high-resolution time-of-flight spectrometer for fast neutrons
DESCRIPTION
What ? Why ? How ? Who ?. Letter of Intent. High-Resolution Time-of-Flight Spectrometer for Fast Neutrons. JRA - Proposal: Development of a next-generation detection system for high-energy neutron Performance goals: - Very good time-of-flight resolution (TRANSCRIPT
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High-Resolution Time-of-Flight Spectrometer for Fast Neutrons
JRA - Proposal:
Development of a next-generation detection system for high-energy neutron
Performance goals:
- Very good time-of-flight resolution (<100 psec)
- Good spatial resolution (<1 cm in all three dimensions)
- High detection efficiency (>90%)
- Good neutron recognition / multi-hit capabilities
Letter of Intent What ?
Why ?
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Who ?
Improving the R3B experimental facility at GSI
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The R3B facility @GSI
Excitation energy E* from kinematically complete measurement of all outgoing particles:
Neutrons
ToF, E
LANDtracking → BA/Q
Charged fragments
PhotonsALADINlarge-acceptance dipole
ToF, x, y, z
Crystal Ball and TargetBeam
projectiletracking
~12 m
Mixed beam
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The Large Area Neutron Detector LAND
Nucl. Instr. Meth. A314 (1992) 136
Resolution:
Tof ~ 250 ps p
~ 5 - 10 MeV/c
IVM ~ 0.2 - 1. MeV
Efficiency1
Neutron Energy (MeV)
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Physics Motivation
A large number of physics programs (and users) will benefit (fragmentation beams, reaccelerated beams, >50 A MeV)
Some experiments critically depend on the improved performance
- Inelastic excitation of radioactive nuclei elm excitation, multipole response, new collective modes
- Quasi-free scattering in particular (p,pn) reactions, n detector at 45 degree → resolution !!! single-particle structure, nucleon-nucleon correlations, in-medium effects
- Astrophysical reaction rates (,n) cross sections at very low excitation energy → resolution !!!
- Nuclear states beyond the driplines e.g. multi-neutron clusters → multi-hit recognition capability !!!
- The asymmetry energy and the nuclear/neutron Equation of State pygmy dipole, n-skin, neutron flow measurements ...
- Kinematical complete measurements of fission and spallation reactions
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Research and Development Program
Idea: Converter principle plus RPC – based charged particle detection (modular detector, >10000 channels, >100 m2 RPC) RPCs have been used for detection of minimum-ionizing light charged particles Time resolution in the order of 50 psec has been reached
Activities:
• Understanding of the reaction mechanisms/hadronic shower properties and their
simulation• Simulation of possible detector concepts and their optimization• Study of detections principles, alternatives to converter/charged-particle principle• Detection of low-energy charged particles with RPCs (efficiency, resolution)• Development of prototype modules and tests• Development of a cost-effective readout scheme providing excellent time
resolution
Final deliverable: Prototype (20% detector)
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Collaboration
Participants and Expertise
GSIKVI GroningenISS BucharestJagellonian University KrakowUniversidad Santiago de CompostelaCEA SaclayUniversity FrankfurtUniversity MainzTU DarmstadtUniversity KölnFZ Rossendorf
Associated Partners: Saha Institute, Kolkata; Tokyo Institute of Technology
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Collaboration will bring in manpower, laboratory infrastructure, plus all investment costs