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Search Results: 1 - 10 of 189976 matches for " G. Fiorentini "
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Nuclear astrophysics and neutrinos
G. Fiorentini
Physics , 1998,
Abstract: In this report, centered on the activities within the MURST-PRIN project "Fisica teorica del nucleo e dei sistemi a pi\`u corpi" we discuss recent advances on the following items: i)neutrinos as probes of the solar interior and of other astrophysical objects; ii)neutrinos as probes of physics beyond the Standard Model of electroweak interactions; iii)the role of nuclear physics in i) and ii); iv) who is doing what within the italian network; v)future projects.
Solar neutrinos (almost) without standard solar models
G. Fiorentini,B. Ricci
Physics , 1995,
Abstract: 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 with solar models, both standard and non standard ones. Finally we discuss the expectations for Borexino, both in the case of standard and non standard neutrinos.
New Trends in Solar-Neutrino Physics
V. Berezinsky,G. Fiorentini
Physics , 1996,
Abstract: 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 talks and to the discussions. There were discussion sessions and short original presentations for each topic as well as the general discussion session at the end of the workshop.
How long does it take for heat to flow through the sun?
G. Fiorentini,B. Ricci
Physics , 1997,
Abstract: 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 time, also reminding its (ir)relevance to the solar neutrino problem.
alpha :a constant that is not a constant?
G. Fiorentini,B. Ricci
Physics , 2002, DOI: 10.1007/10857580_14
Abstract: 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 significant progress in exploring the range of variability suggested by QSO data. We also discuss the effects of a time varying alpha on stellar structure and evolution. We find that radioactive dating of ancient stars can offer a new observational window.
First-principles theoretical evaluation of crystalline zirconia and hafnia as gate oxides for Si microelectronics
V. Fiorentini,G. Gulleri
Physics , 2002, DOI: 10.1103/PhysRevLett.89.266101
Abstract: Parameters determining the performance of the crystalline oxides zirconia (ZrO_2) and hafnia (HfO_2) as gate insulators in nanometric Si electronics are estimated via ab initio calculations of the energetics, dielectric properties, and band alignment of bulk and thin-film oxides on Si (001). With their large dielectric constants, stable and low-formation-energy interfaces, large valence offsets, and reasonable (though not optimal) conduction offsets (electron injection barriers), zirconia and hafnia appear to have a considerable potential as gate oxides for Si electronics.
Helioseismology, solar models and solar neutrinos
G. Fiorentini,B. Ricci
Physics , 1999, DOI: 10.1016/S0920-5632(99)00864-6
Abstract: 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)the accuracy of the helioseismic determination of the sound speed near the solar center; iii)predictions of neutrino fluxes based on helioseismology, (almost) independent of SSMs; iv)helioseismic tests of exotic solar models.
Solar neutrinos: where we are and what is next?
G. Fiorentini,B. Ricci
Physics , 1998,
Abstract: 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 models and predicted solar neutrino fluxes. Finally , we discuss the potential of new experiments for detecting specific signatures of the proposed solutions to the solar neutrino puzzle.
What have we learnt about the Sun from the measurement of the $^8$B neutrino flux?
G. Fiorentini,B. Ricci
Physics , 2001, DOI: 10.1016/S0370-2693(02)01159-0
Abstract: By combining the results of SNO and Super-Kamiokande one can derive - in the absence of sterile neutrinos - the total neutrino flux produced from $^8$B decay in the Sun. We use this information to check the accuracy of several input parameters of solar model calculations. Opacity and p-p fusion cross section are constrained by the $^8$B flux measurement to the level of few per cent. The central solar temperature is determined to the one-percent level. We also find an upper limit for the flux on Earth of sterile neutrinos. We discuss the role of nuclear physics uncertainties on these determinations.
The solar neutrino spectrum derived from electron scattering and charged current interactions
G. Fiorentini,F. L. Villante
Physics , 2001,
Abstract: 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 published Super-Kamiokande data. When combined with data from SNO on charged current interactions this method allows to derive separately the spectra of nu_e and of nu_mu plus nu_tau.
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