M. Heine

Neutron-skin thickness from the study of the anti-analog giant dipole resonance

The γ-decay of the anti-analog of the giant dipole resonance (AGDR) to the isobaric analog state has been measured following the p( 124Sn,n) reaction at a beam energy of 600 MeV/nucleon. The energy of the transition was also calculated with state-of-the-art self-consistent relativistic random-phase approximation (RPA) and turned out to be very sensitive to the neutronskin thickness (ΔRpn). By comparing the theoretical results with the measured one, the ΔRpn value for 124Sn was deduced to be 0.21 ± 0.07 fm, which agrees well with the previous results. The present method offers new possibilities for measuring the neutron-skin thicknesses of very exotic isotopes.

Performance of timing resistive plate chambers with relativistic neutrons from 300 to 1500 MeV

A prototype composed of four resistive plate chamber layers has been exposed to quasi-monoenergetic neutrons produced from a deuteron beam of varying energy (300 to 1500 AMeV) in experiment S406 at GSI, Darmstad, Germany. Each layer, with an active area of about 2000 × 500 mm2, is made of modules containing the active gaps, all in multigap construction. Each gap is defined by 0.3 mm nylon mono-filaments positioned between 2.85 mm thick float glass electrodes. The modules are operated in avalanche mode with a non-flammable gas mixture composed of 90% C2H2F4 and 10% SF6. The signals are readout by a pick-up electrode formed by 15 copper strips (per layer), spaced at a pitch of 30 mm, connected at both sides to timing front end electronics. Measurements of the time of flight jitter of neutrons, in the mentioned energy range, point to a contribution of the resistive plate chamber in the order of 150 ps, independent of the neutron energy.

NeuLAND - from double-planes to the demonstrator

K. Boretzky†1, G.D. Alkhazov2, L. Atar3, T. Aumann3,1, C. Beinrucker4, D. Bemmerer5, D. Bertini1, A. Blanco6, C. Caesar3,1, T.E. Cowan5,7, G. Dentinger3, Z. Elekes8, A. Endres4, P. Fonte6, D. Galaviz9, I. Gašparić10, St. Gohl5,7, V.L. Golovtsov2, T. Heftrich4, M. Heil1, M. Heine3, A. Heinz11, M. Holl3, A. Horvat3, A. Horvath12, H. Johansson11, J. Kahlbow3, A. Kelić-Heil1, R. Kissel3, D. Körper1, D. Kresan3, A.G. Krivshich2, V. Kuznetsov2, S. Lindberg11, L. Lopes6, J. Machado9, J. Mayer13, K. Miki3, L. Netterdon13, T. Nilsson11, E.M. Orischin2, S.G. Pickstone13, R. Plag1, M. Pohl4, R. Reifarth4, T.P. Reinhardt7, S. Reinicke5,7, M. Röder5,7, D. Rossi1, H. Scheit3, F. Schindler3, H. Simon1, M. Sobiella5, K. Sonnabend4, D. Stach5, P. Teubig9, R. Thies11, H. Toernqvist3, L.N. Uvarov2, V.V. Vikhrov2, S.S. Volkov2, A. Wagner5, A.A. Zhdanov2, A. Zilges13, K. Zuber7, the RB collaboration , and the FAIR@GSI division1 1GSI, Darmstadt, Germany; 2PNPI St. Petersburg, Russia; 3TU Darmstadt, Germany; 4Univ. Frankfurt, Germany; 5HZDR, Dresden-Rossendorf, Germany; 6LIP, Coimbra, Portugal; 7TU Dresden, Germany; 8MTA ATOMKI, Debrecen, Hungary; 9Univ. Lisbon, Portugal; 10RBI, Zagreb, Croatia; 11Chalmers Univ. of Technology, Göteborg, Sweden; 12Eötvös Univ., Budapest, Hungary; 13Univ. of Cologne, Germany