skip to main content

SciTech ConnectSciTech Connect

Title: Cosmogenic Backgrounds in Borexino at 3800 m water-equivalent depth

The solar neutrino experiment Borexino, which is located in the Gran Sasso underground laboratories, is in a unique position to study muon-induced backgrounds in an organic liquid scintillator. In this study, a large sample of cosmic muons is identified and tracked by a muon veto detector external to the liquid scintillator, and by the specific light patterns observed when muons cross the scintillator volume. The yield of muon-induced neutrons is found to be Y{sub n} = (3.10±0.11)·10{sup −4} n/(μ·(g/cm{sup 2})). The distance profile between the parent muon track and the neutron capture point has the average value λ = (81.5±2.7) cm. Additionally the yields of a number of cosmogenic radioisotopes are measured for {sup 12}N, {sup 12}B, {sup 8}He, {sup 9}C, {sup 9}Li, {sup 8}B, {sup 6}He, {sup 8}Li, {sup 11}Be, {sup 10}C and {sup 11}C. All results are compared with Monte Carlo simulation predictions using the FLUKA and GEANT4 packages. General agreement between data and simulation is observed for the cosmogenic production yields with a few exceptions, the most prominent case being {sup 11}C yield for which both codes return about 50% lower values. The predicted μ-n distance profile and the neutron multiplicity distribution are found to be overallmore » consistent with data.« less
Authors:
; ; ;  [1] ;  [2] ;  [3] ; ; ;  [4] ;  [5] ;  [6] ; ; ;  [7] ;  [8] ; ;  [9] ;  [10] ;  [11] ;  [12] more »; « less
  1. Dipartimento di Fisica, Università degli Studi e INFN, Milano 20133 (Italy)
  2. Chemical Engineering Department, Princeton University, Princeton, NJ 08544 (United States)
  3. University of Hamburg, Hamburg (Germany)
  4. INFN Laboratori Nazionali del Gran Sasso, Assergi 67010 (Italy)
  5. Physics Department, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061 (United States)
  6. Physics Department, University of Massachusetts, Amherst 01003 (United States)
  7. Physics Department, Princeton University, Princeton, NJ 08544 (United States)
  8. Lomonosov Moscow State University Skobeltsyn Institute of Nuclear Physics, Moscow 119234 (Russian Federation)
  9. Department of Physics, University of Houston, Houston, TX 77204 (United States)
  10. St. Petersburg Nuclear Physics Institute, Gatchina 188350 (Russian Federation)
  11. NRC Kurchatov Institute, Moscow 123182 (Russian Federation)
  12. APC, Univ. Paris Diderot, CNRS/IN2P3, CEA/Irfu, Obs. de Paris, Sorbonne Paris Cité (France)
Publication Date:
OSTI Identifier:
22282741
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Cosmology and Astroparticle Physics; Journal Volume: 2013; Journal Issue: 08; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; BERYLLIUM 11; BORON 8; CARBON 10; CARBON 11; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; G CODES; HELIUM 8; LIQUID SCINTILLATION DETECTORS; LITHIUM 9; MONTE CARLO METHOD; MULTIPLICITY; NEUTRINO DETECTION; NEUTRON REACTIONS; NEUTRONS; NITROGEN 12; SOLAR NEUTRINOS; UNDERGROUND