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Ancillary/Complementary detectors for the AD at LNL

Ancillary/Complementary detectors for the AD at LNL. The magnetic spectrometer PRISMA The heavy-ion detector DANTE The multiplicity filter HELENA. Overview. The PRISMA spectrometer. Formed by a Quadrupole, a Dipole and heavy ion detectors (MCP, MWPPAC, IC) to track the ions.

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Ancillary/Complementary detectors for the AD at LNL

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  1. Ancillary/Complementary detectors for the AD at LNL

  2. The magnetic spectrometer PRISMA The heavy-ion detector DANTE The multiplicity filter HELENA Overview

  3. The PRISMA spectrometer • Formed by a Quadrupole, a Dipole and heavy ion detectors (MCP, MWPPAC, IC) to track the ions. • Identifies the nuclei produced in the reaction (A,Z,β) Spettrometro PRISMA

  4. Optical elements • Quadrupole: a singlet, focuses vertically the ions towards the dispersion plane • Dipole: bends horizontally the ions with respect to their magnetic rigidity (Br)

  5. PRISMA detectors • Entrance Position position xs - ys, time • Focal Plane Position position xf - yf, time • Ionization Chambers energy loss, total energy Physical Event: (xs, ys, xf, yf, TOF, ∆E, E)

  6. The CLARA-PRISMA setup Quadrupole Dipole Start detector X-Y, time 6m (TOF) IC E-ΔE MWPPAC X-Y, time Angular range 0o - +130o ΔΩ = 80 msr ΔZ/Z  1/60 (Measured) ΔA/A  1/190 (Measured) Energy acceptance ±20% Bρ = 1.2 T.m

  7. The DANTE array Detector Array for multi Nucleon Transfer Ejectiles • DANTE (heavy ion detector based on MCP) reveals the position interaction (position resolution 1mm) of the recoils  Doppler correction. • DANTE placed at the grazing angle for binary reactions  γ-γ coincidences MCP (50x70mm) detectors PRISMA CLARA Grazing angle Beam 74° Beam 26°

  8. DANTE in the RC of CLARA

  9. Performance of DANTE Need of a kinematical coincidence Reaction: 64Ni on 238U at 440 MeV, Θgrazing=73o No possible kinematic coincidence (238U → fissions). As a consequence there is a large background

  10. Statistics Performance of DANTE Statistics gamma-gamma Reaction: 70Zn on 238U at 460 MeV, Θgrazing=64o Energy resolution 0.9% Energy resolution 1.2% A. Gottardo, Tesi di Laurea, Universita di Padova

  11. DANTE-CLARA Simulations • Simulations made with GEANT4 using Enrico’s code for the CLARA array • Velocity distribution of the recoils, DANTE does not measure the velocity. • An average velocity of 8% which presents Δβ = 20% gives an ERESOLUTION=2.0% Inelastic channel Velocities measured event-by-event with PRISMA

  12. Milano - LNL DANTE for the AGATA Demonstrator DANTE in the new reaction chamber of AD New delay line made with components • Versatility of DANTE, different configurations Padova-LNL

  13. The ancillary DANTE Detector array for multi-nucleon transfer ejectiles Beam dump PRISMA Ring for DANTE built in Al Low γ absorption B.Million, S. Coelli, A. Gadea INFN-Milano-LNL

  14. 58o 42o 26o 74o 90o The DANTE array Versatility of DANTE Use of different configurations depending on the Grazing angle of the reaction

  15. The ancillary HELENA Multiplicity filter • Helena: 35 hexagonal BaF2 3”x3” detectors • Five ensemble of 7 detectors arranged as a honeycomb • Total solid angle: 57% of 4π (15 cm from target) • Total efficiency: 35% INFN-Milano

  16. The ancillary HELENA Multiplicity filter: Performance High Multiplicity Low Multiplicity Mγ=30 Mγ=5

  17. Summary & Conclusions • PRISMA ancillary detector for AD provides (A,Z,β) • DANTE ancillary detector for AD provides position interaction and average β→ Doppler correction. • HELENA ancillary detector for the AD provides the multiplicity of the event.

  18. The DANTE detectors Configuration of a single detector Thickness:13mm Mylar Linea di ritardo MCP Delay line Lateral section Preamplifier in vacuum

  19. TOF X coordinate Y coordinate Amplitude Test of the DANTE detectors • Test done with an α source • Time resolution 130ps (TAC-ADC) • Position resolution <1mm • High counting rate • High noise rejection

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