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 exposure of (3.69 ± 0.16) × 1031 proton × year after all selection cuts and background subtraction, we detected (14.3 ± 4.4) geo-neutrino events assuming a fixed chondritic mass Th/U ratio of 3.9. This corresponds to a geo-neutrino signal Sgeo = (38.8 ± 12.0) TNU with just a 6 × 10−6 probability for a null geo-neutrino measurement. With U and Th left as free parameters in the fit, the relative signals are STh = (10.6 ± 12.7) TNU and SU = (26.5 ± 19.5) TNU. Borexino data alone are compatible with a mantle geo--neutrino signal of (15.4 ± 12.3) TNU, while a combined analysis with the KamLAND data allows to extract a mantle signal of (14.1 ± 8.1) TNU. Our measurement of a reactor anti--neutrino signal Sreact = 84.5+19.3−18.9 TNU is in agreement with expectations in the presence of neutrino oscillations.

Measurement of geo-neutrinos from 1353 days of Borexino

FIORENTINI, Giovanni;MANTOVANI, Fabio;RICCI, Barbara;
2013

Abstract

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 exposure of (3.69 ± 0.16) × 1031 proton × year after all selection cuts and background subtraction, we detected (14.3 ± 4.4) geo-neutrino events assuming a fixed chondritic mass Th/U ratio of 3.9. This corresponds to a geo-neutrino signal Sgeo = (38.8 ± 12.0) TNU with just a 6 × 10−6 probability for a null geo-neutrino measurement. With U and Th left as free parameters in the fit, the relative signals are STh = (10.6 ± 12.7) TNU and SU = (26.5 ± 19.5) TNU. Borexino data alone are compatible with a mantle geo--neutrino signal of (15.4 ± 12.3) TNU, while a combined analysis with the KamLAND data allows to extract a mantle signal of (14.1 ± 8.1) TNU. Our measurement of a reactor anti--neutrino signal Sreact = 84.5+19.3−18.9 TNU is in agreement with expectations in the presence of neutrino oscillations.
2013
G., Bellinia; J., Benzigerb; D., Bickc; G., Bonnid; D., Bravoe; M., Buizza Avanzinif; B., Caccianigaa; L., Cadonatig; F., Calapriceh; P., Cavalcanted; A., Chavarriah; A., Chepurnovi; D., D'Angeloa; S., Davinij; A., Derbink; A., Emplj; A., Etenkol; Fiorentini, Giovanni; K., Fomenkon; D., Francof; C., Galbiatih; S., Gazzanad; C., Ghianof; M., Giammarchia; M., Goeger Neo; A., Gorettih; L., Grandih; C., Hagnerc; E., Hungerfordj; Aldo, Iannid; Andrea, Iannih; V. V., Kobychevp; D., Korablevn; G., Korgaj; Y., Koshiod; D., Krynf; M., Laubensteind; T., Lewkeo; E., Litvinovichl; B., Loerh; P., Lombardia; F., Lombardid; L., Ludhovaa; G., Lukyanchenkol; I., Machulinl; S., Maneckie; W., Maneschgq; Mantovani, Fabio; G., Manuzior; Q., Meindlo; E., Meronia; L., Miramontia; M., Misiaszeks; P., Mosteiroh; V., Muratovak; L., Oberauero; M., Obolenskyf; F., Orticat; K., Otisg; M., Pallavicinir; L., Pappe; L., Perassor; S., Perassor; A., Pocarg; G., Ranuccia; A., Razetod; A., Rea; Ricci, Barbara; A., Romanit; N., Rossid; A., Sabelnikovl; R., Saldanhah; C., Salvor; S., Schonertq; H., Simgenq; M., Skorokhvatovl; O., Smirnovn; A., Sotnikovn; S., Sukhotinl; Y., Suvorovu; L, ; R., Tartagliad; G., Testerar; D., Vignaudf; R. B., Vogelaare; F., von Feilitzscho; J., Wintero; M., Wojciks; A., Wrighth; M., Wurmc; J., Xuh; O., Zaimidorogan; S., Zavatarellir; G., Zuzelq
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11392/1786699
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