Survey
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
* Your assessment is very important for improving the workof artificial intelligence, which forms the content of this project
Transfer reactions Resonant Elastic scattering Inelastic scattering: GR Transfer reactions 77Ni(d,p)78Ni at 10 MeV/u qcm=1.5, 20, 40° Cell of 50cm length side, cubic or cylindric Beam shield 1cm wide (±5mm) qlab Transfer reactions Beam Beam and B x Trajectory B q Beam Transfer reactions Conclusions -Forward angles most difficult -Better energy resolution obtained with cubic geometry and B But -Deviation of the beam -trajectories crossing the beam Best design: cylindric detector with B parallel to the beam and longitudinal projection Resonant Elastic scattering Eres=Ecb-Sn+Ex Case 77Ni: Eres=5MeV Typical energy range to cover: 4 to 9 MeV Resonant Elastic scattering For angles below 10°, energy resolution dominated by the position resolution at the reaction place MAYA geometry: reaction place determined by projection on anode plane. Limitation to between ±45°. Loss of solid angle (factor 2 or 4). Cylindric geometry: position determined by time resolution. Problem also at small angles: for 5°, with interstrip=2mm, resolution ≈ 1mm. Problem with increase of rise time??? Inelastic scattering: Giant resonances Very low energy recoil Particles =>no impurities Pure gases H2,D2 Track length>5cm P≈100mb Charge state fluctuations??? Inelastic scattering: Giant resonances Plane geometry Cylindric geometry Conclusions — Large dynamics needed: 0.2-20 MeV — Either magnetic field or ancillary detectors (many) — Energy resolution: 50 keV for Si detectors =>10% at 0.5 MeV, 0.5% at 5 MeV Position resolution 0.25mm =>2.5% for 1cm, 0.25% for 10cm —Cubic geometry : Problem with deflection of the beam in with B Solid angle reduced by factor 2(4) —Cylindric geometry: Problem at small angles (ancillary detectors below 5°) Varying rise times of the pulses