Transfer reactions Resonant Elastic scattering Inelastic scattering: GR
Transfer reactions lab 77 Ni(d,p) 78 Ni at 10 MeV/u cm =1.5, 20, 40° Cell of 50cm length side, cubic or cylindric Beam shield 1cm wide (±5mm)
Transfer reactions Beam and B Trajectory Beam B x
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 E res =E cb -S n +E x Case 77 Ni: E res =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 H 2,D 2 Track length>5cm P≈100mb Charge state fluctuations???
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