skip to main content


Title: The aCORN backscatter-suppressed beta spectrometer

Backscatter of electrons from a beta detector, with incomplete energy deposition, can lead to undesirable effects in many types of experiments. We present and discuss the design and operation of a backscatter-suppressed beta spectrometer that was developed as part of a program to measure the electron–antineutrino correlation coefficient in neutron beta decay (aCORN). An array of backscatter veto detectors surrounds a plastic scintillator beta energy detector. The spectrometer contains an axial magnetic field gradient, so electrons are efficiently admitted but have a low probability for escaping back through the entrance after backscattering. Lastly, the design, construction, calibration, and performance of the spectrometer are discussed.
 [1] ;  [2] ;  [3] ;  [1] ;  [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [2] ;  [2] ;  [5] ;  [5] ;  [1] ;  [1] ;  [1]
  1. Tulane Univ., New Orleans, LA (United States). Dept. of Physics and Engineering Physics
  2. National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)
  3. Hamilton College, Clinton, NY (United States). Physics Dept.
  4. DePauw Univ., Greencastle, IN (United States). Dept. of Physics and Astronomy
  5. Indiana Univ., Bloomington, IN (United States). Center for Exploration of Energy and Matter (CEEM)
Publication Date:
Report Number(s):
Journal ID: ISSN 0168-9002
Grant/Contract Number:
AC52-06NA25396; SC0014148; SC0005925; AI02-93ER40784
Accepted Manuscript
Journal Name:
Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment
Additional Journal Information:
Journal Volume: 867; Journal Issue: C; Journal ID: ISSN 0168-9002
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Office of Science (SC); National Science Foundation (NSF); National Institute of Standards and Technology (NIST)
Country of Publication:
United States
46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; Electron spectroscopy; Scintillation detectors; Conversion electrons; Neutron decay; Electron backscatter
OSTI Identifier: