A. de Bellefon

Pulse-shape discrimination with the counting test facility

Pulse shape discrimination (PSD) is one of the most distinctive features of liquid scintillators. Since the introduction of the scintillation techniques in the field of particle detection, many studies have been carried out to characterize intrinsic properties of the most common liquid scintillator mixtures in this respect. Several application methods and algorithms able to achieve optimum discrimination performances have been developed. However, the vast majority of these studies have been performed on samples of small dimensions. The Counting Test Facility, prototype of the solar neutrino experiment Borexino, as a 4 ton spherical scintillation detector immersed in 1000 tons of shielding water, represents a unique opportunity to extend the small-sample PSD studies to a large-volume setup. Specifically, in this work we consider two different liquid scintillation mixtures employed in CTF, illustrating for both the PSD characterization results obtained either with the processing of the scintillation waveform through the optimum Gattis method, or via a more conventional approach based on the charge content of the scintillation tail. The outcomes of this study, while interesting per se, are also of paramount importance in view of the expected Borexino detector performances, where PSD will be an essential tool in the framework of the background rejection strategy needed to achieve the required sensitivity to the solar neutrino signals.

New limits on nucleon decays into invisible channels with the BOREXINO Counting Test Facility

The results of background measurements with the second version of the BOREXINO Counting Test Facility (CTF-II), installed in the Gran Sasso Underground Laboratory, were used to obtain limits on the instability of nucleons, bounded in nuclei, for decays into invisible channels (

New experimental limits on violations of the Pauli exclusion principle obtained with the Borexino Counting Test Facility

inv

Dark matter search with a low temperature sapphire bolometer

): disappearance, decays to neutrinos, etc. The approach consisted of a search for decays of unstable nuclides resulting from

Resonance formation in the reactions K−p → K+ξ− and K−p → KOξO in the mass region from 1915 to 2168 MeV

N

Measurement of Deep Inelastic Compton Scattering of High-energy Photons

and

Calibration of a Ge crystal with nuclear recoils for the development of a dark matter detector

NN

Measurement ofJ/ψ and ψ′ real photoproduction on lithium-6 at a mean energy of 90 GeV

decays of parents

High energy photoproduction of large transverse-momentum π0 mesons: A quantitative test of QCD

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New data on the reaction K−p→Λπ0 from 1.934 to 2.516 GeV/c and partial-wave analysis for this reaction between 2070 MeV and 2436 MeV CMS energy

C,