Large Scale Testing and Development of Gadolinium Trichloride for Use in Neutron Detection in Large Water
Water Cherenkov detectors have been used for many years as inexpensive, effective detectors for neutrino interactions and nucleon decay searches. While many important measurements have been made with these detectors a major drawback has been their inability to detect the absorption of thermal neutrons. We believe an inexpensive, effective technique could be developed to overcome this situation via the addition to water of a solute with a large neutron cross section and energetic gamma daughters which would make neutrons detectable. Gadolinium seems an excellent candidate especially since in recent years it has become very inexpensive, now less than $8 per kilogram in the form of commercially-available gadolinium trichloride, GdCl{sub 3}. This non-toxic, non-reactive substance is highly soluble in water. Neutron capture on gadolinium yields a gamma cascade which would be easily seen in detectors like Super-Kamiokande. We have begun to investigate the use of GdCl{sub 3} as a possible upgrade for the Super-Kamiokande detector with a view toward improving its performance as a detector for atmospheric neutrinos, supernova neutrinos, wrong-sign solar neutrinos, reactor neutrinos, proton decay, and also as a target for the coming T2K long-baseline neutrino experiment. This large-scale investigation, conducted in the one kiloton water Cherenkov detector built for the K2K long-baseline experiment, follows up on highly promising benchtop-scale work previously carried out with the assistance of a 2003 Advanced Detector Research Program grant.
- Research Organization:
- The Regents of the University of California, Irvine
- Sponsoring Organization:
- USDOE - Office of Energy Research (ER)
- DOE Contract Number:
- FG02-05ER41386
- OSTI ID:
- 915115
- Report Number(s):
- DOE/ER/41386; TRN: US1001280
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ABSORPTION
CAPTURE
CHERENKOV COUNTERS
CROSS SECTIONS
DECAY
GADOLINIUM
GAMMA CASCADES
NEUTRINOS
NEUTRON DETECTION
NEUTRON REACTIONS
NEUTRONS
NUCLEONS
PROTONS
RESEARCH PROGRAMS
SOLAR NEUTRINOS
SOLUTES
TARGETS
TESTING
THERMAL NEUTRONS