Neutrinos

Searching for Neutrinoless Double Beta Decay: New Results from GERDA Phase II

The GERDA experiment searches for neutrinoless double beta (0νββ) decay of 76Ge using high purity germanium (HPGe) detectors operated in liquid argon (LAr). GERDA relies on improved active background reduction techniques such as pulse shape discrimination (PSD). Phase II of the experiment includes a major upgrade: for further background rejection, the LAr cryostat is instrumented to detect argon scintillation light (LAr veto).

Physics Capabilities of the magnetised Iron Calorimeter detector at the India-based Neutrino Observatory

The proposed 50 kTon magnetised Iron Calorimeter (ICAL) detector at the India-based Neutrino Observatory (INO) aims to detect atmospheric neutrinos and study the effect of Earth matter on their propagation and determine neutrino mass hierarchy. In addition to performing standard oscillation studies, ICAL can probe exotic phenomena like neutrino decay. A study of the sensitivity of the 50 kTon to the invisible decay
of the mass eigenstate ν3 is studied. A full three-generation analysis including earth matter

Nonmaximal θ23 mixing at NOvA from neutrino decoherence

In its most recent muon-neutrino disappearance measurement at 810 km, the NOvA experiment observed a deviation from maximal mixing (sin2θ23=0.5) at 2.6σ. This result is in tension with the 295-km baseline measurements of T2K, which are consistent with maximal mixing. We propose that θ23 is in fact maximal, and that the disagreement is a harbinger of environmentally induced decoherence. The departure from maximal mixing can be accounted for by an energy-independent decoherence of strength Γ=(2.3±1.1)×10−23 GeV.

Réunion du GDR Neutrino

Le Groupement de Recherche (GDR2918 CNRS) NEUTRINO fédère les équipes de recherche du CEA et du CNRS travaillant autour de la physique du neutrino que ce soit au niveau expérimental ou théorique.

Le laboratoire APC (Université Paris -Diderot) organise les prochaines réunions plénières du GDR Neutrino. Elles auront lieu le lundi 29 mai 2017 à partir de 14 h et le mardi 30 mai 2017 de 9 h à 18h, dans l’amphithéâtre Turing.

https://indico.in2p3.fr/event/14384/

 

Opportunities in Atmospheric Neutrino Physics

The not-so-small mixing angle theta13 measured at Daya Bay, RENO, and Double Chooz,
stimulated many design activities for next-generation experiments. In this talk, I
will talk about several aspects of the physics potential in atmospheric neutrino
experiment such as ORCA and PINGU, including mass hierarchy and CP measurements.
Their physics potential can be further extended by observing neutrino trident
production with double muon tracks for direct constraint on new physics beyond the

Deep Learning in MicroBooNE

MicroBooNE is a liquid argon Time Projection Chamber (TPC) located in the Booster Neutrino Beam at Fermilab. One of its main goals is to study the >3σ excess observed at low energy (Eν ~ 200-600 MeV) by the MiniBooNE experiment, which was located in the same beam. Two independent analyses are ongoing in MicroBooNE to study this possible excess. One of them uses Deep Learning Convolutional Neural Network (CNN) tools, originally developed for image analysis, to reconstruct and identify particle tracks in the (1-proton, 1-lepton)CCQE neutrino final state topology.

The SoLid experiment

The recent emergence of the Reactor Antineutrino Anomaly has revived the interest in short-baseline experiments probing the disappearance of electron neutrinos and antineutrinos. The SoLid experiment is a reactor project that aims to resolve the anomaly employing a novel detector design. Installed at a very short distance of ∼ 6.0 - 9.0 m from the BR2 research reactor core at SCK·CEN in Belgium, it will be able to scan the allowed parameter region within a year of data taking through the detection of low energy  ̄νe.

A high-resolution CMOS imaging detector for the search of neutrinoless double β decay in 82Se

I will introduce a new technology of detectors for the search of the neutrinoless double β decay of 82Se. Based on the present literature, imaging devices from amorphous 82Se evaporated on a complementary metal-oxide-semiconductor (CMOS) active pixel array are expected to have the energy and spatial resolution to produce two-dimensional images of ionizing tracks of utmost quality, effectively akin to an electronic bubble chamber in the double β decay energy regime.

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