Borexino

Borexino homes in on neutrino oscillations

Borexino homes in on neutrino oscillations (CERN Courier) Experiment at Gran Sasso provides key evidence for the solar-neutrino problem. The mystery of the “missing” solar neutrinos arose in the 1970s when the pioneering experiment by Raymond Davis and colleagues in the Homestake

Apr 06, 2009: Dramatic earthquake hit Abruzzo

On April 6, 2009 at 03:32 a.m. (local time) a strong earthquake (Ml=5.8; Mw= 6.2) hit the town of L’Aquila and its surroundings. As is well known, unfortunately the earthquake had dramatic consequences. There have been over 300 victims, thousands of injured

The Borexino detector at the Laboratori Nazionali del Gran Sasso

The Borexino detector at the Laboratori Nazionali del Gran Sasso NIM-A Volume 600, Issue 3, 11 March 2009, Pages 568-593. doi:10.1016/j.nima.2008.11.076 (local copy; preprint on arXiv) Submitted 24 June 2008, Revised 25 October 2008, Accepted 7 November 2008, Available online

Direct Measurement of the 7Be Solar Neutrino Flux with 192 Days of Borexino Data

Direct Measurement of the 7Be Solar Neutrino Flux with 192 Days of Borexino Data C. Arpesella et al. (Borexino Collaboration) Phys. Rev. Lett. 101, 091302 – Published 29 August 2008 doi:10.1103/PhysRevLett.101.091302 (local copy; preprint on arXiv) Abstract We report the direct measurement of the 7Be

CNGS (CERN to LNGS) neutrino beam (re)started

CNGS, the CERN to LNGS neutrino beam has been (re)started on Jun 18, 2008. Also Borexino may detect some of the neutrinos from the CNGS beam.

Search for solar axions emitted in the M1-transition of 7Li* with Borexino CTF

Search for solar axions emitted in the M1-transition of 7Li* with Borexino CTF G. Bellini, J. Benziger et All (The Borexino Collaboration) The European Physical Journal C Volume 54, issue 1, March 2008, pages 61–72 (Published 29 January 2008) doi:10.1140/epjc/s10052-008-0530-9 (local copy) Abstract Results

Study of PhenylXylylEthane (PXE) as scintillator for low energy neutrino experiments

Study of PhenylXylylEthane (PXE) as scintillator for low energy neutrino experiments NIM-A Volume 585, Issues 1–2, 21 January 2008, Pages 48-60 doi:10.1016/j.nima.2007.10.045 (local copy) Abstract We report on the study of a new liquid scintillator target for neutrino interactions in

Pulse-shape discrimination with the Counting Test Facility

Pulse-shape discrimination with the Counting Test Facility NIM-A Volume 584, Issue 1, 1 January 2008, Pages 98-113 doi: 10.1016/j.nima.2007.09.036 (local copy) Abstract Pulse shape discrimination (PSD) is one of the most distinctive features of liquid scintillators. Since the introduction of

First real time detection of 7Be solar neutrinos by Borexino

First real time detection of 7Be solar neutrinos by Borexino Physics Letters B Volume 658, Issue 4, 3 January 2008, Pages 101-108 doi:10.1016/j.physletb.2007.09.054 Submitted 10 August 2007, Revised 12 September 2007, Accepted 20 September 2007, Available online 5 October 2007 (local

First run with full detector started: Borexino data taking has begun!

Borexino begins data taking on May 16, 2007 at 01:25 CEST

May 15, 2007 11:25 CEST: Borexino filling completed!

2007-05-15 – Inside view of the Borexino detector (camera #1). Borexino filling completed today @ 11:24:55 CEST. SSS is now full of scintillator, we’re almost ready to start the DAQ!

Water Tank filling completed

Water Tank filling completed on May 14, 2007. We’re getting closer…

Response to the critics of Borexino results on electron stability

Response to the critics of Borexino results in “A New experimental limit for the stability of the electron” by H.V. Klapdor-Kleingrothaus, I.V. Krivosheina and I.V. Titkova

Inner Vessel filling completed

PC procurement completed

PC procurement at Sarroch completed Borexino use a solution of PPO (a flour) in PC (pseudocumene, an organic solvent) as its scintillator (active detector mass) and a solution of DMP (a quencher) in the same solvent as a buffer fluid

About 300 m³ of PC in the SSS

Borexino filling goes on: About 300 m³ of PC in the SSS. In the following picture you can see the inside of the Borexino Stainless Steel Sphere as seen from camera #1. The water inside the SSS (and Inner Vessel)

Water Tank filling has begun

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!

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