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NeuLAND detector of the R 3 B collaboration

This presentation discusses the technical design and goals of NeuLAND, a new large-area neutron detector for kinematically complete measurements of reactions with relativistic radioactive beams available at FAIR. The design features high resolution, large acceptance, and multi-neutron detection capability. The presentation also includes information about the prototype test, construction progress, and future plans.

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NeuLAND detector of the R 3 B collaboration

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  1. NeuLAND detector of the R3B collaboration Igor Gašparić TU Darmstadt/IRB Zagreb AsyEOS workshop, 6.9.2012, Siracusa, Italy

  2. R3B experimental setup • NeuLAND – New Large-Area Neutron Detector • kinematically complete measurements of reactions with relativistic radioactive beams available at FAIR • Pygmy dipole resonances, neutron/proton flow, nuclei beyond the neutron dripline, … AsyEOS workshop, 6.9.2012, Siracusa, Italy

  3. LAND – Large-Area Neutron Detector • used for >20 years • 200 paddles 200x10x10 cm3 of plastic scintillator and passive iron converter • 10 planes x 20 paddles • σt = 250 ps • σx,y,z = 3 cm • efficiency ~95% for energies > 400 MeV AsyEOS workshop, 6.9.2012, Siracusa, Italy

  4. NeuLAND design goals • σt ≤ 150 ps • σx,y,z ≤ 1.5 cm • one-neutron efficiency ~95% for energies 200-1000 MeV • large acceptance (magnet gap ±80 mrad) • multi-neutron detection capability AsyEOS workshop, 6.9.2012, Siracusa, Italy

  5. NeuLAND technical design • finalized in Oct 2011, TDR submitted • total volume 2.5x2.5x3 m3 • 3000 modules (plastic scintilator bars) 250x5x5 cm3 • each bar readout by two PMT • 30 double planes with 100 bars each, bars in neighboring planes mutually perpendicular large acceptance high resolution AsyEOS workshop, 6.9.2012, Siracusa, Italy

  6. NeuLAND time resolution • 500 MeV protons and 31 MeV electron tests • different prototype bars tested (length, cross section, PMTs) • light guide optimized σt = 125 ps AsyEOS workshop, 6.9.2012, Siracusa, Italy

  7. Erel resolution • 132Sn at 600 AMeV • realistic time resolution introduced • resolution of 20 keV for the Erel = 100 keV and long distance available in the future R3B cave AsyEOS workshop, 6.9.2012, Siracusa, Italy

  8. Multi-neutron recognition • simulations (R3BRoot/Geant3) AsyEOS workshop, 6.9.2012, Siracusa, Italy

  9. Readout electronics Tacquila • system containing discriminator, TDC and QDC • developed for FOPI • adjusted for LAND • used in several experiments (AsyEOS in 2011) • 15 ps internal time resolution • during the S412 experiment in May worked properly • ready for the NeuLAND prototype test in Oct 600 MeV 124Sn on CD2 target (781 mg/cm2) ToF (ns) energy (a.u.) AsyEOS workshop, 6.9.2012, Siracusa, Italy

  10. NeuLAND prototype • 200 bars in 2.5x0.5x1 m3 box • all bars vertical to avoid charged particles (next slide) • calibration with cosmics needs some crossing bars • construction in progress … • delivery of the remaining bars in progress … • test with cosmics in progress … AsyEOS workshop, 6.9.2012, Siracusa, Italy

  11. Test experiment Oct/Nov 2012 • deuteron beam on CH2 target at 200, 400, 600, 800, 1050, 1500 AMeV • (p,2p) reaction, protons detected in Crystal Ball and Silicon Strip Detectors - Δφ≈180, Δθ ≈80 • NeuLAND and LAND efficiencies as a function of energy, time resolution, cross-check of the simulations • MRPCs time resolution and efficiency AsyEOS workshop, 6.9.2012, Siracusa, Italy

  12. Summary • technical design of the new neutron detector finalized (TDR submitted in Nov 2011) • according to the performed tests and simulations detector fulfills requirements of the R3B physics program • test with the 200-bar prototype in Oct/Nov 2012 • construction of the NeuLAND starts in 2013 • 20% demonstrator ready for tests and first experiment in Cave C in 2014 AsyEOS workshop, 6.9.2012, Siracusa, Italy

  13. NeuLAND working group Convener: Konstanze Boretzky, GSI Darmstadt, Germany Deputy: Ushasi Datta Pramanik, SINP Kolkata, India Germany GSI Darmstadt: D. Bertini, K. Boretzky, J. Hehner, M. Heil, G. Ickert, Y. Leifels, D. Rossi, H. Simon HZDR Dresden-Rossendorf: D. Bemmerer, T. Cowan, Z. Elekes, M. Kempe, M. Sobiella, D. Stach, A. Wagner, J. Wustenfeld, D. Yakorev TU Darmstadt: T. Aumann, C. Caesar, D. Gonzalez Diaz, A. Ignatov, D. Kresan, H. Scheit TU Dresden: T. Cowan, M. Roder, K. Zuber U Cologne: J. Endres, A. Hennig, V. Maroussov, A. Zilges U Frankfurt: R. Reifarth, M. Volknandt India SINP Kolkata: B. Agrawal, P. Basu, P. Bhattacharya, S. Bhattacharya, S. Chakraborty, S. Chatterjee, U. Datta Pramanik, P. Kumar Das, J. Panja, A. Rahaman, J. Ray, T. Sinha Portugal LIP Coimbra: A. Blanco, P. Fonte, L. Lopez U Lisbon: D. Galaviz Redondo, J. Machado, P. Teubig Romania ISS Bucharest: M. Cherciu, M. Ciobanu, M. Haiduc, M. Potlog, E. Stan Russia Kurchatov Institute Moscow: L. Chulkov PNPI St. Petersburg: G.D. Alkhazov, V.A. Andreev, A.A. Fetisov, V.L. Golovtsov, E.A. Ivanov, A.G. Krivshich, L.N. Uvarov, V.V. Vikhrov, S.S. Volkov, A.A. Zhdanov Sweden Chalmers Univ. of Technology: A. Heinz AsyEOS workshop, 6.9.2012, Siracusa, Italy

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