A. Caminata

Measurement of Solar pp-neutrino flux with Borexino: results and implications

Measurement of the Solar pp-neutrino flux completed the measurement of Solar neutrino fluxes from the pp-chain of reactions in Borexino experiment. The result is in agreement with the prediction of the Standard Solar Model and the MSW/LMA oscillation scenario. A comparison of the total neutrino flux from the Sun with Solar luminosity in photons provides a test of the stability of the Sun on the 10(5) years time scale, and sets a strong limit on the power production by the unknown energy sources in the Sun.

High significance measurement of the terrestrial neutrino flux with the Borexino detector

We review the geoneutrino measurement with Borexino from 2056 days of data taking. 1. Borexino and Geoneutrinos Borexino is an unsegmented massive liquid scintillator detector installed in the Gran Sasso underground Laboratory (Italy). Borexino has been collecting data since May 2007. The active mass in Borexino consists of 280 tons of organic liquid scintillator, pseudocumene (PC; C9H12) with the addition of PPO at 1.5 g/l [1]. The liquid scintillator is contained within a 100 μm thick nylon transparent vessel 4.25 m in radius. 2212 8-inch photomultipliers (PMTs) are installed on a Stainless Steel Sphere (SSS) which contains the liquid scintillator and about 900 tons of pseudocumene buffer with the addition of a light quencher (DMP) [2]. The SSS is built inside a water Cherenkov detector for vetoing muons and muon related events [3]. The water tank also serves as shielding against neutrons from the underground environment. For each event inside the active mass the energy and the time distribution of hit PMTs are measured. Borexino is a high radio purity detector: all materials were carefully selected. A number of purification campaigns were performed to reduce the intrinsic background, namely 238U, 232Th, 210Pb, 210Po, 222Rn and 85Kr. In Borexino calibrations [4] with radioactive sources have been performed. These calibrations allowed to accurately determine the energy scale and to study the uniformity of the light response [5]. Due to the high level of radio purity, Borexino is also an excellent detector for electron anti-neutrinos. These neutrinos are detected by the so-called inverse-beta decay reaction:

The CUORE cryostat: a 10 mK infrastructure for large bolometric arrays

The CUORE experiment is the worlds largest bolometric experiment. The detector consists of an array of 988 TeO 2 crystals, for a total mass of 742 kg. CUORE is presently in data taking at the Laboratori Nazionali del Gran Sasso, Italy, searching for the neutrinoless double beta decay of 130Te. A large custom cryogen-free cryostat allows reaching and maintaining a base temperature of about 10 mK, required for the optimal operation of the detector. This apparatus has been designed in order to guarantee a low noise environment, with minimal contribution to the radioactive background for the experiment. In this paper, we present an overview of the CUORE cryostat, together with a description of all its sub-systems, focusing on the solutions identified to satisfy the stringent requirements. We briefly illustrate the various phases of the cryostat commissioning and highlight the relevant steps and milestones achieved each time. Finally, we describe the successful cooldown of CUORE.

Overview and accomplishments of the Borexino experiment

The Borexino experiment is running at the Laboratori del Gran Sasso in Italy since 2007. Its technical distinctive feature is the unprecedented ultralow background of the inner scintillating core, which is the basis of the outstanding achievements accumulated by the experiment. In this talk, after recalling the main features of the detector, the impressive solar data gathered so far by the experiment will be summarized, with special emphasis to the most recent and prominent result concerning the detection of the fundamental pp solar neutrino flux, which is the direct probe of the engine mechanism powering our star. Such a milestone measurement puts Borexino in the unique situation of being the only experiment able to do solar neutrino spectroscopy over the entire solar spectrum; the counterpart of this peculiar status in the oscillation interpretation of the data is the capability of Borexino alone to perform the full validation across the solar energy range of the MSW-LMA paradigm. The talk will be concluded highlighting the perspectives for the final stage of the solar program of the experiment, centered on the goal to fully complete the solar spectroscopy with the missing piece of the CNO neutrinos. If successful, such a measurement would represent the final crowning of the long quest of Borexino to unravel all the properties of the neutrinos from the Sun.

Neutrino Measurements from the Sun and Earth: Results from Borexino

Important neutrino results came recently from Borexino, a massive, calorimetric liquid scintillator detector installed at the underground Gran Sasso Laboratory. With its unprecedented radiopurity levels achieved in the core of the detection medium, it is the only experiment in operation able to study in real time solar neutrino interactions in the challenging sub-MeV energy region. The recently achieved breakthrough observation of the fundamental pp flux, the precise measurement of the 7Be solar neutrino flux, and the results concerning the pep, 8B and CNO fluxes, together with their physics implications, are described in this work. Moreover, the detector has also provided a clean detection of terrestrial neutrinos, from which they emerge as a new probe of the interior of the Earth.

The CUORE Cryostat

The Cryogenic Underground Observatory for Rare Events (CUORE) is a bolometric experiment for neutrinoless double-beta decay in

CUORE and CUORE-0 experiments

^{130}\hbox {Te}

CNO and pep solar neutrino measurements and perspectives in Borexino

130Te search, currently taking data at the underground facility of Laboratori Nazionali del Gran Sasso (LNGS). The CUORE cryostat successfully cooled down a mass of about 1 ton at