Borexino “Water Tank” filling operations have begun. Ultrapure water in the WT will serve both as a shield against the external natural radioactivity background and as a Cherenkov detector for muon veto. The picture below was taken at the beginning of
PC delivery from Sarroch to LNGS has begun
PC delivery from Sarroch to LNGS has begun. PC (pseudocumene) delivery from the production plant in Sarroch (Sardinia island, Italy) to LNGS has begun. Four special Isotanks will be used for PC transportation. They will go back and forth in
First batch of scintillator (~11,000 liters) in Borexino!
Experimental scintillator purification tests with silica gel chromatography
Experimental scintillator purification tests with silica gel chromatography Ludwig Niedermeier, Christian Grieb, Lothar Oberauer, Gunther Korschinek, Franz von Feilitzsch NIM-A Volume 568, Issue 2, 1 December 2006, Pages 915-922 doi:10.1016/j.nima.2006.08.006 (local copy) Abstract Liquid scintillators used in low counting rate
Borexino SSS filled with water
Another step completed: the Borexino Stainless Steel Sphere (SSS) has been completely filled with ultra-pure water. Next steps: replace the water with buffer liquid and scintillator; filling the Water Tank with ultra-pure water (shield).
CNO and pep neutrino spectroscopy in Borexino: Measurement of the deep-underground production of cosmogenic 11C in an organic liquid scintillator
CNO and pep neutrino spectroscopy in Borexino: Measurement of the deep-underground production of cosmogenic 11C in an organic liquid scintillator H. Back et al. (Borexino Collaboration) Phys. Rev. C 74, 045805 – Published 11 October 2006 doi:10.1103/PhysRevC.74.045805 [local copy, preprint on arXiv:hep-ex/0601035] Abstract Borexino is an experiment
Search for electron antineutrino interactions with the Borexino Counting Test Facility at Gran Sasso
Search for electron antineutrino interactions with the Borexino Counting Test Facility at Gran Sasso The European Physical Journal C – Particles and Fields volume 47, pages21–30 (2006) Published: 19 May 2006 doi:10.1140/epjc/s2006-02560-4 (local copy) Abstract Electron antineutrino interactions above the inverse beta decay energy
Cosmogenic 11C production and sensitivity of organic scintillator detectors to pep and CNO neutrinos
Cosmogenic 11C production and sensitivity of organic scintillator detectors to pep and CNO neutrinos Cristiano Galbiati, Andrea Pocar, Davide Franco, Aldo Ianni, Laura Cadonati, Stefan Schönert Phys. Rev. C 71, 055805 – Published 20 May 2005 doi:10.1103/PhysRevC.71.055805 (local copy) Abstract
The photomultiplier tube testing facility for the Borexino experiment at LNGS
The photomultiplier tube testing facility for the Borexino experiment at LNGS A.Brigatti, A.Ianni, P.Lombardi, G.Ranucci, O.Ju.Smirnov NIM-A Volume 537, Issue 3, Pages 521-536 (2005). doi:10.1016/j.nima.2004.07.248 (local copy) Preprint: arXiv:physics/0406106 Abstract A facility to test the photomultiplier tubes (PMTs) for the
The measurements of 2200 ETL9351 type photomultipliers for the Borexino experiment with the photomultiplier testing facility at LNGS
The measurements of 2200 ETL9351 type photomultipliers for the Borexino experiment with the photomultiplier testing facility at LNGS A.Ianni, P.Lombardi, G.Ranucci, O.Ju.Smirnov NIM-A Volume 537, Issue 3, 1 February 2005, Pages 683-697 doi:10.1016/j.nima.2004.07.249 (local copy) Preprint: arXiv:physics/0406138 Abstract The results of
New experimental limits on violations of the Pauli exclusion principle obtained with the Borexino Counting Test Facility
New experimental limits on violations of the Pauli exclusion principle obtained with the Borexino Counting Test Facility The European Physical Journal C – Particles and Fields volume 37, pages 421–431 (2004) Published: November 2004 doi:10.1140/epjc/s2004-01991-1 (local copy) Abstract The Pauli exclusion principle (PEP) has
A Sampling Board Optimized for Pulse Shape Discrimination in Liquid Scintillator Applications
A Sampling Board Optimized for Pulse Shape Discrimination in Liquid Scintillator Applications G. Ranucci, R. Dossi, P. Inzani, G. Korga, P. Lombardi, E. Meroni, and M. E. Monzani IEEE Transactions on Nuclear Science, vol. 51, no. 4, pp. 1784-1790, Aug.
Radon permeability through nylon at various humidities used in the Borexino experiment
Radon permeability through nylon at various humidities used in the Borexino experiment M. Wójcik, G. Zuzel. NIM-A Volume 524, Issues 1–3, 21 May 2004, Pages 355-365 doi:10.1016/j.nima.2004.01.064 [local copy] Abstract We have investigated the radon permeation through a nylon film
Video: Borexino internal nylon vessels installation
Videos of the Borexino nylon vessels installation (Jan – May, 2004). Here are some time-lapse videos of the whole operation, as seen by Borexino’s internal CCD photo-cameras, mounted on the Stainless Steel Sphere (inside dedicated sealed chambers, with special glass
Nylon vessels installed and inflated
Installation of the two concentric nylon inner vessels of the Borexino detector have been completed. Both vessels have been inflated with ultra-pure, humidified nitrogen gas, which will be eventually replaced by the final liquids.
Precision Measurements of Time Characteristics of ETL9351 Photomultipliers
Precision Measurements of Time Characteristics of ETL9351 Photomultipliers O.Ju.Smirnov, P.Lombardi, G.Ranucci Instruments and Experimental Techniques Volume 47, issue 1, pp. 69–80, January 2004 doi:10.1023/B:INET.0000017255.60520.e0 [local copy] Abstract The measured characteristics of 2200 photomultiplier tubes (PMTs) for the future Borexino experiment
New experimental limits on heavy neutrino mixing in 8B decay obtained with the Prototype of the Borexino Detector
New experimental limits on heavy neutrino mixing in 8B-decay obtained with the Borexino Counting Test Facility Journal of Experimental and Theoretical Physics Letters Volume 78, pages 261–266 (2003) Published: September 2003 doi:10.1134/1.1625721 (local copy) Abstract If heavy neutrinos with mass are emitted
Energy and Spatial Resolution of a Large-Volume Liquid-Scintillator Detector
Energy and Spatial Resolution of a Large-Volume Liquid-Scintillator Detector O. Ju. Smirnov Instruments and Experimental Techniques Vol.46 No.2, 327–344 (2003) doi:10.1023/A:1024458203966 [local copy] Abstract The energy and spatial resolution of a large-volume liquid-scintillator detector has been investigated. The relations have
New limits on nucleon decays into invisible channels with the BOREXINO Counting Test Facility
New limits on nucleon decays into invisible channels with the BOREXINO counting test facility Physics Letters B Volume 563, Issues 1–2, 19 June 2003, Pages 23-34 doi:10.1016/S0370-2693(03)00636-1 [local copy] Abstract The results of background measurements with the second version of
Study of the neutrino electromagnetic properties with the Prototype of the Borexino Detector
Study of neutrino electromagnetic properties with the prototype of the Borexino detector Physics Letters B Volume 563, Issues 1–2, 19 June 2003, Pages 35-47 [local copy] doi:10.1016/S0370-2693(03)00579-3 Abstract The results of background measurements with the prototype of the Borexino detector (CTF)
Search for solar pp neutrinos with an upgrade of CTF detector
The possibility of using ultrapure liquid organic scintillator as a low-energy solar neutrino detector is discussed. The detector can be build at the LNGS underground laboratory as an upgrade of the CTF detector using already developed technologies.
Ultra-traces of 226Ra in nylon used in the Borexino solar neutrino experiment
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.