Geoneutrinos in JUNO: an update

1. Geoneutrinos in JUNO: an update Virginia Strati INFN Ferrara & University of Ferrara JUNO Italia Meeting – Ferrara 9-10 Maggio 2019

2. A roadmap for geoneutrinos in JUNO 9° General Meeting – Zhuhai Feb. 2017 S Strati et al. 2015 PEPS. Analysis of the geoneutrino signal contribution Reconnaissance of geophysical data Identification of the geological reservoirs Characterization of the detector site Reconnaissance of geochemical data Building a 3D reference model Refined estimation of the expected signal from the local crust Ad hoc rock sampling

3. G J

4. Current status of geoneutrinos in JUNO S J G Analysis of the geoneutrino signal contribution G J Reconnaissance of geophysical data Identification of the geological reservoirs Characterization of the detector site Reconnaissance of geochemical data Building a 3D reference model Refined estimation of the expected signal from the local crust Ad hoc rock sampling

5. Why a geological local model is necessary? ? JUNO SLOC + SFFC = signals from local and far field crust estimated using geophysical and geochemical direct measurements JUNO Geophysical & geochemical input Upper Crust Middle Crust Lower Crust

6. Signal contribution vs distance

7. SUMMARY OF MODELS FEATURES

8. THE STUDY AREA JULOC 10°× 10°  ~ 1000 × 1000 km GIGJ 6°× 4°  ~ 500 × 700 km Geoneutrino signal from the crust JULOC ~ 55% GIGJ ~ 50%

9. GEOPHYSICAL INPUT G • Inversion of GOCE gravimetric data • A-priori model including seismic data combined according to their accuracy and spatial resolution • 2D and 1D seismic data, together with Moho depth maps are wisely integrated in a unique and coherent a priori geological model

10. Depth maps of the geophysical discontinuities G SED TUC UC TMC MC TLC LC MD UM

11. Results of geoneutrino signal calculation G GTOT = geoneutrino signal in TNU expected at JUNO produced by U and Th abundances (1µg/g) distributed in UC, MC e LC. • We predicted a reduction (~21%) and an increase (~24%) of the MC and LC signal respectively. • The main outcome of this study is the 63%, 55% and 78% reduction of the UC, MC and LC signal uncertainty.

12. Geochemical model: a controversial point J In JULOC a great portion of the surface is occupied by granites They assign the fraction observed in surface to the full volume up to ~10 km of depth In our model the intrusions occupy a negligible portion of the upper crust volume G

13. Geological map vs geological profile Geological map reports the distribution of rocks on the surface Uppercrust Intrusion The intrusion occupies the 50% of the area y x A geological cross section represents the distribution of rocks in depth Intrusion Uppercrust x The intrusion occupies the 20% of the volume z

14. The “granite effect” on the geoneutrino signal S J S(U+Th) = 39.7 TNU S(U+Th) = 49.1 TNU [Strati et al. 2015] [Gao et al. 2019]

15. Let’s keep the dialogue open and colorful….!