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Combining TIGRESS with charged-particle detection at ISAC-II

Combining TIGRESS with charged-particle detection at ISAC-II. Fred Sarazin Matt Porter-Peden Luke Erikson Colorado School of Mines. ISAC-II @ TRIUMF. ISAC-II @ TRIUMF. Measured. Predicted. (Courtesy: Bob Laxdal / Gordon Ball – TRIUMF). TIGRESS.

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Combining TIGRESS with charged-particle detection at ISAC-II

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  1. Combining TIGRESS with charged-particle detection at ISAC-II Fred Sarazin Matt Porter-Peden Luke Erikson Colorado School of Mines

  2. ISAC-II @ TRIUMF

  3. ISAC-II @ TRIUMF Measured Predicted (Courtesy: Bob Laxdal / Gordon Ball – TRIUMF)

  4. TIGRESS TRIUMF-ISAC Gamma-Ray Escape-Suppressed Spectrometer 12 HPGe clovers array with BGO shields, each clover made of four ~40% n-type HPGe crystals close-packed. 32-fold segmentation of the outer contacts provide position resolution.

  5. TIARA @ GANIL A compact Si array • Charged-particle tagging for Coulex/Transfer • Channel selection, either basic or advanced • Energy levels obtained from g-ray measurements in coincidence.

  6. Example: 11Be(d,p)12Be* 1- 2.7 0+ 2.24 2+ 2.1 0+ 0 12Be Courtesy: Ritu Kanungo, TRIUMF

  7. TIARA Simulation is not the real thing, but… Requiring Vamos FP Plastic Geant4 Simulation 24Ne(d,p)25Ne Vamos+Exogam GATE ON GAMMA COINCIDENCE REMOVES GROUND STATE Courtesy: Wilton Catford, Surrey

  8. Designing the silicon barrel with Geant4 • Charged-particle Array (TIARA-like design): • Octagonal Barrel • 8 silicon strip detectors (Pads) • Each silicon strip detector: 8 resistive strips • Two “layers”: DE (300 mm) & E (1mm)  Identification • Forward/Backward detectors • LEDA detectors – 300 mm • Other detectors: CDs, TIARA-type annular detectors, … Phase 1: Requirement: Dq≤2º & Dj ≤ 5º

  9. Guelph Workshop – March’05 • Funded through Univ. York (UK) • Resistive Strips VS DSSSDs? • Electronics [CFI grant, R.Austin] • Need to reduce costs  “Double barrel” Configuration with DSSSDs Transfer Reactions Phase 2: Coulex: Transfer: Target holder Coulex PCB

  10. CSM Workshop – Feb’06 (I) • Where to put the PCB, connectors, etc…? Phase 2b:

  11. CSM Workshop – Feb’06 (II) • Barrel  Box • Larger W • Front DE-E • 160mm DE • 1.5mm E • Highly segmented • DSSSD: 24+48=72 • Barrel: 592 • CD: 160 • Total: 752 channels Phase 3:

  12. Angular resolution Requirement:Dq≤2º & Dj≤5º Average:Dq=1.6º & Dj=3.5º

  13. Sample Sims – 25Na(d,p) @ 4.5A MeV Kinematics Angular Distribution Forward box DE-E

  14. Chamber design Bambino Chamber – LLNL/Rochester • TIGRESS front lampshade open  Space available • Clockwise/Anticlockwise spirals  Cable paths Very preliminary design

  15. TIARA 0º detector while waiting for EMMA? • Rationale: • No DE-E backward hemisphere • How to get rid of fusion-evaporation contribution? • Solution: • beamlike recoil identification @ 0º Without 0º detection With 0º detection (VAMOS) (Courtesy: Wilton Catford)

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