Solar Neutrinos on the beginning of 2017

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Presentation transcript:

Solar Neutrinos on the beginning of 2017 Francesco Vissani LNGS & GSSI Workshop Neutrinos: the quest for a new physics scale, CERN, March 2017

2016 April 19

28 yr 21 yr

solar neutrinos Nuclear physics Astrophysics Astronomy We are especially interested in theoretical particle physics, but, we need to be aware of the links with Nuclear physics Astrophysics Astronomy Experimental physics

radiopurity S.S.M. E.S. metallicity helioseismology solar neutrinos We are especially interested in theoretical particle physics, but, we need to be aware of the links with Nuclear physics Astrophysics Astronomy Experimental physics radiopurity S.S.M. E.S. metallicity Borexino helioseismology

S.S.M. metallicity helioseismology

This cross section (ES) is theoretically clean & allows us to get info on solar neutrino spectrum In scintillators detectors, e- above 150 keV are visible with few % energy resolution. But, direction cannot be seen Background cannot be discriminated: Ultrahigh radio-purity is required

E.S. radiopurity Borexino This cross section (ES) is theoretically clean & allows us to get info on solar neutrino spectrum In scintillators detectors, e- above 150 keV are visible with few % energy resolution. But, direction cannot be seen Background cannot be discriminated: Ultrahigh radio-purity is required Borexino radiopurity

Components of the Flux and their Measurements

Components of the Flux and their Measurements SK and SNO probe 0.02% of SSM n flux

Components of the Flux and their Measurements

Borexino

C.N.O.

A chance to learn how stars work: Study CNO! The pp-cycle has been explored almost completely, excepting the hep branch. The CNO cycle instead, that is the main cycle of the most massive stars and should yield 1-2 % of the solar luminosity, is not explored yet. Its measurement may help us to fix the pending issues of SSM.

Shape of the ES spectrum due to CNO

expectations in 2011 F.L. Villante et al, Phys.Lett. B701 (2011) 336

F.L. Villante et al, Phys.Lett. B701 (2011) 336

F.L. Villante et al, Phys.Lett. B701 (2011) 336

Borexino as it is now (from Wiki)

Work in progress! [e.g., from Drachnev 2016:] … Borexino detector has statistical sensitivity to CNO and pep neutrinos when the dedicated analysis here developed is applied. Central values are 5.2±1.8×106 cm-2s-1 and 1.31±0.35×109 cm-2s-1

The MSW Theory

Speculations on particle physics other light (sterile) neutrinos / shape, NC new oscillations on cosmic scales / low energy data neutrino decay / flavor structure neutrino magnetic moments / solar antinu non-standard interactions / new matter effect axions / energy loss WIMPs in the Sun / solar structure, HE neutrinos CPT violation / compare with nubar data ….

New oscillations on cosmic scales n3 , n3’ n2 , n2’ n1 , n1’ n3+ n3- n2+ n2- n1+ n1- Berezinsky et al, 2002 A motivated model for sterile neutrinos is the mirror model. Ordinary and mirror neutrinos mix and give rise to new oscillations. Potential source of ultra high energy neutrinos. In this model, dark matter can be accounted for in terms of mirror baryons. Not particularly favored, but not excluded, by a straightforward interpretation of SN1987A data.

Other light neutrinos? M. Cirelli et al, Nucl. Phys. B708 (2005) 215

A li’l advert A conference on Neutrinos, with special reference to Solar Neutrinos, will take place on next September. Please come for the latest analyses and news -- CNO and much more! You are all welcome to come and visit the Astroparticle physics center of LNGS, GSSI and L’Aquila U

Remarks for particle physicists The 1st remark is quite general: Whether we want it or not, neutrino astronomy is in our hands A definitive understanding of how the Sun functions was obtained only 3 years ago by Borexino @ Gran Sasso lab The same team is progressing with more goals ahead: We are on the verge of learning on CNO, surprises may occur Do not forget that such topics are of great interest for a very wide audience and not only - Nobel 2002