CUORICINO is an array of 62 TeO2 bolometers with a total mass of 40.7 kg (11.2 kg of 130Te), operated at about 10 mK to search for ββ(0ν) of 130Te. The detectors are organized as a 14-story tower and intended as a slightly modified version of one of the 19 towers of the CUORE project, a proposed tightly packed array of 988 TeO2 bolometers (741 kg of total mass of TeO2) for ultralow-background searches on neutrinoless double-beta decay, cold dark matter, solar axions, and rare nuclear decays. Started in April 2003 at the Laboratori Nazionali del Gran Sasso (LNGS), CUORICINO data taking was stopped in November 2003 to repair the readout wiring system of the 62 bolometers. Restarted in spring 2004, CUORICINO is presently the most sensitive running experiment on neutrinoless double-beta decay. No evidence for ββ(0ν) decay has been found so far and a new lower limit, T
≥ 1.8 × 1024 yr (90% C.L.), is set, corresponding to 〈m
ν〉 ≤ 0.2–1.1 eV, depending on the theoretical nuclear matrix elements used in the analysis. Detector performance, operational procedures, and background analysis results are reviewed. The expected performance and sensitivity of CUORE is also discussed.
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[Show abstract][Hide abstract] ABSTRACT: This article is a summary of four introductory lectures on ``Neutrino Experiments,'' given at the 2006 TASI summer school. The purposes were to sketch out the present questions in neutrino physics and to discuss the experimental challenges in addressing them. This article concentrates on specific, illustrative examples rather than providing a complete overview of the field of neutrino physics. These lectures were meant to lay the ground-work for the talks which followed on specific, selected topics in neutrino physics.
[Show abstract][Hide abstract] ABSTRACT: The NEMO3 detector is mainly devoted to the search for the neutrinoless
double beta decay (0νββ). The detector is located in the
Fréjus underground laboratory, where it operates since February
2003. The detector contains several isotopes, the most abundant are
100Mo (~7 kg) and 82Se (~1 kg). Up to now no
evidence for 0νββ decay has been observed. The
corresponding limits at 90% C.L. for the half-life are
T1/20ν>5.8×1023 years for
T1/20ν>2.1×1023 years for
82Se. The half-lives of the two-neutrino double-beta decay
(2νββ) for 100Mo, 82Se,
116Cd, 150Nd, 96Zr and 48Ca
are also presented in this paper.
[Show abstract][Hide abstract] ABSTRACT: Renormalization group (RG) evolution of the neutrino mass matrix may take the value of the mixing angle theta13 very close to zero, or make it vanish. On the other hand, starting from theta13=0 at the high scale it may be possible to generate a nonzero theta13, radiatively. In the most general scenario with nonvanishing CP violating Dirac and Majorana phases, we explore the evolution in the vicinity of theta13=0, in terms of its structure in the complex Ue3 plane. This allows us to explain the apparent singularity in the evolution of the Dirac CP phase delta at theta13=0. We also introduce a formalism for calculating the RG evolution of neutrino parameters that uses the Jarlskog invariant and naturally avoids this singular behavior. We find that the parameters need to be extremely fine-tuned in order to get exactly vanishing theta13 during evolution. For the class of neutrino mass models with theta13=0 at the high scale, we calculate the extent to which RG evolution can generate a nonzero theta13, when the low energy effective theory is the standard model or its minimal supersymmetric extension. We find correlated constraints on theta13, the lightest neutrino mass m0, the effective Majorana mass mee measured in the neutrinoless double beta decay, and the supersymmetric parameter tanf beta.