Download presentation

Presentation is loading. Please wait.

1
Transfer reactions Resonant Elastic scattering Inelastic scattering: GR

2
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)

3
Transfer reactions Beam and B Trajectory Beam B x

4
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

5
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

6
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???

7
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???

8
Inelastic scattering: Giant resonances Plane geometry Cylindric geometry

9
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

Similar presentations

© 2020 SlidePlayer.com Inc.

All rights reserved.

To make this website work, we log user data and share it with processors. To use this website, you must agree to our Privacy Policy, including cookie policy.

Ads by Google