Neu LAND detector of the R 3 B
Neu. LAND detector of the R 3 B collaboration Igor Gašparić TU Darmstadt/IRB Zagreb Asy. EOS workshop, 6. 9. 2012, Siracusa, Italy
R 3 B experimental setup n n n Neu. LAND – 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, … Asy. EOS workshop, 6. 9. 2012, Siracusa, Italy
LAND – Large-Area Neutron Detector n n n used for >20 years 200 paddles 200 x 10 cm 3 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 Me. V Asy. EOS workshop, 6. 9. 2012, Siracusa, Italy
Neu. LAND design goals n n n σt ≤ 150 ps σx, y, z ≤ 1. 5 cm one-neutron efficiency ~95% for energies 200 -1000 Me. V large acceptance (magnet gap ± 80 mrad) multi-neutron detection capability Asy. EOS workshop, 6. 9. 2012, Siracusa, Italy
Neu. LAND technical design n n finalized in Oct 2011, TDR submitted total volume 2. 5 x 3 m 3 3000 modules (plastic scintilator bars) 250 x 5 x 5 cm 3 each bar readout by two PMT 30 double planes with 100 bars each, bars in neighboring planes mutually perpendicular large acceptance high resolution Asy. EOS workshop, 6. 9. 2012, Siracusa, Italy
Neu. LAND time resolution σt = 125 ps n n n 500 Me. V protons and 31 Me. V electron tests different prototype bars tested (length, cross section, PMTs) light guide optimized Asy. EOS workshop, 6. 9. 2012, Siracusa, Italy
Erel resolution n 132 Sn at 600 AMe. V realistic time resolution introduced resolution of 20 ke. V for the Erel = 100 ke. V and long distance available in the future R 3 B cave Asy. EOS workshop, 6. 9. 2012, Siracusa, Italy
Multi-neutron recognition n simulations (R 3 BRoot/Geant 3) Asy. EOS workshop, 6. 9. 2012, Siracusa, Italy
Readout electronics Tacquila n n n system containing discriminator, TDC and QDC developed for FOPI adjusted for LAND used in several experiments (Asy. EOS in 2011) 15 ps internal time resolution during the S 412 experiment in May worked properly ready for the Neu. LAND prototype test in Oct 600 Me. V 124 Sn on CD 2 target (781 mg/cm 2) To. F (ns) n energy (a. u. ) Asy. EOS workshop, 6. 9. 2012, Siracusa, Italy
Neu. LAND prototype n n n 200 bars in 2. 5 x 0. 5 x 1 m 3 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 … Asy. EOS workshop, 6. 9. 2012, Siracusa, Italy
Test experiment Oct/Nov 2012 n n deuteron beam on CH 2 target at 200, 400, 600, 800, 1050, 1500 AMe. V (p, 2 p) reaction, protons detected in Crystal Ball and Silicon Strip Detectors - Δφ≈180 , Δθ ≈80 Neu. LAND and LAND efficiencies as a function of energy, time resolution, cross-check of the simulations MRPCs time resolution and efficiency Asy. EOS workshop, 6. 9. 2012, Siracusa, Italy
Summary n n n 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 R 3 B physics program test with the 200 -bar prototype in Oct/Nov 2012 construction of the Neu. LAND starts in 2013 20% demonstrator ready for tests and first experiment in Cave C in 2014 Asy. EOS workshop, 6. 9. 2012, Siracusa, Italy
Neu. LAND 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. W� ustenfeld, D. Yakorev TU Darmstadt: T. Aumann, C. Caesar, D. Gonzalez Diaz, A. Ignatov, D. Kresan, H. Scheit TU Dresden: T. Cowan, M. R� oder, 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. 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 Asy. EOS workshop, 6. 9. 2012, Siracusa, Italy
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