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High-Resolution Time-of-Flight Spectrometer for Fast Neutrons

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 (<100 psec)

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High-Resolution Time-of-Flight Spectrometer for Fast Neutrons

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  1. 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 (<100 psec) - Good spatial resolution (<1 cm in all three dimensions) - High detection efficiency (>90%) - Good neutron recognition / multi-hit capabilities Improving the R3B experimental facility at GSI

  2. The R3B facility @GSI Mixed beam Charged fragments ToF, DE LAND tracking → Br ~ A/Qbg Neutrons ToF, x, y, z ~12 m projectile tracking Photons ALADIN large-acceptance dipole Crystal Ball and Target Beam Excitation energy E*from kinematically complete measurement of all outgoing particles:

  3. The Large Area Neutron Detector LAND Efficiency 1 Resolution:sTof ~ 250 ps sp ~ 5 - 10 MeV/c sIVM ~ 0.2 - 1. MeV Nucl. Instr. Meth. A314 (1992) 136 Neutron Energy (MeV)

  4. 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 (g,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 What ? Why ? How ? Who ?

  5. 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) What ? Why ? How ? Who ?

  6. Collaboration Participants and Expertise GSI KVI Groningen ISS Bucharest Jagellonian University Krakow Universidad Santiago de Compostela CEA Saclay University Frankfurt University Mainz TU Darmstadt University Köln FZ Rossendorf Associated Partners: Saha Institute, Kolkata; Tokyo Institute of Technology What ? Why ? How ? Who ? Collaboration will bring in manpower, laboratory infrastructure, plus all investment costs

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