Neutrino Laboratory, with the perspect…
Atmospheric neutrino flux supported by recent muon experiments
G. Fiorentini, V. A. Naumov, F. L. Villante
We present a new one-dimensional calculation of low and intermediate energy atmospheric muon and neutrino fluxes, using up-to-date data on primary cosmic rays and hadronic interact…
Where are the beryllium neutrinos?
S. Degl'Innocenti, G. Fiorentini, M. Lissia
We show that present experiments imply that neutrinos are nonstandard at the 87\% C.L., independently of solar or nuclear physics. Moreover, if neutrinos are standard, the Be f…
Nuclear physics inputs needed for geo-neutrino studies
G. Bellini, G. Fiorentini, A. Ianni +3
Geo-neutrino studies are based on theoretical estimates of geo-neutrino spectra. We propose a method for a direct measurement of the energy distribution of antineutrinos from decay…
U and Th content in the Central Apennines continental crust: a contribution to the determination of the geo-neutrinos flux at LNGS
M. Coltorti, R. Boraso, F. Mantovani +8
The regional contribution to the geo-neutrino signal at Gran Sasso National Laboratory (LNGS) was determined based on a detailed geological, geochemical and geophysical study of th…
Comprehensive geoneutrino analysis with Borexino
M. Agostini, K. Altenmüller, S. Appel +109
This paper presents a geoneutrino measurement using 3262.74 days of data taken with the Borexino detector at LNGS in Italy. By observing $52.6 ^{+9.4}_{-8.6} ({\rm stat}) ^{+2.7}_{…
Which radius for the Sun?
V. Castellani, S. Degl'Innocenti, G. Fiorentini
The high accuracy reached by solar limb observations, by helioseismic measurements and by Standard Solar Models (SSMs) calculations suggests that general relativity corrections are…
Last Hope for an astrophysical solution to the solar neutrino problem
V. Berezinsky, G. Fiorentini, M. Lissia
We discuss what appears the last hope for an astrophysical solution to the solar neutrino problem: a correlated variation of the astrophysical factors for the helium burning cross…
Nuclear reactions in the Sun after SNO and KamLAND
G. Fiorentini, B. Ricci
In this brief review we discuss the possibility of studying the solar interior by means of neutrinos, in the light of the enormous progress of neutrino physics in the last few year…
Solar neutrino with Borexino: results and perspectives
O. Smirnov, G. Bellini, J. Benziger +87
Borexino is a unique detector able to perform measurement of solar neutrinos fluxes in the energy region around 1 MeV or below due to its low level of radioactive background. It wa…