Physics Nuclear Physics And Radiation Physics

A Proposal for First-Ever Measurement of Coherent Neutrino-Nucleus Scattering

Authors: Winant, C D Bernstein, A Foxe, M P Hagmann, C A Jovanovic, I Kazkaz, K M Stoeffl, W S
 
Abstract: We propose to build and deploy a 10-kg dual-phase argon ionization detector for the detection of coherent neutrino-nucleus scattering, which is described by the reaction; ν + (Z,N) → ν + (Z,N), where ν is the scattering neutrino, and (Z,N) is the target nucleus of atomic number Z and neutron number N. Its detection would validate central tenets of the Standard Model. We have built a gas-phase argon ionization detector to determine the feasibility of measuring the small recoil energies (~ 1keV) predicted from coherent neutrino scattering, and to characterize the recoil spectrum of the argon nuclei induced by scattering from medium-energy neutrons. We present calibrations made with 55-Fe, a low-energy X-ray source, and report on measurements to date of the recoil spectra from the 2-MeV LINAC Li-target neutron source at LLNL. A high signal-to-noise measurement of the recoil spectrum will not only serve as an important milestone in achieving the sensitivity necessary for measuring coherent neutrino-nucleus scattering, but will break new scientific ground on its own.
Publication Date: 05 Feb 2008
Report numbers: LLNL-TR-401214
DOE Contract number: W-7405-ENG-48
Resource Type: Technical Report
Research Organizations: Lawrence Livermore National Laboratory (LLNL), Livermore, CA
Sponsoring Organizations: USDOE
Country of Publication: United States
Language: English
Keywords relating to this report:
ARGON
ATOMIC NUMBER
DETECTION
IONIZATION
LINEAR ACCELERATORS
NEUTRINOS
NEUTRON SOURCES
NEUTRONS
NUCLEI
SCATTERING
SENSITIVITY
SPECTRA
STANDARD MODEL
TARGETS
X-RAY SOURCES