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Title: Reactor antineutrino directionality measurement with the PROSPECT-I detector

Journal Article · · Physical Review. D.
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  1. Illinois Institute of Technology, Chicago, IL (United States); PROSPECT Collaboration. et al.
  2. University of Wisconsin
  3. Le Moyne College
  4. Illinois Institute of Technology
  5. Lawrence Livermore National Laboratory
  6. Oak Ridge National Laboratory
  7. United States Naval Academy
  8. Drexel University
  9. Georgia Institute of Technology
  10. Oak Ridge National Laboratory; University of Tennessee
  11. Brookhaven National Laboratory
  12. Boston University
  13. Susquehanna University
  14. Yale University
  15. Temple University
  16. University of Hawaii
  17. National Institute of Standards and Technology

The PROSPECT-I detector has several features that enable measurement of the direction of a compact neutrino source. Here, in this paper, a detailed report on the directional measurements made on electron antineutrinos emitted from the High Flux Isotope Reactor is presented. With an estimated true neutrino (reactor to detector) direction of φ = 40.8° ± 0.7° and θ= 98.6° ± 0.4°, the PROSPECT-I detector is able to reconstruct an average neutrino direction of φ = 39.4° ± 2.9° and θ = 97.6° ± 1.6°. This measurement is made with approximately 48 000 Inverse Beta Decay signal events and is the most precise directional reconstruction of reactor antineutrinos to date.

Research Organization:
Brookhaven National Laboratory (BNL), Upton, NY (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States); Univ. of Hawaii, Honolulu, HI (United States)
Sponsoring Organization:
Heising-Simons Foundation; USDOE Laboratory Directed Research and Development (LDRD) Program; USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
PROSPECT Collaboration
Grant/Contract Number:
AC05-00OR22725; AC52-07NA27344; SC0008347; SC0010504; SC0012704; SC0016060; SC0016357; SC0017660; SC0017815
OSTI ID:
2525848
Report Number(s):
BNL--227632-2025-JAAM; LLNL--JRNL-865585
Journal Information:
Physical Review. D., Journal Name: Physical Review. D. Journal Issue: 3 Vol. 111; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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