Method to measure the surface and bulk activities of 226Ra in thin nylon foils to be used in Borexino, based on high-sensitivity 222Rn emanation detection, taking advantage of strongly enhanced nylon permeability in the presence of water.
A multiplexed optical-fiber system for the PMT calibration of the Borexino experiment
We illustrate the PMT calibration system design for the Borexino experiment and the results of various feasibility tests performed.
Search for neutrino radiative decay with a prototype Borexino detector
Borexino prototype (CTF) results were used to obtain bounds on the lifetime of radiative neutrino decay. New lower limit is more than an order of magnitude stronger than the previous ones.
Measurements of extremely low radioactivity levels in BOREXINO
Measurements of extremely low radioactivity levels in BOREXINO. New low-level detection limits for isotopes of interest are obtained.
Effects of absorption and reemission of photons in large scintillation counters on the quantities measured by an observing phototubes
Effects of absorption and reemission of photons in large scintillation counters on the quantities measured by an observing phototubes.
Setting of the Predefined Multiplier Gain of a Photomultiplier
Method for setting the predefined gain of a photomultiplier with high precision and minimal operator participation, used for Borexino.
Search for electron decay mode e –› γ + ν with prototype of Borexino detector
Search for electron decay mode e→γ+ν with prototype of Borexino detector Physics Letters B Volume 525, Issues 1–2, 17 January 2002, Pages 29-40 doi:10.1016/S0370-2693(01)01440-X (local copy) Abstract The prototype of the Borexino detector Counting Test Facility, located in the Gran-Sasso
Science and technology of Borexino: a real-time detector for low energy solar neutrinos
The design of Borexino, the various facilities essential to its operation, its spectroscopic and background suppression capabilities and a prognosis of the impact of its results towards resolving the solar neutrino problem. Borexino will also address several other frontier questions in particle physics, astrophysics and geophysics.
Video: CTF2 filling
CTF2 filling (May 22 – Jun 18, 2001), time-lapse video from the CTF internal CCTV camera (consider the effects from reflection and refraction as the water level approaches and gets over the position of the camera).
Borexino at Neutrino 2000 (proceedings)
Borexino – proceedings of the XIX International Conference on Neutrino Physics and Astrophysics, Sudbury, Canada, June 16 – 21, 2000
Methods for precise photoelectron counting with photomultipliers
Measurements has been performed on a THORN EMI 9351 phototube in order to investigate its response to a low light intensity. Precise procedures to determine the intensity of the incident photon flux have been developed and compared. The data show that the various approaches give consistent and reliable results, thus allowing the precise calibration of the device for applications of photon counting.
Radon diffusion through polymer membranes used in the solar neutrino experiment Borexino
Radon diffusion through polymer membranes used in the solar neutrino experiment Borexino M. Wójcik, W. Wlazlo, G. Zuzel and G. Heusser. NIM-A Volume 449, Issues 1–2, 2000, Pages 158-171. ISSN 0168-9002 doi:10.1016/S0168-9002(99)01450-3 [local copy] Abstract We have measured the radon
Light propagation in a large volume liquid scintillator
Fluorescence light propagation in a large volume liquid scintillators detector. Effects of the fluor and solvent. Rayleigh scattering. Comparison of model vs. data in Borexino prototype (CTF).
An analytical approach to the description of absorption and reemission effects in large scintillation counters
An analytical approach to the description of absorption and reemission effects in large scintillation counters Gioacchino Ranucci Nuclear Instruments and Methods – A Volume 440, Issue 2, 1 February 2000, Pages 388-396 – ISSN 0168-9002 doi:10.1016/S0168-9002(99)00927-4 [local copy] Abstract It
A Scintillator Purification System for a Large Scale Solar Neutrino Experiment
A Scintillator Purification System for a Large Scale Solar Neutrino Experiment J. Benziger, M. Johnson, F. P. Calaprice, M. Chen, N. Darnton, F. Loeser and R.B. Vogelaar. Nuclear Instruments and Methods – A Volume 417, Issues 2–3, 11 November 1998,
How Borexino will stare at the Sun
How Borexino will stare at the Sun CERN Courier, 23 September 1998 A new ultra-sensitive experiment to detect solar neutrinos is being built underground in Italy. As construction at the Gran Sasso laboratory nears completion, Gianpaolo Bellini explains how the
A Rn-222 Source for Low-background Liquid Scintillation Detectors
A Rn-222 Source for Low-background Liquid Scintillation Detectors M. Johnson, J. Benziger, C. Stoia, F. P. Calaprice, M. Chen, N. Darnton, F. Loeser and R.B. Vogelaar. Nuclear Instruments and Methods – A Volume 414, Issues 2–3, 11 September 1998, Pages
Pulse shape discrimination of liquid scintillators
Results of different techniques applied to characterize experimentally the pulse shape discrimination capability of liquid scintillators.
A neural network approach to spatial reconstruction in the CTF detector
A neural network approach to spatial reconstruction in the CTF detector G.Alimonti and S.Magni. Nuclear Instruments and Methods – A Volume 411, Issues 2–3, 11 July 1998, Pages 467-474 doi:10.1016/S0168-9002(98)00295-2 [local copy] Abstract Artificial neural networks may in some cases
A large-scale low-background liquid scintillation detector: the Counting Test Facility at Gran Sasso
A large-scale low-background liquid scintillation detector: the Counting Test Facility at Gran Sasso Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Volume 406, Issue 3, 11 April 1998, Pages 411-426 doi:10.1016/S0168-9002(98)00018-7 [local copy] Abstract
Measurement of the 14C abundance in a low-background liquid scintillator
Measurement of the 14C abundance in a low-background liquid scintillator Physics Letters B Volume 422, Issues 1–4, 12 March 1998, Pages 349-358 doi:10.1016/S0370-2693(97)01565-7 [local copy] Abstract The 14C/12C ratio in 4.8 m3 of high-purity liquid scintillator was measured at (1.94±0.09)×10−18, the lowest 14C
Ultra-low background measurements in a large volume underground detector
CTF achieved records in the domain of ultra-low background, large volume detectors. These encouraging results point towards the feasibility of detectors like Borexino.
Measuring the Global Radioactivity in the Earth by Multidetector Antineutrino Spectroscopy
Bearing directly on the interior of the whole Earth, such data can test, for the first time, the conceptual foundations of the geophysical structure, dynamics, and evolution of the present Earth.
The water purification system for the low background Counting Test Facility of the Borexino experiment at Gran Sasso
The water purification system for the low background counting test facility of the Borexino experiment at Gran Sasso M. Balata, L. Cadonati, M. Laubenstein, G. Heusser, M.G. Giammarchi, R. Scardaoni, V. Torri, G. Cecchet, A. de Bari, A. Perotti Nuclear
Solar Neutrinos — From Puzzle to Paradox
Solar Neutrinos — From Puzzle to Paradox R. S. Raghavan SCIENCE Vol. 267, Issue 5194, pp. 45-51 (Jan 6, 1995) doi:10.1126/science.267.5194.45 Abstract The solar neutrino puzzle is deepening into a paradox that refutes the basic logic of the reaction chain